Update USB_FLASH_DRIVE_SUPPORT (#15021)

Marlin/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

Marlin/src/sd/usb_flashdrive/Sd2Card_FlashDrive.cpp

@@ -22,12 +22,75 @@
 
 #include "../../inc/MarlinConfigPre.h"
 
+/**
+ * Adjust USB_DEBUG to select debugging verbosity.
+ *    0 - no debug messages
+ *    1 - basic insertion/removal messages
+ *    2 - show USB state transitions
+ *    3 - perform block range checking
+ *    4 - print each block access
+ */
+#define USB_DEBUG         1
+#define USB_STARTUP_DELAY 0
+
+// uncomment to get 'printf' console debugging. NOT FOR UNO!
+//#define HOST_DEBUG(...)     {char s[255]; sprintf(s,__VA_ARGS__); SERIAL_ECHOLNPAIR("UHS:",s);}
+//#define BS_HOST_DEBUG(...)  {char s[255]; sprintf(s,__VA_ARGS__); SERIAL_ECHOLNPAIR("UHS:",s);}
+//#define MAX_HOST_DEBUG(...) {char s[255]; sprintf(s,__VA_ARGS__); SERIAL_ECHOLNPAIR("UHS:",s);}
+
 #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
 
+#include "../../Marlin.h"
 #include "../../core/serial.h"
+#include "../../module/temperature.h"
 
-#include "lib/Usb.h"
+static_assert(USB_CS_PIN   != -1, "USB_CS_PIN must be defined");
-#include "lib/masstorage.h"
+static_assert(USB_INTR_PIN != -1, "USB_INTR_PIN must be defined");
+
+#if ENABLED(USE_UHS3_USB)
+  #define NO_AUTO_SPEED
+  #define UHS_MAX3421E_SPD 8000000 >> SPI_SPEED
+  #define UHS_DEVICE_WINDOWS_USB_SPEC_VIOLATION_DESCRIPTOR_DEVICE 1
+  #define UHS_HOST_MAX_INTERFACE_DRIVERS 2
+  #define MASS_MAX_SUPPORTED_LUN 1
+  #define USB_HOST_SERIAL MYSERIAL0
+
+  // Workaround for certain issues with UHS3
+  #define SKIP_PAGE3F // Required for IOGEAR media adapter
+  #define USB_NO_TEST_UNIT_READY // Required for removable media adapter
+  #define USB_HOST_MANUAL_POLL // Optimization to shut off IRQ automatically
+
+  // Workarounds for keeping Marlin's watchdog timer from barking...
+  void marlin_yield() {
+    thermalManager.manage_heater();
+  }
+  #define SYSTEM_OR_SPECIAL_YIELD(...) marlin_yield();
+  #define delay(x) safe_delay(x)
+
+  #define LOAD_USB_HOST_SYSTEM
+  #define LOAD_USB_HOST_SHIELD
+  #define LOAD_UHS_BULK_STORAGE
+
+  #define MARLIN_UHS_WRITE_SS(v) WRITE(USB_CS_PIN, v)
+  #define MARLIN_UHS_READ_IRQ()  READ(USB_INTR_PIN)
+
+  #include "lib-uhs3/UHS_host/UHS_host.h"
+
+  MAX3421E_HOST usb(USB_CS_PIN, USB_INTR_PIN);
+  UHS_Bulk_Storage bulk(&usb);
+
+  #define UHS_START  (usb.Init() == 0)
+  #define UHS_STATE(state) UHS_USB_HOST_STATE_##state
+#else
+  #include "lib-uhs2/Usb.h"
+  #include "lib-uhs2/masstorage.h"
+
+  USB usb;
+  BulkOnly bulk(&usb);
+
+  #define UHS_START usb.start()
+  #define UHS_STATE(state) USB_STATE_##state
+#endif
 
 #include "Sd2Card_FlashDrive.h"
 
@@ -35,10 +98,41 @@
   #include "../../lcd/ultralcd.h"
 #endif
 
-USB usb;
+static enum {
-BulkOnly bulk(&usb);
+  UNINITIALIZED,
+  DO_STARTUP,
+  WAIT_FOR_DEVICE,
+  WAIT_FOR_LUN,
+  MEDIA_READY,
+  MEDIA_ERROR
+} state;
 
-Sd2Card::state_t Sd2Card::state;
+#if USB_DEBUG >= 3
+  uint32_t lun0_capacity;
+#endif
+
+bool Sd2Card::usbStartup() {
+  if (state <= DO_STARTUP) {
+    SERIAL_ECHOPGM("Starting USB host...");
+    if (!UHS_START) {
+      SERIAL_ECHOLNPGM(" failed.");
+      #if EITHER(ULTRA_LCD, EXTENSIBLE_UI)
+        LCD_MESSAGEPGM("USB start failed");
+      #endif
+      return false;
+    }
+
+    // SPI quick test - check revision register
+    switch (usb.regRd(rREVISION)) {
+      case 0x01: SERIAL_ECHOLNPGM("rev.01 started"); break;
+      case 0x12: SERIAL_ECHOLNPGM("rev.02 started"); break;
+      case 0x13: SERIAL_ECHOLNPGM("rev.03 started"); break;
+      default:   SERIAL_ECHOLNPGM("started. rev unknown."); break;
+    }
+    state = WAIT_FOR_DEVICE;
+  }
+  return true;
+}
 
 // The USB library needs to be called periodically to detect USB thumbdrive
 // insertion and removals. Call this idle() function periodically to allow
@@ -46,75 +140,145 @@ Sd2Card::state_t Sd2Card::state;
 // of initializing the USB library for the first time.
 
 void Sd2Card::idle() {
-  static uint32_t next_retry;
+  usb.Task();
+
+  const uint8_t task_state = usb.getUsbTaskState();
+
+  #if USB_DEBUG >= 2
+    if (state > DO_STARTUP) {
+      static uint8_t laststate = 232;
+      if (task_state != laststate) {
+        laststate = task_state;
+        #define UHS_USB_DEBUG(x) case UHS_STATE(x): SERIAL_ECHOLNPGM(#x); break
+        switch (task_state) {
+          UHS_USB_DEBUG(IDLE);
+          UHS_USB_DEBUG(RESET_DEVICE);
+          UHS_USB_DEBUG(RESET_NOT_COMPLETE);
+          UHS_USB_DEBUG(DEBOUNCE);
+          UHS_USB_DEBUG(DEBOUNCE_NOT_COMPLETE);
+          UHS_USB_DEBUG(WAIT_SOF);
+          UHS_USB_DEBUG(ERROR);
+          UHS_USB_DEBUG(CONFIGURING);
+          UHS_USB_DEBUG(CONFIGURING_DONE);
+          UHS_USB_DEBUG(RUNNING);
+          default:
+            SERIAL_ECHOLNPAIR("UHS_USB_HOST_STATE: ", task_state);
+            break;
+        }
+      }
+    }
+  #endif
+
+  static millis_t next_state_ms = millis();
+
+  #define GOTO_STATE_AFTER_DELAY(STATE, DELAY) do{ state = STATE; next_state_ms  = millis() + DELAY; }while(0)
+
+  if (ELAPSED(millis(), next_state_ms)) {
+    GOTO_STATE_AFTER_DELAY(state, 250); // Default delay
 
     switch (state) {
-    case USB_HOST_DELAY_INIT:
-      next_retry = millis() + 2000;
-      state = USB_HOST_WAITING;
-      break;
-    case USB_HOST_WAITING:
-      if (ELAPSED(millis(), next_retry)) {
-        next_retry = millis() + 2000;
-        state = USB_HOST_UNINITIALIZED;
-      }
-      break;
-    case USB_HOST_UNINITIALIZED:
-      SERIAL_ECHOPGM("Starting USB host...");
-      if (!usb.start()) {
-        SERIAL_ECHOPGM(" Failed. Retrying in 2s.");
-        #if HAS_DISPLAY
-          LCD_MESSAGEPGM("USB start failed");
-        #endif
-        state = USB_HOST_DELAY_INIT;
-      }
-      else
-        state = USB_HOST_INITIALIZED;
-      SERIAL_EOL();
-      break;
-    case USB_HOST_INITIALIZED:
-      const uint8_t lastUsbTaskState = usb.getUsbTaskState();
-      usb.Task();
-      const uint8_t newUsbTaskState  = usb.getUsbTaskState();
 
-      if (lastUsbTaskState == USB_STATE_RUNNING && newUsbTaskState != USB_STATE_RUNNING) {
+      case UNINITIALIZED:
-        // the user pulled the flash drive. Make sure the bulk storage driver releases the address
+        #ifndef MANUAL_USB_STARTUP
-        #ifdef USB_DEBUG
+          GOTO_STATE_AFTER_DELAY( DO_STARTUP, USB_STARTUP_DELAY );
-          SERIAL_ECHOLNPGM("USB drive removed");
         #endif
-        //bulk.Release();
+        break;
-      }
+
-      if (lastUsbTaskState != USB_STATE_RUNNING && newUsbTaskState == USB_STATE_RUNNING) {
+      case DO_STARTUP: usbStartup(); break;
-        #ifdef USB_DEBUG
+
-          SERIAL_ECHOLNPGM("USB drive inserted");
+      case WAIT_FOR_DEVICE:
+        if (task_state == UHS_STATE(RUNNING)) {
+          #if USB_DEBUG >= 1
+            SERIAL_ECHOLNPGM("USB device inserted");
           #endif
+          GOTO_STATE_AFTER_DELAY( WAIT_FOR_LUN, 250 );
         }
         break;
+
+      case WAIT_FOR_LUN:
+        /* USB device is inserted, but if it is an SD card,
+         * adapter it may not have an SD card in it yet. */
+        if (bulk.LUNIsGood(0)) {
+          #if USB_DEBUG >= 1
+            SERIAL_ECHOLNPGM("LUN is good");
+          #endif
+          GOTO_STATE_AFTER_DELAY( MEDIA_READY, 100 );
+        }
+        else {
+          #ifdef USB_HOST_MANUAL_POLL
+            // Make sure we catch disconnect events
+            usb.busprobe();
+            usb.VBUS_changed();
+          #endif
+          #if USB_DEBUG >= 1
+            SERIAL_ECHOLNPGM("Waiting for media");
+          #endif
+          #if EITHER(ULTRA_LCD, EXTENSIBLE_UI)
+            LCD_MESSAGEPGM("Waiting for media");
+          #endif
+          GOTO_STATE_AFTER_DELAY(state, 2000);
+        }
+        break;
+
+      case MEDIA_READY: break;
+      case MEDIA_ERROR: break;
+    }
+
+    if (state > WAIT_FOR_DEVICE && task_state != UHS_STATE(RUNNING)) {
+      // Handle device removal events
+      #if USB_DEBUG >= 1
+        SERIAL_ECHOLNPGM("USB device removed");
+      #endif
+      #if EITHER(ULTRA_LCD, EXTENSIBLE_UI)
+        if (state != MEDIA_READY)
+          LCD_MESSAGEPGM("USB device removed");
+      #endif
+      GOTO_STATE_AFTER_DELAY( WAIT_FOR_DEVICE, 0 );
+    }
+
+    else if (state > WAIT_FOR_LUN && !bulk.LUNIsGood(0)) {
+      // Handle media removal events
+      #if USB_DEBUG >= 1
+        SERIAL_ECHOLNPGM("Media removed");
+      #endif
+      #if EITHER(ULTRA_LCD, EXTENSIBLE_UI)
+        LCD_MESSAGEPGM("Media removed");
+      #endif
+      GOTO_STATE_AFTER_DELAY( WAIT_FOR_DEVICE, 0 );
+    }
+
+    else if (task_state == UHS_STATE(ERROR)) {
+        #if EITHER(ULTRA_LCD, EXTENSIBLE_UI)
+          LCD_MESSAGEPGM("Media read error");
+        #endif
+        GOTO_STATE_AFTER_DELAY( MEDIA_ERROR, 0 );
+    }
   }
 }
 
 // Marlin calls this function to check whether an USB drive is inserted.
 // This is equivalent to polling the SD_DETECT when using SD cards.
 bool Sd2Card::isInserted() {
-  return usb.getUsbTaskState() == USB_STATE_RUNNING;
+  return state == MEDIA_READY;
+}
+
+bool Sd2Card::ready() {
+  return state > DO_STARTUP;
 }
 
 // Marlin calls this to initialize an SD card once it is inserted.
-bool Sd2Card::init(const uint8_t sckRateID/*=0*/, const pin_t chipSelectPin/*=SD_CHIP_SELECT_PIN*/) {
+bool Sd2Card::init(const uint8_t, const pin_t) {
-  if (!ready()) return false;
+  if (!isInserted()) return false;
-
-  if (!bulk.LUNIsGood(0)) {
-    SERIAL_ECHOLNPGM("LUN zero is not good");
-    return false;
-  }
 
+  #if USB_DEBUG >= 1
   const uint32_t sectorSize = bulk.GetSectorSize(0);
   if (sectorSize != 512) {
     SERIAL_ECHOLNPAIR("Expecting sector size of 512. Got: ", sectorSize);
     return false;
   }
+  #endif
 
-  #ifdef USB_DEBUG
+  #if USB_DEBUG >= 3
     lun0_capacity = bulk.GetCapacity(0);
     SERIAL_ECHOLNPAIR("LUN Capacity (in blocks): ", lun0_capacity);
   #endif
@@ -123,8 +287,8 @@ bool Sd2Card::init(const uint8_t sckRateID/*=0*/, const pin_t chipSelectPin/*=SD
 
 // Returns the capacity of the card in blocks.
 uint32_t Sd2Card::cardSize() {
-  if (!ready()) return 0;
+  if (!isInserted()) return false;
-  #ifndef USB_DEBUG
+  #if USB_DEBUG < 3
     const uint32_t
   #endif
       lun0_capacity = bulk.GetCapacity(0);
@@ -132,13 +296,13 @@ uint32_t Sd2Card::cardSize() {
 }
 
 bool Sd2Card::readBlock(uint32_t block, uint8_t* dst) {
-  if (!ready()) return false;
+  if (!isInserted()) return false;
-  #ifdef USB_DEBUG
+  #if USB_DEBUG >= 3
     if (block >= lun0_capacity) {
       SERIAL_ECHOLNPAIR("Attempt to read past end of LUN: ", block);
       return false;
     }
-    #if USB_DEBUG > 1
+    #if USB_DEBUG >= 4
       SERIAL_ECHOLNPAIR("Read block ", block);
     #endif
   #endif
@@ -146,13 +310,13 @@ bool Sd2Card::readBlock(uint32_t block, uint8_t* dst) {
 }
 
 bool Sd2Card::writeBlock(uint32_t block, const uint8_t* src) {
-  if (!ready()) return false;
+  if (!isInserted()) return false;
-  #ifdef USB_DEBUG
+  #if USB_DEBUG >= 3
     if (block >= lun0_capacity) {
       SERIAL_ECHOLNPAIR("Attempt to write past end of LUN: ", block);
       return false;
     }
-    #if USB_DEBUG > 1
+    #if USB_DEBUG >= 4
       SERIAL_ECHOLNPAIR("Write block ", block);
     #endif
   #endif

Marlin/src/sd/usb_flashdrive/Sd2Card_FlashDrive.h

@@ -26,12 +26,6 @@
  * \brief Sd2Card class for V2 SD/SDHC cards
  */
 
-/* Uncomment USB_DEBUG to enable debugging.
- *    1 - basic debugging and bounds checking
- *    2 - print each block access
- */
-//#define USB_DEBUG 1
-
 #include "../SdFatConfig.h"
 #include "../SdInfo.h"
 
@@ -52,24 +46,13 @@
 
 class Sd2Card {
   private:
-
-    typedef enum : uint8_t {
-      USB_HOST_UNINITIALIZED,
-      USB_HOST_INITIALIZED,
-      USB_HOST_DELAY_INIT,
-      USB_HOST_WAITING
-    } state_t;
-
-    static state_t state;
-
     uint32_t pos;
-    #ifdef USB_DEBUG
-      uint32_t lun0_capacity;
-    #endif
 
-    static inline bool ready() { return state == USB_HOST_INITIALIZED; }
+    static void usbStateDebug();
 
   public:
+    static bool usbStartup();
+
     bool init(const uint8_t sckRateID=0, const pin_t chipSelectPin=SD_CHIP_SELECT_PIN);
 
     static void idle();
@@ -87,4 +70,5 @@ class Sd2Card {
 
     uint32_t cardSize();
     static bool isInserted();
+    static bool ready();
 };

Marlin/src/sd/usb_flashdrive/lib-uhs2/README.txt

@@ -1,15 +1,4 @@
 
-==== SUMMARY ====
-
-Source Path:                           Repository:                           License:
-------------                           -----------                           --------
-usb_flashdrive/lib                     github.com/felis/USB_Host_Shield_2.0  GPLv2 or later
-usb_flashdrive/lib/masstorage.cpp [1]  github.com/greiman/UsbFat             MIT
-usb_flashdrive/lib/settings.h [1]      github.com/greiman/UsbFat             MIT
-
-[1] Changes related to SKIP_WRITE_PROTECT and DELAY only
-
-
 ==== USB HOST SHIELD 2.0 LIBRARY ====
 
 The lib/ folder contains a subset of the files from the USB Host Shield 2.0
@@ -26,6 +15,15 @@ files needed for Marlin as "GPLv2 or later", as documented in this thread.
 Small modifications have been made to the source. Please search for
 USB_FLASH_DRIVE_SUPPORT or look at the patch file to see what was changed.
 
+==== LICENSE SUMMARY ====
+
+Source Path:                 Repository:                           License:
+------------                 -----------                           --------
+lib-uhs3/                    github.com/felis/USB_Host_Shield_2.0  GPLv2 or later
+lib-uhs3/lib/masstorage.cpp  github.com/greiman/UsbFat [1]         MIT
+lib-uhs3/lib/settings.h      github.com/greiman/UsbFat [1]         MIT
+
+[1] Changes related to SKIP_WRITE_PROTECT and DELAY only
 
 ==== PERFORMANCE ENHANCEMENTS FOR USB DRIVES ====
 

Marlin/src/sd/usb_flashdrive/lib-uhs2/Usb.cpp

@@ -26,7 +26,7 @@
 
 #include "../../../inc/MarlinConfigPre.h"
 
-#if ENABLED(USB_FLASH_DRIVE_SUPPORT)
+#if ENABLED(USB_FLASH_DRIVE_SUPPORT) && DISABLED(USE_UHS3_USB)
 
 #include "Usb.h"
 

Marlin/src/sd/usb_flashdrive/lib-uhs2/Usb.h

@@ -45,8 +45,7 @@
 #include "address.h"
 //#include "avrpins.h"
 #include "usb_ch9.h"
-//#include "usbhost.h"
+#include "usbhost.h"
-#include "../usb_host.h"
 #include "UsbCore.h"
 #include "parsetools.h"
 #include "confdescparser.h"

Marlin/src/sd/usb_flashdrive/lib-uhs2/masstorage.cpp

@@ -25,7 +25,7 @@
 
 #include "../../../inc/MarlinConfigPre.h"
 
-#if ENABLED(USB_FLASH_DRIVE_SUPPORT)
+#if ENABLED(USB_FLASH_DRIVE_SUPPORT) && DISABLED(USE_UHS3_USB)
 
 #include "masstorage.h"
 
@@ -762,7 +762,7 @@ uint8_t BulkOnly::Page3F(uint8_t lun) {
                 buf[i] = 0x00;
         }
         WriteOk[lun] = true;
-        #if ENABLED(USB_FLASH_DRIVE_SUPPORT) && defined(SKIP_WRITE_PROTECT)
+        #ifdef SKIP_WRITE_PROTECT
           return 0;
         #endif
         uint8_t rc = ModeSense6(lun, 0, 0x3f, 0, 192, buf);

Marlin/src/sd/usb_flashdrive/lib-uhs2/max3421e.h

@@ -191,6 +191,15 @@
 #define bmSNDTOG1       0x80
 
 #define rHXFR       0xf0    //30<<3
+
+#undef tokSETUP
+#undef tokIN
+#undef tokOUT
+#undef tokINHS
+#undef tokOUTHS
+#undef tokISOIN
+#undef tokISOOUT
+
 /* Host transfer token values for writing the HXFR register (R30)   */
 /* OR this bit field with the endpoint number in bits 3:0               */
 #define tokSETUP  0x10  // HS=0, ISO=0, OUTNIN=0, SETUP=1

Marlin/src/sd/usb_flashdrive/lib-uhs2/message.cpp

@@ -25,7 +25,7 @@
 
 #include "../../../inc/MarlinConfigPre.h"
 
-#if ENABLED(USB_FLASH_DRIVE_SUPPORT)
+#if ENABLED(USB_FLASH_DRIVE_SUPPORT) && DISABLED(USE_UHS3_USB)
 
 #include "Usb.h"
 

Marlin/src/sd/usb_flashdrive/lib-uhs2/parsetools.cpp

@@ -25,7 +25,7 @@
 
 #include "../../../inc/MarlinConfigPre.h"
 
-#if ENABLED(USB_FLASH_DRIVE_SUPPORT)
+#if ENABLED(USB_FLASH_DRIVE_SUPPORT) && DISABLED(USE_UHS3_USB)
 
 #include "Usb.h"
 

Marlin/src/sd/usb_flashdrive/lib-uhs2/usbhost.cpp

@@ -23,12 +23,12 @@
  * lib/usbhost.c". This has been rewritten to use SPI routines from the
  * Marlin HAL */
 
-#include "../../inc/MarlinConfigPre.h"
+#include "../../../inc/MarlinConfigPre.h"
 
-#if ENABLED(USB_FLASH_DRIVE_SUPPORT)
+#if ENABLED(USB_FLASH_DRIVE_SUPPORT) && DISABLED(USE_UHS3_USB)
 
-#include "lib/Usb.h"
+#include "Usb.h"
-#include "usb_host.h"
+#include "usbhost.h"
 
 uint8_t MAX3421e::vbusState = 0;
 

Marlin/src/sd/usb_flashdrive/lib-uhs3/README.txt

@@ -0,0 +1,31 @@
+==== USB HOST SHIELD 3.0 LIBRARY ====
+
+The lib-uhs3/ folder contains a subset of the files from the USB Host Shield
+3.0 library:
+
+  https://github.com/felis/UHS30
+
+
+==== LICENSE SUMMARY ====
+
+Source Path:              Repository:                    License:
+------------              -----------                    --------
+usb_flashdrive/lib        github.com/felis/UHS30         GPLv2 or later
+
+
+==== MARLIN INTEGRATION WORK ====
+
+All additional work done to integrate USB into Marlin was performed by
+AlephObjects, Inc. and is licensed under the GPLv3.
+
+This version of UHS3 has been modified for better compatibility with Marlin.
+The upstream version of UHS 3.0 runs a frame timer interrupt every 1 ms to
+handle device polling. This timer interrupt interferes with Marlin's stepper
+IRQ, so the flag USB_HOST_MANUAL_POLL has been added to move the polling to
+the idle task. Additional logic was added to disable and enable the frame
+IRQ.
+
+SKIP_PAGE3F and USB_NO_TEST_UNIT_READY were added to work around bugs with
+certain devices.
+
+-- marcio@alephobjects.com

Marlin/src/sd/usb_flashdrive/lib-uhs3/UHS_host/UHS_BULK_STORAGE/UHS_BULK_STORAGE.h

@@ -0,0 +1,249 @@
+/* Copyright (C) 2015-2016 Andrew J. Kroll
+   and
+ Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web      :  http://www.circuitsathome.com
+e-mail   :  support@circuitsathome.com
+ */
+
+#if !defined(__UHS_BULK_STORAGE_H__)
+#define __UHS_BULK_STORAGE_H__
+
+
+////////////////////////////////////////////////////////////////////////////////
+// Define any of these options at the top of your sketch to override
+// the defaults contained herewith. Do NOT do modifications here.
+// Macro                                 | Settings and notes    | Default
+// -----------------------------------------+-----------------------+-----------
+//                                          | 1 to 8                |
+//                                          | Each LUN needs        |
+// MASS_MAX_SUPPORTED_LUN                   | ~13 bytes to be able  | 8
+//                                          | to track the state of |
+//                                          | each unit.            |
+// -----------------------------------------+-----------------------+-----------
+//                                          | Just define to use.   |
+// DEBUG_PRINTF_EXTRA_HUGE_UHS_BULK_STORAGE | works only if extra   |
+//                                          | huge debug is on too. |
+// -----------------------------------------^-----------------------^-----------
+
+#ifndef MASS_MAX_SUPPORTED_LUN
+#define MASS_MAX_SUPPORTED_LUN 8
+#endif
+
+#include "UHS_SCSI.h"
+
+#define                UHS_BULK_bmREQ_OUT USB_SETUP_HOST_TO_DEVICE|USB_SETUP_TYPE_CLASS|USB_SETUP_RECIPIENT_INTERFACE
+#define                 UHS_BULK_bmREQ_IN USB_SETUP_DEVICE_TO_HOST|USB_SETUP_TYPE_CLASS|USB_SETUP_RECIPIENT_INTERFACE
+
+// Request Codes
+#define                 UHS_BULK_REQ_ADSC 0x00U
+#define                  UHS_BULK_REQ_GET 0xFCU
+#define                  UHS_BULK_REQ_PUT 0xFDU
+#define          UHS_BULK_REQ_GET_MAX_LUN 0xFEU
+#define                UHS_BULK_REQ_BOMSR 0xFFU // Mass Storage Reset
+
+#define            UHS_BULK_CBW_SIGNATURE 0x43425355LU
+#define            UHS_BULK_CSW_SIGNATURE 0x53425355LU
+
+#define              UHS_BULK_CMD_DIR_OUT 0x00U
+#define               UHS_BULK_CMD_DIR_IN 0x80U
+
+/* Bulk error codes */
+#define              UHS_BULK_ERR_SUCCESS UHS_HOST_ERROR_NONE
+#define          UHS_BULK_ERR_PHASE_ERROR 0x22U
+#define       UHS_BULK_ERR_UNIT_NOT_READY 0x23U
+#define            UHS_BULK_ERR_UNIT_BUSY 0x24U
+#define                UHS_BULK_ERR_STALL 0x25U
+#define    UHS_BULK_ERR_CMD_NOT_SUPPORTED 0x26U
+#define          UHS_BULK_ERR_INVALID_CSW 0x27U
+#define             UHS_BULK_ERR_NO_MEDIA 0x28U
+#define              UHS_BULK_ERR_BAD_LBA 0x29U
+#define        UHS_BULK_ERR_MEDIA_CHANGED 0x2AU
+#define  UHS_BULK_ERR_DEVICE_DISCONNECTED UHS_HOST_ERROR_UNPLUGGED
+#define    UHS_BULK_ERR_UNABLE_TO_RECOVER 0x32U // Reset recovery error
+#define          UHS_BULK_ERR_INVALID_LUN 0x33U
+#define          UHS_BULK_ERR_WRITE_STALL 0x34U
+#define            UHS_BULK_ERR_READ_NAKS 0x35U
+#define           UHS_BULK_ERR_WRITE_NAKS 0x36U
+#define      UHS_BULK_ERR_WRITE_PROTECTED 0x37U
+#define      UHS_BULK_ERR_NOT_IMPLEMENTED 0xFDU
+#define   UHS_BULK_ERR_GENERAL_SCSI_ERROR 0xF0U
+#define    UHS_BULK_ERR_GENERAL_USB_ERROR 0xFFU
+#define                 UHS_BULK_ERR_USER 0xA0U // For subclasses to define their own error codes
+
+#define                MASS_MAX_ENDPOINTS 3
+
+struct UHS_BULK_CommandBlockWrapperBase {
+        volatile uint32_t dCBWSignature;
+        volatile uint32_t dCBWTag;
+        volatile uint32_t dCBWDataTransferLength;
+        volatile uint8_t bmCBWFlags;
+public:
+
+        UHS_BULK_CommandBlockWrapperBase(void) {
+        }
+
+        UHS_BULK_CommandBlockWrapperBase(uint32_t tag, uint32_t xflen, uint8_t flgs) :
+        dCBWSignature(UHS_BULK_CBW_SIGNATURE), dCBWTag(tag), dCBWDataTransferLength(xflen), bmCBWFlags(flgs) {
+        }
+} __attribute__((packed));
+
+struct UHS_BULK_CommandBlockWrapper : public UHS_BULK_CommandBlockWrapperBase {
+
+        struct {
+                uint8_t bmCBWLUN : 4;
+                uint8_t bmReserved1 : 4;
+        };
+
+        struct {
+                uint8_t bmCBWCBLength : 4;
+                uint8_t bmReserved2 : 4;
+        };
+
+        uint8_t CBWCB[16];
+
+public:
+        // All zeroed.
+
+        UHS_BULK_CommandBlockWrapper() :
+        UHS_BULK_CommandBlockWrapperBase(0, 0, 0), bmReserved1(0), bmReserved2(0) {
+                for(int i = 0; i < 16; i++) CBWCB[i] = 0;
+        }
+
+        // Generic Wrap, CDB zeroed.
+
+        UHS_BULK_CommandBlockWrapper(uint32_t tag, uint32_t xflen, uint8_t flgs, uint8_t lu, uint8_t cmdlen, uint8_t cmd) :
+        UHS_BULK_CommandBlockWrapperBase(tag, xflen, flgs),
+        bmCBWLUN(lu), bmReserved1(0), bmCBWCBLength(cmdlen), bmReserved2(0) {
+                for(int i = 0; i < 16; i++) CBWCB[i] = 0;
+                SCSI_CDB_BASE_t *x = reinterpret_cast<SCSI_CDB_BASE_t *>(CBWCB);
+                x->LUN = cmd;
+        }
+
+        // Wrap for CDB of 6
+
+        UHS_BULK_CommandBlockWrapper(uint32_t tag, uint32_t xflen, SCSI_CDB6_t *cdb, uint8_t dir) :
+        UHS_BULK_CommandBlockWrapperBase(tag, xflen, dir),
+        bmCBWLUN(cdb->LUN), bmReserved1(0), bmCBWCBLength(6), bmReserved2(0) {
+                memcpy(&CBWCB, cdb, 6);
+        }
+        // Wrap for CDB of 10
+
+        UHS_BULK_CommandBlockWrapper(uint32_t tag, uint32_t xflen, SCSI_CDB10_t *cdb, uint8_t dir) :
+        UHS_BULK_CommandBlockWrapperBase(tag, xflen, dir),
+        bmCBWLUN(cdb->LUN), bmReserved1(0), bmCBWCBLength(10), bmReserved2(0) {
+                memcpy(&CBWCB, cdb, 10);
+        }
+} __attribute__((packed));
+
+struct UHS_BULK_CommandStatusWrapper {
+        uint32_t dCSWSignature;
+        uint32_t dCSWTag;
+        uint32_t dCSWDataResidue;
+        uint8_t bCSWStatus;
+} __attribute__((packed));
+
+class UHS_Bulk_Storage : public UHS_USBInterface {
+protected:
+        static const uint8_t epDataInIndex = 1; // DataIn endpoint index
+        static const uint8_t epDataOutIndex = 2; // DataOUT endpoint index
+        static const uint8_t epInterruptInIndex = 3; // InterruptIN  endpoint index
+
+        uint8_t bMaxLUN; // Max LUN
+        volatile uint32_t dCBWTag; // Tag
+        volatile uint8_t bTheLUN; // Active LUN
+        volatile uint32_t CurrentCapacity[MASS_MAX_SUPPORTED_LUN]; // Total sectors
+        volatile uint16_t CurrentSectorSize[MASS_MAX_SUPPORTED_LUN]; // Sector size, clipped to 16 bits
+        volatile bool LUNOk[MASS_MAX_SUPPORTED_LUN]; // use this to check for media changes.
+        volatile bool WriteOk[MASS_MAX_SUPPORTED_LUN];
+        void PrintEndpointDescriptor(const USB_ENDPOINT_DESCRIPTOR* ep_ptr);
+
+public:
+        UHS_Bulk_Storage(UHS_USB_HOST_BASE *p);
+
+        volatile UHS_EpInfo epInfo[MASS_MAX_ENDPOINTS];
+
+        uint8_t GetbMaxLUN(void) {
+                return bMaxLUN; // Max LUN
+        }
+
+        uint8_t GetbTheLUN(void) {
+                return bTheLUN; // Active LUN
+        }
+
+        bool WriteProtected(uint8_t lun);
+        uint8_t MediaCTL(uint8_t lun, uint8_t ctl);
+        uint8_t Read(uint8_t lun, uint32_t addr, uint16_t bsize, uint8_t blocks, uint8_t *buf);
+        uint8_t Write(uint8_t lun, uint32_t addr, uint16_t bsize, uint8_t blocks, const uint8_t *buf);
+        uint8_t LockMedia(uint8_t lun, uint8_t lock);
+
+        bool LUNIsGood(uint8_t lun);
+        uint32_t GetCapacity(uint8_t lun);
+        uint16_t GetSectorSize(uint8_t lun);
+        uint8_t SCSITransaction6(SCSI_CDB6_t *cdb, uint16_t buf_size, void *buf, uint8_t dir);
+        uint8_t SCSITransaction10(SCSI_CDB10_t *cdb, uint16_t buf_size, void *buf, uint8_t dir);
+
+
+        // Configure and internal methods, these should never be called by a user's sketch.
+        uint8_t Start(void);
+        bool OKtoEnumerate(ENUMERATION_INFO *ei);
+        uint8_t SetInterface(ENUMERATION_INFO *ei);
+
+        uint8_t GetAddress(void) {
+                return bAddress;
+        };
+
+
+        void Poll(void);
+
+        void DriverDefaults(void);
+
+
+private:
+        void Reset(void);
+        void CheckMedia(void);
+
+        bool IsValidCBW(uint8_t size, uint8_t *pcbw);
+        bool IsMeaningfulCBW(uint8_t size, uint8_t *pcbw);
+        bool IsValidCSW(UHS_BULK_CommandStatusWrapper *pcsw, UHS_BULK_CommandBlockWrapperBase *pcbw);
+
+        bool CheckLUN(uint8_t lun);
+
+        uint8_t Inquiry(uint8_t lun, uint16_t size, uint8_t *buf);
+        uint8_t TestUnitReady(uint8_t lun);
+        uint8_t RequestSense(uint8_t lun, uint16_t size, uint8_t *buf);
+        uint8_t ModeSense6(uint8_t lun, uint8_t pc, uint8_t page, uint8_t subpage, uint8_t len, uint8_t *buf);
+        uint8_t GetMaxLUN(uint8_t *max_lun);
+        uint8_t SetCurLUN(uint8_t lun);
+        uint8_t ResetRecovery();
+        uint8_t ReadCapacity10(uint8_t lun, uint8_t *buf);
+        uint8_t Page3F(uint8_t lun);
+        uint8_t ClearEpHalt(uint8_t index);
+        uint8_t Transaction(UHS_BULK_CommandBlockWrapper *cbw, uint16_t bsize, void *buf);
+        uint8_t HandleUsbError(uint8_t error, uint8_t index);
+        uint8_t HandleSCSIError(uint8_t status);
+
+};
+
+#if defined(LOAD_UHS_BULK_STORAGE) && !defined(UHS_BULK_STORAGE_LOADED)
+#include "UHS_BULK_STORAGE_INLINE.h"
+#endif
+#endif // __MASSTORAGE_H__

Marlin/src/sd/usb_flashdrive/lib-uhs3/UHS_host/UHS_BULK_STORAGE/UHS_SCSI.h

@@ -0,0 +1,328 @@
+/* Copyright (C) 2015-2016 Andrew J. Kroll
+   and
+Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web      :  http://www.circuitsathome.com
+e-mail   :  support@circuitsathome.com
+ */
+
+#ifndef UHS_SCSI_H
+#define	UHS_SCSI_H
+
+/*
+ * Reference documents from T10 (http://www.t10.org)
+ * SCSI Primary Commands - 3 (SPC-3)
+ * SCSI Block Commands - 2 (SBC-2)
+ * Multi-Media Commands - 5 (MMC-5)
+ */
+
+/* Group 1 commands (CDB's here are should all be 6-bytes) */
+#define SCSI_CMD_TEST_UNIT_READY	0x00U
+#define SCSI_CMD_REQUEST_SENSE		0x03U
+#define SCSI_CMD_FORMAT_UNIT		0x04U
+#define SCSI_CMD_READ_6			0x08U
+#define SCSI_CMD_WRITE_6		0x0AU
+#define SCSI_CMD_INQUIRY		0x12U
+#define SCSI_CMD_MODE_SELECT_6          0x15U
+#define SCSI_CMD_MODE_SENSE_6		0x1AU
+#define SCSI_CMD_START_STOP_UNIT	0x1BU
+#define SCSI_CMD_PREVENT_REMOVAL        0x1EU
+/* Group 2 Commands (CDB's here are 10-bytes) */
+#define SCSI_CMD_READ_FORMAT_CAPACITIES 0x23U
+#define SCSI_CMD_READ_CAPACITY_10	0x25U
+#define SCSI_CMD_READ_10		0x28U
+#define SCSI_CMD_WRITE_10		0x2AU
+#define SCSI_CMD_SEEK_10                0x2BU
+#define SCSI_CMD_ERASE_10               0x2CU
+#define SCSI_CMD_WRITE_AND_VERIFY_10    0x2EU
+#define SCSI_CMD_VERIFY_10              0x2FU
+#define SCSI_CMD_SYNCHRONIZE_CACHE      0x35U
+#define SCSI_CMD_WRITE_BUFFER           0x3BU
+#define SCSI_CMD_READ_BUFFER            0x3CU
+#define SCSI_CMD_READ_SUBCHANNEL        0x42U
+#define SCSI_CMD_READ_TOC               0x43U
+#define SCSI_CMD_READ_HEADER            0x44U
+#define SCSI_CMD_PLAY_AUDIO_10          0x45U
+#define SCSI_CMD_GET_CONFIGURATION      0x46U
+#define SCSI_CMD_PLAY_AUDIO_MSF         0x47U
+#define SCSI_CMD_PLAY_AUDIO_TI          0x48U
+#define SCSI_CMD_PLAY_TRACK_REL_10      0x49U
+#define SCSI_CMD_GET_EVENT_STATUS       0x4AU
+#define SCSI_CMD_PAUSE_RESUME           0x4BU
+#define SCSI_CMD_READ_DISC_INFORMATION  0x51U
+#define SCSI_CMD_READ_TRACK_INFORMATION 0x52U
+#define SCSI_CMD_RESERVE_TRACK          0x53U
+#define SCSI_CMD_SEND_OPC_INFORMATION   0x54U
+#define SCSI_CMD_MODE_SELECT_10         0x55U
+#define SCSI_CMD_REPAIR_TRACK           0x58U
+#define SCSI_CMD_MODE_SENSE_10          0x5AU
+#define SCSI_CMD_CLOSE_TRACK_SESSION    0x5BU
+#define SCSI_CMD_READ_BUFFER_CAPACITY   0x5CU
+#define SCSI_CMD_SEND_CUE_SHEET         0x5DU
+/* Group 5 Commands (CDB's here are 12-bytes) */
+#define SCSI_CMD_REPORT_LUNS            0xA0U
+#define SCSI_CMD_BLANK                  0xA1U
+#define SCSI_CMD_SECURITY_PROTOCOL_IN   0xA2U
+#define SCSI_CMD_SEND_KEY               0xA3U
+#define SCSI_CMD_REPORT_KEY             0xA4U
+#define SCSI_CMD_PLAY_AUDIO_12          0xA5U
+#define SCSI_CMD_LOAD_UNLOAD            0xA6U
+#define SCSI_CMD_SET_READ_AHEAD         0xA7U
+#define SCSI_CMD_READ_12                0xA8U
+#define SCSI_CMD_PLAY_TRACK_REL_12      0xA9U
+#define SCSI_CMD_WRITE_12               0xAAU
+#define SCSI_CMD_READ_MEDIA_SERIAL_12   0xABU
+#define SCSI_CMD_GET_PERFORMANCE        0xACU
+#define SCSI_CMD_READ_DVD_STRUCTURE     0xADU
+#define SCSI_CMD_SECURITY_PROTOCOL_OUT  0xB5U
+#define SCSI_CMD_SET_STREAMING          0xB6U
+#define SCSI_CMD_READ_MSF               0xB9U
+#define SCSI_CMD_SET_SPEED              0xBBU
+#define SCSI_CMD_MECHANISM_STATUS       0xBDU
+#define SCSI_CMD_READ_CD                0xBEU
+#define SCSI_CMD_SEND_DISC_STRUCTURE    0xBFU
+/* Vendor-unique Commands, included for completeness */
+#define SCSI_CMD_CD_PLAYBACK_STATUS     0xC4U /* SONY unique */
+#define SCSI_CMD_PLAYBACK_CONTROL       0xC9U /* SONY unique */
+#define SCSI_CMD_READ_CDDA              0xD8U /* Vendor unique */
+#define SCSI_CMD_READ_CDXA              0xDBU /* Vendor unique */
+#define SCSI_CMD_READ_ALL_SUBCODES      0xDFU /* Vendor unique */
+
+/* SCSI error codes */
+#define SCSI_S_NOT_READY		0x02U
+#define SCSI_S_MEDIUM_ERROR		0x03U
+#define SCSI_S_ILLEGAL_REQUEST		0x05U
+#define SCSI_S_UNIT_ATTENTION		0x06U
+#define SCSI_ASC_LBA_OUT_OF_RANGE       0x21U
+#define SCSI_ASC_MEDIA_CHANGED          0x28U
+#define SCSI_ASC_MEDIUM_NOT_PRESENT     0x3AU
+
+struct SCSI_Capacity {
+        uint8_t data[8];
+        //uint32_t dwBlockAddress;
+        //uint32_t dwBlockLength;
+} __attribute__((packed));
+
+struct SCSI_CDB_BASE {
+        uint8_t Opcode;
+
+        unsigned unused : 5;
+        unsigned LUN : 3;
+
+        uint8_t info[12];
+} __attribute__((packed));
+
+typedef SCSI_CDB_BASE SCSI_CDB_BASE_t;
+
+struct SCSI_CDB6 {
+        uint8_t Opcode;
+
+        unsigned LBAMSB : 5;
+        unsigned LUN : 3;
+
+        uint8_t LBAHB;
+        uint8_t LBALB;
+        uint8_t AllocationLength;
+        uint8_t Control;
+
+public:
+
+        SCSI_CDB6(uint8_t _Opcode, uint8_t _LUN, uint32_t LBA, uint8_t _AllocationLength, uint8_t _Control) :
+        Opcode(_Opcode), LBAMSB(UHS_UINT8_BYTE2(LBA) & 0x1f), LUN(_LUN), LBAHB(UHS_UINT8_BYTE1(LBA)), LBALB(UHS_UINT8_BYTE0(LBA)),
+        AllocationLength(_AllocationLength), Control(_Control) {
+        }
+
+        SCSI_CDB6(uint8_t _Opcode, uint8_t _LUN, uint8_t _AllocationLength, uint8_t _Control) :
+        Opcode(_Opcode), LBAMSB(0), LUN(_LUN), LBAHB(0), LBALB(0),
+        AllocationLength(_AllocationLength), Control(_Control) {
+        }
+} __attribute__((packed));
+
+typedef SCSI_CDB6 SCSI_CDB6_t;
+
+struct SCSI_CDB10 {
+        uint8_t Opcode;
+
+        unsigned Service_Action : 5;
+        unsigned LUN : 3;
+
+        uint8_t LBA_L_M_MB;
+        uint8_t LBA_L_M_LB;
+        uint8_t LBA_L_L_MB;
+        uint8_t LBA_L_L_LB;
+
+        uint8_t Misc2;
+
+        uint8_t ALC_MB;
+        uint8_t ALC_LB;
+
+        uint8_t Control;
+public:
+
+        SCSI_CDB10(uint8_t _Opcode, uint8_t _LUN) :
+        Opcode(_Opcode), Service_Action(0), LUN(_LUN),
+        LBA_L_M_MB(0), LBA_L_M_LB(0), LBA_L_L_MB(0), LBA_L_L_LB(0),
+        Misc2(0), ALC_MB(0), ALC_LB(0), Control(0) {
+        }
+
+        SCSI_CDB10(uint8_t _Opcode, uint8_t _LUN, uint16_t xflen, uint32_t _LBA) :
+        Opcode(_Opcode), Service_Action(0), LUN(_LUN),
+        LBA_L_M_MB(UHS_UINT8_BYTE3(_LBA)), LBA_L_M_LB(UHS_UINT8_BYTE2(_LBA)), LBA_L_L_MB(UHS_UINT8_BYTE1(_LBA)), LBA_L_L_LB(UHS_UINT8_BYTE0(_LBA)),
+        Misc2(0), ALC_MB(UHS_UINT8_BYTE1(xflen)), ALC_LB(UHS_UINT8_BYTE0(xflen)), Control(0) {
+        }
+} __attribute__((packed));
+
+typedef SCSI_CDB10 SCSI_CDB10_t;
+
+struct SCSI_CDB12 {
+        uint8_t Opcode;
+
+        unsigned Service_Action : 5;
+        unsigned Misc : 3;
+
+        uint8_t LBA_L_M_LB;
+        uint8_t LBA_L_L_MB;
+        uint8_t LBA_L_L_LB;
+
+        uint8_t ALC_M_LB;
+        uint8_t ALC_L_MB;
+        uint8_t ALC_L_LB;
+        uint8_t Control;
+} __attribute__((packed));
+
+typedef SCSI_CDB12 SCSI_CDB12_t;
+
+struct SCSI_CDB_LBA32_16 {
+        uint8_t Opcode;
+
+        unsigned Service_Action : 5;
+        unsigned Misc : 3;
+
+        uint8_t LBA_L_M_MB;
+        uint8_t LBA_L_M_LB;
+        uint8_t LBA_L_L_MB;
+        uint8_t LBA_L_L_LB;
+
+        uint8_t A_M_M_MB;
+        uint8_t A_M_M_LB;
+        uint8_t A_M_L_MB;
+        uint8_t A_M_L_LB;
+
+        uint8_t ALC_M_MB;
+        uint8_t ALC_M_LB;
+        uint8_t ALC_L_MB;
+        uint8_t ALC_L_LB;
+
+        uint8_t Misc2;
+        uint8_t Control;
+} __attribute__((packed));
+
+struct SCSI_CDB_LBA64_16 {
+        uint8_t Opcode;
+        uint8_t Misc;
+
+        uint8_t LBA_M_M_MB;
+        uint8_t LBA_M_M_LB;
+        uint8_t LBA_M_L_MB;
+        uint8_t LBA_M_L_LB;
+
+        uint8_t LBA_L_M_MB;
+        uint8_t LBA_L_M_LB;
+        uint8_t LBA_L_L_MB;
+        uint8_t LBA_L_L_LB;
+
+        uint8_t ALC_M_MB;
+        uint8_t ALC_M_LB;
+        uint8_t ALC_L_MB;
+        uint8_t ALC_L_LB;
+
+        uint8_t Misc2;
+        uint8_t Control;
+} __attribute__((packed));
+
+struct SCSI_Inquiry_Response {
+        uint8_t DeviceType : 5;
+        uint8_t PeripheralQualifier : 3;
+
+        unsigned Reserved : 7;
+        unsigned Removable : 1;
+
+        uint8_t Version;
+
+        unsigned ResponseDataFormat : 4;
+        unsigned HISUP : 1;
+        unsigned NormACA : 1;
+        unsigned TrmTsk : 1;
+        unsigned AERC : 1;
+
+        uint8_t AdditionalLength;
+
+        unsigned PROTECT : 1;
+        unsigned Res : 2;
+        unsigned ThreePC : 1;
+        unsigned TPGS : 2;
+        unsigned ACC : 1;
+        unsigned SCCS : 1;
+
+        unsigned ADDR16 : 1;
+        unsigned R1 : 1;
+        unsigned R2 : 1;
+        unsigned MCHNGR : 1;
+        unsigned MULTIP : 1;
+        unsigned VS : 1;
+        unsigned ENCSERV : 1;
+        unsigned BQUE : 1;
+
+        unsigned SoftReset : 1;
+        unsigned CmdQue : 1;
+        unsigned Reserved4 : 1;
+        unsigned Linked : 1;
+        unsigned Sync : 1;
+        unsigned WideBus16Bit : 1;
+        unsigned WideBus32Bit : 1;
+        unsigned RelAddr : 1;
+
+        uint8_t VendorID[8];
+        uint8_t ProductID[16];
+        uint8_t RevisionID[4];
+} __attribute__((packed));
+
+struct SCSI_Request_Sense_Response {
+        uint8_t bResponseCode;
+        uint8_t bSegmentNumber;
+
+        uint8_t bmSenseKey : 4;
+        uint8_t bmReserved : 1;
+        uint8_t bmILI : 1;
+        uint8_t bmEOM : 1;
+        uint8_t bmFileMark : 1;
+
+        uint8_t Information[4];
+        uint8_t bAdditionalLength;
+        uint8_t CmdSpecificInformation[4];
+        uint8_t bAdditionalSenseCode;
+        uint8_t bAdditionalSenseQualifier;
+        uint8_t bFieldReplaceableUnitCode;
+        uint8_t SenseKeySpecific[3];
+} __attribute__((packed));
+
+#endif	/* UHS_SCSI_H */
+

Marlin/src/sd/usb_flashdrive/lib-uhs3/UHS_host/UHS_UNOFFICIAL_IDs.h

@@ -0,0 +1,33 @@
+/* Copyright (C) 2015-2016 Andrew J. Kroll
+   and
+Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web      :  http://www.circuitsathome.com
+e-mail   :  support@circuitsathome.com
+ */
+#ifndef _UHS_UNOFFICIAL_IDs_h
+#define _UHS_UNOFFICIAL_IDs_h
+
+// Bogus unofficial and unregistered VIDs from cloners to be listed here.
+
+#define UHS_VID_UNOFFICIAL_JOYTECH 0x162EU  // For unofficial Joytech controllers
+
+#endif

Marlin/src/sd/usb_flashdrive/lib-uhs3/UHS_host/UHS_UsbCore.h

@@ -0,0 +1,336 @@
+/* Copyright (C) 2015-2016 Andrew J. Kroll
+   and
+Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web      :  http://www.circuitsathome.com
+e-mail   :  support@circuitsathome.com
+ */
+
+#if !defined(_UHS_host_h_) || defined(USBCORE_H)
+#error "Never include UHS_UsbCore.h directly; include UHS_Host.h instead"
+#else
+#define USBCORE_H
+
+#ifndef UHS_HOST_MAX_INTERFACE_DRIVERS
+#define                UHS_HOST_MAX_INTERFACE_DRIVERS 0x10U // Default maximum number of USB interface drivers
+#endif
+
+#if !defined(SYSTEM_OR_SPECIAL_YIELD)
+#define SYSTEM_OR_SPECIAL_YIELD(...) VOID0
+#endif
+
+#if !defined(SYSTEM_OR_SPECIAL_YIELD_FROM_ISR)
+#define SYSTEM_OR_SPECIAL_YIELD_FROM_ISR(...) SYSTEM_OR_SPECIAL_YIELD
+#endif
+
+// As we make extensions to a target interface add to UHS_HOST_MAX_INTERFACE_DRIVERS
+// This offset gets calculated for supporting wide subclasses, such as HID, BT, etc.
+#define                                 UHS_HID_INDEX (UHS_HOST_MAX_INTERFACE_DRIVERS + 1)
+
+/* Common setup data constant combinations  */
+//get descriptor request type
+#define                           UHS_bmREQ_GET_DESCR (USB_SETUP_DEVICE_TO_HOST|USB_SETUP_TYPE_STANDARD|USB_SETUP_RECIPIENT_DEVICE)
+
+//set request type for all but 'set feature' and 'set interface'
+#define                                 UHS_bmREQ_SET (USB_SETUP_HOST_TO_DEVICE|USB_SETUP_TYPE_STANDARD|USB_SETUP_RECIPIENT_DEVICE)
+
+//get interface request type
+#define                         UHS_bmREQ_CL_GET_INTF (USB_SETUP_DEVICE_TO_HOST|USB_SETUP_TYPE_CLASS|USB_SETUP_RECIPIENT_INTERFACE)
+
+// D7           data transfer direction (0 - host-to-device, 1 - device-to-host)
+// D6-5         Type (0- standard, 1 - class, 2 - vendor, 3 - reserved)
+// D4-0         Recipient (0 - device, 1 - interface, 2 - endpoint, 3 - other, 4..31 - reserved)
+
+
+// TO-DO: Use the python script to generate these.
+// TO-DO: Add _all_ subclasses here.
+// USB Device Classes, Subclasses and Protocols
+////////////////////////////////////////////////////////////////////////////////
+// Use Class Info in the Interface Descriptors
+#define                  UHS_USB_CLASS_USE_CLASS_INFO 0x00U
+
+////////////////////////////////////////////////////////////////////////////////
+// Audio
+#define                           UHS_USB_CLASS_AUDIO 0x01U
+// Subclasses
+#define                 UHS_USB_SUBCLASS_AUDIOCONTROL 0x01U
+#define               UHS_USB_SUBCLASS_AUDIOSTREAMING 0x02U
+#define                UHS_USB_SUBCLASS_MIDISTREAMING 0x03U
+
+////////////////////////////////////////////////////////////////////////////////
+// Communications and CDC Control
+#define                UHS_USB_CLASS_COM_AND_CDC_CTRL 0x02U
+
+////////////////////////////////////////////////////////////////////////////////
+// HID
+#define                             UHS_USB_CLASS_HID 0x03U
+// Subclasses
+#define                         UHS_HID_BOOT_SUBCLASS 0x01U
+// Protocols
+#define             UHS_HID_PROTOCOL_HIDBOOT_KEYBOARD 0x01U
+#define                UHS_HID_PROTOCOL_HIDBOOT_MOUSE 0x02U
+////////////////////////////////////////////////////////////////////////////////
+// Physical
+#define                        UHS_USB_CLASS_PHYSICAL 0x05U
+
+////////////////////////////////////////////////////////////////////////////////
+// Image
+#define                           UHS_USB_CLASS_IMAGE 0x06U
+
+////////////////////////////////////////////////////////////////////////////////
+// Printer
+#define                         UHS_USB_CLASS_PRINTER 0x07U
+
+////////////////////////////////////////////////////////////////////////////////
+// Mass Storage
+#define                    UHS_USB_CLASS_MASS_STORAGE 0x08
+// Subclasses
+#define           UHS_BULK_SUBCLASS_SCSI_NOT_REPORTED 0x00U   // De facto use
+#define                         UHS_BULK_SUBCLASS_RBC 0x01U
+#define                       UHS_BULK_SUBCLASS_ATAPI 0x02U   // MMC-5 (ATAPI)
+#define                   UHS_BULK_SUBCLASS_OBSOLETE1 0x03U   // Was QIC-157
+#define                         UHS_BULK_SUBCLASS_UFI 0x04U   // Specifies how to interface Floppy Disk Drives to USB
+#define                   UHS_BULK_SUBCLASS_OBSOLETE2 0x05U   // Was SFF-8070i
+#define                        UHS_BULK_SUBCLASS_SCSI 0x06U   // SCSI Transparent Command Set
+#define                       UHS_BULK_SUBCLASS_LSDFS 0x07U   // Specifies how host has to negotiate access before trying SCSI
+#define                    UHS_BULK_SUBCLASS_IEEE1667 0x08U
+// Protocols
+#define                            UHS_STOR_PROTO_CBI 0x00U   // CBI (with command completion interrupt)
+#define                     UHS_STOR_PROTO_CBI_NO_INT 0x01U   // CBI (without command completion interrupt)
+#define                       UHS_STOR_PROTO_OBSOLETE 0x02U
+#define                            UHS_STOR_PROTO_BBB 0x50U   // Bulk Only Transport
+#define                            UHS_STOR_PROTO_UAS 0x62U
+
+////////////////////////////////////////////////////////////////////////////////
+// Hub
+#define                             UHS_USB_CLASS_HUB 0x09U
+
+////////////////////////////////////////////////////////////////////////////////
+// CDC-Data
+#define                        UHS_USB_CLASS_CDC_DATA 0x0AU
+
+////////////////////////////////////////////////////////////////////////////////
+// Smart-Card
+#define                      UHS_USB_CLASS_SMART_CARD 0x0BU
+
+////////////////////////////////////////////////////////////////////////////////
+// Content Security
+#define                UHS_USB_CLASS_CONTENT_SECURITY 0x0DU
+
+////////////////////////////////////////////////////////////////////////////////
+// Video
+#define                           UHS_USB_CLASS_VIDEO 0x0EU
+
+////////////////////////////////////////////////////////////////////////////////
+// Personal Healthcare
+#define                 UHS_USB_CLASS_PERSONAL_HEALTH 0x0FU
+
+////////////////////////////////////////////////////////////////////////////////
+// Diagnostic Device
+#define               UHS_USB_CLASS_DIAGNOSTIC_DEVICE 0xDCU
+
+////////////////////////////////////////////////////////////////////////////////
+// Wireless Controller
+#define                   UHS_USB_CLASS_WIRELESS_CTRL 0xE0U
+
+////////////////////////////////////////////////////////////////////////////////
+// Miscellaneous
+#define                            UHS_USB_CLASS_MISC 0xEFU
+
+////////////////////////////////////////////////////////////////////////////////
+// Application Specific
+#define                    UHS_USB_CLASS_APP_SPECIFIC 0xFEU
+
+////////////////////////////////////////////////////////////////////////////////
+// Vendor Specific
+#define                 UHS_USB_CLASS_VENDOR_SPECIFIC 0xFFU
+
+////////////////////////////////////////////////////////////////////////////////
+
+
+/* USB state machine states */
+#define                       UHS_USB_HOST_STATE_MASK 0xF0U
+
+// Configure states, MSN == 0 --------------------------V
+#define                   UHS_USB_HOST_STATE_DETACHED 0x00U
+#define                   UHS_USB_HOST_STATE_DEBOUNCE 0x01U
+#define      UHS_USB_HOST_STATE_DEBOUNCE_NOT_COMPLETE 0x02U
+#define         UHS_USB_HOST_STATE_RESET_NOT_COMPLETE 0x03U
+#define                   UHS_USB_HOST_STATE_WAIT_SOF 0x04U
+#define             UHS_USB_HOST_STATE_WAIT_BUS_READY 0x05U
+#define               UHS_USB_HOST_STATE_RESET_DEVICE 0x0AU
+#define                UHS_USB_HOST_STATE_CONFIGURING 0x0CU // Looks like "CO"nfig (backwards)
+#define           UHS_USB_HOST_STATE_CONFIGURING_DONE 0x0DU // Looks like "DO"one (backwards)
+#define                      UHS_USB_HOST_STATE_CHECK 0x0EU
+#define                    UHS_USB_HOST_STATE_ILLEGAL 0x0FU // Foo
+
+// Run states, MSN != 0 --------------------------------V
+#define                    UHS_USB_HOST_STATE_RUNNING 0x60U // Looks like "GO"
+#define                       UHS_USB_HOST_STATE_IDLE 0x1DU // Looks like "ID"le
+#define                      UHS_USB_HOST_STATE_ERROR 0xF0U // Looks like "FO"o
+#define                 UHS_USB_HOST_STATE_INITIALIZE 0x10U // Looks like "I"nit
+
+// Host SE result codes.
+// Common SE results are stored in the low nybble, all interface drivers understand these plus 0x1f.
+// Extended SE results are 0x10-0x1e. SE code only understands these internal to the hardware.
+// Values > 0x1F are driver or other internal error conditions.
+// Return these result codes from your host controller driver to match the error condition
+// ALL Non-zero values are errors.
+// Values not listed in this table are not handled in the base class, or any host driver.
+
+#define                           UHS_HOST_ERROR_NONE 0x00U // No error
+#define                           UHS_HOST_ERROR_BUSY 0x01U // transfer pending
+#define                         UHS_HOST_ERROR_BADREQ 0x02U // Transfer Launch Request was bad
+#define                            UHS_HOST_ERROR_DMA 0x03U // DMA was too short, or too long
+#define                            UHS_HOST_ERROR_NAK 0x04U // Peripheral returned NAK
+#define                          UHS_HOST_ERROR_STALL 0x05U // Peripheral returned STALL
+#define                         UHS_HOST_ERROR_TOGERR 0x06U // Toggle error/ISO over-underrun
+#define                       UHS_HOST_ERROR_WRONGPID 0x07U // Received wrong Packet ID
+#define                          UHS_HOST_ERROR_BADBC 0x08U // Byte count is bad
+#define                         UHS_HOST_ERROR_PIDERR 0x09U // Received Packet ID is corrupted
+#define                          UHS_HOST_ERROR_BADRQ 0x0AU // Packet error. Increase max packet.
+#define                            UHS_HOST_ERROR_CRC 0x0BU // USB CRC was incorrect
+#define                           UHS_HOST_ERROR_KERR 0x0CU // K-state instead of response, usually indicates wrong speed
+#define                           UHS_HOST_ERROR_JERR 0x0DU // J-state instead of response, usually indicates wrong speed
+#define                        UHS_HOST_ERROR_TIMEOUT 0x0EU // Device did not respond in time
+#define                         UHS_HOST_ERROR_BABBLE 0x0FU // Line noise/unexpected data
+#define                        UHS_HOST_ERROR_MEM_LAT 0x10U // Error caused by memory latency.
+#define                           UHS_HOST_ERROR_NYET 0x11U // OUT transfer accepted with NYET
+
+// Addressing error codes
+#define                      ADDR_ERROR_INVALID_INDEX 0xA0U
+#define                    ADDR_ERROR_INVALID_ADDRESS 0xA1U
+
+// Common Interface Driver error codes
+#define           UHS_HOST_ERROR_DEVICE_NOT_SUPPORTED 0xD1U // Driver doesn't support the device or interfaces
+#define         UHS_HOST_ERROR_DEVICE_INIT_INCOMPLETE 0xD2U // Init partially finished, but died.
+#define     UHS_HOST_ERROR_CANT_REGISTER_DEVICE_CLASS 0xD3U // There was no driver for the interface requested.
+#define              UHS_HOST_ERROR_ADDRESS_POOL_FULL 0xD4U // No addresses left in the address pool.
+#define           UHS_HOST_ERROR_HUB_ADDRESS_OVERFLOW 0xD5U // No hub addresses left. The maximum is 7.
+#define             UHS_HOST_ERROR_NO_ADDRESS_IN_POOL 0xD6U // Address was not allocated in the pool, thus not found.
+#define                    UHS_HOST_ERROR_NULL_EPINFO 0xD7U // The supplied endpoint was NULL, indicates a bug or other problem.
+#define                   UHS_HOST_ERROR_BAD_ARGUMENT 0xD8U // Indicates a range violation bug.
+#define             UHS_HOST_ERROR_DEVICE_DRIVER_BUSY 0xD9U // The interface driver is busy or out buffer is full, try again later.
+#define            UHS_HOST_ERROR_BAD_MAX_PACKET_SIZE 0xDAU // The maximum packet size was exceeded. Try again with smaller size.
+#define           UHS_HOST_ERROR_NO_ENDPOINT_IN_TABLE 0xDBU // The endpoint could not be found in the endpoint table.
+#define                      UHS_HOST_ERROR_UNPLUGGED 0xDEU // Someone removed the USB device, or Vbus was turned off.
+#define                          UHS_HOST_ERROR_NOMEM 0xDFU // Out Of Memory.
+
+// Control request stream errors
+#define                UHS_HOST_ERROR_FailGetDevDescr 0xE1U
+#define             UHS_HOST_ERROR_FailSetDevTblEntry 0xE2U
+#define               UHS_HOST_ERROR_FailGetConfDescr 0xE3U
+#define                  UHS_HOST_ERROR_END_OF_STREAM 0xEFU
+
+// Host base class specific Error codes
+#define                UHS_HOST_ERROR_NOT_IMPLEMENTED 0xFEU
+#define               UHS_HOST_ERROR_TRANSFER_TIMEOUT 0xFFU
+
+// SEI interaction defaults
+#define                      UHS_HOST_TRANSFER_MAX_MS 10000 // USB transfer timeout in ms, per section 9.2.6.1 of USB 2.0 spec
+#define               UHS_HOST_TRANSFER_RETRY_MAXIMUM 3     // 3 retry limit for a transfer
+#define                    UHS_HOST_DEBOUNCE_DELAY_MS 500   // settle delay in milliseconds
+#define                        UHS_HUB_RESET_DELAY_MS 20    // hub port reset delay, 10ms recomended, but can be up to 20ms
+
+//
+// We only provide the minimum needed information for enumeration.
+// Interface drivers should be able to set up what is needed with nothing more.
+// A driver needs to know the following information:
+// 1: address on the USB network, parent and port (aka UsbDeviceAddress)
+// 2: endpoints
+// 3: vid:pid, class, subclass, protocol
+//
+
+struct ENDPOINT_INFO {
+        uint8_t bEndpointAddress;       // Endpoint address. Bit 7 indicates direction (0=OUT, 1=IN).
+        uint8_t bmAttributes;           // Endpoint transfer type.
+        uint16_t wMaxPacketSize;        // Maximum packet size.
+        uint8_t bInterval;              // Polling interval in frames.
+} __attribute__((packed));
+
+struct INTERFACE_INFO {
+        uint8_t bInterfaceNumber;
+        uint8_t bAlternateSetting;
+        uint8_t numep;
+        uint8_t klass;
+        uint8_t subklass;
+        uint8_t protocol;
+        ENDPOINT_INFO epInfo[16];
+} __attribute__((packed));
+
+struct ENUMERATION_INFO {
+        uint16_t vid;
+        uint16_t pid;
+        uint16_t bcdDevice;
+        uint8_t klass;
+        uint8_t subklass;
+        uint8_t protocol;
+        uint8_t bMaxPacketSize0;
+        uint8_t currentconfig;
+        uint8_t parent;
+        uint8_t port;
+        uint8_t address;
+        INTERFACE_INFO interface;
+} __attribute__((packed));
+
+/* USB Setup Packet Structure   */
+typedef struct {
+        // offset   description
+        //   0      Bit-map of request type
+         union {
+                uint8_t bmRequestType;
+
+                struct {
+                        uint8_t recipient : 5;  // Recipient of the request
+                        uint8_t type : 2;       // Type of request
+                        uint8_t direction : 1;  // Direction of data transfer
+                } __attribute__((packed));
+        } ReqType_u;
+
+        //   1      Request
+        uint8_t bRequest;
+
+        //   2      Depends on bRequest
+        union {
+                uint16_t wValue;
+
+                struct {
+                        uint8_t wValueLo;
+                        uint8_t wValueHi;
+                } __attribute__((packed));
+        } wVal_u;
+        //   4      Depends on bRequest
+        uint16_t wIndex;
+        //   6      Depends on bRequest
+        uint16_t wLength;
+        // 8 bytes total
+} __attribute__((packed)) SETUP_PKT, *PSETUP_PKT;
+
+
+// little endian :-)                                                                             8                                8                          8                         8                          16                      16
+#define mkSETUP_PKT8(bmReqType, bRequest, wValLo, wValHi, wInd, total) ((uint64_t)(((uint64_t)(bmReqType)))|(((uint64_t)(bRequest))<<8)|(((uint64_t)(wValLo))<<16)|(((uint64_t)(wValHi))<<24)|(((uint64_t)(wInd))<<32)|(((uint64_t)(total)<<48)))
+#define mkSETUP_PKT16(bmReqType, bRequest, wVal, wInd, total)          ((uint64_t)(((uint64_t)(bmReqType)))|(((uint64_t)(bRequest))<<8)|(((uint64_t)(wVal  ))<<16)                           |(((uint64_t)(wInd))<<32)|(((uint64_t)(total)<<48)))
+
+// Big endian -- but we aren't able to use this :-/
+//#define mkSETUP_PKT8(bmReqType, bRequest, wValLo, wValHi, wInd, total) ((uint64_t)(((uint64_t)(bmReqType))<<56)|(((uint64_t)(bRequest))<<48)|(((uint64_t)(wValLo))<<40)|(((uint64_t)(wValHi))<<32)|(((uint64_t)(wInd))<<16)|((uint64_t)(total)))
+//#define mkSETUP_PKT16(bmReqType, bRequest, wVal, wInd, total)          ((uint64_t)(((uint64_t)(bmReqType))<<56)|(((uint64_t)(bRequest))<<48)                           |(((uint64_t)(wVal))<<32)  |(((uint64_t)(wInd))<<16)|((uint64_t)(total)))
+
+#endif /* USBCORE_H */

Marlin/src/sd/usb_flashdrive/lib-uhs3/UHS_host/UHS_address.h

@@ -0,0 +1,248 @@
+/* Copyright (C) 2015-2016 Andrew J. Kroll
+   and
+Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web      :  http://www.circuitsathome.com
+e-mail   :  support@circuitsathome.com
+ */
+
+#if !defined(_UHS_host_h_) || defined(__ADDRESS_H__)
+#error "Never include UHS_address.h directly; include UHS_Usb.h instead"
+#else
+#define __ADDRESS_H__
+
+
+
+/* NAK powers. To save space in endpoint data structure, amount of retries before giving up and returning 0x4 is stored in */
+/* bmNakPower as a power of 2. The actual nak_limit is then calculated as nak_limit = ( 2^bmNakPower - 1) */
+#define UHS_USB_NAK_MAX_POWER               14      // NAK binary order maximum value
+#define UHS_USB_NAK_DEFAULT                 13      // default 16K-1 NAKs before giving up
+#define UHS_USB_NAK_NOWAIT                  1       // Single NAK stops transfer
+#define UHS_USB_NAK_NONAK                   0       // Do not count NAKs, stop retrying after USB Timeout. Try not to use this.
+
+#define bmUSB_DEV_ADDR_PORT             0x07
+#define bmUSB_DEV_ADDR_PARENT           0x78
+#define bmUSB_DEV_ADDR_HUB              0x40
+
+// TODO: embed parent?
+struct UHS_EpInfo {
+        uint8_t epAddr; // Endpoint address
+        uint8_t bIface;
+        uint16_t maxPktSize; // Maximum packet size
+
+        union {
+                uint8_t epAttribs;
+
+                struct {
+                        uint8_t bmSndToggle : 1; // Send toggle, when zero bmSNDTOG0, bmSNDTOG1 otherwise
+                        uint8_t bmRcvToggle : 1; // Send toggle, when zero bmRCVTOG0, bmRCVTOG1 otherwise
+                        uint8_t bmNeedPing : 1; // 1 == ping protocol needed for next out packet
+                        uint8_t bmNakPower : 5; // Binary order for NAK_LIMIT value
+                } __attribute__((packed));
+        };
+} __attribute__((packed));
+
+// TODO: embed parent address and port into epinfo struct,
+// and nuke this address stupidity.
+// This is a compact scheme. Should also support full spec.
+// This produces a 7 hub limit, 49 devices + 7 hubs, 56 total.
+//
+//    7   6   5   4   3   2   1   0
+//  ---------------------------------
+//  |   | H | P | P | P | A | A | A |
+//  ---------------------------------
+//
+// H - if 1 the address is a hub address
+// P - parent hub number
+// A - port number of parent
+//
+
+struct UHS_DeviceAddress {
+
+        union {
+
+                struct {
+                        uint8_t bmAddress : 3; // port number
+                        uint8_t bmParent : 3; // parent hub address
+                        uint8_t bmHub : 1; // hub flag
+                        uint8_t bmReserved : 1; // reserved, must be zero
+                } __attribute__((packed));
+                uint8_t devAddress;
+        };
+} __attribute__((packed));
+
+struct UHS_Device {
+        volatile UHS_EpInfo *epinfo[UHS_HOST_MAX_INTERFACE_DRIVERS]; // endpoint info pointer
+        UHS_DeviceAddress address;
+        uint8_t epcount; // number of endpoints
+        uint8_t speed; // indicates device speed
+} __attribute__((packed));
+
+typedef void (*UsbDeviceHandleFunc)(UHS_Device *pdev);
+
+class AddressPool {
+        UHS_EpInfo dev0ep; //Endpoint data structure used during enumeration for uninitialized device
+
+        // In order to avoid hub address duplication, this should use bits
+        uint8_t hubCounter; // hub counter
+
+        UHS_Device thePool[UHS_HOST_MAX_INTERFACE_DRIVERS];
+
+        // Initializes address pool entry
+
+        void UHS_NI InitEntry(uint8_t index) {
+                thePool[index].address.devAddress = 0;
+                thePool[index].epcount = 1;
+                thePool[index].speed = 0;
+                for(uint8_t i = 0; i < UHS_HOST_MAX_INTERFACE_DRIVERS; i++) {
+                        thePool[index].epinfo[i] = &dev0ep;
+                }
+        };
+
+        // Returns thePool index for a given address
+
+        uint8_t UHS_NI FindAddressIndex(uint8_t address = 0) {
+                for(uint8_t i = 1; i < UHS_HOST_MAX_INTERFACE_DRIVERS; i++) {
+                        if(thePool[i].address.devAddress == address)
+                                return i;
+                }
+                return 0;
+        };
+
+        // Returns thePool child index for a given parent
+
+        uint8_t UHS_NI FindChildIndex(UHS_DeviceAddress addr, uint8_t start = 1) {
+                for(uint8_t i = (start < 1 || start >= UHS_HOST_MAX_INTERFACE_DRIVERS) ? 1 : start; i < UHS_HOST_MAX_INTERFACE_DRIVERS; i++) {
+                        if(thePool[i].address.bmParent == addr.bmAddress)
+                                return i;
+                }
+                return 0;
+        };
+
+        // Frees address entry specified by index parameter
+
+        void UHS_NI FreeAddressByIndex(uint8_t index) {
+                // Zero field is reserved and should not be affected
+                if(index == 0)
+                        return;
+
+                UHS_DeviceAddress uda = thePool[index].address;
+                // If a hub was switched off all port addresses should be freed
+                if(uda.bmHub == 1) {
+                        for(uint8_t i = 1; (i = FindChildIndex(uda, i));)
+                                FreeAddressByIndex(i);
+
+                        // FIXME: use BIT MASKS
+                        // If the hub had the last allocated address, hubCounter should be decremented
+                        if(hubCounter == uda.bmAddress)
+                                hubCounter--;
+                }
+                InitEntry(index);
+        }
+
+        void InitAllAddresses(void) {
+                for(uint8_t i = 1; i < UHS_HOST_MAX_INTERFACE_DRIVERS; i++) InitEntry(i);
+                hubCounter = 0;
+        };
+public:
+
+        AddressPool() {
+                hubCounter = 0;
+                // Zero address is reserved
+                InitEntry(0);
+
+                thePool[0].epinfo[0] = &dev0ep;
+                dev0ep.epAddr = 0;
+#if UHS_DEVICE_WINDOWS_USB_SPEC_VIOLATION_DESCRIPTOR_DEVICE
+                dev0ep.maxPktSize = 0x40; //starting at 0x40 and work down
+#else
+                dev0ep.maxPktSize = 0x08;
+#endif
+                dev0ep.epAttribs = 0; //set DATA0/1 toggles to 0
+                dev0ep.bmNakPower = UHS_USB_NAK_MAX_POWER;
+                InitAllAddresses();
+        };
+
+        // Returns a pointer to a specified address entry
+
+        UHS_Device* UHS_NI GetUsbDevicePtr(uint8_t addr) {
+                if(!addr)
+                        return thePool;
+
+                uint8_t index = FindAddressIndex(addr);
+
+                return (!index) ? NULL : &thePool[index];
+        };
+
+
+        // Allocates new address
+
+        uint8_t UHS_NI AllocAddress(uint8_t parent, bool is_hub = false, uint8_t port = 1) {
+                /* if (parent != 0 && port == 0)
+                        USB_HOST_SERIAL.println("PRT:0"); */
+                UHS_DeviceAddress _parent;
+                _parent.devAddress = parent;
+                if(_parent.bmReserved || port > 7)
+                        //if(parent > 127 || port > 7)
+                        return 0;
+
+                // FIXME: use BIT MASKS
+                if(is_hub && hubCounter == 7)
+                        return 0;
+
+                // finds first empty address entry starting from one
+                uint8_t index = FindAddressIndex(0);
+
+                if(!index) // if empty entry is not found
+                        return 0;
+
+                UHS_DeviceAddress addr;
+                addr.devAddress = port;
+                addr.bmParent = _parent.bmAddress;
+
+                // FIXME: use BIT MASKS
+                if(is_hub) {
+                        hubCounter++;
+                        addr.bmHub = 1;
+                        addr.bmAddress = hubCounter;
+                }
+                thePool[index].address = addr;
+#if DEBUG_PRINTF_EXTRA_HUGE
+#if defined(UHS_DEBUG_USB_ADDRESS)
+                printf("Address: %x (%x.%x.%x)\r\n", addr.devAddress, addr.bmHub, addr.bmParent, addr.bmAddress);
+#endif
+#endif
+                return thePool[index].address.devAddress;
+        };
+
+        void UHS_NI FreeAddress(uint8_t addr) {
+                // if the root hub is disconnected all the addresses should be initialized
+                if(addr == 0x41) {
+                        InitAllAddresses();
+                        return;
+                }
+                uint8_t index = FindAddressIndex(addr);
+                FreeAddressByIndex(index);
+        };
+
+};
+
+#endif // __ADDRESS_H__

Marlin/src/sd/usb_flashdrive/lib-uhs3/UHS_host/UHS_hexdump.h

@@ -0,0 +1,70 @@
+/* Copyright (C) 2015-2016 Andrew J. Kroll
+   and
+Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web      :  http://www.circuitsathome.com
+e-mail   :  support@circuitsathome.com
+ */
+#if !defined(_usb_h_) || defined(__HEXDUMP_H__)
+#error "Never include UHS_hexdump.h directly; include UHS_Usb.h instead"
+#else
+#define __HEXDUMP_H__
+
+extern int UsbDEBUGlvl;
+
+template <class BASE_CLASS, class LEN_TYPE, class OFFSET_TYPE>
+class HexDumper : public BASE_CLASS {
+        uint8_t byteCount;
+        OFFSET_TYPE byteTotal;
+
+public:
+
+        HexDumper() : byteCount(0), byteTotal(0) {
+        };
+
+        void Initialize(void) {
+                byteCount = 0;
+                byteTotal = 0;
+        };
+
+        virtual void Parse(const LEN_TYPE len, const uint8_t *pbuf, const OFFSET_TYPE &offset);
+};
+
+template <class BASE_CLASS, class LEN_TYPE, class OFFSET_TYPE>
+void HexDumper<BASE_CLASS, LEN_TYPE, OFFSET_TYPE>::Parse(const LEN_TYPE len, const uint8_t *pbuf, const OFFSET_TYPE &offset) {
+        if(UsbDEBUGlvl >= 0x80) { // Fully bypass this block of code if we do not debug.
+                for(LEN_TYPE j = 0; j < len; j++, byteCount++, byteTotal++) {
+                        if(!byteCount) {
+                                PrintHex<OFFSET_TYPE > (byteTotal, 0x80);
+                                E_Notify(PSTR(": "), 0x80);
+                        }
+                        PrintHex<uint8_t > (pbuf[j], 0x80);
+                        E_Notify(PSTR(" "), 0x80);
+
+                        if(byteCount == 15) {
+                                E_Notify(PSTR("\r\n"), 0x80);
+                                byteCount = 0xFF;
+                        }
+                }
+        }
+}
+
+#endif // __HEXDUMP_H__

Marlin/src/sd/usb_flashdrive/lib-uhs3/UHS_host/UHS_host.h

@@ -0,0 +1,111 @@
+/* Copyright (C) 2015-2016 Andrew J. Kroll
+   and
+Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web      :  http://www.circuitsathome.com
+e-mail   :  support@circuitsathome.com
+ */
+/* USB functions */
+#ifndef _UHS_host_h_
+#define _UHS_host_h_
+
+// WARNING: Do not change the order of includes, or stuff will break!
+#include <inttypes.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdint.h>
+
+#if DISABLED(USE_UHS3_USB)
+#include <ISR_safe_memory.h>
+#include <Wire.h>
+#include <SPI.h>
+#include <UHS_ByteBuffer.h>
+#endif
+#include "UHS_macros.h"
+
+// None of these should ever be directly included by a driver, or a user's sketch.
+#include "../dyn_SWI/dyn_SWI.h"
+#include "UHS_USB_IDs.h"
+#include "UHS_settings.h"
+#include "UHS_usb_ch9.h"
+#include "UHS_UsbCore.h"
+#include "UHS_address.h"
+#include "UHS_usbhost.h"
+#include "UHS_printhex.h"
+#include "UHS_message.h"
+
+// Load system components as required
+#if defined(LOAD_USB_HOST_SYSTEM) && !defined(USB_HOST_SYSTEM_LOADED)
+#include "UHS_util_INLINE.h"
+#include "UHS_host_INLINE.h"
+#include "UHS_printf_HELPER.h"
+
+#if defined(LOAD_USB_HOST_SHIELD)
+#include "USB_HOST_SHIELD/USB_HOST_SHIELD.h"
+#endif
+
+#if defined(LOAD_UHS_KINETIS_FS_HOST) && !defined(UHS_KINETIS_FS_HOST_LOADED)
+#include "UHS_KINETIS_FS_HOST/UHS_KINETIS_FS_HOST.h"
+#endif
+
+#if defined(LOAD_UHS_KINETIS_EHCI) && !defined(UHS_KINETIS_EHCI_LOADED)
+#include "UHS_KINETIS_EHCI/UHS_KINETIS_EHCI.h"
+#endif
+
+// Load USB drivers and multiplexers
+
+#if defined(LOAD_UHS_HUB)
+#include "UHS_HUB/UHS_HUB.h"
+#endif // HUB loaded
+
+#if defined(LOAD_UHS_BULK_STORAGE)
+#include "UHS_BULK_STORAGE/UHS_BULK_STORAGE.h"
+#endif
+
+#if defined(LOAD_GENERIC_STORAGE)
+#include "../UHS_FS/UHS_FS.h"
+#endif
+// Add BT and optionally HID if directed to do so
+#if defined(LOAD_UHS_BT)
+#include "UHS_BT/UHS_BT.h"
+#endif // BT and optionally HID loaded
+
+// Add HID
+#if defined(LOAD_UHS_HID)
+#include "UHS_HID/UHS_HID.h"
+#endif // HID loaded
+
+// Add CDC multiplexers (currently only ACM)
+#if defined(LOAD_UHS_CDC_ACM) || defined(LOAD_UHS_CDC_ACM_FTDI) || defined(LOAD_UHS_CDC_ACM_PROLIFIC) || defined(LOAD_UHS_CDC_ACM_XR21B1411)
+#include "UHS_CDC/UHS_CDC.h"
+#endif // CDC loaded
+
+#if defined(LOAD_UHS_ADK)
+#include "UHS_ADK/UHS_ADK.h"
+#endif
+
+#if defined(LOAD_UHS_MIDI)
+#include "UHS_MIDI/UHS_MIDI.h"
+#endif
+
+#endif // System code loaded
+
+#endif // _UHS_host_h_

Marlin/src/sd/usb_flashdrive/lib-uhs3/UHS_host/UHS_macros.h

@@ -0,0 +1,393 @@
+/* Copyright (C) 2015-2016 Andrew J. Kroll
+   and
+Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web      :  http://www.circuitsathome.com
+e-mail   :  support@circuitsathome.com
+ */
+
+#if !defined(MACROS_H)
+#define MACROS_H
+#include "macro_logic.h"
+/*
+ * Universal Arduino(tm) "IDE" fixups.
+ */
+
+
+// Just in case...
+#ifndef SERIAL_PORT_MONITOR
+#define SERIAL_PORT_MONITOR Serial
+#endif
+
+#ifndef INT16_MIN
+#define INT16_MIN -32768
+#endif
+// require 10607+
+#if defined(ARDUINO) && ARDUINO >=10607
+// nop :-)
+#else
+#error "Arduino version too old, and must be at least 1.6.7"
+#endif
+
+// Nuke screwed up macro junk from the IDE.
+#ifdef __cplusplus
+#if defined(true)
+#undef true
+#endif
+#if defined(false)
+#undef false
+#endif
+#endif
+
+
+#if !defined(UHS_DEVICE_WINDOWS_USB_SPEC_VIOLATION_DESCRIPTOR_DEVICE)
+
+#if !defined(UHS_BIG_FLASH)
+
+#if defined(FLASHEND) && defined(FLASHSTART)
+#if (FLASHEND - FLASHSTART) > 0x0FFFFU
+#define UHS_BIG_FLASH 1
+#else
+#define UHS_BIG_FLASH 0
+#endif
+
+#elif defined(__PIC32_FLASH_SIZE)
+#if __PIC32_FLASH_SIZE > 511
+#define UHS_BIG_FLASH 1
+#else
+#define UHS_BIG_FLASH 0
+#endif
+
+#elif defined(FLASHEND) && !defined(FLASHSTART)
+// Assumes flash starts at 0x00000, is this a safe assumption?
+// 192K + should be OK
+#if FLASHEND > 0x02FFFFU
+#define UHS_BIG_FLASH 1
+#else
+#define UHS_BIG_FLASH 0
+#endif
+
+#elif defined(IFLASH_SIZE)
+#if IFLASH_SIZE > 0x0FFFFU
+#define UHS_BIG_FLASH 1
+#else
+#define UHS_BIG_FLASH 0
+#endif
+
+#elif defined(ESP8266)
+#define UHS_BIG_FLASH 1
+#define SYSTEM_OR_SPECIAL_YIELD(...) yield()
+
+#elif defined(__arm__) && defined(CORE_TEENSY)
+#define UHS_BIG_FLASH 1
+
+#elif defined(ARDUINO_spresense_ast)
+#define UHS_BIG_FLASH 1
+#else
+// safe default
+#warning Small flash?
+#define UHS_BIG_FLASH 0
+#endif
+#endif
+
+#if UHS_BIG_FLASH
+#define UHS_DEVICE_WINDOWS_USB_SPEC_VIOLATION_DESCRIPTOR_DEVICE 1
+#else
+#define UHS_DEVICE_WINDOWS_USB_SPEC_VIOLATION_DESCRIPTOR_DEVICE 0
+#endif
+#endif
+
+#if defined(__arm__) && defined(CORE_TEENSY)
+#define UHS_PIN_WRITE(p, v) digitalWriteFast(p, v)
+#define UHS_PIN_READ(p) digitalReadFast(p)
+#endif
+// TODO: Fast inline code for AVR and SAM based microcontrollers
+//       This can be done pretty easily.
+//       For now, this will just work out-of-the-box.
+#if !defined(UHS_PIN_WRITE)
+#define UHS_PIN_WRITE(p, v) digitalWrite(p, v)
+#endif
+#if !defined(UHS_PIN_READ)
+#define UHS_PIN_READ(p) digitalRead(p)
+#endif
+
+#if defined( __PIC32MX__ ) && !defined(interrupts) // compiling with Microchip XC32 compiler
+#define interrupts() __builtin_enable_interrupts()
+#edfine noInterrupts() __builtin_disable_interrupts()
+#endif
+
+#if !defined(ARDUINO_SAMD_ZERO)
+#if defined(ARDUINO_AVR_ADK)
+#define UHS_GET_DPI(x) (x == 54 ? 6 : digitalPinToInterrupt(x))
+#else
+#define UHS_GET_DPI(x) digitalPinToInterrupt(x)
+#endif
+#else
+#define UHS_GET_DPI(x) (x)
+#endif
+
+#ifndef __AVR__
+#ifndef __PGMSPACE_H_
+// This define should prevent reading the system pgmspace.h if included elsewhere
+// This is not normally needed.
+#define __PGMSPACE_H_ 1
+#endif
+
+#ifndef PROGMEM
+#define PROGMEM
+#endif
+#ifndef PGM_P
+#define PGM_P  const char *
+#endif
+#ifndef PSTR
+#define PSTR(str) (str)
+#endif
+#ifndef F
+#define F(str) (str)
+#endif
+#ifndef _SFR_BYTE
+#define _SFR_BYTE(n) (n)
+#endif
+#ifndef memchr_P
+#define memchr_P(str, c, len) memchr((str), (c), (len))
+#endif
+#ifndef memcmp_P
+#define memcmp_P(a, b, n) memcmp((a), (b), (n))
+#endif
+#ifndef memcpy_P
+#define memcpy_P(dest, src, num) memcpy((dest), (src), (num))
+#endif
+#ifndef memmem_P
+#define memmem_P(a, alen, b, blen) memmem((a), (alen), (b), (blen))
+#endif
+#ifndef memrchr_P
+#define memrchr_P(str, val, len) memrchr((str), (val), (len))
+#endif
+#ifndef strcat_P
+#define strcat_P(dest, src) strcat((dest), (src))
+#endif
+#ifndef strchr_P
+#define strchr_P(str, c) strchr((str), (c))
+#endif
+#ifndef strchrnul_P
+#define strchrnul_P(str, c) strchrnul((str), (c))
+#endif
+#ifndef strcmp_P
+#define strcmp_P(a, b) strcmp((a), (b))
+#endif
+#ifndef strcpy_P
+#define strcpy_P(dest, src) strcpy((dest), (src))
+#endif
+#ifndef strcasecmp_P
+#define strcasecmp_P(a, b) strcasecmp((a), (b))
+#endif
+#ifndef strcasestr_P
+#define strcasestr_P(a, b) strcasestr((a), (b))
+#endif
+#ifndef strlcat_P
+#define strlcat_P(dest, src, len) strlcat((dest), (src), (len))
+#endif
+#ifndef strlcpy_P
+#define strlcpy_P(dest, src, len) strlcpy((dest), (src), (len))
+#endif
+#ifndef strlen_P
+#define strlen_P(s) strlen((const char *)(s))
+#endif
+#ifndef strnlen_P
+#define strnlen_P(str, len) strnlen((str), (len))
+#endif
+#ifndef strncmp_P
+#define strncmp_P(a, b, n) strncmp((a), (b), (n))
+#endif
+#ifndef strncasecmp_P
+#define strncasecmp_P(a, b, n) strncasecmp((a), (b), (n))
+#endif
+#ifndef strncat_P
+#define strncat_P(a, b, n) strncat((a), (b), (n))
+#endif
+#ifndef strncpy_P
+#define strncpy_P(a, b, n) strncmp((a), (b), (n))
+#endif
+#ifndef strpbrk_P
+#define strpbrk_P(str, chrs) strpbrk((str), (chrs))
+#endif
+#ifndef strrchr_P
+#define strrchr_P(str, c) strrchr((str), (c))
+#endif
+#ifndef strsep_P
+#define strsep_P(strp, delim) strsep((strp), (delim))
+#endif
+#ifndef strspn_P
+#define strspn_P(str, chrs) strspn((str), (chrs))
+#endif
+#ifndef strstr_P
+#define strstr_P(a, b) strstr((a), (b))
+#endif
+#ifndef sprintf_P
+#define sprintf_P(s, ...) sprintf((s), __VA_ARGS__)
+#endif
+#ifndef vfprintf_P
+#define vfprintf_P(s, ...) vfprintf((s), __VA_ARGS__)
+#endif
+#ifndef printf_P
+#define printf_P(...) printf(__VA_ARGS__)
+#endif
+#ifndef snprintf_P
+#define snprintf_P(s, n, ...) ((s), (n), __VA_ARGS__)
+#endif
+#ifndef vsprintf_P
+#define vsprintf_P(s, ...) ((s),__VA_ARGS__)
+#endif
+#ifndef vsnprintf_P
+#define vsnprintf_P(s, n, ...) ((s), (n),__VA_ARGS__)
+#endif
+#ifndef fprintf_P
+#define fprintf_P(s, ...) ((s), __VA_ARGS__)
+#endif
+
+#ifndef pgm_read_byte
+#define pgm_read_byte(addr) (*(const unsigned char *)(addr))
+#endif
+#ifndef pgm_read_word
+#define pgm_read_word(addr) (*(const unsigned short *)(addr))
+#endif
+#ifndef pgm_read_dword
+#define pgm_read_dword(addr) (*(const unsigned long *)(addr))
+#endif
+#ifndef pgm_read_float
+#define pgm_read_float(addr) (*(const float *)(addr))
+#endif
+
+#ifndef pgm_read_byte_near
+#define pgm_read_byte_near(addr) pgm_read_byte(addr)
+#endif
+#ifndef pgm_read_word_near
+#define pgm_read_word_near(addr) pgm_read_word(addr)
+#endif
+#ifndef pgm_read_dword_near
+#define pgm_read_dword_near(addr) pgm_read_dword(addr)
+#endif
+#ifndef pgm_read_float_near
+#define pgm_read_float_near(addr) pgm_read_float(addr)
+#endif
+#ifndef pgm_read_byte_far
+#define pgm_read_byte_far(addr) pgm_read_byte(addr)
+#endif
+#ifndef pgm_read_word_far
+#define pgm_read_word_far(addr) pgm_read_word(addr)
+#endif
+#ifndef pgm_read_dword_far
+#define pgm_read_dword_far(addr) pgm_read_dword(addr)
+#endif
+#ifndef pgm_read_float_far
+#define pgm_read_float_far(addr) pgm_read_float(addr)
+#endif
+
+#ifndef pgm_read_pointer
+#define pgm_read_pointer
+#endif
+
+#endif
+
+
+////////////////////////////////////////////////////////////////////////////////
+// HANDY MACROS
+////////////////////////////////////////////////////////////////////////////////
+
+// Atmoically set/clear single bits using bitbands.
+// Believe it or not, this boils down to a constant,
+// and is less code than using |= &= operators.
+// Bonus, it makes code easier to read too.
+// Bitbanding is a wonderful thing.
+#define BITNR(i) (i&0x1?0:i&0x2?1:i&0x4?2:i&0x8?3:i&0x10?4:i&0x20?5:i&0x40?6:i&0x80?7:i&0x100?8:i&0x200?9:i&0x400?10:i&0x800?11:i&0x1000?12:i&0x2000?13:i&0x4000?14:i&0x8000?15:i&0x10000?16:i&0x20000?17:i&0x40000?18:i&0x80000?19:i&0x100000?20:i&0x200000?21:i&0x400000?22:i&0x800000?23:i&0x1000000?24:i&0x2000000?25:i&0x4000000?26:i&0x8000000?27:i&0x10000000?28:i&0x20000000?29:i&0x40000000?30:i&0x80000000?31:32)
+#define UHS_KIO_BITBAND_ADDR(r, i) (((uint32_t)&(r) - 0x40000000) * 32 + (i) * 4 + 0x42000000)
+#define UHS_KIO_SETBIT_ATOMIC(r, m) (*(uint32_t *)UHS_KIO_BITBAND_ADDR((r), BITNR((m)))) = 1
+#define UHS_KIO_CLRBIT_ATOMIC(r, m) (*(uint32_t *)UHS_KIO_BITBAND_ADDR((r), BITNR((m)))) = 0
+
+
+#define VALUE_BETWEEN(v,l,h) (((v)>(l)) && ((v)<(h)))
+#define VALUE_WITHIN(v,l,h) (((v)>=(l)) && ((v)<=(h)))
+#define output_pgm_message(wa,fp,mp,el) wa = &mp, fp((char *)pgm_read_pointer(wa), el)
+#define output_if_between(v,l,h,wa,fp,mp,el) if(VALUE_BETWEEN(v,l,h)) output_pgm_message(wa,fp,mp[v-(l+1)],el);
+
+#define UHS_SWAP_VALUES(a, b) (((a) ^= (b)), ((b) ^= (a)), ((a) ^= (b)))
+#ifndef __BYTE_GRABBING_DEFINED__
+#define __BYTE_GRABBING_DEFINED__ 1
+#ifdef BROKEN_OPTIMIZER_LITTLE_ENDIAN
+// Note: Use this if your compiler generates horrible assembler!
+#define UHS_UINT8_BYTE0(__usi__)  (((uint8_t *)&(__usi__))[0])
+#define UHS_UINT8_BYTE1(__usi__)  (((uint8_t *)&(__usi__))[1])
+#define UHS_UINT8_BYTE2(__usi__)  (((uint8_t *)&(__usi__))[2])
+#define UHS_UINT8_BYTE3(__usi__)  (((uint8_t *)&(__usi__))[3])
+#define UHS_UINT8_BYTE4(__usi__)  (((uint8_t *)&(__usi__))[4])
+#define UHS_UINT8_BYTE5(__usi__)  (((uint8_t *)&(__usi__))[5])
+#define UHS_UINT8_BYTE6(__usi__)  (((uint8_t *)&(__usi__))[6])
+#define UHS_UINT8_BYTE7(__usi__)  (((uint8_t *)&(__usi__))[7])
+#else
+// Note: The cast alone to uint8_t is actually enough.
+// GCC throws out the "& 0xff", and the size is no different.
+// Some compilers need it.
+#define UHS_UINT8_BYTE0(__usi__)  ((uint8_t)((__usi__) & 0xff ))
+#define UHS_UINT8_BYTE1(__usi__)  ((uint8_t)(((__usi__) >> 8) & 0xff))
+#define UHS_UINT8_BYTE2(__usi__)  ((uint8_t)(((__usi__) >> 16) & 0xff))
+#define UHS_UINT8_BYTE3(__usi__)  ((uint8_t)(((__usi__) >> 24) & 0xff))
+#define UHS_UINT8_BYTE4(__usi__)  ((uint8_t)(((__usi__) >> 32) & 0xff))
+#define UHS_UINT8_BYTE5(__usi__)  ((uint8_t)(((__usi__) >> 40) & 0xff))
+#define UHS_UINT8_BYTE6(__usi__)  ((uint8_t)(((__usi__) >> 48) & 0xff))
+#define UHS_UINT8_BYTE7(__usi__)  ((uint8_t)(((__usi__) >> 56) & 0xff))
+#endif
+#define UHS_UINT16_SET_BYTE1(__usi__)  ((uint16_t)(__usi__) << 8)
+#define UHS_UINT32_SET_BYTE1(__usi__)  ((uint32_t)(__usi__) << 8)
+#define UHS_UINT64_SET_BYTE1(__usi__)  ((uint64_t)(__usi__) << 8)
+#define UHS_UINT32_SET_BYTE2(__usi__)  ((uint32_t)(__usi__) << 16)
+#define UHS_UINT64_SET_BYTE2(__usi__)  ((uint64_t)(__usi__) << 16)
+#define UHS_UINT32_SET_BYTE3(__usi__)  ((uint32_t)(__usi__) << 24)
+#define UHS_UINT64_SET_BYTE3(__usi__)  ((uint64_t)(__usi__) << 24)
+#define UHS_UINT64_SET_BYTE4(__usi__)  ((uint64_t)(__usi__) << 32)
+#define UHS_UINT64_SET_BYTE5(__usi__)  ((uint64_t)(__usi__) << 40)
+#define UHS_UINT64_SET_BYTE6(__usi__)  ((uint64_t)(__usi__) << 48)
+#define UHS_UINT64_SET_BYTE7(__usi__)  ((uint64_t)(__usi__) << 56)
+
+// These are the smallest and fastest ways I have found so far in pure C/C++.
+#define UHS_BYTES_TO_UINT16(__usc1__,__usc0__) ((uint16_t)((uint16_t)(__usc0__) | (uint16_t)UHS_UINT16_SET_BYTE1(__usc1__)))
+#define UHS_BYTES_TO_UINT32(__usc3__,__usc2__,__usc1__,__usc0__) ((uint32_t)((uint32_t)(__usc0__) | UHS_UINT32_SET_BYTE1(__usc1__) | UHS_UINT32_SET_BYTE2(__usc2__) | UHS_UINT32_SET_BYTE3(__usc3__)))
+#define UHS_BYTES_TO_UINT64(__usc7__,__usc6__,__usc5__,__usc4__,__usc3__,__usc2__,__usc1__,__usc0__) ((uint64_t)((uint64_t)__usc0__ | UHS_UINT64_SET_BYTE1(__usc1__) | UHS_UINT64_SET_BYTE2(__usc2__) | UHS_UINT64_SET_BYTE3(__usc3__) | UHS_UINT64_SET_BYTE4(__usc4__) | UHS_UINT64_SET_BYTE5(__usc5__) | UHS_UINT64_SET_BYTE6(__usc6__) | UHS_UINT64_SET_BYTE7(__usc7__)))
+#endif
+/*
+ * Debug macros.
+ * Useful when porting from UHS2.
+ * Do not use these for any new code.
+ * Change to better debugging after port is completed.
+ * Strings are stored in progmem (flash) instead of RAM.
+ */
+#define USBTRACE1(s,l) (Notify(PSTR(s), l))
+#define USBTRACE(s) (USBTRACE1((s), 0x80)); USB_HOST_SERIAL.flush()
+#define USBTRACE3(s,r,l) (Notify(PSTR(s), l), D_PrintHex((r), l), Notify(PSTR("\r\n"), l))
+#define USBTRACE3X(s,r,l) (Notify(PSTR(s), l), D_PrintHex((r), l))
+#define USBTRACE2(s,r) (USBTRACE3((s),(r),0x80)); USB_HOST_SERIAL.flush()
+#define USBTRACE2X(s,r) (USBTRACE3X((s),(r),0x80)); USB_HOST_SERIAL.flush()
+
+#define VOID0 ((void)0)
+#if !defined(NOTUSED)
+#define NOTUSED(...)  __VA_ARGS__ __attribute__((unused))
+#endif
+#endif /* MACROS_H */
+

Marlin/src/sd/usb_flashdrive/lib-uhs3/UHS_host/UHS_message.h

@@ -0,0 +1,91 @@
+/* Copyright (C) 2015-2016 Andrew J. Kroll
+   and
+Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web      :  http://www.circuitsathome.com
+e-mail   :  support@circuitsathome.com
+ */
+#if !defined(_UHS_host_h_) || defined(__MESSAGE_H__)
+#error "Never include UHS_message.h directly; include UHS_Usb.h instead"
+#else
+#define __MESSAGE_H__
+
+extern int UsbDEBUGlvl;
+
+void E_Notify(char const * msg, int lvl);
+void E_Notify(uint8_t b, int lvl);
+void E_NotifyStr(char const * msg, int lvl);
+void E_Notifyc(char c, int lvl);
+
+#ifdef DEBUG_USB_HOST
+#define Notify E_Notify
+#define NotifyStr E_NotifyStr
+#define Notifyc E_Notifyc
+void NotifyFailGetDevDescr(uint8_t reason);
+void NotifyFailSetDevTblEntry(uint8_t reason);
+void NotifyFailGetConfDescr(uint8_t reason);
+void NotifyFailSetConfDescr(uint8_t reason);
+void NotifyFailGetDevDescr(void);
+void NotifyFailSetDevTblEntry(void);
+void NotifyFailGetConfDescr(void);
+void NotifyFailSetConfDescr(void);
+void NotifyFailUnknownDevice(uint16_t VID, uint16_t PID);
+void NotifyFail(uint8_t rcode);
+#else
+#define Notify(...) VOID0
+#define NotifyStr(...) VOID0
+#define Notifyc(...) VOID0
+#define NotifyFailGetDevDescr(...) VOID0
+#define NotifyFailSetDevTblEntry(...) VOID0
+#define NotifyFailGetConfDescr(...) VOID0
+#define NotifyFailGetDevDescr(...) VOID0
+#define NotifyFailSetDevTblEntry(...) VOID0
+#define NotifyFailGetConfDescr(...) VOID0
+#define NotifyFailSetConfDescr(...) VOID0
+#define NotifyFailUnknownDevice(...) VOID0
+#define NotifyFail(...) VOID0
+#endif
+
+#ifdef DEBUG_USB_HOST
+template <class ERROR_TYPE> void ErrorMessage(uint8_t level, char const * msg, ERROR_TYPE rcode = 0) {
+        Notify(msg, level);
+        Notify(PSTR(": "), level);
+        D_PrintHex<ERROR_TYPE > (rcode, level);
+        Notify(PSTR("\r\n"), level);
+#else
+template <class ERROR_TYPE> void ErrorMessage(NOTUSED(uint8_t level), NOTUSED(char const * msg), ERROR_TYPE rcode = 0) {
+        (void)rcode;
+#endif
+}
+
+#ifdef DEBUG_USB_HOST
+template <class ERROR_TYPE> void ErrorMessage(char const * msg, ERROR_TYPE rcode = 0) {
+        Notify(msg, 0x80);
+        Notify(PSTR(": "), 0x80);
+        D_PrintHex<ERROR_TYPE > (rcode, 0x80);
+        Notify(PSTR("\r\n"), 0x80);
+#else
+template <class ERROR_TYPE> void ErrorMessage(NOTUSED(char const * msg), ERROR_TYPE rcode = 0) {
+        (void)rcode;
+#endif
+}
+
+#endif // __MESSAGE_H__

Marlin/src/sd/usb_flashdrive/lib-uhs3/UHS_host/UHS_printf_HELPER.h

@@ -0,0 +1,201 @@
+/* Copyright (C) 2015-2016 Andrew J. Kroll
+   and
+Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web      :  http://www.circuitsathome.com
+e-mail   :  support@circuitsathome.com
+ */
+
+#ifndef UHS_PRINTF_HELPER_H
+#define	UHS_PRINTF_HELPER_H
+
+#if defined(LOAD_UHS_PRINTF_HELPER)
+#include <Arduino.h>
+#ifdef true
+#undef true
+#endif
+#ifdef false
+#undef false
+#endif
+
+#if !defined(STDIO_IS_OK_TO_USE_AS_IS)
+#if defined(ARDUINO_SAMD_ZERO) || defined(ARDUINO_SAM_DUE) || defined(ARDUINO_spresense_ast)
+// STDIO patching not required.
+#define STDIO_IS_OK_TO_USE_AS_IS
+#endif
+#endif
+
+#if !defined(STDIO_IS_OK_TO_USE_AS_IS)
+// We need to patch STDIO so it can be used.
+
+#ifndef SERIAL_PORT_MONITOR
+// Some don't define this.
+#define SERIAL_PORT_MONITOR Serial
+#endif
+
+#ifndef SERIAL_PORT_HARDWARE
+// Some don't define this.
+#define SERIAL_PORT_HARDWARE SERIAL_PORT_MONITOR
+#endif
+
+#ifndef USB_HOST_SERIAL
+#if defined(SERIAL_PORT_USBVIRTUAL) && defined(LOAD_UHS_KINETIS_FS_HOST)
+#define USB_HOST_SERIAL SERIAL_PORT_HARDWARE
+#else
+#define USB_HOST_SERIAL SERIAL_PORT_MONITOR
+#endif
+#endif
+
+#if !defined(NOTUSED)
+#define NOTUSED(...)  __VA_ARGS__ __attribute__((unused))
+#endif
+
+#ifndef __AVR__
+#ifndef printf_P
+#define printf_P(...) printf(__VA_ARGS__)
+#endif
+#endif
+
+#if defined(ARDUINO_ARCH_PIC32)
+/*
+ * For printf() output with pic32 Arduino
+ */
+extern "C" {
+
+        void _mon_putc(char s) {
+                USB_HOST_SERIAL.write(s);
+        }
+
+        int _mon_getc() {
+                while(!USB_HOST_SERIAL.available());
+                return USB_HOST_SERIAL.read();
+        }
+}
+
+#elif defined(__AVR__)
+extern "C" {
+
+        static FILE tty_stdio;
+        static FILE tty_stderr;
+
+        static int NOTUSED(tty_stderr_putc(char c, NOTUSED(FILE *t)));
+        static int NOTUSED(tty_stderr_flush(NOTUSED(FILE *t)));
+        static int NOTUSED(tty_std_putc(char c, NOTUSED(FILE *t)));
+        static int NOTUSED(tty_std_getc(NOTUSED(FILE *t)));
+        static int NOTUSED(tty_std_flush(NOTUSED(FILE *t)));
+
+        static int tty_stderr_putc(char c, NOTUSED(FILE *t)) {
+                USB_HOST_SERIAL.write(c);
+                return 0;
+        }
+
+        static int tty_stderr_flush(NOTUSED(FILE *t)) {
+                USB_HOST_SERIAL.flush();
+                return 0;
+        }
+
+        static int tty_std_putc(char c, NOTUSED(FILE *t)) {
+                USB_HOST_SERIAL.write(c);
+                return 0;
+        }
+
+        static int tty_std_getc(NOTUSED(FILE *t)) {
+                while(!USB_HOST_SERIAL.available());
+                return USB_HOST_SERIAL.read();
+        }
+
+        static int tty_std_flush(NOTUSED(FILE *t)) {
+                USB_HOST_SERIAL.flush();
+                return 0;
+        }
+}
+#elif defined(CORE_TEENSY)
+extern "C" {
+
+        int _write(int fd, const char *ptr, int len) {
+                int j;
+                for(j = 0; j < len; j++) {
+                        if(fd == 1)
+                                USB_HOST_SERIAL.write(*ptr++);
+                        else if(fd == 2)
+                                USB_HOST_SERIAL.write(*ptr++);
+                }
+                return len;
+        }
+
+        int _read(int fd, char *ptr, int len) {
+                if(len > 0 && fd == 0) {
+                        while(!USB_HOST_SERIAL.available());
+                        *ptr = USB_HOST_SERIAL.read();
+                        return 1;
+                }
+                return 0;
+        }
+
+#include <sys/stat.h>
+
+        int _fstat(int fd, struct stat *st) {
+                memset(st, 0, sizeof (*st));
+                st->st_mode = S_IFCHR;
+                st->st_blksize = 1024;
+                return 0;
+        }
+
+        int _isatty(int fd) {
+                return (fd < 3) ? 1 : 0;
+        }
+}
+#else
+#error no STDIO
+#endif // defined(ARDUINO_ARCH_PIC32)
+
+
+
+#if defined(__AVR__)
+// The only wierdo in the bunch...
+void UHS_AVR_printf_HELPER_init(void) {
+        // Set up stdio/stderr
+        tty_stdio.put = tty_std_putc;
+        tty_stdio.get = tty_std_getc;
+        tty_stdio.flags = _FDEV_SETUP_RW;
+        tty_stdio.udata = 0;
+
+        tty_stderr.put = tty_stderr_putc;
+        tty_stderr.get = NULL;
+        tty_stderr.flags = _FDEV_SETUP_WRITE;
+        tty_stderr.udata = 0;
+
+        stdout = &tty_stdio;
+        stdin = &tty_stdio;
+        stderr = &tty_stderr;
+
+}
+#define UHS_printf_HELPER_init() UHS_AVR_printf_HELPER_init()
+#endif
+
+#endif /* STDIO_IS_OK_TO_USE_AS_IS */
+#endif  /* load.... */
+
+#if !defined(UHS_printf_HELPER_init)
+#define UHS_printf_HELPER_init() (void(0))
+#endif
+#endif	/* UHS_PRINTF_HELPER_H */
+

Marlin/src/sd/usb_flashdrive/lib-uhs3/UHS_host/UHS_printhex.h

@@ -0,0 +1,96 @@
+/* Copyright (C) 2015-2016 Andrew J. Kroll
+   and
+Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web      :  http://www.circuitsathome.com
+e-mail   :  support@circuitsathome.com
+ */
+
+#if !defined(_UHS_host_h_) || defined(__PRINTHEX_H__)
+#error "Never include UHS_printhex.h directly; include UHS_Usb.h instead"
+#else
+#define __PRINTHEX_H__
+
+void E_Notifyc(char c, int lvl);
+
+template <class T>
+void PrintHex(T val, int lvl) {
+        int num_nibbles = sizeof (T) * 2;
+
+        do {
+                char v = 48 + (((val >> (num_nibbles - 1) * 4)) & 0x0f);
+                if(v > 57) v += 7;
+                E_Notifyc(v, lvl);
+        } while(--num_nibbles);
+}
+
+template <class T>
+void PrintBin(T val, int lvl) {
+        for(T mask = (((T)1) << ((sizeof (T) << 3) - 1)); mask; mask >>= 1)
+                if(val & mask)
+                        E_Notifyc('1', lvl);
+                else
+                        E_Notifyc('0', lvl);
+}
+
+template <class T>
+void SerialPrintHex(T val) {
+        int num_nibbles = sizeof (T) * 2;
+
+        do {
+                char v = 48 + (((val >> (num_nibbles - 1) * 4)) & 0x0f);
+                if(v > 57) v += 7;
+                USB_HOST_SERIAL.print(v);
+        } while(--num_nibbles);
+}
+
+template <class T>
+void PrintHex2(Print *prn, T val) {
+        T mask = (((T)1) << (((sizeof (T) << 1) - 1) << 2));
+
+        while(mask > 1) {
+                if(val < mask)
+                        prn->print("0");
+
+                mask >>= 4;
+        }
+        prn->print((T)val, HEX);
+}
+
+#ifdef DEBUG_USB_HOST
+template <class T> void D_PrintHex(T val, int lvl) {
+        PrintHex<T > (val, lvl);
+#else
+template <class T> void D_PrintHex(NOTUSED(T val), NOTUSED(int lvl)) {
+#endif
+}
+
+#ifdef DEBUG_USB_HOST
+template <class T> void D_PrintBin(T val, int lvl) {
+        PrintBin<T > (val, lvl);
+#else
+template <class T> void D_PrintBin(NOTUSED(T val), NOTUSED(int lvl)) {
+#endif
+}
+
+
+
+#endif // __PRINTHEX_H__

Marlin/src/sd/usb_flashdrive/lib-uhs3/UHS_host/UHS_settings.h

@@ -0,0 +1,141 @@
+/* Copyright (C) 2015-2016 Andrew J. Kroll
+   and
+Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web      :  http://www.circuitsathome.com
+e-mail   :  support@circuitsathome.com
+ */
+
+#ifndef UHS_SETTINGS_H
+#define UHS_SETTINGS_H
+
+// TO-DO: Move specific settings to modules which use them.
+
+////////////////////////////////////////////////////////////////////////////////
+// Define any of these options at the top of your sketch to override
+// the defaults contained herewith. Do NOT do modifications here.
+// Individual Components have their own settings.
+//
+// Macro                        | Settings and notes    | Default
+// -----------------------------+-----------------------+-----------------------
+//                              |  Any class that does  |
+// USB_HOST_SERIAL              |  text streaming       | SERIAL_PORT_MONITOR
+//                              |  e.g. Serial2         |
+// -----------------------------+-----------------------+-----------------------
+// ENABLE_UHS_DEBUGGING         | 0 = off, 1 = on       | 0
+// -----------------------------+-----------------------+-----------------------
+//                              | 0 = off, 1 = on       |
+//                              | Caution! Can make     |
+// DEBUG_PRINTF_EXTRA_HUGE      | program too large!    | 0
+//                              | Other modules depend  |
+//                              | on this setting.      |
+// -----------------------------+-----------------------+-----------------------
+// USE_UHS_BLACK_WIDDOW         | 0 = no, 1 = yes       | 0
+// -----------------------------+-----------------------+-----------------------
+// ENABLE_WII_IR_CAMERA         | 0 = no, 1 = yes       | 0
+// -----------------------------^-----------------------^-----------------------
+//
+////////////////////////////////////////////////////////////////////////////////
+
+
+////////////////////////////////////////////////////////////////////////////////
+// DEBUGGING
+////////////////////////////////////////////////////////////////////////////////
+
+#ifndef USB_HOST_SERIAL
+#if defined(SERIAL_PORT_USBVIRTUAL) && defined(LOAD_UHS_KINETIS_FS_HOST)
+#define USB_HOST_SERIAL SERIAL_PORT_HARDWARE
+#else
+#define USB_HOST_SERIAL SERIAL_PORT_MONITOR
+#endif
+#endif
+
+#ifndef ENABLE_UHS_DEBUGGING
+#define ENABLE_UHS_DEBUGGING 0
+#endif
+
+#ifndef DEBUG_PRINTF_EXTRA_HUGE
+#define DEBUG_PRINTF_EXTRA_HUGE 0
+#endif
+
+////////////////////////////////////////////////////////////////////////////////
+// Manual board activation
+////////////////////////////////////////////////////////////////////////////////
+
+/* Set this to 1 if you are using a Black Widdow */
+#ifndef USE_UHS_BLACK_WIDDOW
+#define USE_UHS_BLACK_WIDDOW 0
+#endif
+
+////////////////////////////////////////////////////////////////////////////////
+// Wii IR camera
+////////////////////////////////////////////////////////////////////////////////
+
+/* Set this to 1 to activate code for the Wii IR camera */
+#ifndef ENABLE_WII_IR_CAMERA
+#define ENABLE_WII_IR_CAMERA 0
+#endif
+
+////////////////////////////////////////////////////////////////////////////////
+// Set to 1 to use the faster spi4teensy3 driver. (not used yet))
+////////////////////////////////////////////////////////////////////////////////
+#ifndef USE_SPI4TEENSY3
+#define USE_SPI4TEENSY3 0
+#endif
+
+////////////////////////////////////////////////////////////////////////////////
+// AUTOMATIC Settings
+////////////////////////////////////////////////////////////////////////////////
+
+// No user serviceable parts below this line.
+// DO NOT change anything below here unless you are a developer!
+
+#if defined(__GNUC__) && defined(__AVR__)
+#ifndef GCC_VERSION
+#define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
+#endif
+#if GCC_VERSION < 40602 // Test for GCC < 4.6.2
+#ifdef PROGMEM
+#undef PROGMEM
+#define PROGMEM __attribute__((section(".progmem.data"))) // Workaround for http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34734#c4
+#ifdef PSTR
+#undef PSTR
+#define PSTR(s) (__extension__({static const char __c[] PROGMEM = (s); &__c[0];})) // Copied from pgmspace.h in avr-libc source
+#endif
+#endif
+#endif
+#endif
+
+#if !defined(DEBUG_USB_HOST) && ENABLE_UHS_DEBUGGING
+#define DEBUG_USB_HOST
+#endif
+
+#if !defined(WIICAMERA) && ENABLE_WII_IR_CAMERA
+#define WIICAMERA
+#endif
+
+#define UHS_SLEEP_MS(v) pUsb->sof_delay(v)
+
+#ifndef UHS_NI
+#define UHS_NI __attribute__((noinline))
+#endif
+
+#endif /* SETTINGS_H */

Marlin/src/sd/usb_flashdrive/lib-uhs3/UHS_host/UHS_usb_ch9.h

@@ -0,0 +1,222 @@
+/* Copyright (C) 2015-2016 Andrew J. Kroll
+   and
+Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web      :  http://www.circuitsathome.com
+e-mail   :  support@circuitsathome.com
+ */
+
+#if !defined(_UHS_host_h_) || defined(_UHS_ch9_h_)
+#error "Never include UHS_usb_ch9.h directly; include UHS_Usb.h instead"
+#else
+
+/* USB chapter 9 structures */
+#define _UHS_ch9_h_
+
+/* Misc.USB constants */
+#define                           DEV_DESCR_LEN 18      //device descriptor length
+#define                          CONF_DESCR_LEN 9       //configuration descriptor length
+#define                          INTR_DESCR_LEN 9       //interface descriptor length
+#define                            EP_DESCR_LEN 7       //endpoint descriptor length
+
+/* Standard Device Requests */
+#define                  USB_REQUEST_GET_STATUS 0       // Standard Device Request - GET STATUS
+#define               USB_REQUEST_CLEAR_FEATURE 1       // Standard Device Request - CLEAR FEATURE
+#define                 USB_REQUEST_SET_FEATURE 3       // Standard Device Request - SET FEATURE
+#define                 USB_REQUEST_SET_ADDRESS 5       // Standard Device Request - SET ADDRESS
+#define              USB_REQUEST_GET_DESCRIPTOR 6       // Standard Device Request - GET DESCRIPTOR
+#define              USB_REQUEST_SET_DESCRIPTOR 7       // Standard Device Request - SET DESCRIPTOR
+#define           USB_REQUEST_GET_CONFIGURATION 8       // Standard Device Request - GET CONFIGURATION
+#define           USB_REQUEST_SET_CONFIGURATION 9       // Standard Device Request - SET CONFIGURATION
+#define               USB_REQUEST_GET_INTERFACE 10      // Standard Device Request - GET INTERFACE
+#define               USB_REQUEST_SET_INTERFACE 11      // Standard Device Request - SET INTERFACE
+#define                 USB_REQUEST_SYNCH_FRAME 12      // Standard Device Request - SYNCH FRAME
+
+/* Wireless USB Device Requests */
+#define                  USB_REQ_SET_ENCRYPTION 0x0D
+#define                  USB_REQ_GET_ENCRYPTION 0x0E
+#define                     USB_REQ_RPIPE_ABORT 0x0E
+#define                   USB_REQ_SET_HANDSHAKE 0x0F
+#define                     USB_REQ_RPIPE_RESET 0x0F
+#define                   USB_REQ_GET_HANDSHAKE 0x10
+#define                  USB_REQ_SET_CONNECTION 0x11
+#define               USB_REQ_SET_SECURITY_DATA 0x12
+#define               USB_REQ_GET_SECURITY_DATA 0x13
+#define                   USB_REQ_SET_WUSB_DATA 0x14
+#define             USB_REQ_LOOPBACK_DATA_WRITE 0x15
+#define              USB_REQ_LOOPBACK_DATA_READ 0x16
+#define                USB_REQ_SET_INTERFACE_DS 0x17
+
+/* USB feature flags */
+#define                 USB_DEVICE_SELF_POWERED 0   /* (read only) */
+#define                USB_DEVICE_REMOTE_WAKEUP 1   /* dev may initiate wakeup */
+#define                    USB_DEVICE_TEST_MODE 2   /* (wired high speed only) */
+#define                      USB_DEVICE_BATTERY 2   /* (wireless) */
+#define                 USB_DEVICE_B_HNP_ENABLE 3   /* (otg) dev may initiate HNP */
+#define                  USB_DEVICE_WUSB_DEVICE 3   /* (wireless)*/
+#define                USB_DEVICE_A_HNP_SUPPORT 4   /* (otg) RH port supports HNP */
+#define            USB_DEVICE_A_ALT_HNP_SUPPORT 5   /* (otg) other RH port does */
+#define                   USB_DEVICE_DEBUG_MODE 6   /* (special devices only) */
+
+#define               USB_FEATURE_ENDPOINT_HALT 0       // CLEAR/SET FEATURE - Endpoint Halt
+#define        USB_FEATURE_DEVICE_REMOTE_WAKEUP 1       // CLEAR/SET FEATURE - Device remote wake-up
+#define                   USB_FEATURE_TEST_MODE 2       // CLEAR/SET FEATURE - Test mode
+/* OTG SET FEATURE Constants    */
+#define               OTG_FEATURE_B_HNP_ENABLE  3       // SET FEATURE OTG - Enable B device to perform HNP
+#define               OTG_FEATURE_A_HNP_SUPPORT 4       // SET FEATURE OTG - A device supports HNP
+#define           OTG_FEATURE_A_ALT_HNP_SUPPORT 5       // SET FEATURE OTG - Another port on the A device supports HNP
+
+/* Setup Data Constants */
+#define                USB_SETUP_HOST_TO_DEVICE 0x00    // Device Request bmRequestType transfer direction - host to device transfer
+#define                USB_SETUP_DEVICE_TO_HOST 0x80    // Device Request bmRequestType transfer direction - device to host transfer
+#define                 USB_SETUP_TYPE_STANDARD 0x00    // Device Request bmRequestType type - standard
+#define                    USB_SETUP_TYPE_CLASS 0x20    // Device Request bmRequestType type - class
+#define                   USB_SETUP_TYPE_VENDOR 0x40    // Device Request bmRequestType type - vendor
+#define              USB_SETUP_RECIPIENT_DEVICE 0x00    // Device Request bmRequestType recipient - device
+#define           USB_SETUP_RECIPIENT_INTERFACE 0x01    // Device Request bmRequestType recipient - interface
+#define            USB_SETUP_RECIPIENT_ENDPOINT 0x02    // Device Request bmRequestType recipient - endpoint
+#define               USB_SETUP_RECIPIENT_OTHER 0x03    // Device Request bmRequestType recipient - other
+#define                USB_SETUP_RECIPIENT_PORT 0x04    // Wireless USB 1.0
+#define               USB_SETUP_RECIPIENT_RPIPE 0x05    // Wireless USB 1.0
+
+
+/* USB descriptors  */
+#define                   USB_DESCRIPTOR_DEVICE 0x01    // bDescriptorType for a Device Descriptor.
+#define            USB_DESCRIPTOR_CONFIGURATION 0x02    // bDescriptorType for a Configuration Descriptor.
+#define                   USB_DESCRIPTOR_STRING 0x03    // bDescriptorType for a String Descriptor.
+#define                USB_DESCRIPTOR_INTERFACE 0x04    // bDescriptorType for an Interface Descriptor.
+#define                 USB_DESCRIPTOR_ENDPOINT 0x05    // bDescriptorType for an Endpoint Descriptor.
+#define         USB_DESCRIPTOR_DEVICE_QUALIFIER 0x06    // bDescriptorType for a Device Qualifier.
+#define              USB_DESCRIPTOR_OTHER_SPEED 0x07    // bDescriptorType for a Other Speed Configuration.
+#define          USB_DESCRIPTOR_INTERFACE_POWER 0x08    // bDescriptorType for Interface Power.
+#define                      USB_DESCRIPTOR_OTG 0x09    // bDescriptorType for an OTG Descriptor.
+#define                    USB_DESCRIPTOR_DEBUG 0x0a
+#define    USB_DESCRIPTOR_INTERFACE_ASSOCIATION 0x0b
+#define                 USB_DESCRIPTOR_SECURITY 0x0c
+#define                      USB_DESCRIPTOR_KEY 0x0d
+#define          USB_DESCRIPTOR_ENCRYPTION_TYPE 0x0e
+#define                      USB_DESCRIPTOR_BOS 0x0f
+#define        USB_DESCRIPTOR_DEVICE_CAPABILITY 0x10
+#define   USB_DESCRIPTOR_WIRELESS_ENDPOINT_COMP 0x11
+#define             USB_DESCRIPTOR_WIRE_ADAPTER 0x21
+#define                    USB_DESCRIPTOR_RPIPE 0x22
+#define         USB_DESCRIPTOR_CS_RADIO_CONTROL 0x23
+#define         USB_DESCRIPTOR_SS_ENDPOINT_COMP 0x30
+
+#define                      USB_HID_DESCRIPTOR 0x21
+
+
+// Conventional codes for class-specific descriptors. "Common Class" Spec (3.11)
+#define                USB_DESCRIPTOR_CS_DEVICE 0x21
+#define                USB_DESCRIPTOR_CS_CONFIG 0x22
+#define                USB_DESCRIPTOR_CS_STRING 0x23
+#define             USB_DESCRIPTOR_CS_INTERFACE 0x24
+#define              USB_DESCRIPTOR_CS_ENDPOINT 0x25
+
+
+
+/* USB Endpoint Transfer Types  */
+#define               USB_TRANSFER_TYPE_CONTROL 0x00    // Endpoint is a control endpoint.
+#define           USB_TRANSFER_TYPE_ISOCHRONOUS 0x01    // Endpoint is an isochronous endpoint.
+#define                  USB_TRANSFER_TYPE_BULK 0x02    // Endpoint is a bulk endpoint.
+#define             USB_TRANSFER_TYPE_INTERRUPT 0x03    // Endpoint is an interrupt endpoint.
+#define                     bmUSB_TRANSFER_TYPE 0x03    // bit mask to separate transfer type from ISO attributes
+#define               USB_TRANSFER_DIRECTION_IN 0x80    // Indicate direction is IN
+
+/* Standard Feature Selectors for CLEAR_FEATURE Requests    */
+#define              USB_FEATURE_ENDPOINT_STALL 0       // Endpoint recipient
+#define        USB_FEATURE_DEVICE_REMOTE_WAKEUP 1       // Device recipient
+#define                   USB_FEATURE_TEST_MODE 2       // Device recipient
+
+/* descriptor data structures */
+
+/* Device descriptor structure */
+typedef struct {
+        uint8_t bLength; // Length of this descriptor.
+        uint8_t bDescriptorType; // DEVICE descriptor type (USB_DESCRIPTOR_DEVICE).
+        uint16_t bcdUSB; // USB Spec Release Number (BCD).
+        uint8_t bDeviceClass; // Class code (assigned by the USB-IF). 0xFF-Vendor specific.
+        uint8_t bDeviceSubClass; // Subclass code (assigned by the USB-IF).
+        uint8_t bDeviceProtocol; // Protocol code (assigned by the USB-IF). 0xFF-Vendor specific.
+        uint8_t bMaxPacketSize0; // Maximum packet size for endpoint 0.
+        uint16_t idVendor; // Vendor ID (assigned by the USB-IF).
+        uint16_t idProduct; // Product ID (assigned by the manufacturer).
+        uint16_t bcdDevice; // Device release number (BCD).
+        uint8_t iManufacturer; // Index of String Descriptor describing the manufacturer.
+        uint8_t iProduct; // Index of String Descriptor describing the product.
+        uint8_t iSerialNumber; // Index of String Descriptor with the device's serial number.
+        uint8_t bNumConfigurations; // Number of possible configurations.
+} __attribute__((packed)) USB_DEVICE_DESCRIPTOR;
+
+/* Configuration descriptor structure */
+typedef struct {
+        uint8_t bLength; // Length of this descriptor.
+        uint8_t bDescriptorType; // CONFIGURATION descriptor type (USB_DESCRIPTOR_CONFIGURATION).
+        uint16_t wTotalLength; // Total length of all descriptors for this configuration.
+        uint8_t bNumInterfaces; // Number of interfaces in this configuration.
+        uint8_t bConfigurationValue; // Value of this configuration (1 based).
+        uint8_t iConfiguration; // Index of String Descriptor describing the configuration.
+        uint8_t bmAttributes; // Configuration characteristics.
+        uint8_t bMaxPower; // Maximum power consumed by this configuration.
+} __attribute__((packed)) USB_CONFIGURATION_DESCRIPTOR;
+
+/* Interface descriptor structure */
+typedef struct {
+        uint8_t bLength; // Length of this descriptor.
+        uint8_t bDescriptorType; // INTERFACE descriptor type (USB_DESCRIPTOR_INTERFACE).
+        uint8_t bInterfaceNumber; // Number of this interface (0 based).
+        uint8_t bAlternateSetting; // Value of this alternate interface setting.
+        uint8_t bNumEndpoints; // Number of endpoints in this interface.
+        uint8_t bInterfaceClass; // Class code (assigned by the USB-IF).  0xFF-Vendor specific.
+        uint8_t bInterfaceSubClass; // Subclass code (assigned by the USB-IF).
+        uint8_t bInterfaceProtocol; // Protocol code (assigned by the USB-IF).  0xFF-Vendor specific.
+        uint8_t iInterface; // Index of String Descriptor describing the interface.
+} __attribute__((packed)) USB_INTERFACE_DESCRIPTOR;
+
+/* Endpoint descriptor structure */
+typedef struct {
+        uint8_t bLength; // Length of this descriptor.
+        uint8_t bDescriptorType; // ENDPOINT descriptor type (USB_DESCRIPTOR_ENDPOINT).
+        uint8_t bEndpointAddress; // Endpoint address. Bit 7 indicates direction (0=OUT, 1=IN).
+        uint8_t bmAttributes; // Endpoint transfer type.
+        uint16_t wMaxPacketSize; // Maximum packet size.
+        uint8_t bInterval; // Polling interval in frames.
+} __attribute__((packed)) USB_ENDPOINT_DESCRIPTOR;
+
+/* HID descriptor */
+/*
+typedef struct {
+        uint8_t bLength;
+        uint8_t bDescriptorType;
+        uint16_t bcdHID; // HID class specification release
+        uint8_t bCountryCode;
+        uint8_t bNumDescriptors; // Number of additional class specific descriptors
+        uint8_t bDescrType; // Type of class descriptor
+        uint16_t wDescriptorLength; // Total size of the Report descriptor
+} __attribute__((packed)) USB_HID_DESCRIPTOR;
+*/
+
+typedef struct {
+        uint8_t bDescrType; // Type of class descriptor
+        uint16_t wDescriptorLength; // Total size of the Report descriptor
+} __attribute__((packed)) HID_CLASS_DESCRIPTOR_LEN_AND_TYPE;
+
+#endif // _ch9_h_

Marlin/src/sd/usb_flashdrive/lib-uhs3/UHS_host/UHS_usbhost.h

@@ -0,0 +1,452 @@
+/* Copyright (C) 2015-2016 Andrew J. Kroll
+   and
+Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web      :  http://www.circuitsathome.com
+e-mail   :  support@circuitsathome.com
+ */
+
+#if !defined(_UHS_host_h_)
+#error "Never include UHS_usbhost.h directly; include UHS_host.h instead"
+#else
+#if !defined(_USBHOST_H_)
+#define _USBHOST_H_
+
+// Very early prototypes
+#if defined(UHS_LOAD_BT)
+void UHS_BT_SetUSBInterface(UHS_USB_HOST_BASE *host, ENUMERATION_INFO *ei);
+void UHS_BT_ScanUninitialized(UHS_USB_HOST_BASE *host);
+void UHS_BT_Poll(UHS_USB_HOST_BASE *host);
+#endif
+#if defined(UHS_LOAD_HID)
+void UHS_HID_SetUSBInterface(UHS_USB_HOST_BASE *host, ENUMERATION_INFO *ei);
+void UHS_HID_ScanUninitialized(UHS_USB_HOST_BASE *host);
+void UHS_HID_Poll(UHS_USB_HOST_BASE *host);
+#endif
+
+//#if defined(LOAD_UHS_CDC_ACM) || defined(LOAD_UHS_CDC_ACM_FTDI) || defined(LOAD_UHS_CDC_ACM_PROLIFIC) || defined(LOAD_UHS_CDC_ACM_XR21B1411)
+//void UHS_CDC_ACM_SetUSBInterface(UHS_USB_HOST_BASE *host, ENUMERATION_INFO *ei);
+//void UHS_CDC_ACM_ScanUninitialized(UHS_USB_HOST_BASE *host);
+//void UHS_CDC_ACM_Poll(UHS_USB_HOST_BASE *host);
+//#endif
+
+class UHS_USBInterface; // forward class declaration
+
+// enumerator to turn the VBUS on/off
+
+typedef enum {
+        vbus_on = 0,
+        vbus_off = 1
+} VBUS_t;
+
+// All host SEI use this base class
+
+class UHS_USB_HOST_BASE {
+public:
+        AddressPool addrPool;
+        UHS_USBInterface* devConfig[UHS_HOST_MAX_INTERFACE_DRIVERS];
+        volatile uint8_t usb_error;
+        volatile uint8_t usb_task_state;
+        volatile uint8_t usb_task_polling_disabled;
+        volatile uint8_t usb_host_speed;
+        volatile uint8_t hub_present;
+
+        UHS_USB_HOST_BASE(void) {
+                for(uint16_t i = 0; i < UHS_HOST_MAX_INTERFACE_DRIVERS; i++) {
+                        devConfig[i] = NULL;
+                }
+                usb_task_polling_disabled = 0;
+                usb_task_state = UHS_USB_HOST_STATE_INITIALIZE; //set up state machine
+                usb_host_speed = 0;
+                usb_error = 0;
+        };
+
+        /////////////////////////////////////////////
+        //
+        // Virtual methods that interface to the SIE
+        // Overriding each is mandatory.
+        //
+        /////////////////////////////////////////////
+
+        /**
+         * Delay for x milliseconds
+         * Override if your controller provides an SOF IRQ, which may involve
+         * some sort of reentrant ISR or workaround with interrupts enabled.
+         *
+         * @param x how many milliseconds to delay
+         * @return true if delay completed without a state change, false if delay aborted
+         */
+        virtual bool UHS_NI sof_delay(uint16_t x) {
+                if(!(usb_task_state & UHS_USB_HOST_STATE_MASK)) return false;
+                uint8_t current_state = usb_task_state;
+                while(current_state == usb_task_state && x--) {
+                        delay(1);
+                }
+                return (current_state == usb_task_state);
+        };
+
+        virtual UHS_EpInfo * UHS_NI ctrlReqOpen(NOTUSED(uint8_t addr), NOTUSED(uint64_t Request), NOTUSED(uint8_t* dataptr)) {
+                return NULL;
+        };
+
+        virtual void UHS_NI vbusPower(NOTUSED(VBUS_t state)) {
+        };
+
+        virtual void UHS_NI Task(void) {
+        };
+
+        virtual uint8_t UHS_NI SetAddress(NOTUSED(uint8_t addr), NOTUSED(uint8_t ep), NOTUSED(UHS_EpInfo **ppep), NOTUSED(uint16_t &nak_limit)) {
+                return UHS_HOST_ERROR_NOT_IMPLEMENTED;
+        };
+
+        virtual uint8_t UHS_NI OutTransfer(NOTUSED(UHS_EpInfo *pep), NOTUSED(uint16_t nak_limit), NOTUSED(uint16_t nbytes), NOTUSED(uint8_t *data)) {
+                return UHS_HOST_ERROR_NOT_IMPLEMENTED;
+        };
+
+        virtual uint8_t UHS_NI InTransfer(NOTUSED(UHS_EpInfo *pep), NOTUSED(uint16_t nak_limit), NOTUSED(uint16_t *nbytesptr), NOTUSED(uint8_t *data)) {
+                return UHS_HOST_ERROR_NOT_IMPLEMENTED;
+        };
+
+        virtual uint8_t UHS_NI ctrlReqClose(NOTUSED(UHS_EpInfo *pep), NOTUSED(uint8_t bmReqType), NOTUSED(uint16_t left), NOTUSED(uint16_t nbytes), NOTUSED(uint8_t *dataptr)) {
+                return UHS_HOST_ERROR_NOT_IMPLEMENTED;
+        };
+
+        virtual uint8_t UHS_NI ctrlReqRead(NOTUSED(UHS_EpInfo *pep), NOTUSED(uint16_t *left), NOTUSED(uint16_t *read), NOTUSED(uint16_t nbytes), NOTUSED(uint8_t *dataptr)) {
+                return UHS_HOST_ERROR_NOT_IMPLEMENTED;
+        };
+
+        virtual uint8_t UHS_NI dispatchPkt(NOTUSED(uint8_t token), NOTUSED(uint8_t ep), NOTUSED(uint16_t nak_limit)) {
+                return UHS_HOST_ERROR_NOT_IMPLEMENTED;
+        };
+
+        virtual uint8_t UHS_NI init(void) {
+                return 0;
+        };
+
+        virtual void UHS_NI doHostReset(void) {
+        };
+
+        virtual int16_t UHS_NI Init(NOTUSED(int16_t mseconds)) {
+                return -1;
+        };
+
+        virtual int16_t UHS_NI Init(void) {
+                return Init(INT16_MIN);
+        };
+
+        virtual uint8_t hwlPowerUp(void) {
+                /* This is for machine specific support to enable/power up the USB HW to operate*/
+                return UHS_HOST_ERROR_NOT_IMPLEMENTED;
+        };
+
+        virtual uint8_t hwPowerDown(void) {
+                /* This is for machine specific support to disable/powerdown the USB Hw */
+                return UHS_HOST_ERROR_NOT_IMPLEMENTED;
+        };
+
+        virtual bool IsHub(uint8_t klass) {
+                return (klass == UHS_USB_CLASS_HUB);
+        };
+
+        virtual void UHS_NI suspend_host(void) {
+                // Used on MCU that lack control of IRQ priority (AVR).
+                // Suspends ISRs, for critical code. IRQ will be serviced after it is resumed.
+                // NOTE: you must track the state yourself!
+        };
+
+        virtual void UHS_NI resume_host(void) {
+                // Used on MCU that lack control of IRQ priority (AVR).
+                // Resumes ISRs.
+                // NOTE: you must track the state yourself!
+        };
+
+        /////////////////////////////////////////////
+        //
+        // Built-ins, No need to override
+        //
+        /////////////////////////////////////////////
+        // these two probably will go away, and won't be used, TBD
+        inline void Poll_Others(void) {
+#if defined(UHS_LOAD_BT)
+                UHS_BT_Poll(this);
+#endif
+#if defined(UHS_LOAD_HID)
+                UHS_HID_Poll(this);
+#endif
+        }
+
+        inline void DisablePoll(void) {
+                noInterrupts();
+                usb_task_polling_disabled++;
+                DDSB();
+                interrupts();
+        }
+
+        inline void EnablePoll(void) {
+                noInterrupts();
+                usb_task_polling_disabled--;
+                DDSB();
+                interrupts();
+        }
+
+        uint8_t UHS_NI seekInterface(ENUMERATION_INFO *ei, uint16_t inf, USB_CONFIGURATION_DESCRIPTOR *ucd);
+
+        uint8_t UHS_NI setEpInfoEntry(uint8_t addr, uint8_t iface, uint8_t epcount, volatile UHS_EpInfo* eprecord_ptr);
+
+        uint8_t UHS_NI EPClearHalt(uint8_t addr, uint8_t ep);
+
+        uint8_t UHS_NI ctrlReq(uint8_t addr, uint64_t Request, uint16_t nbytes, uint8_t* dataptr);
+
+        uint8_t UHS_NI getDevDescr(uint8_t addr, uint16_t nbytes, uint8_t* dataptr);
+
+        uint8_t UHS_NI getConfDescr(uint8_t addr, uint16_t nbytes, uint8_t conf, uint8_t* dataptr);
+
+        uint8_t UHS_NI setAddr(uint8_t oldaddr, uint8_t newaddr);
+
+        uint8_t UHS_NI setConf(uint8_t addr, uint8_t conf_value);
+
+        uint8_t UHS_NI getStrDescr(uint8_t addr, uint16_t nbytes, uint8_t index, uint16_t langid, uint8_t* dataptr);
+
+        void UHS_NI ReleaseDevice(uint8_t addr);
+
+        uint8_t UHS_NI Configuring(uint8_t parent, uint8_t port, uint8_t speed);
+
+        void UHS_NI DeviceDefaults(uint8_t maxep, UHS_USBInterface *device);
+
+        UHS_EpInfo* UHS_NI getEpInfoEntry(uint8_t addr, uint8_t ep);
+
+        inline uint8_t getUsbTaskState(void) {
+                return ( usb_task_state);
+        };
+
+        inline AddressPool* GetAddressPool(void) {
+                return &addrPool;
+        };
+
+        int UHS_NI RegisterDeviceClass(UHS_USBInterface *pdev) {
+                for(uint8_t i = 0; i < UHS_HOST_MAX_INTERFACE_DRIVERS; i++) {
+                        if(!devConfig[i]) {
+                                devConfig[i] = pdev;
+                                return i;
+                        }
+                }
+                //return UHS_HOST_ERROR_CANT_REGISTER_DEVICE_CLASS;
+                return -1;
+        };
+#if 0
+
+        inline void ForEachUsbDevice(UsbDeviceHandleFunc pfunc) {
+                addrPool.ForEachUsbDevice(pfunc);
+        };
+#endif
+
+        uint8_t TestInterface(ENUMERATION_INFO *ei);
+        uint8_t enumerateInterface(ENUMERATION_INFO *ei);
+        uint8_t getNextInterface(ENUMERATION_INFO *ei, UHS_EpInfo *pep, uint8_t data[], uint16_t *left, uint16_t *read, uint8_t *offset);
+        uint8_t initDescrStream(ENUMERATION_INFO *ei, USB_CONFIGURATION_DESCRIPTOR *ucd, UHS_EpInfo *pep, uint8_t *data, uint16_t *left, uint16_t *read, uint8_t *offset);
+        uint8_t outTransfer(uint8_t addr, uint8_t ep, uint16_t nbytes, uint8_t* data);
+        uint8_t inTransfer(uint8_t addr, uint8_t ep, uint16_t *nbytesptr, uint8_t* data);
+        uint8_t doSoftReset(uint8_t parent, uint8_t port, uint8_t address);
+        uint8_t getone(UHS_EpInfo *pep, uint16_t *left, uint16_t *read, uint8_t *dataptr, uint8_t *offset);
+        uint8_t eat(UHS_EpInfo *pep, uint16_t *left, uint16_t *read, uint8_t *dataptr, uint8_t *offset, uint16_t *yum);
+
+};
+
+// All device interface drivers use this subclass
+
+class UHS_USBInterface {
+public:
+
+        UHS_USB_HOST_BASE *pUsb; // Parent USB host
+        volatile uint8_t bNumEP; // total number of EP in this interface
+        volatile UHS_EpInfo epInfo[16]; // This is a stub, override in the driver.
+
+        volatile uint8_t bAddress; // address of the device
+        volatile uint8_t bConfNum; // configuration number
+        volatile uint8_t bIface; // interface value
+        volatile bool bPollEnable; // poll enable flag, operating status
+        volatile uint32_t qNextPollTime; // next poll time
+
+        /**
+         * Resets interface driver to unused state. You should override this in
+         * your driver if it requires extra class variable cleanup.
+         */
+        virtual void DriverDefaults(void) {
+                printf("Default driver defaults.\r\n");
+                pUsb->DeviceDefaults(bNumEP, this);
+        };
+
+        /**
+         * Checks if this interface is supported.
+         * Executed called when new devices are connected.
+         *
+         * @param ei
+         * @return true if the interface is supported
+         */
+        virtual bool OKtoEnumerate(NOTUSED(ENUMERATION_INFO *ei)) {
+                return false;
+        };
+
+        /**
+         * Configures any needed endpoint information for an interface.
+         * You must provide this in your driver.
+         * Executed when new devices are connected and OKtoEnumerate()
+         * returned true.
+         *
+         * @param ei
+         * @return zero on success
+         */
+        virtual uint8_t SetInterface(NOTUSED(ENUMERATION_INFO *ei)) {
+                return UHS_HOST_ERROR_NOT_IMPLEMENTED;
+        };
+
+        /**
+         * Interface specific additional setup and enumeration that
+         * can't occur when the descriptor stream is open.
+         * Also used for collection of unclaimed interfaces, to link to the master.
+         *
+         * @return zero on success
+         */
+        virtual uint8_t Finalize(void) {
+                return 0;
+        };
+
+        /**
+         *  Executed after interface is finalized but, before polling has started.
+         *
+         * @return 0 on success
+         */
+        virtual uint8_t OnStart(void) {
+                return 0;
+        };
+
+        /**
+         * Start interface polling
+         * @return
+         */
+        virtual uint8_t Start(void) {
+                uint8_t rcode = OnStart();
+                if(!rcode) bPollEnable = true;
+                return rcode;
+        };
+
+        /**
+         * Executed before anything else in Release().
+         *
+         */
+        virtual void OnRelease(void) {
+                return;
+        };
+
+        /**
+         * Release resources when device is disconnected.
+         * Normally this does not need to be overridden.
+         */
+        virtual void Release(void) {
+                OnRelease();
+                DriverDefaults();
+                return;
+        };
+
+        /**
+         * Executed After driver polls.
+         * Can be used when there is an important change detected during polling
+         * and you want to handle it elsewhere.
+         * Examples:
+         * Media status change for bulk, e.g. ready, not-ready, media changed, door opened.
+         * Button state/joystick position/etc changes on a HID device.
+         * Flow control status change on a communication device, e.g. CTS on serial
+         */
+        virtual void OnPoll(void) {
+                return;
+        };
+
+        /**
+         * Poll interface driver. You should override this in your driver if you
+         * require polling faster or slower than every 100 milliseconds, or your
+         * driver requires special housekeeping.
+         */
+        virtual void Poll() {
+                OnPoll();
+                qNextPollTime = millis() + 100;
+        };
+
+        virtual bool UHS_NI Polling(void) {
+                return bPollEnable;
+        }
+
+        /**
+         * This is only for a hub.
+         * @param port
+         */
+        virtual void ResetHubPort(NOTUSED(uint8_t port)) {
+                return;
+        };
+
+#if 0
+        /**
+         *
+         * @return true if this interface is Vendor Specific.
+         */
+        virtual bool IsVSI() {
+                return false;
+        }
+#endif
+};
+
+#if 0
+/**
+ *
+ * Vendor Specific interface class.
+ * This is used by a partner interface.
+ * It can also be used to force-enumerate an interface that
+ * can use this interface directly.
+ * You can also add an instance of this class within the interface constructor
+ * if you expect the interface.
+ *
+ * If this is not needed, it may be removed. Nothing I have written needs this.
+ * Let me know if it is not required, then IsVSI method can also be shit-canned.
+ * -- AJK
+ */
+
+class UHS_VSI : public UHS_USBInterface {
+public:
+        volatile UHS_EpInfo epInfo[1];
+        volatile ENUMERATION_INFO eInfo;
+        UHS_VSI(UHS_USB_HOST_BASE *p);
+        bool OKtoEnumerate(ENUMERATION_INFO *ei);
+        uint8_t SetInterface(ENUMERATION_INFO *ei);
+        virtual void DriverDefaults(void);
+        virtual void Release(void);
+
+        uint8_t GetAddress(void) {
+                return bAddress;
+        };
+
+        virtual bool IsVSI() {
+                return true;
+        }
+
+};
+#endif
+
+#endif //_USBHOST_H_
+#endif

Marlin/src/sd/usb_flashdrive/lib-uhs3/UHS_host/UHS_util_INLINE.h

@@ -0,0 +1,129 @@
+/* Copyright (C) 2015-2016 Andrew J. Kroll
+   and
+Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web      :  http://www.circuitsathome.com
+e-mail   :  support@circuitsathome.com
+ */
+
+#if defined(LOAD_USB_HOST_SYSTEM) && !defined(USB_HOST_SYSTEM_UTIL_LOADED)
+#define USB_HOST_SYSTEM_UTIL_LOADED
+
+// 0x80 is the default (i.e. trace) to turn off set this global to something lower.
+// this allows for 126 other debugging levels.
+// TO-DO: Allow assignment to a different serial port by software
+int UsbDEBUGlvl = 0x80;
+
+void E_Notifyc(char c, int lvl) {
+        if(UsbDEBUGlvl < lvl) return;
+#if defined(ARDUINO) && ARDUINO >=100
+        USB_HOST_SERIAL.print(c);
+#else
+        USB_HOST_SERIAL.print(c, BYTE);
+#endif
+        //USB_HOST_SERIAL.flush();
+}
+
+void E_Notify(char const * msg, int lvl) {
+        if(UsbDEBUGlvl < lvl) return;
+        if(!msg) return;
+        char c;
+
+        while((c = pgm_read_byte(msg++))) E_Notifyc(c, lvl);
+}
+
+void E_NotifyStr(char const * msg, int lvl) {
+        if(UsbDEBUGlvl < lvl) return;
+        if(!msg) return;
+        char c;
+
+        while((c = *msg++)) E_Notifyc(c, lvl);
+}
+
+void E_Notify(uint8_t b, int lvl) {
+        if(UsbDEBUGlvl < lvl) return;
+#if defined(ARDUINO) && ARDUINO >=100
+        USB_HOST_SERIAL.print(b);
+#else
+        USB_HOST_SERIAL.print(b, DEC);
+#endif
+}
+
+void E_Notify(double d, int lvl) {
+        if(UsbDEBUGlvl < lvl) return;
+        USB_HOST_SERIAL.print(d);
+}
+
+#ifdef DEBUG_USB_HOST
+
+void NotifyFailGetDevDescr(void) {
+        Notify(PSTR("\r\ngetDevDescr "), 0x80);
+}
+
+void NotifyFailSetDevTblEntry(void) {
+        Notify(PSTR("\r\nsetDevTblEn "), 0x80);
+}
+
+void NotifyFailGetConfDescr(void) {
+        Notify(PSTR("\r\ngetConf "), 0x80);
+}
+
+void NotifyFailSetConfDescr(void) {
+        Notify(PSTR("\r\nsetConf "), 0x80);
+}
+
+void NotifyFailGetDevDescr(uint8_t reason) {
+        NotifyFailGetDevDescr();
+        NotifyFail(reason);
+}
+
+void NotifyFailSetDevTblEntry(uint8_t reason) {
+        NotifyFailSetDevTblEntry();
+        NotifyFail(reason);
+
+}
+
+void NotifyFailGetConfDescr(uint8_t reason) {
+        NotifyFailGetConfDescr();
+        NotifyFail(reason);
+}
+
+void NotifyFailSetConfDescr(uint8_t reason) {
+        NotifyFailSetConfDescr();
+        NotifyFail(reason);
+}
+
+void NotifyFailUnknownDevice(uint16_t VID, uint16_t PID) {
+        Notify(PSTR("\r\nUnknown Device Connected - VID: "), 0x80);
+        D_PrintHex<uint16_t > (VID, 0x80);
+        Notify(PSTR(" PID: "), 0x80);
+        D_PrintHex<uint16_t > (PID, 0x80);
+}
+
+void NotifyFail(uint8_t rcode) {
+        D_PrintHex<uint8_t > (rcode, 0x80);
+        Notify(PSTR("\r\n"), 0x80);
+}
+#endif
+
+#else
+#error "Never include UHS_util_INLINE.h, include UHS_host.h instead"
+#endif

Marlin/src/sd/usb_flashdrive/lib-uhs3/UHS_host/USB_HOST_SHIELD/UHS_max3421e.h

@@ -0,0 +1,226 @@
+/* Copyright (C) 2015-2016 Andrew J. Kroll
+   and
+Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This software may be distributed and modified under the terms of the GNU
+General Public License version 2 (GPL2) as published by the Free Software
+Foundation and appearing in the file GPL2.TXT included in the packaging of
+this file. Please note that GPL2 Section 2[b] requires that all works based
+on this software must also be made publicly available under the terms of
+the GPL2 ("Copyleft").
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web      :  http://www.circuitsathome.com
+e-mail   :  support@circuitsathome.com
+ */
+#if !defined(USB_HOST_SHIELD_H) || defined(_max3421e_h_)
+#error "Never include UHS_max3421e.h directly; include USB_HOST_SHIELD.h instead"
+#else
+
+#define _max3421e_h_
+
+/* MAX3421E register/bit names and bitmasks */
+
+#define SE0     0
+#define SE1     1
+#define FSHOST  2
+#define LSHOST  3
+
+/* MAX3421E command byte format: rrrrr0wa where 'r' is register number  */
+
+//
+// MAX3421E Registers in HOST mode.
+//
+#define        rRCVFIFO 0x08            // Receive FIFO Register
+#define        rSNDFIFO 0x10            // Send FIFO Register
+#define        rSUDFIFO 0x20            // Set Up Data FIFO Register
+#define          rRCVBC 0x30            // Receive FIFO Byte Count Register
+#define          rSNDBC 0x38            // Send FIFO Byte Count Register
+
+// USB Interrupt Request Status (USBIRQ)
+#define         rUSBIRQ 0x68            // USB Interrupt Request Register
+#define       bmVBUSIRQ 0x40            // Vbus Present Interrupt Request
+#define     bmNOVBUSIRQ 0x20            // Vbus Absent Interrupt Request
+#define      bmOSCOKIRQ 0x01            // Oscillator OK Interrupt Request
+
+// USB Interrupt Request Control (USBIEN)
+#define         rUSBIEN 0x70            // USB Interrupt Request Enable Register
+#define        bmVBUSIE bmVBUSIRQ       // Vbus Present Interrupt Request Enable
+#define      bmNOVBUSIE bmNOVBUSIRQ     // Vbus Absent Interrupt Request Enable
+#define       bmOSCOKIE bmOSCOKIRQ      // Oscillator OK Interrupt Request Enable
+
+// (USBCTL)
+#define         rUSBCTL 0x78            //15<<3
+#define       bmCHIPRES 0x20            //b5
+#define       bmPWRDOWN 0x10            //b4
+
+// (CPUCTL)
+#define         rCPUCTL 0x80            //16<<3
+#define     bmPUSLEWID1 0x80            //b7
+#define     bmPULSEWID0 0x40            //b6
+#define            bmIE 0x01            //b0
+
+// bmPUSLEWID1 bmPULSEWID0 Pulse width
+// 0           0           10.6uS
+// 0           1            5.3uS
+// 1           0            2.6uS
+// 1           1            1.3uS
+#define  PUSLEWIDTH10_6 (0)
+#define   PUSLEWIDTH5_3 (bmPULSEWID0)
+#define   PUSLEWIDTH2_6 (bmPUSLEWID1)
+#define   PUSLEWIDTH1_3 (bmPULSEWID0 | bmPUSLEWID1)
+
+// (PINCTL)
+#define         rPINCTL 0x88            //17<<3
+#define       bmFDUPSPI 0x10            //b4
+#define      bmINTLEVEL 0x08            //b3
+#define        bmPOSINT 0x04            //b2
+#define          bmGPXB 0x02            //b1
+#define          bmGPXA 0x01            //b0
+
+// GPX pin selections
+#define     GPX_OPERATE 0x00            //
+#define       GPX_VBDET 0x01            //
+#define      GPX_BUSACT 0x02            //
+#define         GPX_SOF 0x03            //
+
+#define       rREVISION 0x90            //18<<3
+
+// (IOPINS1)
+#define        rIOPINS1 0xa0            //20<<3
+#define        bmGPOUT0 0x01            //
+#define        bmGPOUT1 0x02            //
+#define        bmGPOUT2 0x04            //
+#define        bmGPOUT3 0x08            //
+#define         bmGPIN0 0x10            //
+#define         bmGPIN1 0x20            //
+#define         bmGPIN2 0x40            //
+#define         bmGPIN3 0x80            //
+
+// (IOPINS2)
+#define        rIOPINS2 0xa8            //21<<3
+#define        bmGPOUT4 0x01            //
+#define        bmGPOUT5 0x02            //
+#define        bmGPOUT6 0x04            //
+#define        bmGPOUT7 0x08            //
+#define         bmGPIN4 0x10            //
+#define         bmGPIN5 0x20            //
+#define         bmGPIN6 0x40            //
+#define         bmGPIN7 0x80            //
+
+// (GPINIRQ)
+#define        rGPINIRQ 0xb0            //22<<3
+#define      bmGPINIRQ0 0x01            //
+#define      bmGPINIRQ1 0x02            //
+#define      bmGPINIRQ2 0x04            //
+#define      bmGPINIRQ3 0x08            //
+#define      bmGPINIRQ4 0x10            //
+#define      bmGPINIRQ5 0x20            //
+#define      bmGPINIRQ6 0x40            //
+#define      bmGPINIRQ7 0x80            //
+
+// (GPINIEN)
+#define        rGPINIEN 0xb8            //23<<3
+#define      bmGPINIEN0 0x01            //
+#define      bmGPINIEN1 0x02            //
+#define      bmGPINIEN2 0x04            //
+#define      bmGPINIEN3 0x08            //
+#define      bmGPINIEN4 0x10            //
+#define      bmGPINIEN5 0x20            //
+#define      bmGPINIEN6 0x40            //
+#define      bmGPINIEN7 0x80            //
+
+// (GPINPOL)
+#define        rGPINPOL 0xc0            //24<<3
+#define      bmGPINPOL0 0x01            //
+#define      bmGPINPOL1 0x02            //
+#define      bmGPINPOL2 0x04            //
+#define      bmGPINPOL3 0x08            //
+#define      bmGPINPOL4 0x10            //
+#define      bmGPINPOL5 0x20            //
+#define      bmGPINPOL6 0x40            //
+#define      bmGPINPOL7 0x80            //
+
+//
+// If any data transfer errors occur, the HXFRDNIRQ asserts, while the RCVDAVIRQ does not.
+//
+// The CPU clears the SNDBAVIRQ by writing the SNDBC register.
+// The CPU should never directly clear the SNDBAVIRQ bit.
+
+// Host Interrupt Request Status (HIRQ)
+#define           rHIRQ 0xc8            // Host Interrupt Request Register
+#define   bmBUSEVENTIRQ 0x01            // BUS Reset Done or BUS Resume Interrupt Request
+#define        bmRWUIRQ 0x02            // Remote Wakeup Interrupt Request
+#define     bmRCVDAVIRQ 0x04            // Receive FIFO Data Available Interrupt Request
+#define     bmSNDBAVIRQ 0x08            // Send Buffer Available Interrupt Request
+#define      bmSUSDNIRQ 0x10            // Suspend operation Done Interrupt Request
+#define     bmCONDETIRQ 0x20            // Peripheral Connect/Disconnect Interrupt Request
+#define      bmFRAMEIRQ 0x40            // Frame Generator Interrupt Request
+#define     bmHXFRDNIRQ 0x80            // Host Transfer Done Interrupt Request
+
+// IRQs that are OK for the CPU to clear
+#define     ICLRALLBITS (bmBUSEVENTIRQ | bmRWUIRQ | bmRCVDAVIRQ | bmSUSDNIRQ | bmCONDETIRQ | bmFRAMEIRQ | bmHXFRDNIRQ)
+
+// Host Interrupt Request Control (HIEN)
+#define           rHIEN 0xd0            //
+#define    bmBUSEVENTIE bmBUSEVENTIRQ   // BUS Reset Done or BUS Resume Interrupt Request Enable
+#define         bmRWUIE bmRWUIRQ        // Remote Wakeup Interrupt Request Enable
+#define      bmRCVDAVIE bmRCVDAVIRQ     // Receive FIFO Data Available Interrupt Request Enable
+#define      bmSNDBAVIE bmSNDBAVIRQ     // Send Buffer Available Interrupt Request Enable
+#define       bmSUSDNIE bmSUSDNIRQ      // Suspend operation Done Interrupt Request Enable
+#define      bmCONDETIE bmCONDETIRQ     // Peripheral Connect/Disconnect Interrupt Request Enable
+#define       bmFRAMEIE bmFRAMEIRQ      // Frame Generator Interrupt Request Enable
+#define      bmHXFRDNIE bmHXFRDNIRQ     // Host Transfer Done Interrupt Request Enable
+
+// (MODE))
+#define           rMODE 0xd8            //27<<3
+#define          bmHOST 0x01            //
+#define      bmLOWSPEED 0x02            //
+#define        bmHUBPRE 0x04            //
+#define     bmSOFKAENAB 0x08            //
+#define        bmSEPIRQ 0x10            //
+#define      bmDELAYISO 0x20            //
+#define      bmDMPULLDN 0x40            //
+#define      bmDPPULLDN 0x80            //
+
+#define        rPERADDR 0xe0            //28<<3
+
+// (HCTL)
+#define           rHCTL 0xe8            //29<<3
+#define        bmBUSRST 0x01            //
+#define        bmFRMRST 0x02            //
+#define     bmSAMPLEBUS 0x04            //
+#define        bmSIGRSM 0x08            //
+#define       bmRCVTOG0 0x10            //
+#define       bmRCVTOG1 0x20            //
+#define       bmSNDTOG0 0x40            //
+#define       bmSNDTOG1 0x80            //
+
+// Host transfer (HXFR)
+#define           rHXFR 0xf0            //30<<3
+/* Host transfer token values for writing the HXFR register (R30)   */
+/* OR this bit field with the endpoint number in bits 3:0               */
+#define       MAX3421E_tokSETUP 0x10    // HS=0, ISO=0, OUTNIN=0, SETUP=1
+#define          MAX3421E_tokIN 0x00    // HS=0, ISO=0, OUTNIN=0, SETUP=0
+#define         MAX3421E_tokOUT 0x20    // HS=0, ISO=0, OUTNIN=1, SETUP=0
+#define        MAX3421E_tokINHS 0x80    // HS=1, ISO=0, OUTNIN=0, SETUP=0
+#define       MAX3421E_tokOUTHS 0xA0    // HS=1, ISO=0, OUTNIN=1, SETUP=0
+#define       MAX3421E_tokISOIN 0x40    // HS=0, ISO=1, OUTNIN=0, SETUP=0
+#define      MAX3421E_tokISOOUT 0x60    // HS=0, ISO=1, OUTNIN=1, SETUP=0
+
+// (HRSL)
+#define           rHRSL 0xf8            //31<<3
+#define      bmRCVTOGRD 0x10            //
+#define      bmSNDTOGRD 0x20            //
+#define       bmKSTATUS 0x40            //
+#define       bmJSTATUS 0x80            //
+#define           bmSE0 0x00            //SE0 - disconnect state
+#define           bmSE1 0xc0            //SE1 - illegal state
+
+#define    MODE_FS_HOST (bmDPPULLDN|bmDMPULLDN|bmHOST|bmSOFKAENAB)
+#define    MODE_LS_HOST (bmDPPULLDN|bmDMPULLDN|bmHOST|bmLOWSPEED|bmSOFKAENAB)
+
+#endif //_max3421e_h_

Marlin/src/sd/usb_flashdrive/lib-uhs3/UHS_host/USB_HOST_SHIELD/USB_HOST_SHIELD.h

@@ -0,0 +1,519 @@
+/* Copyright (C) 2015-2016 Andrew J. Kroll
+   and
+Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This software may be distributed and modified under the terms of the GNU
+General Public License version 2 (GPL2) as published by the Free Software
+Foundation and appearing in the file GPL2.TXT included in the packaging of
+this file. Please note that GPL2 Section 2[b] requires that all works based
+on this software must also be made publicly available under the terms of
+the GPL2 ("Copyleft").
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web      :  http://www.circuitsathome.com
+e-mail   :  support@circuitsathome.com
+ */
+
+#ifndef USB_HOST_SHIELD_H
+#define USB_HOST_SHIELD_H
+
+// uncomment to get 'printf' console debugging. NOT FOR UNO!
+//#define DEBUG_PRINTF_EXTRA_HUGE_USB_HOST_SHIELD
+
+#ifdef LOAD_USB_HOST_SHIELD
+#include "UHS_max3421e.h"
+#include <SPI.h>
+
+
+#if !defined(SPI_HAS_TRANSACTION)
+#error "Your SPI library installation is too old."
+#else
+#if !defined(SPI_ATOMIC_VERSION)
+#warning "Your SPI library installation lacks 'SPI_ATOMIC_VERSION'. Please complain to the maintainer."
+#elif SPI_ATOMIC_VERSION < 1
+#error "Your SPI library installation is too old."
+#endif
+
+#endif
+#if DEBUG_PRINTF_EXTRA_HUGE
+#ifdef DEBUG_PRINTF_EXTRA_HUGE_USB_HOST_SHIELD
+#define MAX_HOST_DEBUG(...) printf_P(__VA_ARGS__)
+#else
+#define MAX_HOST_DEBUG(...) VOID0
+#endif
+#else
+#define MAX_HOST_DEBUG(...) VOID0
+#endif
+
+#if !defined(USB_HOST_SHIELD_USE_ISR)
+#if defined(USE_MULTIPLE_APP_API)
+#define USB_HOST_SHIELD_USE_ISR 0
+#else
+#define USB_HOST_SHIELD_USE_ISR 1
+#endif
+#else
+#define USB_HOST_SHIELD_USE_ISR 1
+#endif
+
+
+
+#if !USB_HOST_SHIELD_USE_ISR
+#error NOISR Polled mode _NOT SUPPORTED YET_
+
+//
+// Polled defaults
+//
+#if defined(BOARD_BLACK_WIDDOW)
+#define UHS_MAX3421E_SS_ 6
+#define UHS_MAX3421E_INT_ 3
+#elif defined(CORE_TEENSY) && (defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB1286__))
+#if EXT_RAM
+// Teensy++ 2.0 with XMEM2
+#define UHS_MAX3421E_SS_ 20
+#define UHS_MAX3421E_INT_ 7
+#else
+#define UHS_MAX3421E_SS_ 9
+#define UHS_MAX3421E_INT_ 8
+#endif
+#define UHS_MAX3421E_SPD
+#elif defined(ARDUINO_AVR_ADK)
+#define UHS_MAX3421E_SS_ 53
+#define UHS_MAX3421E_INT_ 54
+#elif defined(ARDUINO_AVR_BALANDUINO)
+#define UHS_MAX3421E_SS_ 20
+#define UHS_MAX3421E_INT_ 19
+#else
+#define UHS_MAX3421E_SS_ 10
+#define UHS_MAX3421E_INT_ 9
+#endif
+
+#else
+#if defined(ARDUINO_ARCH_PIC32)
+// PIC32 only allows edge interrupts, isn't that lovely? We'll emulate it...
+#if CHANGE < 2
+#error core too old.
+#endif
+
+#define IRQ_IS_EDGE 0
+#ifndef digitalPinToInterrupt
+// great, this isn't implemented.
+#warning digitalPinToInterrupt is not defined, complain here https://github.com/chipKIT32/chipKIT-core/issues/114
+#if defined(_BOARD_UNO_) || defined(_BOARD_UC32_)
+#define digitalPinToInterrupt(p) ((p) == 2 ? 1 : ((p) == 7 ? 2 : ((p) == 8 ? 3 : ((p) == 35 ? 4 : ((p) == 38 ? 0 : NOT_AN_INTERRUPT)))))
+#warning digitalPinToInterrupt is now defined until this is taken care of.
+#else
+#error digitalPinToInterrupt not defined for your board, complain here https://github.com/chipKIT32/chipKIT-core/issues/114
+#endif
+#endif
+#else
+#define IRQ_IS_EDGE 0
+#endif
+
+// More stupidity from our friends @ Sony...
+#if defined(ARDUINO_spresense_ast)
+#if !defined(NOT_AN_INTERRUPT)
+#define NOT_AN_INTERRUPT -1
+#endif
+#endif
+
+// SAMD uses an enum for this instead of a define. Isn't that just dandy?
+#if !defined(NOT_AN_INTERRUPT) && !defined(ARDUINO_ARCH_SAMD)
+#warning NOT_AN_INTERRUPT not defined, possible problems ahead.
+#warning If NOT_AN_INTERRUPT is an enum or something else, complain to UHS30 developers on github.
+#warning Otherwise complain to your board core developer/maintainer.
+#define NOT_AN_INTERRUPT -1
+#endif
+
+//
+// Interrupt defaults. Int0 or Int1
+//
+#ifdef BOARD_BLACK_WIDDOW
+#error "HELP! Please send us an email, I don't know the values for Int0 and Int1 on the Black Widow board!"
+#elif defined(ARDUINO_AVR_ADK)
+#define UHS_MAX3421E_SS_ 53
+#define UHS_MAX3421E_INT_ 54
+#elif defined(ARDUINO_spresense_ast)
+#define UHS_MAX3421E_SS_ 21
+#define UHS_MAX3421E_INT_ 20
+#define SPIclass SPI5
+//#define UHS_MAX3421E_SPD 100000
+#elif defined(CORE_TEENSY) && (defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB1286__))
+
+// TO-DO!
+
+#if EXT_RAM
+// Teensy++ 2.0 with XMEM2
+#define UHS_MAX3421E_SS_ 20
+#define UHS_MAX3421E_INT_ 7
+#else
+#define UHS_MAX3421E_SS_ 9
+#define UHS_MAX3421E_INT_ 8
+#endif
+
+#elif defined(ARDUINO_AVR_BALANDUINO)
+#error "ISR mode is currently not supported on the Balanduino. Please set USB_HOST_SHIELD_USE_ISR to 0."
+#else
+#define UHS_MAX3421E_SS_ 10
+#ifdef __AVR__
+#if defined(__AVR_ATmega32U4__)
+#define INT_FOR_PIN2 1
+#define INT_FOR_PIN3 0
+#else
+// Everybody else???
+#define INT_FOR_PIN2 0
+#define INT_FOR_PIN3 1
+#endif
+#define UHS_MAX3421E_INT_ 3
+#else
+// Non-avr
+#if defined(ARDUINO_ARCH_PIC32)
+// UNO32 External Interrupts:
+// Pin 38 (INT0), Pin 2 (INT1), Pin 7 (INT2), Pin 8 (INT3), Pin 35 (INT4)
+#define UHS_MAX3421E_INT_ 7
+#else
+#define UHS_MAX3421E_INT_ 9
+#endif
+#endif
+#endif
+#endif
+
+
+
+#if defined(NO_AUTO_SPEED)
+// Ugly details section...
+// MAX3421E characteristics
+// SPI Serial - Clock Input. An external SPI master supplies SCLK with frequencies up to 26MHz. The
+// logic level is referenced to the voltage on VL. Data is clocked into the SPI slave inter face on the
+// rising edge of SCLK. Data is clocked out of the SPI slave interface on the falling edge of SCLK.
+// Serial Clock (SCLK) Period 38.4ns minimum. 17ns minimum pulse width. VL >2.5V
+// SCLK Fall to MISO Propagation Delay 14.2ns
+// SCLK Fall to MOSI Propagation Delay 14.2ns
+// SCLK Fall to MOSI Drive 3.5ns
+// Theoretical deadline for reply 17.7ns
+// 26MHz 38.4615ns period <-- MAX3421E theoretical maximum
+
+#if !defined(UHS_MAX3421E_SPD)
+#if defined(ARDUINO_SAMD_ZERO)
+// Zero violates spec early, needs a long setup time, or doesn't like high latency.
+#define UHS_MAX3421E_SPD 10000000
+#elif defined(ARDUINO_ARCH_PIC32)
+// PIC MX 5/6/7 characteristics
+// 25MHZ 40ns period <-- PIC MX  5/6/7 theoretical maximum
+// pulse width minimum Tsclk/2ns
+// Trise/fall 10ns maximum. 5ns is typical but not guaranteed.
+// Tsetup minimum for MISO 10ns.
+// We are in violation by 7.7ns @ 25MHz due to latency alone.
+// Even reading at end of data cycle, we only have a 2.3ns window.
+// This is too narrow to to compensate for capacitance, trace lengths, and noise.
+
+// 17.7ns + 10ns = 27.7ns
+// 18MHz fits and has enough slack time to compensate for capacitance, trace lengths, and noise.
+// For high speeds the SMP bit is recommended too, which samples at the end instead of the middle.
+// 20Mhz seems to work.
+
+#define UHS_MAX3421E_SPD 20000000
+#else
+#define UHS_MAX3421E_SPD 25000000
+#endif
+#endif
+#else
+// We start at 25MHz, and back down until hardware can take it.
+// Of course, SPI library can adjust this for us too.
+// Why not 26MHz? Because I have not found any MCU board that
+// can actually go that fast without problems.
+// Could be a shield limitation too.
+#if !defined(UHS_MAX3421E_SPD)
+#define UHS_MAX3421E_SPD 25000000
+#endif
+#endif
+
+#ifndef UHS_MAX3421E_INT
+#define UHS_MAX3421E_INT UHS_MAX3421E_INT_
+#endif
+
+#ifndef UHS_MAX3421E_SS
+#define UHS_MAX3421E_SS UHS_MAX3421E_SS_
+#endif
+
+// NOTE: On the max3421e the irq enable and irq bits are in the same position.
+
+// IRQs used if CPU polls
+#define   ENIBITSPOLLED (bmCONDETIE | bmBUSEVENTIE  | bmFRAMEIE)
+// IRQs used if CPU is interrupted
+#define      ENIBITSISR (bmCONDETIE | bmBUSEVENTIE | bmFRAMEIE /* | bmRCVDAVIRQ | bmSNDBAVIRQ | bmHXFRDNIRQ */ )
+
+#if !USB_HOST_SHIELD_USE_ISR
+#define IRQ_CHECK_MASK (ENIBITSPOLLED & ICLRALLBITS)
+#define IRQ_IS_EDGE 0
+#else
+#define IRQ_CHECK_MASK (ENIBITSISR & ICLRALLBITS)
+#endif
+
+#if IRQ_IS_EDGE
+// Note: UNO32 Interrupts can only be RISING, or FALLING.
+// This poses an interesting problem, since we want to use a LOW level.
+// The MAX3421E provides for pulse width control for an IRQ.
+// We do need to watch the timing on this, as a second IRQ could cause
+// a missed IRQ, since we read the level of the line to check if the IRQ
+// is actually for this chip. The only other alternative is to add a capacitor
+// and an NPN transistor, and use two lines. We can try this first, though.
+// Worse case, we can ignore reading the pin for verification on UNO32.
+// Too bad there is no minimum low width setting.
+//
+//   Single    Clear     First  Second   Clear first      Clear last
+//   IRQ       Single    IRQ    IRQ      Second active    pending IRQ
+//      |      |         |      |        |                |
+//      V      V         V      V        V                V
+// _____        _________        _        _                _______
+//      |______|         |______| |______| |______________|
+//
+#define IRQ_SENSE FALLING
+#if defined(ARDUINO_ARCH_PIC32)
+//#define bmPULSEWIDTH PUSLEWIDTH10_6
+#define bmPULSEWIDTH 0
+#define bmIRQ_SENSE 0
+#else
+#define bmPULSEWIDTH PUSLEWIDTH1_3
+#define bmIRQ_SENSE 0
+#endif
+#else
+#if !defined(IRQ_SENSE)
+#define IRQ_SENSE LOW
+#endif
+#if !defined(bmPULSEWIDTH)
+#define bmPULSEWIDTH 0
+#endif
+#if !defined(bmIRQ_SENSE)
+#define bmIRQ_SENSE bmINTLEVEL
+#endif
+#endif
+
+class MAX3421E_HOST :
+public UHS_USB_HOST_BASE
+#if defined(SWI_IRQ_NUM)
+, public dyn_SWI
+#endif
+{
+        // TO-DO: move these into the parent class.
+        volatile uint8_t vbusState;
+        volatile uint16_t sof_countdown;
+
+        // TO-DO: pack into a struct/union and use one byte
+        volatile bool busevent;
+        volatile bool sofevent;
+        volatile bool counted;
+        volatile bool condet;
+        volatile bool doingreset;
+
+        #ifdef USB_HOST_MANUAL_POLL
+                volatile bool frame_irq_enabled = false;
+
+                bool enable_frame_irq(bool enable) {
+                        const bool prev_state = frame_irq_enabled;
+                        if(prev_state != enable) {
+                                if(enable)
+                                        regWr(rHIEN, regRd(rHIEN) |  bmFRAMEIE);
+                                else
+                                        regWr(rHIEN, regRd(rHIEN) & ~bmFRAMEIE);
+                                frame_irq_enabled = enable;
+                        }
+                        return prev_state;
+                }
+        #endif
+
+public:
+        SPISettings MAX3421E_SPI_Settings;
+        uint8_t ss_pin;
+        uint8_t irq_pin;
+        // Will use the defaults UHS_MAX3421E_SS, UHS_MAX3421E_INT and speed
+
+        UHS_NI MAX3421E_HOST(void) {
+                sof_countdown = 0;
+                busevent = false;
+                doingreset = false;
+                sofevent = false;
+                condet = false;
+                ss_pin = UHS_MAX3421E_SS;
+                irq_pin = UHS_MAX3421E_INT;
+                MAX3421E_SPI_Settings = SPISettings(UHS_MAX3421E_SPD, MSBFIRST, SPI_MODE0);
+                hub_present = 0;
+        };
+
+        // Will use user supplied pins, and UHS_MAX3421E_SPD
+
+        UHS_NI MAX3421E_HOST(uint8_t pss, uint8_t pirq) {
+                sof_countdown = 0;
+                busevent = false;
+                doingreset = false;
+                sofevent = false;
+                condet = false;
+                ss_pin = pss;
+                irq_pin = pirq;
+                MAX3421E_SPI_Settings = SPISettings(UHS_MAX3421E_SPD, MSBFIRST, SPI_MODE0);
+                hub_present = 0;
+        };
+
+        // Will use user supplied pins, and speed
+
+        UHS_NI MAX3421E_HOST(uint8_t pss, uint8_t pirq, uint32_t pspd) {
+                sof_countdown = 0;
+                doingreset = false;
+                busevent = false;
+                sofevent = false;
+                condet = false;
+                ss_pin = pss;
+                irq_pin = pirq;
+                MAX3421E_SPI_Settings = SPISettings(pspd, MSBFIRST, SPI_MODE0);
+                hub_present = 0;
+        };
+
+        virtual bool UHS_NI sof_delay(uint16_t x) {
+#ifdef USB_HOST_MANUAL_POLL
+                const bool saved_irq_state = enable_frame_irq(true);
+#endif
+                sof_countdown = x;
+                while((sof_countdown != 0) && !condet) {
+                        SYSTEM_OR_SPECIAL_YIELD();
+#if !USB_HOST_SHIELD_USE_ISR
+                        Task();
+#endif
+                }
+#ifdef USB_HOST_MANUAL_POLL
+                enable_frame_irq(saved_irq_state);
+#endif
+                //                Serial.println("...Wake");
+                return (!condet);
+        };
+
+        virtual UHS_EpInfo *ctrlReqOpen(uint8_t addr, uint64_t Request, uint8_t* dataptr);
+
+        virtual void UHS_NI vbusPower(VBUS_t state) {
+                regWr(rPINCTL, (bmFDUPSPI | bmIRQ_SENSE) | (uint8_t)(state));
+        };
+
+        void UHS_NI Task(void);
+
+        virtual uint8_t SetAddress(uint8_t addr, uint8_t ep, UHS_EpInfo **ppep, uint16_t &nak_limit);
+        virtual uint8_t OutTransfer(UHS_EpInfo *pep, uint16_t nak_limit, uint16_t nbytes, uint8_t *data);
+        virtual uint8_t InTransfer(UHS_EpInfo *pep, uint16_t nak_limit, uint16_t *nbytesptr, uint8_t *data);
+        virtual uint8_t ctrlReqClose(UHS_EpInfo *pep, uint8_t bmReqType, uint16_t left, uint16_t nbytes, uint8_t *dataptr);
+        virtual uint8_t ctrlReqRead(UHS_EpInfo *pep, uint16_t *left, uint16_t *read, uint16_t nbytes, uint8_t *dataptr);
+        virtual uint8_t dispatchPkt(uint8_t token, uint8_t ep, uint16_t nak_limit);
+
+        void UHS_NI ReleaseChildren(void) {
+                for(uint8_t i = 0; i < UHS_HOST_MAX_INTERFACE_DRIVERS; i++)
+                        if(devConfig[i])
+                                devConfig[i]->Release();
+                hub_present = 0;
+        };
+
+        virtual bool IsHub(uint8_t klass) {
+                if(klass == UHS_USB_CLASS_HUB) {
+                        hub_present = bmHUBPRE;
+                        return true;
+                }
+                return false;
+        };
+
+        virtual void VBUS_changed(void);
+
+        virtual void UHS_NI doHostReset(void) {
+#if USB_HOST_SHIELD_USE_ISR
+                // Enable interrupts
+                noInterrupts();
+#endif
+                doingreset = true;
+                busevent = true;
+                regWr(rHIRQ, bmBUSEVENTIRQ); // see data sheet.
+                regWr(rHCTL, bmBUSRST); //issue bus reset
+#if USB_HOST_SHIELD_USE_ISR
+                DDSB();
+                // Enable interrupts
+                interrupts();
+#endif
+                while(busevent) {
+                        DDSB();
+                        SYSTEM_OR_SPECIAL_YIELD();
+                }
+#endif
+#if USB_HOST_SHIELD_USE_ISR
+                // Enable interrupts
+                noInterrupts();
+#endif
+                #ifdef USB_HOST_MANUAL_POLL
+                        enable_frame_irq(true);
+                #endif
+                sofevent = true;
+#if USB_HOST_SHIELD_USE_ISR
+                DDSB();
+                // Enable interrupts
+                interrupts();
+#endif
+                // Wait for SOF
+                while(sofevent) {
+                }
+#if USB_HOST_SHIELD_USE_ISR
+                // Enable interrupts
+                noInterrupts();
+#endif
+                doingreset = false;
+#if USB_HOST_SHIELD_USE_ISR
+                DDSB();
+                // Enable interrupts
+                interrupts();
+        };
+
+
+        int16_t UHS_NI Init(int16_t mseconds);
+
+        int16_t UHS_NI Init(void) {
+                return Init(INT16_MIN);
+        };
+
+        void ISRTask(void);
+        void ISRbottom(void);
+        void busprobe(void);
+        uint16_t reset(void);
+
+        // MAX3421e specific
+        void regWr(uint8_t reg, uint8_t data);
+        void gpioWr(uint8_t data);
+        uint8_t regRd(uint8_t reg);
+        uint8_t gpioRd(void);
+        uint8_t* bytesWr(uint8_t reg, uint8_t nbytes, uint8_t* data_p);
+        uint8_t* bytesRd(uint8_t reg, uint8_t nbytes, uint8_t* data_p);
+
+        // ARM/NVIC specific, used to emulate reentrant ISR.
+#if defined(SWI_IRQ_NUM)
+
+        void dyn_SWISR(void) {
+                ISRbottom();
+        };
+#endif
+
+        virtual void UHS_NI suspend_host(void) {
+                // Used on MCU that lack control of IRQ priority (AVR).
+                // Suspends ISRs, for critical code. IRQ will be serviced after it is resumed.
+                // NOTE: you must track the state yourself!
+#if defined(__AVR__)
+                noInterrupts();
+                detachInterrupt(UHS_GET_DPI(irq_pin));
+                interrupts();
+#endif
+        };
+
+        virtual void UHS_NI resume_host(void);
+};
+#if !defined(SPIclass)
+#define SPIclass SPI
+#endif
+#if !defined(USB_HOST_SHIELD_LOADED)
+#include "USB_HOST_SHIELD_INLINE.h"
+#endif
+#else
+#error "define LOAD_USB_HOST_SHIELD in your sketch, never include USB_HOST_SHIELD.h in a driver."
+#endif
+#endif /* USB_HOST_SHIELD_H */

Marlin/src/sd/usb_flashdrive/lib-uhs3/UHS_host/macro_logic.h

@@ -0,0 +1,153 @@
+/*
+ * File:   macro_logic.h
+ * Author: root
+ *
+ * Created on December 22, 2018, 4:49 AM
+ *
+ * To test:
+ * gcc -DAJK_TEST_MACRO_LOGIC -E macro_logic.h
+ *
+ */
+
+#ifndef MACRO_LOGIC_H
+#define	MACRO_LOGIC_H
+
+#define AJK_CAT(a, ...) AJK_PRIMITIVE_CAT(a, __VA_ARGS__)
+#define AJK_PRIMITIVE_CAT(a, ...) a ## __VA_ARGS__
+
+#define AJK_COMPL(b) AJK_PRIMITIVE_CAT(AJK_COMPL_, b)
+#define AJK_COMPL_0 1
+#define AJK_COMPL_1 0
+
+#define AJK_BITAND(x) AJK_PRIMITIVE_CAT(AJK_BITAND_, x)
+#define AJK_BITAND_0(y) 0
+#define AJK_BITAND_1(y) y
+
+#define AJK_INC(x) AJK_PRIMITIVE_CAT(AJK_INC_, x)
+#define AJK_INC_0 1
+#define AJK_INC_1 2
+#define AJK_INC_2 3
+#define AJK_INC_3 4
+#define AJK_INC_4 5
+#define AJK_INC_5 6
+#define AJK_INC_6 7
+#define AJK_INC_7 8
+#define AJK_INC_8 9
+#define AJK_INC_9 10
+#define AJK_INC_10 10
+
+#define AJK_DEC(x) AJK_PRIMITIVE_CAT(AJK_DEC_, x)
+#define AJK_DEC_0 0
+#define AJK_DEC_1 0
+#define AJK_DEC_2 1
+#define AJK_DEC_3 2
+#define AJK_DEC_4 3
+#define AJK_DEC_5 4
+#define AJK_DEC_6 5
+#define AJK_DEC_7 6
+#define AJK_DEC_8 7
+#define AJK_DEC_9 8
+#define AJK_DEC_10 9
+
+#define AJK_CHECK_N(x, n, ...) n
+#define AJK_CHECK(...) AJK_CHECK_N(__VA_ARGS__, 0,)
+#define AJK_PROBE(x) x, 1,
+
+#define AJK_IS_PAREN(x) AJK_CHECK(AJK_IS_PAREN_PROBE x)
+#define AJK_IS_PAREN_PROBE(...) AJK_PROBE(~)
+
+#define AJK_NOT(x) AJK_CHECK(AJK_PRIMITIVE_CAT(AJK_NOT_, x))
+#define AJK_NOT_0 AJK_PROBE(~)
+
+#define AJK_COMPL(b) AJK_PRIMITIVE_CAT(AJK_COMPL_, b)
+#define AJK_COMPL_0 1
+#define AJK_COMPL_1 0
+
+#define AJK_BOOL(x) AJK_COMPL(AJK_NOT(x))
+
+#define AJK_IIF(c) AJK_PRIMITIVE_CAT(AJK_IIF_, c)
+#define AJK_IIF_0(t, ...) __VA_ARGS__
+#define AJK_IIF_1(t, ...) t
+
+#define AJK_IF(c) AJK_IIF(AJK_BOOL(c))
+
+#define AJK_EAT(...)
+#define AJK_EXPAND(...) __VA_ARGS__
+#define AJK_WHEN(c) AJK_IF(c)(AJK_EXPAND, AJK_EAT)
+
+#define AJK_EMPTY()
+#define AJK_DEFER(id) id AJK_EMPTY()
+#define AJK_OBSTRUCT(id) id AJK_DEFER(AJK_EMPTY)()
+
+#define AJK_EVAL(...)  AJK_EVAL1(AJK_EVAL1(AJK_EVAL1(__VA_ARGS__)))
+#define AJK_EVAL1(...) AJK_EVAL2(AJK_EVAL2(AJK_EVAL2(__VA_ARGS__)))
+#define AJK_EVAL2(...) AJK_EVAL3(AJK_EVAL3(AJK_EVAL3(__VA_ARGS__)))
+#define AJK_EVAL3(...) AJK_EVAL4(AJK_EVAL4(AJK_EVAL4(__VA_ARGS__)))
+#define AJK_EVAL4(...) AJK_EVAL5(AJK_EVAL5(AJK_EVAL5(__VA_ARGS__)))
+#define AJK_EVAL5(...) __VA_ARGS__
+
+#define AJK_REPEAT(AJK_count, AJK_macro, ...) \
+    AJK_WHEN(AJK_count) \
+    ( \
+        AJK_OBSTRUCT(AJK_REPEAT_INDIRECT) () \
+        ( \
+            AJK_DEC(AJK_count), AJK_macro, __VA_ARGS__ \
+        ) \
+        AJK_OBSTRUCT(AJK_macro) \
+        ( \
+            AJK_DEC(AJK_count), __VA_ARGS__ \
+        ) \
+    )
+#define AJK_REPEAT_INDIRECT() AJK_REPEAT
+
+#define AJK_WHILE(AJK_pred, AJK_op, ...) \
+    IF(AJK_pred(__VA_ARGS__)) \
+    ( \
+        AJK_OBSTRUCT(AJK_WHILE_INDIRECT) () \
+        ( \
+            AJK_pred, AJK_op, AJK_op(__VA_ARGS__) \
+        ), \
+        __VA_ARGS__ \
+    )
+#define AJK_WHILE_INDIRECT() AJK_WHILE
+
+#define AJK_PRIMITIVE_COMPARE(x, y) AJK_IS_PAREN \
+( \
+    AJK_COMPARE_ ## x ( AJK_COMPARE_ ## y) (())  \
+)
+
+#define AJK_IS_COMPARABLE(x) AJK_IS_PAREN( AJK_CAT(AJK_COMPARE_, x) (()) )
+
+#define AJK_NOT_EQUAL(x, y) \
+AJK_IIF(AJK_BITAND(AJK_IS_COMPARABLE(x))(AJK_IS_COMPARABLE(y)) ) \
+( \
+   AJK_PRIMITIVE_COMPARE, \
+   1 AJK_EAT \
+)(x, y)
+
+#define AJK_EQUAL(x, y) AJK_COMPL(AJK_NOT_EQUAL(x, y))
+
+
+#define AJK_COMMA() ,
+
+#define AJK_COMMA_IF(n) AJK_IF(n)(AJK_COMMA, AJK_EAT)()
+
+
+#define AJK_COMMA_VAR(AJK_count, AJK_v) AJK_COMMA_IF(AJK_count) AJK_v ## AJK_count
+
+#define AJK_MAKE_LIST(AJK_v, AJK_count) AJK_EVAL(AJK_REPEAT(AJK_count, AJK_COMMA_VAR, AJK_v))
+
+#define AJK_FUN(AJK_count, AJK_v, AJK_args, AJK_body) AJK_v ## AJK_count (AJK_args) { AJK_body(AJK_count) }
+#define AJK_MAKE_FUNS(AJK_v, AJK_args, AJK_count, AJK_body) AJK_EVAL(AJK_REPEAT(AJK_count, AJK_FUN, AJK_v, AJK_args, AJK_body))
+#if defined(AJK_TEST_MACRO_LOGIC)
+
+#define BODY(AJKindex) some(C, statement); contaning(a, test[AJKindex]);
+#define ZERO_TIMES_TEST 0
+#define THREE_TIMES_TEST 3
+blank > AJK_MAKE_LIST(VARIABLE_, ZERO_TIMES_TEST) < because zero repeats
+Make 3 comma separated indexed variables : AJK_MAKE_LIST(VARIABLE_, THREE_TIMES_TEST)
+Make 3 bogus function bodies
+AJK_MAKE_FUNS(unsigned Cfunc,(arg1, arg2),3,BODY)
+#endif
+
+#endif	/* MACRO_LOGIC_H */

Marlin/src/sd/usb_flashdrive/lib-uhs3/dyn_SWI/SWI_INLINE.h

@@ -0,0 +1,246 @@
+/*
+ * File:   SWI_INLINE.h
+ * Author: xxxajk@gmail.com
+ *
+ * Created on December 5, 2014, 9:40 AM
+ *
+ * This is the actual library.
+ * There are no 'c' or 'cpp' files.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#ifdef DYN_SWI_H
+#ifndef SWI_INLINE_H
+#define	SWI_INLINE_H
+
+#ifndef SWI_MAXIMUM_ALLOWED
+#define SWI_MAXIMUM_ALLOWED 4
+#endif
+
+
+
+#if defined(__arm__) || defined(ARDUINO_ARCH_PIC32)
+static char dyn_SWI_initied = 0;
+static dyn_SWI* dyn_SWI_LIST[SWI_MAXIMUM_ALLOWED];
+static dyn_SWI* dyn_SWI_EXEC[SWI_MAXIMUM_ALLOWED];
+#if defined(__arm__)
+#if defined(__USE_CMSIS_VECTORS__)
+extern "C" {
+        void (*_VectorsRam[VECTORTABLE_SIZE])(void)__attribute__((aligned(VECTORTABLE_ALIGNMENT)));
+}
+#else
+
+__attribute__((always_inline)) static inline void __DSB(void) {
+        __asm__ volatile ("dsb");
+}
+#endif // defined(__USE_CMSIS_VECTORS__)
+#else // defined(__arm__)
+__attribute__((always_inline)) static inline void __DSB(void) {
+        __asm__ volatile ("sync" : : : "memory");
+}
+#endif // defined(__arm__)
+
+/**
+ * Execute queued class ISR routines.
+ */
+#if defined(ARDUINO_ARCH_PIC32)
+static p32_regset *ifs = ((p32_regset *) & IFS0) + (SWI_IRQ_NUM / 32); //interrupt flag register set
+static p32_regset *iec = ((p32_regset *) & IEC0) + (SWI_IRQ_NUM / 32); //interrupt enable control reg set
+static uint32_t swibit = 1 << (SWI_IRQ_NUM % 32);
+
+void
+#if defined(__PIC32MZXX__)
+        __attribute__((nomips16,at_vector(SWI_VECTOR),interrupt(SWI_IPL)))
+#else
+        __attribute__((interrupt(),nomips16))
+#endif
+        softISR(void) {
+#else
+#if defined(ARDUINO_spresense_ast)
+unsigned int softISR(void) {
+#else
+void softISR(void) {
+#endif
+#endif
+
+        //
+        // TO-DO: Perhaps limit to 8, and inline this?
+        //
+
+
+        // Make a working copy, while clearing the queue.
+        noInterrupts();
+#if defined(ARDUINO_ARCH_PIC32)
+        //ifs->clr = swibit;
+#endif
+        for(int i = 0; i < SWI_MAXIMUM_ALLOWED; i++) {
+                dyn_SWI_EXEC[i] = dyn_SWI_LIST[i];
+                dyn_SWI_LIST[i] = NULL;
+        }
+        __DSB();
+        interrupts();
+
+        // Execute each class SWI
+        for(int i = 0; i < SWI_MAXIMUM_ALLOWED; i++) {
+                if(dyn_SWI_EXEC[i]) {
+#if defined(__DYN_SWI_DEBUG_LED__)
+                        digitalWrite(__DYN_SWI_DEBUG_LED__, HIGH);
+#endif
+                        dyn_SWI_EXEC[i]->dyn_SWISR();
+#if defined(__DYN_SWI_DEBUG_LED__)
+                        digitalWrite(__DYN_SWI_DEBUG_LED__, LOW);
+#endif
+                }
+        }
+#if defined(ARDUINO_ARCH_PIC32)
+        noInterrupts();
+        if(!dyn_SWI_EXEC[0]) ifs->clr = swibit;
+        interrupts();
+#endif
+#if defined(ARDUINO_spresense_ast)
+        return 0;
+#endif
+}
+
+#define DDSB() __DSB()
+#endif
+
+
+#if defined(__arm__)
+#ifndef interruptsStatus
+#define interruptsStatus() __interruptsStatus()
+static inline unsigned char __interruptsStatus(void) __attribute__((always_inline, unused));
+
+static inline unsigned char __interruptsStatus(void) {
+        unsigned int primask;
+        asm volatile ("mrs %0, primask" : "=r" (primask));
+        if(primask) return 0;
+        return 1;
+}
+#endif
+
+/**
+ * Initialize the Dynamic (class) Software Interrupt
+ */
+static void Init_dyn_SWI(void) {
+        if(!dyn_SWI_initied) {
+#if defined(__USE_CMSIS_VECTORS__)
+                uint32_t *X_Vectors = (uint32_t*)SCB->VTOR;
+                for(int i = 0; i < VECTORTABLE_SIZE; i++) {
+                        _VectorsRam[i] = reinterpret_cast<void (*)()>(X_Vectors[i]); /* copy vector table to RAM */
+                }
+                /* relocate vector table */
+                noInterrupts();
+                SCB->VTOR = reinterpret_cast<uint32_t>(&_VectorsRam);
+                DDSB();
+                interrupts();
+#endif
+#if !defined(ARDUINO_spresense_ast)
+                for(int i = 0; i < SWI_MAXIMUM_ALLOWED; i++) dyn_SWI_LIST[i] = NULL;
+                noInterrupts();
+                _VectorsRam[SWI_IRQ_NUM + 16] = reinterpret_cast<void (*)()>(softISR);
+                DDSB();
+                interrupts();
+                NVIC_SET_PRIORITY(SWI_IRQ_NUM, 255);
+                NVIC_ENABLE_IRQ(SWI_IRQ_NUM);
+#endif
+#if defined(__DYN_SWI_DEBUG_LED__)
+                pinMode(__DYN_SWI_DEBUG_LED__, OUTPUT);
+                digitalWrite(__DYN_SWI_DEBUG_LED__, LOW);
+#endif
+                dyn_SWI_initied = 1;
+        }
+}
+
+/**
+ *
+ * @param klass class that extends dyn_SWI
+ * @return 0 on queue full, else returns queue position (ones based)
+ */
+int exec_SWI(const dyn_SWI* klass) {
+        int rc = 0;
+
+        uint8_t irestore = interruptsStatus();
+        // Allow use from inside a critical section...
+        // ... and prevent races if also used inside an ISR
+        noInterrupts();
+        for(int i = 0; i < SWI_MAXIMUM_ALLOWED; i++) {
+                if(!dyn_SWI_LIST[i]) {
+                        rc = 1 + i; // Success!
+                        dyn_SWI_LIST[i] = (dyn_SWI*)klass;
+#if !defined(ARDUINO_spresense_ast)
+                        if(!NVIC_GET_PENDING(SWI_IRQ_NUM)) NVIC_SET_PENDING(SWI_IRQ_NUM);
+#else
+                        // Launch 1-shot timer as an emulated SWI
+                        // Hopefully the value of Zero is legal.
+                        // 1 microsecond latency would suck!
+                        attachTimerInterrupt(softISR, 100);
+#endif
+                        DDSB();
+                        break;
+                }
+        }
+        // Restore interrupts, if they were on.
+        if(irestore) interrupts();
+        return rc;
+}
+#elif defined(ARDUINO_ARCH_PIC32)
+
+/**
+ * Initialize the Dynamic (class) Software Interrupt
+ */
+static void Init_dyn_SWI(void) {
+        if(!dyn_SWI_initied) {
+                uint32_t sreg = disableInterrupts();
+
+                setIntVector(SWI_VECTOR, softISR);
+                setIntPriority(SWI_VECTOR, 1, 1); // Lowest priority, ever.
+                ifs->clr = swibit;
+                iec->clr = swibit;
+                iec->set = swibit;
+                restoreInterrupts(sreg);
+#if defined(__DYN_SWI_DEBUG_LED__)
+                pinMode(__DYN_SWI_DEBUG_LED__, OUTPUT);
+                UHS_PIN_WRITE(__DYN_SWI_DEBUG_LED__, LOW);
+#endif
+        }
+}
+
+/**
+ *
+ * @param klass class that extends dyn_SWI
+ * @return 0 on queue full, else returns queue position (ones based)
+ */
+int exec_SWI(const dyn_SWI* klass) {
+        int rc = 0;
+        uint32_t sreg = disableInterrupts();
+        for(int i = 0; i < SWI_MAXIMUM_ALLOWED; i++) {
+                if(!dyn_SWI_LIST[i]) {
+                        rc = 1 + i; // Success!
+                        dyn_SWI_LIST[i] = (dyn_SWI*)klass;
+                        if(!(ifs->reg & swibit)) ifs->set = swibit;
+                        ;
+                        break;
+                }
+        }
+        restoreInterrupts(sreg);
+        return rc;
+}
+
+#endif /* defined(__arm__) */
+#endif	/* SWI_INLINE_H */
+#else
+#error "Never include SWI_INLINE.h directly, include dyn_SWI.h instead"
+#endif

Marlin/src/sd/usb_flashdrive/lib-uhs3/dyn_SWI/dyn_SWI.h

@@ -0,0 +1,172 @@
+/*
+ * File:   dyn_SWI.h
+ * Author: xxxajk@gmail.com
+ *
+ * Created on December 5, 2014, 9:12 AM
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef DYN_SWI_H
+#define	DYN_SWI_H
+
+
+#if defined(__arm__) || defined(ARDUINO_ARCH_PIC32)
+#if defined(ARDUINO_ARCH_PIC32)
+#include <p32xxxx.h>
+#endif
+#ifdef __cplusplus
+
+#if defined(true)
+#undef true
+#endif
+
+#if defined(false)
+#undef false
+#endif
+
+#endif
+
+#if defined(ARDUINO_spresense_ast)
+#define SWI_IRQ_NUM 666 // because this board is totally evil.
+#elif defined(ARDUINO_ARCH_PIC32)
+#ifndef SWI_IRQ_NUM
+#if defined(_DSPI0_IPL_ISR)
+#define SWI_IPL _DSPI0_IPL_ISR
+#define SWI_VECTOR _DSPI0_ERR_IRQ
+#define SWI_IRQ_NUM _DSPI0_ERR_IRQ
+#elif defined(_PMP_ERROR_IRQ)
+#define SWI_IRQ_NUM _PMP_ERROR_IRQ
+#define SWI_VECTOR _PMP_VECTOR
+#else
+#error SWI_IRQ_NUM and SWI_VECTOR need a definition
+#endif
+#ifdef __cplusplus
+extern "C"
+{
+        void
+#if defined(__PIC32MZXX__)
+                __attribute__((nomips16,at_vector(SWI_VECTOR),interrupt(SWI_IPL)))
+#else
+                __attribute__((interrupt(),nomips16))
+#endif
+                softISR(void);
+}
+#endif
+#endif
+#elif !defined(NVIC_NUM_INTERRUPTS)
+// Assume CMSIS
+#define __USE_CMSIS_VECTORS__
+#if defined(NUMBER_OF_INT_VECTORS)
+#define NVIC_NUM_INTERRUPTS (NUMBER_OF_INT_VECTORS-16)
+#else
+#define NVIC_NUM_INTERRUPTS ((int)PERIPH_COUNT_IRQn)
+#endif
+#define VECTORTABLE_SIZE (NVIC_NUM_INTERRUPTS+16)
+#define VECTORTABLE_ALIGNMENT (0x100ul)
+#define NVIC_GET_ACTIVE(n) NVIC_GetActive((IRQn_Type)n)
+#define NVIC_GET_PENDING(n) NVIC_GetPendingIRQ((IRQn_Type)n)
+#define NVIC_SET_PENDING(n) NVIC_SetPendingIRQ((IRQn_Type)n)
+#define NVIC_ENABLE_IRQ(n) NVIC_EnableIRQ((IRQn_Type)n)
+#define NVIC_SET_PRIORITY(n ,p) NVIC_SetPriority((IRQn_Type)n, (uint32_t) p)
+//extern "C" {
+//        extern uint32_t _VectorsRam[VECTORTABLE_SIZE] __attribute__((aligned(VECTORTABLE_ALIGNMENT)));
+//}
+
+#ifndef SWI_IRQ_NUM
+#if defined(__SAM3X8E__) && defined(_VARIANT_ARDUINO_DUE_X_)
+// DUE
+// Choices available:
+// HSMCI_IRQn Multimedia Card Interface (HSMCI)
+// EMAC_IRQn Ethernet MAC (EMAC)
+// EMAC is not broken out on the official DUE, but is on clones.
+// SPI0_IRQn Serial Peripheral Interface (SPI0)
+// SPI0_IRQn seems to be the best choice, as long as nobody uses an ISR based master
+#define SWI_IRQ_NUM SPI0_IRQn
+#elif defined(ARDUINO_SAMD_ZERO)
+// Just use sercom4's unused IRQ vector.
+#define SWI_IRQ_NUM I2S_IRQn
+//#define SWI_IRQ_NUM SERCOM4_IRQn
+#endif
+#endif
+
+#ifndef SWI_IRQ_NUM
+#error SWI_IRQ_NUM not defined (CMSIS)
+#endif
+
+#elif defined(CORE_TEENSY)
+
+#ifndef NVIC_GET_ACTIVE
+#define NVIC_GET_ACTIVE(n)	(*((volatile uint32_t *)0xE000E300 + ((n) >> 5)) & (1 << ((n) & 31)))
+#endif
+#ifndef NVIC_GET_PENDING
+#define NVIC_GET_PENDING(n)	(*((volatile uint32_t *)0xE000E200 + ((n) >> 5)) & (1 << ((n) & 31)))
+#ifndef SWI_IRQ_NUM
+#if defined(__MK20DX256__)
+#define SWI_IRQ_NUM 17
+#elif defined(__MK20DX128__)
+#define SWI_IRQ_NUM 5
+#elif defined(__MKL26Z64__)
+#define SWI_IRQ_NUM 4
+#elif defined(__MK66FX1M0__)
+#define SWI_IRQ_NUM 30
+#elif defined(__MK64FX512__)
+#define SWI_IRQ_NUM 30
+#elif defined(__IMXRT1052__) || defined(__IMXRT1062__)
+#define SWI_IRQ_NUM 71
+#else
+#error Do not know how to relocate IRQ vectors for this pjrc product
+#endif
+#endif
+#endif
+#else // Not CMSIS or PJRC CORE_TEENSY or PIC32 or SPRESENSE
+#error Do not know how to relocate IRQ vectors or perform SWI
+#endif // SWI_IRQ_NUM
+
+
+#ifndef SWI_IRQ_NUM
+#error SWI_IRQ_NUM not defined
+#else
+/**
+ * Use this class to extend your class, in order to provide
+ * a C++ context callable SWI.
+ */
+class dyn_SWI {
+public:
+
+        /**
+         * Override this method with your code.
+         */
+        virtual void dyn_SWISR(void) {
+        };
+};
+
+extern int exec_SWI(const dyn_SWI* klass);
+
+#include "SWI_INLINE.h"
+
+// IMPORTANT! Define this so that you do NOT end up with a NULL stub!
+#define SWI_NO_STUB
+#endif /* SWI_IRQ_NUM */
+#endif /* __arm__ */
+
+// if no SWI for CPU (e.g. AVR) make a void stub.
+#ifndef SWI_NO_STUB
+#define Init_dyn_SWI() (void(0))
+#if !defined(DDSB)
+#define DDSB() (void(0))
+#endif
+#endif
+#endif	/* DYN_SWI_H */

Marlin/src/sd/usb_flashdrive/usb-2.0-host-library-changes.patch

@@ -1,187 +0,0 @@
-diff -Naur /home/aleph/Downloads/USB_Host_Shield_2.0-master/masstorage.cpp lib/masstorage.cpp
---- /home/aleph/Downloads/USB_Host_Shield_2.0-master/masstorage.cpp	2018-09-21 10:19:36.107502252 -0600
-+++ lib/masstorage.cpp	2018-09-21 09:46:19.620175519 -0600
-@@ -24,6 +24,8 @@
- 
- #include "masstorage.h"
- 
-+#if ENABLED(USB_FLASH_DRIVE_SUPPORT)
-+
- const uint8_t BulkOnly::epDataInIndex = 1;
- const uint8_t BulkOnly::epDataOutIndex = 2;
- const uint8_t BulkOnly::epInterruptInIndex = 3;
-@@ -796,6 +798,9 @@
-                 buf[i] = 0x00;
-         }
-         WriteOk[lun] = true;
-+        #if ENABLED(USB_FLASH_DRIVE_SUPPORT) && defined(SKIP_WRITE_PROTECT)
-+          return 0;
-+        #endif
-         uint8_t rc = ModeSense6(lun, 0, 0x3f, 0, 192, buf);
-         if(!rc) {
-                 WriteOk[lun] = ((buf[2] & 0x80) == 0);
-@@ -1271,3 +1276,5 @@
-         return MASS_ERR_NOT_IMPLEMENTED;
- #endif
- }
-+
-+#endif // USB_FLASH_DRIVE_SUPPORT
-\ No newline at end of file
-diff -Naur /home/aleph/Downloads/USB_Host_Shield_2.0-master/message.cpp lib/message.cpp
---- /home/aleph/Downloads/USB_Host_Shield_2.0-master/message.cpp	2018-09-21 10:20:15.995647957 -0600
-+++ lib/message.cpp	2018-09-19 07:43:46.520339375 -0600
-@@ -23,6 +23,9 @@
-  */
- 
- #include "Usb.h"
-+
-+#if ENABLED(USB_FLASH_DRIVE_SUPPORT)
-+
- // 0x80 is the default (i.e. trace) to turn off set this global to something lower.
- // this allows for 126 other debugging levels.
- // TO-DO: Allow assignment to a different serial port by software
-@@ -120,4 +123,6 @@
-         D_PrintHex<uint8_t > (rcode, 0x80);
-         Notify(PSTR("\r\n"), 0x80);
- }
--#endif
-+#endif // DEBUG_USB_HOST
-+
-+#endif // USB_FLASH_DRIVE_SUPPORT
-\ No newline at end of file
-diff -Naur /home/aleph/Downloads/USB_Host_Shield_2.0-master/parsetools.cpp lib/parsetools.cpp
---- /home/aleph/Downloads/USB_Host_Shield_2.0-master/parsetools.cpp	2018-09-21 10:21:16.215867769 -0600
-+++ lib/parsetools.cpp	2018-09-19 07:43:46.520339375 -0600
-@@ -23,6 +23,8 @@
-  */
- #include "Usb.h"
- 
-+#if ENABLED(USB_FLASH_DRIVE_SUPPORT)
-+
- bool MultiByteValueParser::Parse(uint8_t **pp, uint16_t *pcntdn) {
-         if(!pBuf) {
-                 Notify(PSTR("Buffer pointer is NULL!\r\n"), 0x80);
-@@ -72,3 +74,5 @@
-         }
-         return true;
- }
-+
-+#endif // USB_FLASH_DRIVE_SUPPORT
-\ No newline at end of file
-diff -Naur /home/aleph/Downloads/USB_Host_Shield_2.0-master/settings.h lib/settings.h
---- /home/aleph/Downloads/USB_Host_Shield_2.0-master/settings.h	2018-09-21 10:22:21.792106872 -0600
-+++ lib/settings.h	2018-09-21 10:01:53.383594081 -0600
-@@ -25,7 +25,21 @@
- #ifndef USB_HOST_SHIELD_SETTINGS_H
- #define USB_HOST_SHIELD_SETTINGS_H
- #include "macros.h"
--
-+#if ENABLED(USB_FLASH_DRIVE_SUPPORT)
-+  ////////////////////////////////////////////////////////////////////////////////
-+  /* Added by Bill Greiman to speed up mass storage initialization with USB
-+   * flash drives and simple USB hard drives.
-+   * Disable this by defining DELAY(x) to be delay(x).
-+   */
-+  #define delay(x)  if((x) < 200) safe_delay(x)
-+  /* Almost all USB flash drives and simple USB hard drives fail the write
-+   * protect test and add 20 - 30 seconds to USB init.  Set SKIP_WRITE_PROTECT
-+   * to nonzero to skip the test and assume the drive is writable.
-+   */
-+  #define SKIP_WRITE_PROTECT 1
-+  /* Since Marlin only cares about USB flash drives, we only need one LUN. */
-+  #define MASS_MAX_SUPPORTED_LUN 1
-+#endif
- ////////////////////////////////////////////////////////////////////////////////
- // SPI Configuration
- ////////////////////////////////////////////////////////////////////////////////
-@@ -45,6 +59,10 @@
-  * multiple serial ports are available.
-  * For example Serial3.
-  */
-+#if ENABLED(USB_FLASH_DRIVE_SUPPORT)
-+  #define USB_HOST_SERIAL MYSERIAL0
-+#endif
-+
- #ifndef USB_HOST_SERIAL
- #define USB_HOST_SERIAL Serial
- #endif
-@@ -99,7 +117,7 @@
- // No user serviceable parts below this line.
- // DO NOT change anything below here unless you are a developer!
- 
--#include "version_helper.h"
-+//#include "version_helper.h"
- 
- #if defined(__GNUC__) && defined(__AVR__)
- #ifndef GCC_VERSION
-@@ -149,7 +167,6 @@
- #else
- #define USING_SPI4TEENSY3 0
- #endif
--
- #if ((defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)) || defined(__ARDUINO_X86__) || ARDUINO >= 10600) && !USING_SPI4TEENSY3
- #include <SPI.h> // Use the Arduino SPI library for the Arduino Due, Intel Galileo 1 & 2, Intel Edison or if the SPI library with transaction is available
- #endif
-diff -Naur /home/aleph/Downloads/USB_Host_Shield_2.0-master/UsbCore.h lib/UsbCore.h
---- /home/aleph/Downloads/USB_Host_Shield_2.0-master/UsbCore.h	2018-09-21 10:23:09.348280107 -0600
-+++ lib/UsbCore.h	2018-09-19 07:43:46.520339375 -0600
-@@ -32,7 +32,10 @@
- //#define USB_METHODS_INLINE
- 
- /* shield pins. First parameter - SS pin, second parameter - INT pin */
--#ifdef BOARD_BLACK_WIDDOW
-+
-+#if defined(__MARLIN_H__)
-+typedef MAX3421e MAX3421E; // Marlin redefines this class in "../usb_host.h"
-+#elif defined(BOARD_BLACK_WIDDOW)
- typedef MAX3421e<P6, P3> MAX3421E; // Black Widow
- #elif defined(CORE_TEENSY) && (defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB1286__))
- #if EXT_RAM
-diff -Naur /home/aleph/Downloads/USB_Host_Shield_2.0-master/Usb.cpp lib/Usb.cpp
---- /home/aleph/Downloads/USB_Host_Shield_2.0-master/Usb.cpp	2018-09-21 10:23:20.732321559 -0600
-+++ lib/Usb.cpp	2018-09-19 07:43:46.520339375 -0600
-@@ -25,6 +25,8 @@
- 
- #include "Usb.h"
- 
-+#if ENABLED(USB_FLASH_DRIVE_SUPPORT)
-+
- static uint8_t usb_error = 0;
- static uint8_t usb_task_state;
- 
-@@ -825,3 +827,4 @@
- }
- 
- #endif // defined(USB_METHODS_INLINE)
-+#endif // USB_FLASH_DRIVE_SUPPORT
-diff -Naur /home/aleph/Downloads/USB_Host_Shield_2.0-master/Usb.h lib/Usb.h
---- /home/aleph/Downloads/USB_Host_Shield_2.0-master/Usb.h	2018-09-21 10:23:33.756368972 -0600
-+++ lib/Usb.h	2018-09-19 07:43:46.520339375 -0600
-@@ -25,6 +25,8 @@
- #ifndef _usb_h_
- #define _usb_h_
- 
-+#include "../../../Marlin.h"
-+
- // WARNING: Do not change the order of includes, or stuff will break!
- #include <inttypes.h>
- #include <stddef.h>
-@@ -34,13 +36,15 @@
- #include "settings.h"
- #include "printhex.h"
- #include "message.h"
-+
- #include "hexdump.h"
--#include "sink_parser.h"
-+//#include "sink_parser.h"
- #include "max3421e.h"
- #include "address.h"
--#include "avrpins.h"
-+//#include "avrpins.h"
- #include "usb_ch9.h"
--#include "usbhost.h"
-+//#include "usbhost.h"
-+#include "../usb_host.h"
- #include "UsbCore.h"
- #include "parsetools.h"
- #include "confdescparser.h"

config/default/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/3DFabXYZ/Migbot/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/ADIMLab/Granty v2/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is required for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/AlephObjects/TAZ4/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Alfawise/U20/Configuration_adv.h

@@ -1021,17 +1021,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/AliExpress/UM2pExt/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Anet/A2/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Anet/A2plus/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Anet/A6/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Anet/A8/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Anet/A8plus/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Anet/E16/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/AnyCubic/i3/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/ArmEd/Configuration_adv.h

@@ -1022,17 +1022,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/BIBO/TouchX/cyclops/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/BIBO/TouchX/default/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/BQ/Hephestos/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/BQ/Hephestos_2/Configuration_adv.h

@@ -1026,17 +1026,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/BQ/WITBOX/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Cartesio/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Creality/CR-10/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Creality/CR-10S/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Creality/CR-10_5S/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Creality/CR-10mini/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Creality/CR-20 Pro/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Creality/CR-20/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Creality/CR-8/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Creality/Ender-2/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Creality/Ender-3/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Creality/Ender-4/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Creality/Ender-5/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Dagoma/Disco Ultimate/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/EVNOVO (Artillery)/Sidewinder X1/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Einstart-S/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/FYSETC/AIO_II/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/FYSETC/Cheetah 1.2/BLTouch/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/FYSETC/Cheetah 1.2/base/Configuration_adv.h

@@ -1017,17 +1017,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/FYSETC/Cheetah/BLTouch/Configuration_adv.h

@@ -1017,17 +1017,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/FYSETC/Cheetah/base/Configuration_adv.h

@@ -1017,17 +1017,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Felix/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/FlashForge/CreatorPro/Configuration_adv.h

@@ -1017,17 +1017,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/FolgerTech/i3-2020/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Formbot/Raptor/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Formbot/T_Rex_2+/Configuration_adv.h

@@ -1022,17 +1022,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Formbot/T_Rex_3/Configuration_adv.h

@@ -1022,17 +1022,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Geeetech/A10/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Geeetech/A10M/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Geeetech/A20M/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Geeetech/MeCreator2/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Geeetech/Prusa i3 Pro C/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**

config/examples/Geeetech/Prusa i3 Pro W/Configuration_adv.h

@@ -1018,17 +1018,31 @@
    * equivalent MAX3421E breakout board. The USB thumb drive will appear
    * to Marlin as an SD card.
    *
-   * The MAX3421E must be assigned the same pins as the SD card reader, with
+   * The MAX3421E can be assigned the same pins as the SD card reader, with
    * the following pin mapping:
    *
    *    SCLK, MOSI, MISO --> SCLK, MOSI, MISO
-   *    INT              --> SD_DETECT_PIN
+   *    INT              --> SD_DETECT_PIN [1]
    *    SS               --> SDSS
+   *
+   * [1] On AVR an interrupt-capable pin is best for UHS3 compatibility.
    */
   //#define USB_FLASH_DRIVE_SUPPORT
   #if ENABLED(USB_FLASH_DRIVE_SUPPORT)
     #define USB_CS_PIN    SDSS
     #define USB_INTR_PIN  SD_DETECT_PIN
+
+    /**
+     * USB Host Shield Library
+     *
+     * - UHS2 uses no interrupts and has been production-tested
+     *   on a LulzBot TAZ Pro with a 32-bit Archim board.
+     *
+     * - UHS3 is newer code with better USB compatibility. But it
+     *   is less tested and is known to interfere with Servos.
+     *   [1] This requires USB_INTR_PIN to be interrupt-capable.
+     */
+    //#define USE_UHS3_USB
   #endif
 
   /**