Add GT2560 v3 support (#11914)

Marlin/src/core/boards.h

@@ -83,6 +83,7 @@
 #define BOARD_TRIGORILLA_13     343   // TriGorilla Anycubic version 1.3 based on RAMPS EFB
 #define BOARD_TRIGORILLA_14     443   // TriGorilla Anycubic version 1.4 based on RAMPS EFB
 #define BOARD_RAMPS_ENDER_4     243   // Creality: Ender-4, CR-8
+#define BOARD_GT2560_V3         76    // Geeetech A10
 
 //
 // Other ATmega1280, ATmega2560

Marlin/src/pins/pins.h

@@ -150,6 +150,8 @@
   #include "pins_TRIGORILLA_14.h"     // ATmega2560                                 env:megaatmega2560
 #elif MB(RAMPS_ENDER_4)
   #include "pins_RAMPS_ENDER_4.h"     // ATmega2560                                 env:megaatmega2560
+#elif MB(GT2560_V3)
+  #include "pins_GT2560_V3.h"         // ATmega2560                                 env:megaatmega2560
 
 //
 // Other ATmega1280, ATmega2560

Marlin/src/pins/pins_FORMBOT_TREX2PLUS.h

@@ -143,6 +143,7 @@
 #define HEATER_BED_PIN     58
 
 #define FAN_PIN             9
+
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_PIN    4
   //#define FIL_RUNOUT2_PIN  -1

Marlin/src/pins/pins_GT2560_V3.h

@@ -0,0 +1,124 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+
+/**
+ * GT2560 V3.0 pin assignment
+ */
+
+#if !defined(__AVR_ATmega1280__) && !defined(__AVR_ATmega2560__)
+  #error "Oops!  Make sure you have 'Arduino Mega' selected from the 'Tools -> Boards' menu."
+#endif
+
+#ifndef BOARD_NAME
+  #define BOARD_NAME "GT2560 V3.0"
+#endif
+
+//
+// Limit Switches
+//
+#define X_MIN_PIN          24
+#define X_MAX_PIN          22
+#define Y_MIN_PIN          28
+#define Y_MAX_PIN          26
+#define Z_MIN_PIN          30
+#define Z_MAX_PIN          32
+
+//
+// Z Probe (when not Z_MIN_PIN)
+//
+#ifndef Z_MIN_PROBE_PIN
+  #define Z_MIN_PROBE_PIN  32
+#endif
+
+//
+// Steppers
+//
+#define X_STEP_PIN         37
+#define X_DIR_PIN          39
+#define X_ENABLE_PIN       35
+
+#define Y_STEP_PIN         31
+#define Y_DIR_PIN          33
+#define Y_ENABLE_PIN       29
+
+#define Z_STEP_PIN         25
+#define Z_DIR_PIN          23
+#define Z_ENABLE_PIN       27
+
+#define E0_STEP_PIN        46
+#define E0_DIR_PIN         44
+#define E0_ENABLE_PIN      12
+
+#define E1_STEP_PIN        49
+#define E1_DIR_PIN         47
+#define E1_ENABLE_PIN      48
+
+//
+// Temperature Sensors
+//
+#define TEMP_0_PIN         11   // Analog Input
+#define TEMP_1_PIN          9   // Analog Input
+#define TEMP_2_PIN          1   // Analog Input
+#define TEMP_BED_PIN       10   // Analog Input
+
+//
+// Heaters / Fans
+//
+#define HEATER_0_PIN       10
+#define HEATER_1_PIN        3
+#define HEATER_2_PIN        1
+#define HEATER_BED_PIN      4
+#define FAN_PIN             9
+
+//
+// Misc. Functions
+//
+#define SD_DETECT_PIN      38
+#define SDSS               53
+#define LED_PIN             6
+#define PS_ON_PIN          12
+#define SUICIDE_PIN        54   //PIN that has to be turned on right after start, to keep power flowing.
+#define SERVO0_PIN         11   //13 untested  3Dtouch
+
+#ifndef CASE_LIGHT_PIN
+  //#define CASE_LIGHT_PIN 21
+  #define CASE_LIGHT_PIN    6
+#endif
+
+//
+// LCD Controller
+//
+#define BEEPER_PIN         18
+
+#define LCD_PINS_RS        20
+#define LCD_PINS_ENABLE    17
+#define LCD_PINS_D4        16
+#define LCD_PINS_D5        21
+#define LCD_PINS_D6         5
+#define LCD_PINS_D7        36
+
+#if ENABLED(NEWPANEL)
+  #define BTN_EN1          42
+  #define BTN_EN2          40
+  #define BTN_ENC          19
+#endif