From 340d165a9cb87dfbfbacc680989717c79b5bdffe Mon Sep 17 00:00:00 2001
From: AnHardt <github@kitelab.de>
Date: Sat, 4 Apr 2015 22:02:24 +0200
Subject: [PATCH] Reduce display updates for dogm displays

In 'if (encoderPastThreshold || LCD_CLICKED)' lcdDrawUpdate was not set.

'lcd_status_update_delay'-loop was not effective in  function
lcd_status_screen().
The loop prevented the update of the status screen but not the displays
update.
Shifted the loop into lcd_update().
---
 Marlin/dogm_lcd_implementation.h |  4 ++--
 Marlin/ultralcd.cpp              | 37 ++++++++++++++------------------
 2 files changed, 18 insertions(+), 23 deletions(-)

diff --git a/Marlin/dogm_lcd_implementation.h b/Marlin/dogm_lcd_implementation.h
index 81234c0f01..c057e56425 100644
--- a/Marlin/dogm_lcd_implementation.h
+++ b/Marlin/dogm_lcd_implementation.h
@@ -318,9 +318,9 @@ static void lcd_implementation_status_screen() {
   lcd_setFont(FONT_STATUSMENU);
 
   #ifdef USE_SMALL_INFOFONT
-    u8g.drawBox(0,30,127,10);
+    u8g.drawBox(0,30,128,10);
   #else
-    u8g.drawBox(0,30,127,9);
+    u8g.drawBox(0,30,128,9);
   #endif
   u8g.setColorIndex(0); // white on black
   u8g.setPrintPos(2,XYZ_BASELINE);
diff --git a/Marlin/ultralcd.cpp b/Marlin/ultralcd.cpp
index 1c124a0062..034adc3942 100644
--- a/Marlin/ultralcd.cpp
+++ b/Marlin/ultralcd.cpp
@@ -262,8 +262,7 @@ static void lcd_goto_menu(menuFunc_t menu, const uint32_t encoder=0, const bool
 }
 
 /* Main status screen. It's up to the implementation specific part to show what is needed. As this is very display dependent */
-static void lcd_status_screen()
-{
+static void lcd_status_screen() {
 	encoderRateMultiplierEnabled = false;
 
   #ifdef LCD_PROGRESS_BAR
@@ -296,15 +295,7 @@ static void lcd_status_screen()
     #endif
   #endif //LCD_PROGRESS_BAR
 
-  if (lcd_status_update_delay)
-    lcd_status_update_delay--;
-  else
-    lcdDrawUpdate = 1;
-
-  if (lcdDrawUpdate) {
     lcd_implementation_status_screen();
-    lcd_status_update_delay = 10;   /* redraw the main screen every second. This is easier then trying keep track of all things that change on the screen */
-  }
 
 #ifdef ULTIPANEL
 
@@ -1298,8 +1289,6 @@ void lcd_update() {
       }
     }
   #endif//CARDINSERTED
-
-  static uint8_t dotcounter = 63;
   
   uint32_t ms = millis();
   if (ms > lcd_next_update_millis) {
@@ -1351,27 +1340,33 @@ void lcd_update() {
             } // encoderRateMultiplierEnabled
           #endif //ENCODER_RATE_MULTIPLIER
 
-          lcdDrawUpdate = 1;
           encoderPosition += (encoderDiff * encoderMultiplier) / ENCODER_PULSES_PER_STEP;
           encoderDiff = 0;
         }
         timeoutToStatus = ms + LCD_TIMEOUT_TO_STATUS;
+        lcdDrawUpdate = 1;
       }
-
     #endif //ULTIPANEL
 
+    if (currentMenu == lcd_status_screen) {
+      if (!lcd_status_update_delay) {
+        lcdDrawUpdate = 1;
+        lcd_status_update_delay = 10;   /* redraw the main screen every second. This is easier then trying keep track of all things that change on the screen */
+      }
+      else {
+        lcd_status_update_delay--;
+      }
+    }
     #ifdef DOGLCD  // Changes due to different driver architecture of the DOGM display
-      blink++;     // Variable for fan animation and alive dot
-      u8g.firstPage();
-      (*currentMenu)();
       if (lcdDrawUpdate) {
+        blink++;     // Variable for fan animation and alive dot
+        u8g.firstPage();
         do {
-          if (!dotcounter) dotcounter = 63;
           lcd_setFont(FONT_MENU);
           u8g.setPrintPos(125, 0);
-  //        if (blink % 2) u8g.setColorIndex(1); else u8g.setColorIndex(0); // Set color for the alive dot
-          u8g.drawPixel(127, dotcounter--); // draw alive dot
-  //        u8g.setColorIndex(1); // black on white
+          if (blink % 2) u8g.setColorIndex(1); else u8g.setColorIndex(0); // Set color for the alive dot
+          u8g.drawPixel(127, 63); // draw alive dot
+          u8g.setColorIndex(1); // black on white
           (*currentMenu)();
         } while( u8g.nextPage() );
       }