From a94e58876522bc0f8cb856f91c5609722ffb08df Mon Sep 17 00:00:00 2001
From: Erik van der Zalm <erik@vdzalm.eu>
Date: Sun, 17 Nov 2013 17:41:30 +0100
Subject: [PATCH] Changed slow buttons behavior.

---
 Marlin/Configuration_adv.h |  2 +-
 Marlin/ultralcd.cpp        | 15 ++++++++++++---
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
index 103bb538f..7b3ef4aed 100644
--- a/Marlin/Configuration_adv.h
+++ b/Marlin/Configuration_adv.h
@@ -366,7 +366,7 @@ const unsigned int dropsegments=5; //everything with less than this number of st
 #endif
 
 // Control heater 0 and heater 1 in parallel.
-#define HEATERS_PARALLEL
+//#define HEATERS_PARALLEL
 
 //===========================================================================
 //=============================Buffers           ============================
diff --git a/Marlin/ultralcd.cpp b/Marlin/ultralcd.cpp
index e3e2556fa..163c881e1 100644
--- a/Marlin/ultralcd.cpp
+++ b/Marlin/ultralcd.cpp
@@ -142,6 +142,9 @@ volatile uint8_t buttons;//Contains the bits of the currently pressed buttons.
 #else
 volatile uint8_t buttons_reprapworld_keypad; // to store the reprapworld_keypad shiftregister values
 #endif
+#ifdef LCD_HAS_SLOW_BUTTONS
+volatile uint8_t slow_buttons;//Contains the bits of the currently pressed buttons.
+#endif
 uint8_t currentMenuViewOffset;              /* scroll offset in the current menu */
 uint32_t blocking_enc;
 uint8_t lastEncoderBits;
@@ -1013,6 +1016,9 @@ void lcd_init()
     WRITE(SDCARDDETECT, HIGH);
     lcd_oldcardstatus = IS_SD_INSERTED;
 #endif//(SDCARDDETECT > 0)
+    #ifdef LCD_HAS_SLOW_BUTTONS
+    slow_buttons = 0;
+    #endif
     lcd_buttons_update();
 #ifdef ULTIPANEL    
     encoderDiff = 0;
@@ -1023,12 +1029,12 @@ void lcd_update()
 {
     static unsigned long timeoutToStatus = 0;
     
-    lcd_buttons_update();
-    
     #ifdef LCD_HAS_SLOW_BUTTONS
-    buttons |= lcd_implementation_read_slow_buttons(); // buttons which take too long to read in interrupt context
+    slow_buttons = lcd_implementation_read_slow_buttons(); // buttons which take too long to read in interrupt context
     #endif
     
+    lcd_buttons_update();
+    
     #if (SDCARDDETECT > 0)
     if((IS_SD_INSERTED != lcd_oldcardstatus))
     {
@@ -1170,6 +1176,9 @@ void lcd_buttons_update()
         newbutton |= EN_C;
   #endif
     buttons = newbutton;
+    #ifdef LCD_HAS_SLOW_BUTTONS
+    buttons |= slow_buttons;
+    #endif
     #ifdef REPRAPWORLD_KEYPAD
       // for the reprapworld_keypad
       uint8_t newbutton_reprapworld_keypad=0;