ultralcd can now also stop the wait loop for the hot-end m109 heating when stopping sd prints.

Marlin/Marlin.h

@@ -131,5 +131,6 @@ extern float homing_feedrate[];
 extern bool axis_relative_modes[];
 extern float current_position[NUM_AXIS] ;
 extern float add_homeing[3];
+extern bool stop_heating_wait;
 
 #endif

Marlin/Marlin.pde

@@ -138,7 +138,7 @@ int saved_feedmultiply;
 volatile bool feedmultiplychanged=false;
 float current_position[NUM_AXIS] = {  0.0, 0.0, 0.0, 0.0};
 float add_homeing[3]={0,0,0};
-
+bool stop_heating_wait=false;
 //===========================================================================
 //=============================private variables=============================
 //===========================================================================
@@ -825,6 +825,7 @@ FORCE_INLINE void process_commands()
         }
         manage_heater();
         LCD_STATUS;
+        if(stop_heating_wait) break;
         #ifdef TEMP_RESIDENCY_TIME
             /* start/restart the TEMP_RESIDENCY_TIME timer whenever we reach target temp for the first time
               or when current temp falls outside the hysteresis after target temp was reached */

Marlin/cardreader.pde

@@ -434,6 +434,7 @@ void CardReader::printingHasFinished()
 {
  quickStop();
  sdprinting = false;
+ stop_heating_wait=true;
  if(SD_FINISHED_STEPPERRELEASE)
  {
    //finishAndDisableSteppers();