Fix issue MarlinFirmware#1 where M600 did not work. Also implemented …

…advanced pause and parging feature and fixed bug, which prevents resuming from pared nozzle.

Marlin/Configuration_adv.h

@@ -1870,7 +1870,7 @@
  * Requires NOZZLE_PARK_FEATURE.
  * This feature is required for the default FILAMENT_RUNOUT_SCRIPT.
  */
-//#define ADVANCED_PAUSE_FEATURE
+#define ADVANCED_PAUSE_FEATURE
 #if ENABLED(ADVANCED_PAUSE_FEATURE)
   #define PAUSE_PARK_RETRACT_FEEDRATE         60  // (mm/s) Initial retract feedrate.
   #define PAUSE_PARK_RETRACT_LENGTH            4  // (mm) Initial retract.

Marlin/src/lcd/anycubic_touchscreen.cpp

@@ -184,6 +184,8 @@ void AnycubicTouchscreenClass::StartPrint()
     SERIAL_ECHOLNPGM("DEBUG: M24 Resume from regular pause");
 #endif
     IsParked = false; // remove parked flag
+    wait_for_heatup = false;
+    wait_for_user = false;
     starttime = millis();
     card.startFileprint(); // resume regularly
     TFTstate = ANYCUBIC_TFT_STATE_SDPRINT;
@@ -213,6 +215,7 @@ void AnycubicTouchscreenClass::StartPrint()
     SERIAL_ECHOLNPGM("DEBUG: M24 Resume from Filament Runout");
 #endif
     IsParked = false; // clear flags
+    wait_for_user = false;
     ai3m_pause_state = 0;
 #ifdef ANYCUBIC_TFT_DEBUG
     SERIAL_ECHOLNPGM("DEBUG: Filament Pause Flag cleared");
@@ -325,15 +328,15 @@ void AnycubicTouchscreenClass::StopPrint()
 
 void AnycubicTouchscreenClass::FilamentChangeResume()
 {
+  wait_for_user = false;  //must be done twice, since we have a bug in marlin
+  wait_for_heatup = false;
   // call M108 to break out of M600 pause
   queue.inject_P(PSTR("M108"));
 #ifdef ANYCUBIC_TFT_DEBUG
   SERIAL_ECHOLNPGM("DEBUG: M108 Resume called");
 #endif
-
-  wait_for_heatup = false;
   wait_for_user = false;
-
+  wait_for_heatup = false;
   // resume with proper progress state
   card.startFileprint();
 #ifdef ANYCUBIC_TFT_DEBUG