Merge pull request #1581 from msutas/Development

Filament Runout Sensor Feature

Marlin/Configuration.h

 #define Y_MAX_LENGTH (Y_MAX_POS - Y_MIN_POS)
 #define Z_MAX_LENGTH (Z_MAX_POS - Z_MIN_POS)
 
+//===========================================================================
+//============================= Filament Runout Sensor ======================
+//===========================================================================
+//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
+                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // It is assumed that when logic high = filament available
+                                 //                    when logic  low = filament ran out
+//const bool FIL_RUNOUT_INVERTING = true;  // Should be uncommented and true or false should assigned
+//#define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
 
 //===========================================================================
 //============================= Bed Auto Leveling ===========================

Marlin/Marlin.h

 void kill();
 void Stop();
 
+#ifdef FILAMENT_RUNOUT_SENSOR
+void filrunout();
+#endif
+
 bool IsStopped();
 
 bool enquecommand(const char *cmd); //put a single ASCII command at the end of the current buffer or return false when it is full

Marlin/Marlin_main.cpp

   int meas_delay_cm = MEASUREMENT_DELAY_CM;  //distance delay setting
 #endif
 
+#ifdef FILAMENT_RUNOUT_SENSOR
+   static bool filrunoutEnqued = false;
+#endif
+
 const char errormagic[] PROGMEM = "Error:";
 const char echomagic[] PROGMEM = "echo:";
 
   #endif
 }
 
+void setup_filrunoutpin()
+{
+#if defined(FILRUNOUT_PIN) && FILRUNOUT_PIN > -1
+   pinMode(FILRUNOUT_PIN,INPUT);
+   #if defined(ENDSTOPPULLUP_FIL_RUNOUT)
+      WRITE(FILLRUNOUT_PIN,HIGH);
+   #endif
+#endif
+}
+
 // Set home pin
 void setup_homepin(void)
 {
 void setup()
 {
   setup_killpin();
+  setup_filrunoutpin();
   setup_powerhold();
   MYSERIAL.begin(BAUDRATE);
   SERIAL_PROTOCOLLNPGM("start");
       plan_buffer_line(lastpos[X_AXIS], lastpos[Y_AXIS], lastpos[Z_AXIS], target[E_AXIS], fr60, active_extruder); //move z back
       plan_buffer_line(lastpos[X_AXIS], lastpos[Y_AXIS], lastpos[Z_AXIS], lastpos[E_AXIS], fr60, active_extruder); //final untretract
     #endif        
+
+    #ifdef FILAMENT_RUNOUT_SENSOR
+      filrunoutEnqued = false;
+    #endif
+    
   }
 
 #endif // FILAMENTCHANGEENABLE
    const int KILL_DELAY = 10000;
 #endif
 
+#if defined(FILRUNOUT_PIN) && FILRUNOUT_PIN > -1
+    if(card.sdprinting) {
+      if(!(READ(FILRUNOUT_PIN))^FIL_RUNOUT_INVERTING)
+      filrunout();        }
+#endif
+
 #if defined(HOME_PIN) && HOME_PIN > -1
    static int homeDebounceCount = 0;   // poor man's debouncing count
    const int HOME_DEBOUNCE_DELAY = 10000;
   while(1) { /* Intentionally left empty */ } // Wait for reset
 }
 
+#ifdef FILAMENT_RUNOUT_SENSOR
+   void filrunout()
+   {
+      if filrunoutEnqued == false {
+         filrunoutEnqued = true;
+         enquecommand("M600");
+      }
+   }
+#endif
+
 void Stop()
 {
   disable_heater();

Marlin/pins_RAMPS_13.h

   #define FILWIDTH_PIN        5
 #endif
 
+#if defined(FILAMENT_RUNOUT_SENSOR)
+  // define digital pin 4 for the filament runout sensor. Use the RAMPS 1.4 digital input 4 on the servos connector
+  #define FILRUNOUT_PIN        4
+#endif
+
 #if MB(RAMPS_13_EFB) || MB(RAMPS_13_EFF)
   #define FAN_PIN            9 // (Sprinter config)
   #if MB(RAMPS_13_EFF)