Add filament runout sensor support.

Author: arunoda

Marlin/Configuration.h

@@ -824,9 +824,9 @@
  * For other boards you may need to define FIL_RUNOUT_PIN.
  * By default the firmware assumes HIGH = has filament, LOW = ran out
  */
-//#define FILAMENT_RUNOUT_SENSOR
+#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
-  #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
+  #define FIL_RUNOUT_INVERTING true // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 #endif
@@ -1164,11 +1164,11 @@
  *    P1  Raise the nozzle always to Z-park height.
  *    P2  Raise the nozzle by Z-park amount, limited to Z_MAX_POS.
  */
-//#define NOZZLE_PARK_FEATURE
+#define NOZZLE_PARK_FEATURE
 
 #if ENABLED(NOZZLE_PARK_FEATURE)
   // Specify a park position as { X, Y, Z }
-  #define NOZZLE_PARK_POINT { (X_MIN_POS + 10), (Y_MAX_POS - 10), 20 }
+  #define NOZZLE_PARK_POINT { 40, 20, 20 }
   #define NOZZLE_PARK_XY_FEEDRATE 100   // X and Y axes feedrate in mm/s (also used for delta printers Z axis)
   #define NOZZLE_PARK_Z_FEEDRATE 5      // Z axis feedrate in mm/s (not used for delta printers)
 #endif

Marlin/Configuration_adv.h

@@ -876,13 +876,13 @@
  * 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      // Initial retract feedrate in mm/s
   #define PAUSE_PARK_RETRACT_LENGTH 2         // Initial retract in mm
                                               // It is a short retract used immediately after print interrupt before move to filament exchange position
   #define FILAMENT_CHANGE_UNLOAD_FEEDRATE 10  // Unload filament feedrate in mm/s - filament unloading can be fast
-  #define FILAMENT_CHANGE_UNLOAD_LENGTH 100   // Unload filament length from hotend in mm
+  #define FILAMENT_CHANGE_UNLOAD_LENGTH 0   // Unload filament length from hotend in mm
                                               // Longer length for bowden printers to unload filament from whole bowden tube,
                                               // shorter length for printers without bowden to unload filament from extruder only,
                                               // 0 to disable unloading for manual unloading

Marlin/pins_RAMPS.h

@@ -252,7 +252,7 @@
 #endif
 
 // define digital pin 4 for the filament runout sensor. Use the RAMPS 1.4 digital input 4 on the servos connector
-#define FIL_RUNOUT_PIN      4
+#define FIL_RUNOUT_PIN      19
 
 #ifndef PS_ON_PIN
   #define PS_ON_PIN        12