Laser Cutter Air Assist (#21753)

Marlin/Configuration_adv.h

   //#define AIR_EVACUATION                     // Cutter Vacuum / Laser Blower motor control with G-codes M10-M11
   #if ENABLED(AIR_EVACUATION)
     #define AIR_EVACUATION_ACTIVE       LOW    // Set to "HIGH" if the on/off function is active HIGH
-    #define AIR_EVACUATION_PIN          42     // Override the default Cutter Vacuum or Laser Blower pin
+    //#define AIR_EVACUATION_PIN        42     // Override the default Cutter Vacuum or Laser Blower pin
   #endif
 
-  //#define SPINDLE_SERVO         // A servo converting an angle to spindle power
+  //#define AIR_ASSIST                         // Air Assist control with G-codes M8-M9
+  #if ENABLED(AIR_ASSIST)
+    #define AIR_ASSIST_ACTIVE           LOW    // Active state on air assist pin
+    //#define AIR_ASSIST_PIN            44     // Override the default Air Assist pin
+  #endif
+
+  //#define SPINDLE_SERVO                      // A servo converting an angle to spindle power
   #ifdef SPINDLE_SERVO
-    #define SPINDLE_SERVO_NR   0  // Index of servo used for spindle control
-    #define SPINDLE_SERVO_MIN 10  // Minimum angle for servo spindle
+    #define SPINDLE_SERVO_NR   0               // Index of servo used for spindle control
+    #define SPINDLE_SERVO_MIN 10               // Minimum angle for servo spindle
   #endif
 
   /**

Marlin/src/feature/spindle_laser.cpp

   #if ENABLED(AIR_EVACUATION)
     OUT_WRITE(AIR_EVACUATION_PIN, !AIR_EVACUATION_ACTIVE);            // Init Vacuum/Blower OFF
   #endif
+  #if ENABLED(AIR_ASSIST)
+    OUT_WRITE(AIR_ASSIST_PIN, !AIR_ASSIST_ACTIVE);                    // Init Air Assist OFF
+  #endif
 }
 
 #if ENABLED(SPINDLE_LASER_PWM)
 
   void SpindleLaser::air_evac_toggle()  { TOGGLE(AIR_EVACUATION_PIN); } // Toggle state
 
-#endif
+#endif // AIR_EVACUATION
+
+#if ENABLED(AIR_ASSIST)
+
+  // Enable / disable air assist
+  void SpindleLaser::air_assist_enable()  { WRITE(AIR_ASSIST_PIN,  AIR_ASSIST_PIN); } // Turn ON
+
+  void SpindleLaser::air_assist_disable() { WRITE(AIR_ASSIST_PIN, !AIR_ASSIST_PIN); } // Turn OFF
+
+  void SpindleLaser::air_assist_toggle()  { TOGGLE(AIR_ASSIST_PIN); } // Toggle state
+
+#endif // AIR_ASSIST
 
 #endif // HAS_CUTTER

Marlin/src/feature/spindle_laser.h

     }
   #endif
 
+  #if ENABLED(AIR_ASSIST)
+    static void air_assist_enable();         // Turn on air assist
+    static void air_assist_disable();        // Turn off air assist
+    static void air_assist_toggle();         // Toggle air assist
+    static inline bool air_assist_state() {  // Get current state
+      return (READ(AIR_ASSIST_PIN) == AIR_ASSIST_ACTIVE);
+    }
+  #endif
+
   static inline void disable() { isReady = false; set_enabled(false); }
 
   #if HAS_LCD_MENU

Marlin/src/gcode/control/M10-M11.cpp

 #if ENABLED(AIR_EVACUATION)
 
 #include "../gcode.h"
-#include "../../module/planner.h"
 #include "../../feature/spindle_laser.h"
 
 /**
  * M10: Vacuum or Blower On
  */
 void GcodeSuite::M10() {
-  planner.synchronize();      // Wait for move to arrive (TODO: asynchronous)
   cutter.air_evac_enable();   // Turn on Vacuum or Blower motor
 }
 
  * M11: Vacuum or Blower OFF
  */
 void GcodeSuite::M11() {
-  planner.synchronize();      // Wait for move to arrive (TODO: asynchronous)
   cutter.air_evac_disable();  // Turn off Vacuum or Blower motor
 }
 

Marlin/src/gcode/control/M7-M9.cpp

 }
 
 #endif // COOLANT_CONTROL
+
+#if ENABLED(AIR_ASSIST)
+
+#include "../gcode.h"
+#include "../../module/planner.h"
+#include "../../feature/spindle_laser.h"
+
+/**
+ * M8: Air Assist On
+ */
+void GcodeSuite::M8() {
+  planner.synchronize(); 
+  cutter.air_assist_enable();   // Turn on Air Assist pin
+}
+
+/**
+ * M9: Air Assist Off
+ */
+void GcodeSuite::M9() {
+  planner.synchronize(); 
+  cutter.air_assist_disable();  // Turn off Air Assist pin
+}
+
+#endif // AIR_ASSIST

Marlin/src/lcd/language/language_en.h

   PROGMEM Language_Str MSG_SPINDLE_POWER                   = _UxGT("Spindle Pwr");
   PROGMEM Language_Str MSG_LASER_TOGGLE                    = _UxGT("Toggle Laser");
   PROGMEM Language_Str MSG_LASER_EVAC_TOGGLE               = _UxGT("Toggle Blower");
+  PROGMEM Language_Str MSG_LASER_ASSIST_TOGGLE             = _UxGT("Air Assist");
   PROGMEM Language_Str MSG_LASER_PULSE_MS                  = _UxGT("Test Pulse ms");
   PROGMEM Language_Str MSG_LASER_FIRE_PULSE                = _UxGT("Fire Pulse");
   PROGMEM Language_Str MSG_FLOWMETER_FAULT                 = _UxGT("Coolant Flow Fault");

Marlin/src/lcd/menu/menu_spindle_laser.cpp

       EDIT_ITEM(bool, MSG_CUTTER(EVAC_TOGGLE), &evac_state, cutter.air_evac_toggle);
     #endif
 
+    #if ENABLED(AIR_ASSIST)
+      bool air_assist_state = cutter.air_assist_state();
+      EDIT_ITEM(bool, MSG_CUTTER(ASSIST_TOGGLE), &air_assist_state, cutter.air_assist_toggle);
+    #endif
+
     #if ENABLED(SPINDLE_CHANGE_DIR)
       if (!is_enabled) {
         editable.state = is_rev;

buildroot/tests/mega2560

 restore_configs
 opt_set MOTHERBOARD BOARD_RAMPS_14_EFB LCD_LANGUAGE en TEMP_SENSOR_COOLER 1 EXTRUDERS 0 TEMP_SENSOR_1 0 SERIAL_PORT_2 2
 opt_enable REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER SDSUPPORT EEPROM_SETTINGS EEPROM_BOOT_SILENT EEPROM_AUTO_INIT \
-           LASER_FEATURE LASER_COOLANT_FLOW_METER MEATPACK_ON_SERIAL_PORT_1
+           LASER_FEATURE AIR_EVACUATION AIR_ASSIST LASER_COOLANT_FLOW_METER MEATPACK_ON_SERIAL_PORT_1
 
-exec_test $1 $2 "REPRAP MEGA2560 RAMPS | Laser Feature | Cooler | Flowmeter | 12864 LCD | meatpack | SERIAL_PORT_2 " "$3"
+exec_test $1 $2 "REPRAP MEGA2560 RAMPS | Laser Feature | Air Evacuation | Air Assist | Cooler | Flowmeter | 12864 LCD | meatpack | SERIAL_PORT_2 " "$3"
 
 #
 # Test Laser features with 44780 LCD
 restore_configs
 opt_set MOTHERBOARD BOARD_RAMPS_14_EFB LCD_LANGUAGE en TEMP_SENSOR_COOLER 1 EXTRUDERS 0 TEMP_SENSOR_1 0
 opt_enable REPRAP_DISCOUNT_SMART_CONTROLLER SDSUPPORT EEPROM_SETTINGS EEPROM_BOOT_SILENT EEPROM_AUTO_INIT \
-           LASER_FEATURE LASER_COOLANT_FLOW_METER
+           LASER_FEATURE AIR_EVACUATION AIR_ASSIST LASER_COOLANT_FLOW_METER
 
-exec_test $1 $2 "REPRAP MEGA2560 RAMPS | Laser Feature | Cooler | Flowmeter | 44780 LCD " "$3"
+exec_test $1 $2 "REPRAP MEGA2560 RAMPS | Laser Feature | Air Evacuation | Air Assist | Cooler | Flowmeter | 44780 LCD " "$3"
 
 #
 # Language files test with REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER