// ###  insdie gcode.cpp gcode.h also have addtional info for M1910
void GcodeSuite::M1910() {
  float saved_z = current_position.z;       
  //float real_z = planner.get_axis_position_mm(Z_AXIS); 
  edm_mode=true;    			// set flag when 1st used 
  SERIAL_ECHO(" before synchro: ");	// debug
  SERIAL_ECHO(millis());			// debug
  planner.synchronize();  			// Stop movment
  SERIAL_ECHO(" after synchro: ");		//debug
  SERIAL_ECHO(millis());			//debug
  current_position.z -= 0.35;			// move bit back
  line_to_current_position();			// alig axis
   current_position.z += 0.35;		// move to start position
  line_to_current_position();			// align axis
  SERIAL_ECHO(" after all ");		//debug
  SERIAL_ECHO(millis());			// debug
}

// ## MarlinCore.cpp
// ## this is called at idle loop
void edm_trigger_update() {
if(edm_mode==true){
	static bool edm_triggered_last = false;  // this is to handle only one change from Hi to Low state
	bool edm_triggered_now = (digitalRead(EDM_TRIGGER_PIN) == LOW);  // this is to handle only one change from Hi to Low state
		if (edm_triggered_now && !edm_triggered_last) {
			SERIAL_ECHO("Loop enters: "); 	// debug
 			SERIAL_ECHO(millis());		// debug
			queue.enqueue_one("M410");	// let’s stop current movment
			SERIAL_ECHO(" enqueue_one M410 at: "); // debug
			SERIAL_ECHO( millis());			// debug
			  queue.enqueue_one("M1910");	// lets call bit back bit FWD
			  //SERIAL_ECHO(" enqueue_one M1910 at: "); // debug
			SERIAL_ECHO(millis());		// debug
					}
 	edm_triggered_last = edm_triggered_now; // this is to handle only one change from Hi to Low state
 }
}