Various Laser / Spindle improvements (#15335)

Marlin/src/gcode/control/M3-M5.cpp

@@ -28,6 +28,12 @@
 #include "../../feature/spindle_laser.h"
 #include "../../module/stepper.h"
 
+inline cutter_power_t get_s_power() {
+  return cutter_power_t(
+    parser.intval('S', cutter.interpret_power(SPEED_POWER_STARTUP))
+  );
+}
+
 /**
  * Laser:
  *
@@ -71,29 +77,52 @@
  */
 void GcodeSuite::M3_M4(const bool is_M4) {
 
-  #if ENABLED(SPINDLE_FEATURE)
-    planner.synchronize();   // Wait for movement to complete before changing power
+  #if ENABLED(LASER_POWER_INLINE)
+    if (parser.seen('I') == DISABLED(LASER_POWER_INLINE_INVERT)) {
+      // Laser power in inline mode
+      cutter.inline_direction(is_M4); // Should always be unused
+
+      #if ENABLED(SPINDLE_LASER_PWM)
+        if (parser.seen('O'))
+          cutter.inline_ocr_power(parser.value_byte()); // The OCR is a value from 0 to 255 (uint8_t)
+        else
+          cutter.inline_power(get_s_power());
+      #else
+        cutter.inline_enabled(true);
+      #endif
+      return;
+    }
+    // Non-inline, standard case
+    cutter.inline_disable(); // Prevent future blocks re-setting the power
   #endif
 
+  planner.synchronize();   // Wait for previous movement commands (G0/G0/G2/G3) to complete before changing power
+
   cutter.set_direction(is_M4);
 
   #if ENABLED(SPINDLE_LASER_PWM)
     if (parser.seenval('O'))
       cutter.set_ocr_power(parser.value_byte()); // The OCR is a value from 0 to 255 (uint8_t)
     else
-      cutter.set_power(parser.intval('S', 255));
+      cutter.set_power(get_s_power());
   #else
     cutter.set_enabled(true);
   #endif
 }
 
 /**
- * M5 - Cutter OFF
+ * M5 - Cutter OFF (when moves are complete)
  */
 void GcodeSuite::M5() {
-  #if ENABLED(SPINDLE_FEATURE)
-    planner.synchronize();
+  #if ENABLED(LASER_POWER_INLINE)
+    if (parser.seen('I') == DISABLED(LASER_POWER_INLINE_INVERT)) {
+      cutter.inline_enabled(false); // Laser power in inline mode
+      return;
+    }
+    // Non-inline, standard case
+    cutter.inline_disable(); // Prevent future blocks re-setting the power
   #endif
+  planner.synchronize();
   cutter.set_enabled(false);
 }