G92, subcodes flag cleanup

Marlin/src/gcode/geometry/G92.cpp

@@ -29,77 +29,90 @@
 #endif
 
 /**
- * G92: Set current position to given X Y Z E
+ * G92: Set the Current Position to the given X Y Z E values.
+ *
+ * Behind the scenes the G92 command may modify the Current Position
+ * or the Position Shift depending on settings and sub-commands.
+ *
+ * Since E has no Workspace Offset, it is always set directly.
+ *
+ * Without Workspace Offsets (e.g., with NO_WORKSPACE_OFFSETS):
+ *   G92   : Set NATIVE Current Position to the given X Y Z E.
+ *
+ * Using Workspace Offsets (default Marlin behavior):
+ *   G92   : Modify Workspace Offsets so the reported position shows the given X Y Z E.
+ *   G92.1 : Zero XYZ Workspace Offsets (so the reported position = the native position).
+ *
+ * With POWER_LOSS_RECOVERY:
+ *   G92.9 : Set NATIVE Current Position to the given X Y Z E.
  */
 void GcodeSuite::G92() {
 
-  bool sync_E = false, sync_XYZ = false;
+  bool sync_E = false, sync_XYZE = false;
 
-  #if ENABLED(USE_GCODE_SUBCODES)
+  #if USE_GCODE_SUBCODES
     const uint8_t subcode_G92 = parser.subcode;
   #else
     constexpr uint8_t subcode_G92 = 0;
   #endif
 
   switch (subcode_G92) {
-    default: break;
-    #if ENABLED(CNC_COORDINATE_SYSTEMS)
-      case 1: {
-        // Zero the G92 values and restore current position
-        #if !IS_SCARA
-          LOOP_XYZ(i) if (position_shift[i]) {
-            position_shift[i] = 0;
-            update_workspace_offset((AxisEnum)i);
-          }
-        #endif // Not SCARA
-      } return;
+    default: return;                                                  // Ignore unknown G92.x
+
+    #if ENABLED(CNC_COORDINATE_SYSTEMS) && !IS_SCARA
+      case 1:                                                         // G92.1 - Zero the Workspace Offset
+        LOOP_XYZ(i) if (position_shift[i]) {
+          position_shift[i] = 0;
+          update_workspace_offset((AxisEnum)i);
+        }
+        break;
     #endif
+
     #if ENABLED(POWER_LOSS_RECOVERY)
-      case 9: {
+      case 9:                                                         // G92.9 - Set Current Position directly (like Marlin 1.0)
         LOOP_XYZE(i) {
           if (parser.seenval(axis_codes[i])) {
+            if (i == E_AXIS) sync_E = true; else sync_XYZE = true;
             current_position[i] = parser.value_axis_units((AxisEnum)i);
-            if (i == E_AXIS) sync_E = true; else sync_XYZ = true;
           }
         }
-      } break;
+        break;
     #endif
-    case 0: {
+
+    case 0:
       LOOP_XYZE(i) {
         if (parser.seenval(axis_codes[i])) {
-          const float l = parser.value_axis_units((AxisEnum)i),
-                      v = i == E_AXIS ? l : LOGICAL_TO_NATIVE(l, i),
-                      d = v - current_position[i];
+          const float l = parser.value_axis_units((AxisEnum)i),       // Given axis coordinate value, converted to millimeters
+                      v = i == E_AXIS ? l : LOGICAL_TO_NATIVE(l, i),  // Axis position in NATIVE space (applying the existing offset)
+                      d = v - current_position[i];                    // How much is the current axis position altered by?
           if (!NEAR_ZERO(d)) {
-            #if IS_SCARA || !HAS_POSITION_SHIFT
-              if (i == E_AXIS) sync_E = true; else sync_XYZ = true;
-              current_position[i] = v;        // Without workspaces revert to Marlin 1.0 behavior
-            #elif HAS_POSITION_SHIFT
+            #if HAS_POSITION_SHIFT && !IS_SCARA                       // When using workspaces...
               if (i == E_AXIS) {
                 sync_E = true;
-                current_position.e = v;       // When using coordinate spaces, only E is set directly
+                current_position.e = v;                               // ...E is still set directly
               }
               else {
-                position_shift[i] += d;       // Other axes simply offset the coordinate space
+                position_shift[i] += d;                               // ...but other axes offset the workspace.
                 update_workspace_offset((AxisEnum)i);
               }
+            #else                                                     // Without workspaces...
+              if (i == E_AXIS) sync_E = true; else sync_XYZE = true;
+              current_position[i] = v;                                // ...set Current Position directly (like Marlin 1.0)
             #endif
           }
         }
       }
-    } break;
+      break;
   }
 
   #if ENABLED(CNC_COORDINATE_SYSTEMS)
-    // Apply workspace offset to the active coordinate system
+    // Apply Workspace Offset to the active coordinate system
     if (WITHIN(active_coordinate_system, 0, MAX_COORDINATE_SYSTEMS - 1))
       coordinate_system[active_coordinate_system] = position_shift;
   #endif
 
-  if    (sync_XYZ) sync_plan_position();
+  if   (sync_XYZE) sync_plan_position();
   else if (sync_E) sync_plan_position_e();
 
-  #if DISABLED(DIRECT_STEPPING)
-    report_current_position();
-  #endif
+  IF_DISABLED(DIRECT_STEPPING, report_current_position());
 }

Marlin/src/gcode/parser.cpp

@@ -47,13 +47,13 @@ char *GCodeParser::command_ptr,
 char GCodeParser::command_letter;
 uint16_t GCodeParser::codenum;
 
-#if ENABLED(USE_GCODE_SUBCODES)
+#if USE_GCODE_SUBCODES
   uint8_t GCodeParser::subcode;
 #endif
 
 #if ENABLED(GCODE_MOTION_MODES)
   int16_t GCodeParser::motion_mode_codenum = -1;
-  #if ENABLED(USE_GCODE_SUBCODES)
+  #if USE_GCODE_SUBCODES
     uint8_t GCodeParser::motion_mode_subcode;
   #endif
 #endif
@@ -189,7 +189,7 @@ void GCodeParser::parse(char *p) {
       }
 
       // Allow for decimal point in command
-      #if ENABLED(USE_GCODE_SUBCODES)
+      #if USE_GCODE_SUBCODES
         if (*p == '.') {
           p++;
           while (NUMERIC(*p))

Marlin/src/gcode/parser.h

@@ -85,13 +85,13 @@ public:
               *string_arg,                // string of command line
               command_letter;             // G, M, or T
   static uint16_t codenum;                // 123
-  #if ENABLED(USE_GCODE_SUBCODES)
+  #if USE_GCODE_SUBCODES
     static uint8_t subcode;               // .1
   #endif
 
   #if ENABLED(GCODE_MOTION_MODES)
     static int16_t motion_mode_codenum;
-    #if ENABLED(USE_GCODE_SUBCODES)
+    #if USE_GCODE_SUBCODES
       static uint8_t motion_mode_subcode;
     #endif
     FORCE_INLINE static void cancel_motion_mode() { motion_mode_codenum = -1; }

Marlin/src/inc/Conditionals_post.h

@@ -2758,7 +2758,7 @@
 
 // Add commands that need sub-codes to this list
 #if ANY(G38_PROBE_TARGET, CNC_COORDINATE_SYSTEMS, POWER_LOSS_RECOVERY)
-  #define USE_GCODE_SUBCODES
+  #define USE_GCODE_SUBCODES 1
 #endif
 
 // Parking Extruder