Optional edit steps per unit

Marlin/Configuration.h

@@ -1231,11 +1231,16 @@
 
 /**
  * Default Axis Steps Per Unit (linear=steps/mm, rotational=steps/°)
- * Override with M92
+ * Override with M92 (when enabled below)
  *                                      X, Y, Z [, I [, J [, K...]]], E0 [, E1[, E2...]]
  */
 #define DEFAULT_AXIS_STEPS_PER_UNIT   { 80, 80, 400, 500 }
 
+/**
+ * Enable support for M92. Disable to save at least ~530 bytes of flash.
+ */
+#define EDITABLE_STEPS_PER_UNIT
+
 /**
  * Default Max Feed Rate (linear=mm/s, rotational=°/s)
  * Override with M203

Marlin/src/feature/encoder_i2c.cpp

@@ -422,22 +422,22 @@ void I2CPositionEncoder::calibrate_steps_mm(const uint8_t iter) {
     travelledDistance = mm_from_count(ABS(stopCount - startCount));
 
     SERIAL_ECHOLNPGM("Attempted travel: ", travelDistance, "mm");
-    SERIAL_ECHOLNPGM("   Actual travel:  ", travelledDistance, "mm");
+    SERIAL_ECHOLNPGM("   Actual travel: ", travelledDistance, "mm");
 
-    //Calculate new axis steps per unit
+    // Calculate new axis steps per unit
     old_steps_mm = planner.settings.axis_steps_per_mm[encoderAxis];
     new_steps_mm = (old_steps_mm * travelDistance) / travelledDistance;
 
     SERIAL_ECHOLNPGM("Old steps/mm: ", old_steps_mm);
     SERIAL_ECHOLNPGM("New steps/mm: ", new_steps_mm);
 
-    //Save new value
+    // Save new value
     planner.settings.axis_steps_per_mm[encoderAxis] = new_steps_mm;
 
     if (iter > 1) {
       total += new_steps_mm;
 
-      // swap start and end points so next loop runs from current position
+      // Swap start and end points so next loop runs from current position
       const float tempCoord = startCoord[encoderAxis];
       startCoord[encoderAxis] = endCoord[encoderAxis];
       endCoord[encoderAxis] = tempCoord;

Marlin/src/gcode/config/M92.cpp

@@ -20,6 +20,10 @@
  *
  */
 
+#include "../../inc/MarlinConfigPre.h"
+
+#if ENABLED(EDITABLE_STEPS_PER_UNIT)
+
 #include "../gcode.h"
 #include "../../module/planner.h"
 
@@ -37,6 +41,7 @@
  *   H<microsteps> - Specify micro-steps to use. Best guess if not supplied.
  *   L<linear>     - Desired layer height in current units. Nearest good heights are shown.
  */
+
 void GcodeSuite::M92() {
 
   const int8_t target_extruder = get_target_extruder_from_command();
@@ -127,3 +132,5 @@ void GcodeSuite::M92_report(const bool forReplay/*=true*/, const int8_t e/*=-1*/
     UNUSED(e);
   #endif
 }
+
+#endif // EDITABLE_STEPS_PER_UNIT

Marlin/src/gcode/gcode.cpp

@@ -669,7 +669,10 @@ void GcodeSuite::process_parsed_command(const bool no_ok/*=false*/) {
         case 87: M87(); break;                                    // M87: Cancel Hotend Idle Timeout
       #endif
 
-      case 92: M92(); break;                                      // M92: Set the steps-per-unit for one or more axes
+      #if ENABLED(EDITABLE_STEPS_PER_UNIT)
+        case 92: M92(); break;                                    // M92: Set the steps-per-unit for one or more axes
+      #endif
+
       case 114: M114(); break;                                    // M114: Report current position
 
       #if ENABLED(CAPABILITIES_REPORT)

Marlin/src/gcode/gcode.h

@@ -128,7 +128,7 @@
  * M84  - Disable steppers until next move, or use S<seconds> to specify an idle
  *        duration after which steppers should turn off. S0 disables the timeout.
  * M85  - Set inactivity shutdown timer with parameter S<seconds>. To disable set zero (default)
- * M92  - Set planner.settings.axis_steps_per_mm for one or more axes.
+ * M92  - Set planner.settings.axis_steps_per_mm for one or more axes. (Requires EDITABLE_STEPS_PER_UNIT)
  *
  * M100 - Watch Free Memory (for debugging) (Requires M100_FREE_MEMORY_WATCHER)
  *
@@ -719,8 +719,10 @@ class GcodeSuite {
     static void M87();
   #endif
 
-  static void M92();
-  static void M92_report(const bool forReplay=true, const int8_t e=-1);
+  #if ENABLED(EDITABLE_STEPS_PER_UNIT)
+    static void M92();
+    static void M92_report(const bool forReplay=true, const int8_t e=-1);
+  #endif
 
   #if ENABLED(M100_FREE_MEMORY_WATCHER)
     static void M100();

Marlin/src/inc/SanityCheck.h

@@ -458,6 +458,8 @@ static_assert(COUNT(arm) == LOGICAL_AXES, "AXIS_RELATIVE_MODES must contain " _L
 #if ENABLED(I2C_POSITION_ENCODERS)
   #if !ALL(BABYSTEPPING, BABYSTEP_XY)
     #error "I2C_POSITION_ENCODERS requires BABYSTEPPING and BABYSTEP_XY."
+  #elif DISABLED(EDITABLE_STEPS_PER_UNIT)
+    #error "EDITABLE_STEPS_PER_UNIT is required for I2C_POSITION_ENCODERS."
   #elif !WITHIN(I2CPE_ENCODER_CNT, 1, 5)
     #error "I2CPE_ENCODER_CNT must be between 1 and 5."
   #endif

Marlin/src/inc/Warnings.cpp

@@ -833,3 +833,10 @@
 #if ALL(FT_MOTION, I2S_STEPPER_STREAM)
   #warning "FT_MOTION has not been tested with I2S_STEPPER_STREAM."
 #endif
+
+/**
+ * User doesn't have or disabled G92?
+ */
+#if DISABLED(EDITABLE_STEPS_PER_UNIT)
+  #warning "EDITABLE_STEPS_PER_UNIT is required to enable G92 runtime configuration of steps-per-unit."
+#endif

Marlin/src/lcd/e3v2/creality/dwin.cpp

@@ -1619,23 +1619,27 @@ void hmiMaxAccelerationXYZE() {
 
 #endif // CLASSIC_JERK
 
-void hmiStepXYZE() {
-  EncoderState encoder_diffState = encoderReceiveAnalyze();
-  if (encoder_diffState == ENCODER_DIFF_NO) return;
-  if (applyEncoder(encoder_diffState, hmiValues.maxStepScaled)) {
-    checkkey = ID_Step;
-    encoderRate.enabled = false;
+#if ENABLED(EDITABLE_STEPS_PER_UNIT)
+
+  void hmiStepXYZE() {
+    EncoderState encoder_diffState = encoderReceiveAnalyze();
+    if (encoder_diffState == ENCODER_DIFF_NO) return;
+    if (applyEncoder(encoder_diffState, hmiValues.maxStepScaled)) {
+      checkkey = ID_Step;
+      encoderRate.enabled = false;
+      if (WITHIN(hmiFlag.step_axis, X_AXIS, LAST_AXIS))
+        planner.settings.axis_steps_per_mm[hmiFlag.step_axis] = hmiValues.maxStepScaled / MINUNITMULT;
+      drawEditFloat3(select_step.now, hmiValues.maxStepScaled);
+      return;
+    }
+    // Step limit
     if (WITHIN(hmiFlag.step_axis, X_AXIS, LAST_AXIS))
-      planner.settings.axis_steps_per_mm[hmiFlag.step_axis] = hmiValues.maxStepScaled / MINUNITMULT;
-    drawEditFloat3(select_step.now, hmiValues.maxStepScaled);
-    return;
+      LIMIT(hmiValues.maxStepScaled, min_steps_edit_values[hmiFlag.step_axis] * MINUNITMULT, max_steps_edit_values[hmiFlag.step_axis] * MINUNITMULT);
+    // Step value
+    drawEditFloat3(select_step.now, hmiValues.maxStepScaled, true);
   }
-  // Step limit
-  if (WITHIN(hmiFlag.step_axis, X_AXIS, LAST_AXIS))
-    LIMIT(hmiValues.maxStepScaled, min_steps_edit_values[hmiFlag.step_axis] * MINUNITMULT, max_steps_edit_values[hmiFlag.step_axis] * MINUNITMULT);
-  // Step value
-  drawEditFloat3(select_step.now, hmiValues.maxStepScaled, true);
-}
+
+#endif // EDITABLE_STEPS_PER_UNIT
 
 // Draw X, Y, Z and blink if in an un-homed or un-trusted state
 void _update_axis_value(const AxisEnum axis, const uint16_t x, const uint16_t y, const bool blink, const bool force) {
@@ -4279,7 +4283,9 @@ void dwinHandleScreen() {
     #if ENABLED(CLASSIC_JERK)
       case ID_MaxJerkValue: hmiMaxJerkXYZE(); break;
     #endif
-    case ID_StepValue:      hmiStepXYZE(); break;
+    #if ENABLED(EDITABLE_STEPS_PER_UNIT)
+      case ID_StepValue:    hmiStepXYZE(); break;
+    #endif
     default: break;
   }
 }

Marlin/src/lcd/e3v2/creality/dwin.h

@@ -204,7 +204,10 @@ void hmiPrintSpeed();
 void hmiMaxFeedspeedXYZE();
 void hmiMaxAccelerationXYZE();
 void hmiMaxJerkXYZE();
-void hmiStepXYZE();
+#if ENABLED(EDITABLE_STEPS_PER_UNIT)
+  void hmiStepXYZE();
+#endif
+
 void hmiSetLanguageCache();
 
 void updateVariable();

Marlin/src/lcd/e3v2/jyersui/dwin.cpp

@@ -2364,6 +2364,7 @@ void JyersDWIN::menuItemHandler(const uint8_t menu, const uint8_t item, bool dra
           else
             drawMenu(ID_MaxAcceleration);
           break;
+
         #if ENABLED(CLASSIC_JERK)
           case MOTION_JERK:
             if (draw)
@@ -2372,12 +2373,16 @@ void JyersDWIN::menuItemHandler(const uint8_t menu, const uint8_t item, bool dra
               drawMenu(ID_MaxJerk);
             break;
         #endif
-        case MOTION_STEPS:
-          if (draw)
-            drawMenuItem(row, ICON_Step, GET_TEXT_F(MSG_STEPS_PER_MM), nullptr, true);
-          else
-            drawMenu(ID_Steps);
-          break;
+
+        #if ENABLED(EDITABLE_STEPS_PER_UNIT)
+          case MOTION_STEPS:
+            if (draw)
+              drawMenuItem(row, ICON_Step, GET_TEXT_F(MSG_STEPS_PER_MM), nullptr, true);
+            else
+              drawMenu(ID_Steps);
+            break;
+        #endif
+
         #if HAS_HOTEND
           case MOTION_FLOW:
             if (draw) {
@@ -2388,6 +2393,7 @@ void JyersDWIN::menuItemHandler(const uint8_t menu, const uint8_t item, bool dra
               modifyValue(planner.flow_percentage[0], MIN_FLOW_RATE, MAX_FLOW_RATE, 1, []{ planner.refresh_e_factor(0); });
             break;
         #endif
+
         #if ENABLED(LIN_ADVANCE)
           case MOTION_LA:
             if (draw) {
@@ -2613,64 +2619,69 @@ void JyersDWIN::menuItemHandler(const uint8_t menu, const uint8_t item, bool dra
         }
         break;
     #endif
-    case ID_Steps:
 
-      #define STEPS_BACK 0
-      #define STEPS_X (STEPS_BACK + ENABLED(HAS_X_AXIS))
-      #define STEPS_Y (STEPS_X + ENABLED(HAS_Y_AXIS))
-      #define STEPS_Z (STEPS_Y + ENABLED(HAS_Z_AXIS))
-      #define STEPS_E (STEPS_Z + ENABLED(HAS_HOTEND))
-      #define STEPS_TOTAL STEPS_E
+    #if ENABLED(EDITABLE_STEPS_PER_UNIT)
 
-      switch (item) {
-        case STEPS_BACK:
-          if (draw)
-            drawMenuItem(row, ICON_Back, GET_TEXT_F(MSG_BACK));
-          else
-            drawMenu(ID_Motion, MOTION_STEPS);
-          break;
-        #if HAS_X_AXIS
-          case STEPS_X:
-            if (draw) {
-              drawMenuItem(row, ICON_StepX, GET_TEXT_F(MSG_A_STEPS));
-              drawFloat(planner.settings.axis_steps_per_mm[X_AXIS], row, false, STEPS_UNIT);
-            }
-            else
-              modifyValue(planner.settings.axis_steps_per_mm[X_AXIS], min_steps_edit_values.x, max_steps_edit_values.x, STEPS_UNIT);
-            break;
-        #endif
-        #if HAS_Y_AXIS
-          case STEPS_Y:
-            if (draw) {
-              drawMenuItem(row, ICON_StepY, GET_TEXT_F(MSG_B_STEPS));
-              drawFloat(planner.settings.axis_steps_per_mm[Y_AXIS], row, false, STEPS_UNIT);
-            }
-            else
-              modifyValue(planner.settings.axis_steps_per_mm[Y_AXIS], min_steps_edit_values.y, max_steps_edit_values.y, STEPS_UNIT);
-            break;
-        #endif
-        #if HAS_Z_AXIS
-          case STEPS_Z:
-            if (draw) {
-              drawMenuItem(row, ICON_StepZ, GET_TEXT_F(MSG_C_STEPS));
-              drawFloat(planner.settings.axis_steps_per_mm[Z_AXIS], row, false, STEPS_UNIT);
-            }
-            else
-              modifyValue(planner.settings.axis_steps_per_mm[Z_AXIS], min_steps_edit_values.z, max_steps_edit_values.z, STEPS_UNIT);
-            break;
-        #endif
-        #if HAS_HOTEND
-          case STEPS_E:
-            if (draw) {
-              drawMenuItem(row, ICON_StepE, GET_TEXT_F(MSG_E_STEPS));
-              drawFloat(planner.settings.axis_steps_per_mm[E_AXIS], row, false, STEPS_UNIT);
-            }
+      case ID_Steps:
+
+        #define STEPS_BACK 0
+        #define STEPS_X (STEPS_BACK + ENABLED(HAS_X_AXIS))
+        #define STEPS_Y (STEPS_X + ENABLED(HAS_Y_AXIS))
+        #define STEPS_Z (STEPS_Y + ENABLED(HAS_Z_AXIS))
+        #define STEPS_E (STEPS_Z + ENABLED(HAS_HOTEND))
+        #define STEPS_TOTAL STEPS_E
+
+        switch (item) {
+          case STEPS_BACK:
+            if (draw)
+              drawMenuItem(row, ICON_Back, GET_TEXT_F(MSG_BACK));
             else
-              modifyValue(planner.settings.axis_steps_per_mm[E_AXIS], min_steps_edit_values.e, max_steps_edit_values.e, STEPS_UNIT);
+              drawMenu(ID_Motion, MOTION_STEPS);
             break;
-        #endif
-      }
-      break;
+          #if HAS_X_AXIS
+            case STEPS_X:
+              if (draw) {
+                drawMenuItem(row, ICON_StepX, GET_TEXT_F(MSG_A_STEPS));
+                drawFloat(planner.settings.axis_steps_per_mm[X_AXIS], row, false, STEPS_UNIT);
+              }
+              else
+                modifyValue(planner.settings.axis_steps_per_mm[X_AXIS], min_steps_edit_values.x, max_steps_edit_values.x, STEPS_UNIT);
+              break;
+          #endif
+          #if HAS_Y_AXIS
+            case STEPS_Y:
+              if (draw) {
+                drawMenuItem(row, ICON_StepY, GET_TEXT_F(MSG_B_STEPS));
+                drawFloat(planner.settings.axis_steps_per_mm[Y_AXIS], row, false, STEPS_UNIT);
+              }
+              else
+                modifyValue(planner.settings.axis_steps_per_mm[Y_AXIS], min_steps_edit_values.y, max_steps_edit_values.y, STEPS_UNIT);
+              break;
+          #endif
+          #if HAS_Z_AXIS
+            case STEPS_Z:
+              if (draw) {
+                drawMenuItem(row, ICON_StepZ, GET_TEXT_F(MSG_C_STEPS));
+                drawFloat(planner.settings.axis_steps_per_mm[Z_AXIS], row, false, STEPS_UNIT);
+              }
+              else
+                modifyValue(planner.settings.axis_steps_per_mm[Z_AXIS], min_steps_edit_values.z, max_steps_edit_values.z, STEPS_UNIT);
+              break;
+          #endif
+          #if HAS_HOTEND
+            case STEPS_E:
+              if (draw) {
+                drawMenuItem(row, ICON_StepE, GET_TEXT_F(MSG_E_STEPS));
+                drawFloat(planner.settings.axis_steps_per_mm[E_AXIS], row, false, STEPS_UNIT);
+              }
+              else
+                modifyValue(planner.settings.axis_steps_per_mm[E_AXIS], min_steps_edit_values.e, max_steps_edit_values.e, STEPS_UNIT);
+              break;
+          #endif
+        }
+        break;
+
+    #endif // EDITABLE_STEPS_PER_UNIT
 
     case ID_Visual:
 
@@ -4173,7 +4184,9 @@ FSTR_P JyersDWIN::getMenuTitle(const uint8_t menu) {
     #if ENABLED(CLASSIC_JERK)
       case ID_MaxJerk:      return F("Max Jerk");
     #endif
-    case ID_Steps:          return GET_TEXT_F(MSG_STEPS_PER_MM);
+    #if ENABLED(EDITABLE_STEPS_PER_UNIT)
+      case ID_Steps:        return GET_TEXT_F(MSG_STEPS_PER_MM);
+    #endif
     case ID_Visual:         return F("Visual Settings");
     case ID_Advanced:       return GET_TEXT_F(MSG_ADVANCED_SETTINGS);
     #if HAS_BED_PROBE
@@ -4250,7 +4263,9 @@ uint8_t JyersDWIN::getMenuSize(const uint8_t menu) {
     #if ENABLED(CLASSIC_JERK)
       case ID_MaxJerk:      return JERK_TOTAL;
     #endif
-    case ID_Steps:          return STEPS_TOTAL;
+    #if ENABLED(EDITABLE_STEPS_PER_UNIT)
+      case ID_Steps:        return STEPS_TOTAL;
+    #endif
     case ID_Visual:         return VISUAL_TOTAL;
     case ID_Advanced:       return ADVANCED_TOTAL;
     #if HAS_BED_PROBE

Marlin/src/lcd/e3v2/jyersui/dwin.h

@@ -101,7 +101,7 @@ enum menuID : uint8_t {
         ID_MaxSpeed,
         ID_MaxAcceleration,
         ID_MaxJerk,
-        ID_Steps,
+        OPTITEM(EDITABLE_STEPS_PER_UNIT, ID_Steps)
       ID_Visual,
         ID_ColorSettings,
       ID_Advanced,