Millimeters per step

Marlin/src/feature/encoder_i2c.cpp

@@ -173,7 +173,7 @@ void I2CPositionEncoder::update() {
             LOOP_L_N(i, I2CPE_ERR_PRST_ARRAY_SIZE) sumP += errPrst[i];
             const int32_t errorP = int32_t(sumP * RECIPROCAL(I2CPE_ERR_PRST_ARRAY_SIZE));
             SERIAL_CHAR(axis_codes[encoderAxis]);
-            SERIAL_ECHOLNPGM(" : CORRECT ERR ", errorP * planner.steps_to_mm[encoderAxis], "mm");
+            SERIAL_ECHOLNPGM(" : CORRECT ERR ", errorP * planner.mm_per_step[encoderAxis], "mm");
             babystep.add_steps(encoderAxis, -LROUND(errorP));
             errPrstIdx = 0;
           }

Marlin/src/feature/runout.h

@@ -373,7 +373,7 @@ class FilamentSensorBase {
           // Only trigger on extrusion with XYZ movement to allow filament change and retract/recover.
           const uint8_t e = b->extruder;
           const int32_t steps = b->steps.e;
-          runout_mm_countdown[e] -= (TEST(b->direction_bits, E_AXIS) ? -steps : steps) * planner.steps_to_mm[E_AXIS_N(e)];
+          runout_mm_countdown[e] -= (TEST(b->direction_bits, E_AXIS) ? -steps : steps) * planner.mm_per_step[E_AXIS_N(e)];
         }
       }
   };

Marlin/src/gcode/config/M92.cpp

@@ -76,7 +76,7 @@ void GcodeSuite::M92() {
     if (parser.seen('H') || wanted) {
       const uint16_t argH = parser.ushortval('H'),
                      micro_steps = argH ?: Z_MICROSTEPS;
-      const float z_full_step_mm = micro_steps * planner.steps_to_mm[Z_AXIS];
+      const float z_full_step_mm = micro_steps * planner.mm_per_step[Z_AXIS];
       SERIAL_ECHO_START();
       SERIAL_ECHOPGM("{ micro_steps:", micro_steps, ", z_full_step_mm:", z_full_step_mm);
       if (wanted) {

Marlin/src/lcd/extui/ui_api.cpp

@@ -755,7 +755,7 @@ namespace ExtUI {
      * what nozzle is printing.
      */
     void smartAdjustAxis_steps(const int16_t steps, const axis_t axis, bool linked_nozzles) {
-      const float mm = steps * planner.steps_to_mm[axis];
+      const float mm = steps * planner.mm_per_step[axis];
       UNUSED(mm);
 
       if (!babystepAxis_steps(steps, axis)) return;
@@ -791,12 +791,12 @@ namespace ExtUI {
      * steps that is at least mm long.
      */
     int16_t mmToWholeSteps(const_float_t mm, const axis_t axis) {
-      const float steps = mm / planner.steps_to_mm[axis];
+      const float steps = mm / planner.mm_per_step[axis];
       return steps > 0 ? CEIL(steps) : FLOOR(steps);
     }
 
     float mmFromWholeSteps(int16_t steps, const axis_t axis) {
-      return steps * planner.steps_to_mm[axis];
+      return steps * planner.mm_per_step[axis];
     }
 
   #endif // BABYSTEPPING
@@ -806,7 +806,7 @@ namespace ExtUI {
       #if HAS_BED_PROBE
         + probe.offset.z
       #elif ENABLED(BABYSTEP_DISPLAY_TOTAL)
-        + planner.steps_to_mm[Z_AXIS] * babystep.axis_total[BS_AXIS_IND(Z_AXIS)]
+        + planner.mm_per_step[Z_AXIS] * babystep.axis_total[BS_AXIS_IND(Z_AXIS)]
       #endif
     );
   }

Marlin/src/lcd/menu/menu.cpp

@@ -315,7 +315,7 @@ void scroll_screen(const uint8_t limit, const bool is_menu) {
       const int16_t babystep_increment = int16_t(ui.encoderPosition) * (BABYSTEP_SIZE_Z);
       ui.encoderPosition = 0;
 
-      const float diff = planner.steps_to_mm[Z_AXIS] * babystep_increment,
+      const float diff = planner.mm_per_step[Z_AXIS] * babystep_increment,
                   new_probe_offset = probe.offset.z + diff,
                   new_offs = TERN(BABYSTEP_HOTEND_Z_OFFSET
                     , do_probe ? new_probe_offset : hotend_offset[active_extruder].z - diff

Marlin/src/lcd/menu/menu_advanced.cpp

@@ -532,7 +532,7 @@ void menu_advanced_steps_per_mm() {
         if (e == active_extruder)
           planner.refresh_positioning();
         else
-          planner.steps_to_mm[E_AXIS_N(e)] = 1.0f / planner.settings.axis_steps_per_mm[E_AXIS_N(e)];
+          planner.mm_per_step[E_AXIS_N(e)] = 1.0f / planner.settings.axis_steps_per_mm[E_AXIS_N(e)];
       });
   #elif E_STEPPERS
     EDIT_ITEM_FAST(float51, MSG_E_STEPS, &planner.settings.axis_steps_per_mm[E_AXIS], 5, 9999, []{ planner.refresh_positioning(); });

Marlin/src/lcd/menu/menu_tune.cpp

@@ -65,8 +65,8 @@
       babystep.add_steps(axis, steps);
     }
     if (ui.should_draw()) {
-      const float spm = planner.steps_to_mm[axis];
-      MenuEditItemBase::draw_edit_screen(msg, BABYSTEP_TO_STR(spm * babystep.accum));
+      const float mps = planner.mm_per_step[axis];
+      MenuEditItemBase::draw_edit_screen(msg, BABYSTEP_TO_STR(mps * babystep.accum));
       #if ENABLED(BABYSTEP_DISPLAY_TOTAL)
         const bool in_view = TERN1(HAS_MARLINUI_U8GLIB, PAGE_CONTAINS(LCD_PIXEL_HEIGHT - MENU_FONT_HEIGHT, LCD_PIXEL_HEIGHT - 1));
         if (in_view) {
@@ -81,7 +81,7 @@
             lcd_put_u8str_P(GET_TEXT(MSG_BABYSTEP_TOTAL));
             lcd_put_wchar(':');
           #endif
-          lcd_put_u8str(BABYSTEP_TO_STR(spm * babystep.axis_total[BS_TOTAL_IND(axis)]));
+          lcd_put_u8str(BABYSTEP_TO_STR(mps * babystep.axis_total[BS_TOTAL_IND(axis)]));
         }
       #endif
     }

Marlin/src/lcd/tft/ui_1024x600.cpp

@@ -667,7 +667,7 @@ static void moveAxis(const AxisEnum axis, const int8_t direction) {
     #if ENABLED(BABYSTEP_ZPROBE_OFFSET)
       const int16_t babystep_increment = direction * BABYSTEP_SIZE_Z;
       const bool do_probe = DISABLED(BABYSTEP_HOTEND_Z_OFFSET) || active_extruder == 0;
-      const float bsDiff = planner.steps_to_mm[Z_AXIS] * babystep_increment,
+      const float bsDiff = planner.mm_per_step[Z_AXIS] * babystep_increment,
                   new_probe_offset = probe.offset.z + bsDiff,
                   new_offs = TERN(BABYSTEP_HOTEND_Z_OFFSET
                     , do_probe ? new_probe_offset : hotend_offset[active_extruder].z - bsDiff

Marlin/src/lcd/tft/ui_320x240.cpp

@@ -652,7 +652,7 @@ static void moveAxis(const AxisEnum axis, const int8_t direction) {
     #if ENABLED(BABYSTEP_ZPROBE_OFFSET)
       const int16_t babystep_increment = direction * BABYSTEP_SIZE_Z;
       const bool do_probe = DISABLED(BABYSTEP_HOTEND_Z_OFFSET) || active_extruder == 0;
-      const float bsDiff = planner.steps_to_mm[Z_AXIS] * babystep_increment,
+      const float bsDiff = planner.mm_per_step[Z_AXIS] * babystep_increment,
                   new_probe_offset = probe.offset.z + bsDiff,
                   new_offs = TERN(BABYSTEP_HOTEND_Z_OFFSET
                     , do_probe ? new_probe_offset : hotend_offset[active_extruder].z - bsDiff

Marlin/src/lcd/tft/ui_480x320.cpp

@@ -654,7 +654,7 @@ static void moveAxis(const AxisEnum axis, const int8_t direction) {
     #if ENABLED(BABYSTEP_ZPROBE_OFFSET)
       const int16_t babystep_increment = direction * BABYSTEP_SIZE_Z;
       const bool do_probe = DISABLED(BABYSTEP_HOTEND_Z_OFFSET) || active_extruder == 0;
-      const float bsDiff = planner.steps_to_mm[Z_AXIS] * babystep_increment,
+      const float bsDiff = planner.mm_per_step[Z_AXIS] * babystep_increment,
                   new_probe_offset = probe.offset.z + bsDiff,
                   new_offs = TERN(BABYSTEP_HOTEND_Z_OFFSET
                     , do_probe ? new_probe_offset : hotend_offset[active_extruder].z - bsDiff

Marlin/src/module/motion.cpp

@@ -1682,7 +1682,7 @@ void prepare_line_to_destination() {
       int16_t phaseDelta = (home_phase[axis] - phaseCurrent) * stepperBackoutDir;
 
       // Check if home distance within endstop assumed repeatability noise of .05mm and warn.
-      if (ABS(phaseDelta) * planner.steps_to_mm[axis] / phasePerUStep < 0.05f)
+      if (ABS(phaseDelta) * planner.mm_per_step[axis] / phasePerUStep < 0.05f)
         SERIAL_ECHOLNPGM("Selected home phase ", home_phase[axis],
                          " too close to endstop trigger phase ", phaseCurrent,
                          ". Pick a different phase for ", AS_CHAR(AXIS_CHAR(axis)));
@@ -1691,7 +1691,7 @@ void prepare_line_to_destination() {
       if (phaseDelta < 0) phaseDelta += 1024;
 
       // Convert TMC µsteps(phase) to whole Marlin µsteps to effector backout direction to mm
-      const float mmDelta = int16_t(phaseDelta / phasePerUStep) * effectorBackoutDir * planner.steps_to_mm[axis];
+      const float mmDelta = int16_t(phaseDelta / phasePerUStep) * effectorBackoutDir * planner.mm_per_step[axis];
 
       // Optional debug messages
       if (DEBUGGING(LEVELING)) {
@@ -1999,7 +1999,7 @@ void prepare_line_to_destination() {
       // Delta homing treats the axes as normal linear axes.
 
       const float adjDistance = delta_endstop_adj[axis],
-                  minDistance = (MIN_STEPS_PER_SEGMENT) * planner.steps_to_mm[axis];
+                  minDistance = (MIN_STEPS_PER_SEGMENT) * planner.mm_per_step[axis];
 
       // Retrace by the amount specified in delta_endstop_adj if more than min steps.
       if (adjDistance * (Z_HOME_DIR) < 0 && ABS(adjDistance) > minDistance) { // away from endstop, more than min distance

Marlin/src/module/planner.cpp

@@ -138,7 +138,7 @@ planner_settings_t Planner::settings;           // Initialized by settings.load(
 
 uint32_t Planner::max_acceleration_steps_per_s2[DISTINCT_AXES]; // (steps/s^2) Derived from mm_per_s2
 
-float Planner::steps_to_mm[DISTINCT_AXES];      // (mm) Millimeters per step
+float Planner::mm_per_step[DISTINCT_AXES];      // (mm) Millimeters per step
 
 #if HAS_JUNCTION_DEVIATION
   float Planner::junction_deviation_mm;         // (mm) M205 J
@@ -1702,7 +1702,7 @@ void Planner::endstop_triggered(const AxisEnum axis) {
 }
 
 float Planner::triggered_position_mm(const AxisEnum axis) {
-  return stepper.triggered_position(axis) * steps_to_mm[axis];
+  return stepper.triggered_position(axis) * mm_per_step[axis];
 }
 
 void Planner::finish_and_disable() {
@@ -1759,7 +1759,7 @@ float Planner::get_axis_position_mm(const AxisEnum axis) {
 
   #endif
 
-  return axis_steps * steps_to_mm[axis];
+  return axis_steps * mm_per_step[axis];
 }
 
 /**
@@ -2015,51 +2015,51 @@ bool Planner::_populate_block(block_t * const block, bool split_move,
   } steps_dist_mm;
   #if IS_CORE
     #if CORE_IS_XY
-      steps_dist_mm.head.x = da * steps_to_mm[A_AXIS];
-      steps_dist_mm.head.y = db * steps_to_mm[B_AXIS];
-      steps_dist_mm.z      = dc * steps_to_mm[Z_AXIS];
-      steps_dist_mm.a      = (da + db) * steps_to_mm[A_AXIS];
-      steps_dist_mm.b      = CORESIGN(da - db) * steps_to_mm[B_AXIS];
+      steps_dist_mm.head.x = da * mm_per_step[A_AXIS];
+      steps_dist_mm.head.y = db * mm_per_step[B_AXIS];
+      steps_dist_mm.z      = dc * mm_per_step[Z_AXIS];
+      steps_dist_mm.a      = (da + db) * mm_per_step[A_AXIS];
+      steps_dist_mm.b      = CORESIGN(da - db) * mm_per_step[B_AXIS];
     #elif CORE_IS_XZ
-      steps_dist_mm.head.x = da * steps_to_mm[A_AXIS];
-      steps_dist_mm.y      = db * steps_to_mm[Y_AXIS];
-      steps_dist_mm.head.z = dc * steps_to_mm[C_AXIS];
-      steps_dist_mm.a      = (da + dc) * steps_to_mm[A_AXIS];
-      steps_dist_mm.c      = CORESIGN(da - dc) * steps_to_mm[C_AXIS];
+      steps_dist_mm.head.x = da * mm_per_step[A_AXIS];
+      steps_dist_mm.y      = db * mm_per_step[Y_AXIS];
+      steps_dist_mm.head.z = dc * mm_per_step[C_AXIS];
+      steps_dist_mm.a      = (da + dc) * mm_per_step[A_AXIS];
+      steps_dist_mm.c      = CORESIGN(da - dc) * mm_per_step[C_AXIS];
     #elif CORE_IS_YZ
-      steps_dist_mm.x      = da * steps_to_mm[X_AXIS];
-      steps_dist_mm.head.y = db * steps_to_mm[B_AXIS];
-      steps_dist_mm.head.z = dc * steps_to_mm[C_AXIS];
-      steps_dist_mm.b      = (db + dc) * steps_to_mm[B_AXIS];
-      steps_dist_mm.c      = CORESIGN(db - dc) * steps_to_mm[C_AXIS];
+      steps_dist_mm.x      = da * mm_per_step[X_AXIS];
+      steps_dist_mm.head.y = db * mm_per_step[B_AXIS];
+      steps_dist_mm.head.z = dc * mm_per_step[C_AXIS];
+      steps_dist_mm.b      = (db + dc) * mm_per_step[B_AXIS];
+      steps_dist_mm.c      = CORESIGN(db - dc) * mm_per_step[C_AXIS];
     #endif
     #if LINEAR_AXES >= 4
-      steps_dist_mm.i = di * steps_to_mm[I_AXIS];
+      steps_dist_mm.i = di * mm_per_step[I_AXIS];
     #endif
     #if LINEAR_AXES >= 5
-      steps_dist_mm.j = dj * steps_to_mm[J_AXIS];
+      steps_dist_mm.j = dj * mm_per_step[J_AXIS];
     #endif
     #if LINEAR_AXES >= 6
-      steps_dist_mm.k = dk * steps_to_mm[K_AXIS];
+      steps_dist_mm.k = dk * mm_per_step[K_AXIS];
     #endif
   #elif ENABLED(MARKFORGED_XY)
-    steps_dist_mm.head.x = da * steps_to_mm[A_AXIS];
-    steps_dist_mm.head.y = db * steps_to_mm[B_AXIS];
-    steps_dist_mm.z      = dc * steps_to_mm[Z_AXIS];
-    steps_dist_mm.a      = (da - db) * steps_to_mm[A_AXIS];
-    steps_dist_mm.b      = db * steps_to_mm[B_AXIS];
+    steps_dist_mm.head.x = da * mm_per_step[A_AXIS];
+    steps_dist_mm.head.y = db * mm_per_step[B_AXIS];
+    steps_dist_mm.z      = dc * mm_per_step[Z_AXIS];
+    steps_dist_mm.a      = (da - db) * mm_per_step[A_AXIS];
+    steps_dist_mm.b      = db * mm_per_step[B_AXIS];
   #else
     LINEAR_AXIS_CODE(
-      steps_dist_mm.a = da * steps_to_mm[A_AXIS],
-      steps_dist_mm.b = db * steps_to_mm[B_AXIS],
-      steps_dist_mm.c = dc * steps_to_mm[C_AXIS],
-      steps_dist_mm.i = di * steps_to_mm[I_AXIS],
-      steps_dist_mm.j = dj * steps_to_mm[J_AXIS],
-      steps_dist_mm.k = dk * steps_to_mm[K_AXIS]
+      steps_dist_mm.a = da * mm_per_step[A_AXIS],
+      steps_dist_mm.b = db * mm_per_step[B_AXIS],
+      steps_dist_mm.c = dc * mm_per_step[C_AXIS],
+      steps_dist_mm.i = di * mm_per_step[I_AXIS],
+      steps_dist_mm.j = dj * mm_per_step[J_AXIS],
+      steps_dist_mm.k = dk * mm_per_step[K_AXIS]
     );
   #endif
 
-  TERN_(HAS_EXTRUDERS, steps_dist_mm.e = esteps_float * steps_to_mm[E_AXIS_N(extruder)]);
+  TERN_(HAS_EXTRUDERS, steps_dist_mm.e = esteps_float * mm_per_step[E_AXIS_N(extruder)]);
 
   TERN_(LCD_SHOW_E_TOTAL, e_move_accumulator += steps_dist_mm.e);
 
@@ -2889,7 +2889,7 @@ bool Planner::buffer_segment(const abce_pos_t &abce
   // When changing extruders recalculate steps corresponding to the E position
   #if ENABLED(DISTINCT_E_FACTORS)
     if (last_extruder != extruder && settings.axis_steps_per_mm[E_AXIS_N(extruder)] != settings.axis_steps_per_mm[E_AXIS_N(last_extruder)]) {
-      position.e = LROUND(position.e * settings.axis_steps_per_mm[E_AXIS_N(extruder)] * steps_to_mm[E_AXIS_N(last_extruder)]);
+      position.e = LROUND(position.e * settings.axis_steps_per_mm[E_AXIS_N(extruder)] * mm_per_step[E_AXIS_N(last_extruder)]);
       last_extruder = extruder;
     }
   #endif
@@ -3168,11 +3168,11 @@ void Planner::reset_acceleration_rates() {
 }
 
 /**
- * Recalculate 'position' and 'steps_to_mm'.
+ * Recalculate 'position' and 'mm_per_step'.
  * Must be called whenever settings.axis_steps_per_mm changes!
  */
 void Planner::refresh_positioning() {
-  LOOP_DISTINCT_AXES(i) steps_to_mm[i] = 1.0f / settings.axis_steps_per_mm[i];
+  LOOP_DISTINCT_AXES(i) mm_per_step[i] = 1.0f / settings.axis_steps_per_mm[i];
   set_position_mm(current_position);
   reset_acceleration_rates();
 }

Marlin/src/module/planner.h

@@ -374,7 +374,7 @@ class Planner {
     #endif
 
     static uint32_t max_acceleration_steps_per_s2[DISTINCT_AXES]; // (steps/s^2) Derived from mm_per_s2
-    static float steps_to_mm[DISTINCT_AXES];          // Millimeters per step
+    static float mm_per_step[DISTINCT_AXES];          // Millimeters per step
 
     #if HAS_JUNCTION_DEVIATION
       static float junction_deviation_mm;             // (mm) M205 J
@@ -489,7 +489,7 @@ class Planner {
     static void reset_acceleration_rates();
 
     /**
-     * Recalculate 'position' and 'steps_to_mm'.
+     * Recalculate 'position' and 'mm_per_step'.
      * Must be called whenever settings.axis_steps_per_mm changes!
      */
     static void refresh_positioning();

Marlin/src/module/settings.cpp

@@ -557,7 +557,7 @@ void MarlinSettings::postprocess() {
 
   TERN_(EXTENSIBLE_UI, ExtUI::onPostprocessSettings());
 
-  // Refresh steps_to_mm with the reciprocal of axis_steps_per_mm
+  // Refresh mm_per_step with the reciprocal of axis_steps_per_mm
   // and init stepper.count[], planner.position[] with current_position
   planner.refresh_positioning();
 

Marlin/src/module/temperature.cpp

@@ -1102,7 +1102,7 @@ void Temperature::min_temp_error(const heater_id_t heater_id) {
                 lpq[lpq_ptr] = 0;
 
               if (++lpq_ptr >= lpq_len) lpq_ptr = 0;
-              work_pid[ee].Kc = (lpq[lpq_ptr] * planner.steps_to_mm[E_AXIS]) * PID_PARAM(Kc, ee);
+              work_pid[ee].Kc = (lpq[lpq_ptr] * planner.mm_per_step[E_AXIS]) * PID_PARAM(Kc, ee);
               pid_output += work_pid[ee].Kc;
             }
           #endif // PID_EXTRUSION_SCALING