Apply REPEAT, RREPEAT, and loop macros (#16757)

Marlin/src/core/macros.h

 // Repeat a macro passing 0...N-1 plus additional arguments.
 #define REPEAT2_S(S,N,OP,V...)  EVAL(_REPEAT2(S,SUB##S(N),OP,V))
 #define REPEAT2(N,OP,V...)      REPEAT2_S(0,N,OP,V)
+
+// Use RREPEAT macros with REPEAT macros for nesting
+#define _RREPEAT(_RPT_I,_RPT_N,_RPT_OP)                           \
+  _RPT_OP(_RPT_I)                                                 \
+  IF_ELSE(SUB1(_RPT_N))                                           \
+    ( DEFER2(__RREPEAT)()(ADD1(_RPT_I),SUB1(_RPT_N),_RPT_OP) )    \
+    ( /* Do nothing */ )
+#define __RREPEAT() _RREPEAT
+#define _RREPEAT2(_RPT_I,_RPT_N,_RPT_OP,V...)                     \
+  _RPT_OP(_RPT_I,V)                                               \
+  IF_ELSE(SUB1(_RPT_N))                                           \
+    ( DEFER2(__RREPEAT2)()(ADD1(_RPT_I),SUB1(_RPT_N),_RPT_OP,V) ) \
+    ( /* Do nothing */ )
+#define __RREPEAT2() _RREPEAT2
+#define RREPEAT_S(S,N,OP)        EVAL(_RREPEAT(S,SUB##S(N),OP))
+#define RREPEAT(N,OP)            RREPEAT_S(0,N,OP)
+#define RREPEAT2_S(S,N,OP,V...)  EVAL(_RREPEAT2(S,SUB##S(N),OP,V))
+#define RREPEAT2(N,OP,V...)      RREPEAT2_S(0,N,OP,V)

Marlin/src/feature/runout.h

         #define INIT_RUNOUT_PIN(P) SET_INPUT(P)
       #endif
 
-      INIT_RUNOUT_PIN(FIL_RUNOUT_PIN);
-      #if NUM_RUNOUT_SENSORS > 1
-        INIT_RUNOUT_PIN(FIL_RUNOUT2_PIN);
-        #if NUM_RUNOUT_SENSORS > 2
-          INIT_RUNOUT_PIN(FIL_RUNOUT3_PIN);
-          #if NUM_RUNOUT_SENSORS > 3
-            INIT_RUNOUT_PIN(FIL_RUNOUT4_PIN);
-            #if NUM_RUNOUT_SENSORS > 4
-              INIT_RUNOUT_PIN(FIL_RUNOUT5_PIN);
-              #if NUM_RUNOUT_SENSORS > 5
-                INIT_RUNOUT_PIN(FIL_RUNOUT6_PIN);
-              #endif
-            #endif
-          #endif
-        #endif
-      #endif
+      #define _INIT_RUNOUT(N) INIT_RUNOUT_PIN(FIL_RUNOUT##N##_PIN);
+      REPEAT_S(1, INCREMENT(NUM_RUNOUT_SENSORS), _INIT_RUNOUT)
+      #undef _INIT_RUNOUT
     }
 
     // Return a bitmask of runout pin states
     static inline uint8_t poll_runout_pins() {
-      return (
-        (READ(FIL_RUNOUT_PIN ) ? _BV(0) : 0)
-        #if NUM_RUNOUT_SENSORS > 1
-          | (READ(FIL_RUNOUT2_PIN) ? _BV(1) : 0)
-          #if NUM_RUNOUT_SENSORS > 2
-            | (READ(FIL_RUNOUT3_PIN) ? _BV(2) : 0)
-            #if NUM_RUNOUT_SENSORS > 3
-              | (READ(FIL_RUNOUT4_PIN) ? _BV(3) : 0)
-              #if NUM_RUNOUT_SENSORS > 4
-                | (READ(FIL_RUNOUT5_PIN) ? _BV(4) : 0)
-                #if NUM_RUNOUT_SENSORS > 5
-                  | (READ(FIL_RUNOUT6_PIN) ? _BV(5) : 0)
-                #endif
-              #endif
-            #endif
-          #endif
-        #endif
-      );
+      #define _OR_RUNOUT(N) | (READ(FIL_RUNOUT##N##_PIN) ? _BV((N) - 1) : 0)
+      return (0 REPEAT_S(1, INCREMENT(NUM_RUNOUT_SENSORS), _OR_RUNOUT));
+      #undef _OR_RUNOUT
     }
 
     // Return a bitmask of runout flag states (1 bits always indicates runout)
     static inline uint8_t poll_runout_states() {
-      return poll_runout_pins() ^ uint8_t(
+      return (poll_runout_pins()
         #if DISABLED(FIL_RUNOUT_INVERTING)
-          _BV(NUM_RUNOUT_SENSORS) - 1
-        #else
-          0
+          ^ uint8_t(_BV(NUM_RUNOUT_SENSORS) - 1)
         #endif
       );
     }
+
+  #undef INIT_RUNOUT_PIN
 };
 
 #if ENABLED(FILAMENT_MOTION_SENSOR)

Marlin/src/gcode/calibrate/M666.cpp

         SERIAL_ECHOPAIR(" Y2:", endstops.y2_endstop_adj);
       #endif
       #if ENABLED(Z_MULTI_ENDSTOPS)
-        SERIAL_ECHOPAIR(" Z2:", endstops.z2_endstop_adj);
-        #if NUM_Z_STEPPER_DRIVERS >= 3
-          SERIAL_ECHOPAIR(" Z3:", endstops.z3_endstop_adj);
-          #if NUM_Z_STEPPER_DRIVERS >= 4
-            SERIAL_ECHOPAIR(" Z4:", endstops.z4_endstop_adj);
-          #endif
-        #endif
+        #define _ECHO_ZADJ(N) SERIAL_ECHOPAIR(" Z" STRINGIFY(N) ":", endstops.z##N##_endstop_adj);
+        REPEAT_S(2, INCREMENT(NUM_Z_STEPPER_DRIVERS), _ECHO_ZADJ)
       #endif
       SERIAL_EOL();
     }

Marlin/src/gcode/config/M301.cpp

     SERIAL_ECHO_START();
     #if ENABLED(PID_PARAMS_PER_HOTEND)
       SERIAL_ECHOPAIR(" e:", e); // specify extruder in serial output
-    #endif // PID_PARAMS_PER_HOTEND
+    #endif
     SERIAL_ECHOPAIR(" p:", PID_PARAM(Kp, e),
                     " i:", unscalePID_i(PID_PARAM(Ki, e)),
                     " d:", unscalePID_d(PID_PARAM(Kd, e)));

Marlin/src/lcd/menu/menu_advanced.cpp

 #if ENABLED(PID_AUTOTUNE_MENU)
   #define DEFINE_PIDTEMP_FUNCS(N) \
     _DEFINE_PIDTEMP_BASE_FUNCS(N); \
-    void lcd_autotune_callback_E##N() { _lcd_autotune(N); } //
+    void lcd_autotune_callback_E##N() { _lcd_autotune(N); }
 #else
-  #define DEFINE_PIDTEMP_FUNCS(N) _DEFINE_PIDTEMP_BASE_FUNCS(N); //
+  #define DEFINE_PIDTEMP_FUNCS(N) _DEFINE_PIDTEMP_BASE_FUNCS(N);
 #endif
 
 #if HOTENDS
   DEFINE_PIDTEMP_FUNCS(0);
   #if HOTENDS > 1 && ENABLED(PID_PARAMS_PER_HOTEND)
-    DEFINE_PIDTEMP_FUNCS(1);
-    #if HOTENDS > 2
-      DEFINE_PIDTEMP_FUNCS(2);
-      #if HOTENDS > 3
-        DEFINE_PIDTEMP_FUNCS(3);
-        #if HOTENDS > 4
-          DEFINE_PIDTEMP_FUNCS(4);
-          #if HOTENDS > 5
-            DEFINE_PIDTEMP_FUNCS(5);
-            #if HOTENDS > 6
-              DEFINE_PIDTEMP_FUNCS(6);
-              #if HOTENDS > 7
-                DEFINE_PIDTEMP_FUNCS(7);
-              #endif // HOTENDS > 7
-            #endif // HOTENDS > 6
-          #endif // HOTENDS > 5
-        #endif // HOTENDS > 4
-      #endif // HOTENDS > 3
-    #endif // HOTENDS > 2
-  #endif // HOTENDS > 1 && PID_PARAMS_PER_HOTEND
-#endif // HOTENDS
+    REPEAT_S(1, HOTENDS, DEFINE_PIDTEMP_FUNCS)
+  #endif
+#endif
 
 #define SHOW_MENU_ADVANCED_TEMPERATURE ((ENABLED(AUTOTEMP) && HAS_TEMP_HOTEND) || EITHER(PID_AUTOTUNE_MENU, PID_EDIT_MENU))
 
     #if ENABLED(PID_AUTOTUNE_MENU)
       #define PID_EDIT_MENU_ITEMS(N) \
         _PID_EDIT_MENU_ITEMS(N); \
-        EDIT_ITEM_FAST_N(int3, N, MSG_PID_AUTOTUNE_E, &autotune_temp[N], 150, heater_maxtemp[N] - 15, []{ _lcd_autotune(MenuItemBase::itemIndex); })
+        EDIT_ITEM_FAST_N(int3, N, MSG_PID_AUTOTUNE_E, &autotune_temp[N], 150, heater_maxtemp[N] - 15, []{ _lcd_autotune(MenuItemBase::itemIndex); });
     #else
-      #define PID_EDIT_MENU_ITEMS(N) _PID_EDIT_MENU_ITEMS(N)
+      #define PID_EDIT_MENU_ITEMS(N) _PID_EDIT_MENU_ITEMS(N);
     #endif
 
     PID_EDIT_MENU_ITEMS(0);
     #if HOTENDS > 1 && ENABLED(PID_PARAMS_PER_HOTEND)
-      PID_EDIT_MENU_ITEMS(1);
-      #if HOTENDS > 2
-        PID_EDIT_MENU_ITEMS(2);
-        #if HOTENDS > 3
-          PID_EDIT_MENU_ITEMS(3);
-          #if HOTENDS > 4
-            PID_EDIT_MENU_ITEMS(4);
-            #if HOTENDS > 5
-              PID_EDIT_MENU_ITEMS(5);
-              #if HOTENDS > 6
-                PID_EDIT_MENU_ITEMS(6);
-                #if HOTENDS > 7
-                  PID_EDIT_MENU_ITEMS(7);
-                #endif // HOTENDS > 7
-              #endif // HOTENDS > 6
-            #endif // HOTENDS > 5
-          #endif // HOTENDS > 4
-        #endif // HOTENDS > 3
-      #endif // HOTENDS > 2
-    #endif // HOTENDS > 1 && PID_PARAMS_PER_HOTEND
+      REPEAT_S(1, HOTENDS, PID_EDIT_MENU_ITEMS)
+    #endif
 
     END_MENU();
   }

Marlin/src/module/configuration_store.cpp

         false
       #endif
     ;
-    for (uint8_t q = 0; q < COUNT(planner.filament_size); q++)
+    LOOP_L_N(q, COUNT(planner.filament_size))
       planner.filament_size[q] = DEFAULT_NOMINAL_FILAMENT_DIA;
 
   #endif
   //
 
   #if ENABLED(ADVANCED_PAUSE_FEATURE)
-    for (uint8_t e = 0; e < EXTRUDERS; e++) {
+    LOOP_L_N(e, EXTRUDERS) {
       fc_settings[e].unload_length = FILAMENT_CHANGE_UNLOAD_LENGTH;
       fc_settings[e].load_length = FILAMENT_CHANGE_FAST_LOAD_LENGTH;
     }
           SERIAL_ECHOLNPGM(" Disabled");
       }
 
-      CONFIG_ECHO_START();
-      SERIAL_ECHOLNPAIR("  M200 D", LINEAR_UNIT(planner.filament_size[0]));
-      #if EXTRUDERS > 1
+      #if EXTRUDERS == 1
         CONFIG_ECHO_START();
-        SERIAL_ECHOLNPAIR("  M200 T1 D", LINEAR_UNIT(planner.filament_size[1]));
-        #if EXTRUDERS > 2
+        SERIAL_ECHOLNPAIR("  M200 D", LINEAR_UNIT(planner.filament_size[0]));
+      #elif EXTRUDERS
+        LOOP_L_N(i, EXTRUDERS) {
           CONFIG_ECHO_START();
-          SERIAL_ECHOLNPAIR("  M200 T2 D", LINEAR_UNIT(planner.filament_size[2]));
-          #if EXTRUDERS > 3
-            CONFIG_ECHO_START();
-            SERIAL_ECHOLNPAIR("  M200 T3 D", LINEAR_UNIT(planner.filament_size[3]));
-            #if EXTRUDERS > 4
-              CONFIG_ECHO_START();
-              SERIAL_ECHOLNPAIR("  M200 T4 D", LINEAR_UNIT(planner.filament_size[4]));
-              #if EXTRUDERS > 5
-                CONFIG_ECHO_START();
-                SERIAL_ECHOLNPAIR("  M200 T5 D", LINEAR_UNIT(planner.filament_size[5]));
-                #if EXTRUDERS > 6
-                  CONFIG_ECHO_START();
-                  SERIAL_ECHOLNPAIR("  M200 T6 D", LINEAR_UNIT(planner.filament_size[6]));
-                  #if EXTRUDERS > 7
-                    CONFIG_ECHO_START();
-                    SERIAL_ECHOLNPAIR("  M200 T7 D", LINEAR_UNIT(planner.filament_size[7]));
-                  #endif // EXTRUDERS > 7
-                #endif // EXTRUDERS > 6
-              #endif // EXTRUDERS > 5
-            #endif // EXTRUDERS > 4
-          #endif // EXTRUDERS > 3
-        #endif // EXTRUDERS > 2
-      #endif // EXTRUDERS > 1
+          SERIAL_ECHOPGM("  M200");
+          if (i) SERIAL_ECHOPAIR_P(SP_T_STR, int(i));
+          SERIAL_ECHOLNPAIR(" D", LINEAR_UNIT(planner.filament_size[i]));
+        }
+      #endif
 
       if (!parser.volumetric_enabled)
         CONFIG_ECHO_MSG("  M200 D0");
     );
     #if ENABLED(DISTINCT_E_FACTORS)
       CONFIG_ECHO_START();
-      for (uint8_t i = 0; i < E_STEPPERS; i++) {
+      LOOP_L_N(i, E_STEPPERS) {
         SERIAL_ECHOLNPAIR_P(
             PSTR("  M203 T"), (int)i
           , SP_E_STR, VOLUMETRIC_UNIT(planner.settings.max_feedrate_mm_s[E_AXIS_N(i)])
     );
     #if ENABLED(DISTINCT_E_FACTORS)
       CONFIG_ECHO_START();
-      for (uint8_t i = 0; i < E_STEPPERS; i++)
+      LOOP_L_N(i, E_STEPPERS)
         SERIAL_ECHOLNPAIR_P(
             PSTR("  M201 T"), (int)i
           , SP_E_STR, VOLUMETRIC_UNIT(planner.settings.max_acceleration_mm_per_s2[E_AXIS_N(i)])
       #if ENABLED(MESH_BED_LEVELING)
 
         if (leveling_is_valid()) {
-          for (uint8_t py = 0; py < GRID_MAX_POINTS_Y; py++) {
-            for (uint8_t px = 0; px < GRID_MAX_POINTS_X; px++) {
+          LOOP_L_N(py, GRID_MAX_POINTS_Y) {
+            LOOP_L_N(px, GRID_MAX_POINTS_X) {
               CONFIG_ECHO_START();
               SERIAL_ECHOPAIR_P(PSTR("  G29 S3 I"), (int)px, PSTR(" J"), (int)py);
               SERIAL_ECHOLNPAIR_F_P(SP_Z_STR, LINEAR_UNIT(mbl.z_values[px][py]), 5);
       #elif ENABLED(AUTO_BED_LEVELING_BILINEAR)
 
         if (leveling_is_valid()) {
-          for (uint8_t py = 0; py < GRID_MAX_POINTS_Y; py++) {
-            for (uint8_t px = 0; px < GRID_MAX_POINTS_X; px++) {
+          LOOP_L_N(py, GRID_MAX_POINTS_Y) {
+            LOOP_L_N(px, GRID_MAX_POINTS_X) {
               CONFIG_ECHO_START();
               SERIAL_ECHOPAIR("  G29 W I", (int)px, " J", (int)py);
               SERIAL_ECHOLNPAIR_F_P(SP_Z_STR, LINEAR_UNIT(z_values[px][py]), 5);
     #if ENABLED(EDITABLE_SERVO_ANGLES)
 
       CONFIG_ECHO_HEADING("Servo Angles:");
-      for (uint8_t i = 0; i < NUM_SERVOS; i++) {
+      LOOP_L_N(i, NUM_SERVOS) {
         switch (i) {
           #if ENABLED(SWITCHING_EXTRUDER)
             case SWITCHING_EXTRUDER_SERVO_NR:
     #if HOTENDS && HAS_LCD_MENU
 
       CONFIG_ECHO_HEADING("Material heatup parameters:");
-      for (uint8_t i = 0; i < COUNT(ui.preheat_hotend_temp); i++) {
+      LOOP_L_N(i, COUNT(ui.preheat_hotend_temp)) {
         CONFIG_ECHO_START();
         SERIAL_ECHOLNPAIR(
             "  M145 S", (int)i
 
     #if HAS_USER_THERMISTORS
       CONFIG_ECHO_HEADING("User thermistors:");
-      for (uint8_t i = 0; i < USER_THERMISTORS; i++)
+      LOOP_L_N(i, USER_THERMISTORS)
         thermalManager.log_user_thermistor(i, true);
     #endif
 
         say_M603(forReplay);
         SERIAL_ECHOLNPAIR("L", LINEAR_UNIT(fc_settings[0].load_length), " U", LINEAR_UNIT(fc_settings[0].unload_length));
       #else
-        #define _ECHO_603(N) do{ say_M603(forReplay); SERIAL_ECHOLNPAIR("T" STRINGIFY(N) " L", LINEAR_UNIT(fc_settings[N].load_length), " U", LINEAR_UNIT(fc_settings[N].unload_length)); }while(0)
-        _ECHO_603(0);
-        _ECHO_603(1);
-        #if EXTRUDERS > 2
-          _ECHO_603(2);
-          #if EXTRUDERS > 3
-            _ECHO_603(3);
-            #if EXTRUDERS > 4
-              _ECHO_603(4);
-              #if EXTRUDERS > 5
-                _ECHO_603(5);
-                #if EXTRUDERS > 6
-                  _ECHO_603(6);
-                  #if EXTRUDERS > 7
-                    _ECHO_603(7);
-                  #endif // EXTRUDERS > 7
-                #endif // EXTRUDERS > 6
-              #endif // EXTRUDERS > 5
-            #endif // EXTRUDERS > 4
-          #endif // EXTRUDERS > 3
-        #endif // EXTRUDERS > 2
-      #endif // EXTRUDERS == 1
-    #endif // ADVANCED_PAUSE_FEATURE
+        #define _ECHO_603(N) do{ say_M603(forReplay); SERIAL_ECHOLNPAIR("T" STRINGIFY(N) " L", LINEAR_UNIT(fc_settings[N].load_length), " U", LINEAR_UNIT(fc_settings[N].unload_length)); }while(0);
+        REPEAT(EXTRUDERS, _ECHO_603)
+      #endif
+    #endif
 
     #if EXTRUDERS > 1
       CONFIG_ECHO_HEADING("Tool-changing:");

Marlin/src/module/endstops.cpp

     #if NUM_RUNOUT_SENSORS == 1
       print_es_state(READ(FIL_RUNOUT_PIN) != FIL_RUNOUT_INVERTING, PSTR(MSG_FILAMENT_RUNOUT_SENSOR));
     #else
+      #define _CASE_RUNOUT(N) case N: pin = FIL_RUNOUT##N##_PIN; break;
       for (uint8_t i = 1; i <= NUM_RUNOUT_SENSORS; i++) {
         pin_t pin;
         switch (i) {
           default: continue;
-          case 1: pin = FIL_RUNOUT_PIN; break;
-          case 2: pin = FIL_RUNOUT2_PIN; break;
-          #if NUM_RUNOUT_SENSORS >= 3
-            case 3: pin = FIL_RUNOUT3_PIN; break;
-            #if NUM_RUNOUT_SENSORS >= 4
-              case 4: pin = FIL_RUNOUT4_PIN; break;
-              #if NUM_RUNOUT_SENSORS >= 5
-                case 5: pin = FIL_RUNOUT5_PIN; break;
-                #if NUM_RUNOUT_SENSORS >= 6
-                  case 6: pin = FIL_RUNOUT6_PIN; break;
-                  #if NUM_RUNOUT_SENSORS >= 7
-                    case 7: pin = FIL_RUNOUT7_PIN; break;
-                    #if NUM_RUNOUT_SENSORS >= 8
-                      case 8: pin = FIL_RUNOUT8_PIN; break;
-                    #endif
-                  #endif
-                #endif
-              #endif
-            #endif
-          #endif
+          REPEAT_S(1, INCREMENT(NUM_RUNOUT_SENSORS), _CASE_RUNOUT)
         }
         SERIAL_ECHOPGM(MSG_FILAMENT_RUNOUT_SENSOR);
         if (i > 1) SERIAL_CHAR(' ', '0' + i);
         print_es_state(extDigitalRead(pin) != FIL_RUNOUT_INVERTING);
       }
+      #undef _CASE_RUNOUT
     #endif
   #endif
   #if ENABLED(BLTOUCH)

Marlin/src/module/stepper/indirection.h

 //
 
 #if ENABLED(MIXING_EXTRUDER)
-
   /**
    * Mixing steppers keep all their enable (and direction) states synchronized
    */
-  #if MIXING_STEPPERS > 7
-    #define  ENABLE_AXIS_E0() { ENABLE_STEPPER_E0();  ENABLE_STEPPER_E1();  ENABLE_STEPPER_E2();  ENABLE_STEPPER_E3();  ENABLE_STEPPER_E4();  ENABLE_STEPPER_E5();  ENABLE_STEPPER_E6();  ENABLE_STEPPER_E7(); }
-    #define DISABLE_AXIS_E0() { DISABLE_STEPPER_E0(); DISABLE_STEPPER_E1(); DISABLE_STEPPER_E2(); DISABLE_STEPPER_E3(); DISABLE_STEPPER_E4(); DISABLE_STEPPER_E5(); DISABLE_STEPPER_E6(); DISABLE_STEPPER_E7(); }
-  #elif MIXING_STEPPERS > 6
-    #define  ENABLE_AXIS_E0() { ENABLE_STEPPER_E0();  ENABLE_STEPPER_E1();  ENABLE_STEPPER_E2();  ENABLE_STEPPER_E3();  ENABLE_STEPPER_E4();  ENABLE_STEPPER_E5();  ENABLE_STEPPER_E6(); }
-    #define DISABLE_AXIS_E0() { DISABLE_STEPPER_E0(); DISABLE_STEPPER_E1(); DISABLE_STEPPER_E2(); DISABLE_STEPPER_E3(); DISABLE_STEPPER_E4(); DISABLE_STEPPER_E5(); DISABLE_STEPPER_E6(); }
-  #elif MIXING_STEPPERS > 5
-    #define  ENABLE_AXIS_E0() { ENABLE_STEPPER_E0();  ENABLE_STEPPER_E1();  ENABLE_STEPPER_E2();  ENABLE_STEPPER_E3();  ENABLE_STEPPER_E4();  ENABLE_STEPPER_E5(); }
-    #define DISABLE_AXIS_E0() { DISABLE_STEPPER_E0(); DISABLE_STEPPER_E1(); DISABLE_STEPPER_E2(); DISABLE_STEPPER_E3(); DISABLE_STEPPER_E4(); DISABLE_STEPPER_E5(); }
-  #elif MIXING_STEPPERS > 4
-    #define  ENABLE_AXIS_E0() { ENABLE_STEPPER_E0();  ENABLE_STEPPER_E1();  ENABLE_STEPPER_E2();  ENABLE_STEPPER_E3();  ENABLE_STEPPER_E4(); }
-    #define DISABLE_AXIS_E0() { DISABLE_STEPPER_E0(); DISABLE_STEPPER_E1(); DISABLE_STEPPER_E2(); DISABLE_STEPPER_E3(); DISABLE_STEPPER_E4(); }
-  #elif MIXING_STEPPERS > 3
-    #define  ENABLE_AXIS_E0() { ENABLE_STEPPER_E0();  ENABLE_STEPPER_E1();  ENABLE_STEPPER_E2();  ENABLE_STEPPER_E3(); }
-    #define DISABLE_AXIS_E0() { DISABLE_STEPPER_E0(); DISABLE_STEPPER_E1(); DISABLE_STEPPER_E2(); DISABLE_STEPPER_E3(); }
-  #elif MIXING_STEPPERS > 2
-    #define  ENABLE_AXIS_E0() { ENABLE_STEPPER_E0();  ENABLE_STEPPER_E1();  ENABLE_STEPPER_E2(); }
-    #define DISABLE_AXIS_E0() { DISABLE_STEPPER_E0(); DISABLE_STEPPER_E1(); DISABLE_STEPPER_E2(); }
-  #else
-    #define  ENABLE_AXIS_E0() { ENABLE_STEPPER_E0();  ENABLE_STEPPER_E1(); }
-    #define DISABLE_AXIS_E0() { DISABLE_STEPPER_E0(); DISABLE_STEPPER_E1(); }
-  #endif
-
-#endif // !MIXING_EXTRUDER
+  #define _CALL_ENA_E(N)  ENABLE_STEPPER_E##N () ;
+  #define _CALL_DIS_E(N) DISABLE_STEPPER_E##N () ;
+  #define  ENABLE_AXIS_E0() { RREPEAT(MIXING_STEPPERS, _CALL_ENA_E) }
+  #define DISABLE_AXIS_E0() { RREPEAT(MIXING_STEPPERS, _CALL_DIS_E) }
+#endif
 
 #ifndef ENABLE_AXIS_E0
   #if E_STEPPERS > 0 && HAS_E0_ENABLE

Marlin/src/module/temperature.cpp

     static const uint8_t fanBit[] PROGMEM = {
       0
       #if HOTENDS > 1
-        , REPEAT2(1,_EFAN,1) 1
-        #if HOTENDS > 2
-          , REPEAT2(2,_EFAN,2) 2
-          #if HOTENDS > 3
-            , REPEAT2(3,_EFAN,3) 3
-            #if HOTENDS > 4
-              , REPEAT2(4,_EFAN,4) 4
-              #if HOTENDS > 5
-                , REPEAT2(5,_EFAN,5) 5
-                #if HOTENDS > 6
-                  , REPEAT2(6,_EFAN,6) 6
-                  #if HOTENDS > 7
-                    , REPEAT2(7,_EFAN,7) 7
-                  #endif
-                #endif
-              #endif
-            #endif
-          #endif
-        #endif
+        #define _NEXT_FAN(N) , REPEAT2(N,_EFAN,N) N
+        RREPEAT_S(1, HOTENDS, _NEXT_FAN)
       #endif
       #if HAS_AUTO_CHAMBER_FAN
         #define _CFAN(B) _FANOVERLAP(CHAMBER,B) ? B :
     pause(false);
   #endif
 
-  #define DISABLE_HEATER(NR) { \
-    setTargetHotend(0, NR); \
-    temp_hotend[NR].soft_pwm_amount = 0; \
-    WRITE_HEATER_ ##NR (LOW); \
+  #define DISABLE_HEATER(N) {           \
+    setTargetHotend(0, N);              \
+    temp_hotend[N].soft_pwm_amount = 0; \
+    WRITE_HEATER_##N(LOW);              \
   }
 
   #if HAS_TEMP_HOTEND

Marlin/src/pins/pins.h

   #define Z_MIN_PIN          -1
 #endif
 
+#if HAS_FILAMENT_SENSOR
+  #define FIL_RUNOUT1_PIN FIL_RUNOUT_PIN
+#endif
+
 #ifndef LCD_PINS_D4
   #define LCD_PINS_D4 -1
 #endif