Gradual step towards EXTRUDERS 0 support

Marlin/src/feature/controllerfan.cpp

@@ -53,6 +53,7 @@ void controllerfan_update() {
         #if HAS_Z3_ENABLE
           || Z3_ENABLE_READ == Z_ENABLE_ON
         #endif
+        #if E_STEPPERS
           || E0_ENABLE_READ == E_ENABLE_ON
           #if E_STEPPERS > 1
             || E1_ENABLE_READ == E_ENABLE_ON
@@ -64,11 +65,12 @@ void controllerfan_update() {
                   || E4_ENABLE_READ == E_ENABLE_ON
                   #if E_STEPPERS > 5
                     || E5_ENABLE_READ == E_ENABLE_ON
-                #endif
+                  #endif // E_STEPPERS > 5
-              #endif
+                #endif // E_STEPPERS > 4
-            #endif
+              #endif // E_STEPPERS > 3
-          #endif
+            #endif // E_STEPPERS > 2
-        #endif
+          #endif // E_STEPPERS > 1
+        #endif // E_STEPPERS
     ) {
       lastMotorOn = ms; //... set time to NOW so the fan will turn on
     }

Marlin/src/feature/power.cpp

@@ -64,6 +64,7 @@ bool Power::is_power_needed() {
       #if HAS_Z2_ENABLE
         || Z2_ENABLE_READ == Z_ENABLE_ON
       #endif
+      #if E_STEPPERS
         || E0_ENABLE_READ == E_ENABLE_ON
         #if E_STEPPERS > 1
           || E1_ENABLE_READ == E_ENABLE_ON
@@ -75,11 +76,12 @@ bool Power::is_power_needed() {
                 || E4_ENABLE_READ == E_ENABLE_ON
                 #if E_STEPPERS > 5
                   || E5_ENABLE_READ == E_ENABLE_ON
-              #endif
+                #endif // E_STEPPERS > 5
-            #endif
+              #endif // E_STEPPERS > 4
-          #endif
+            #endif // E_STEPPERS > 3
-        #endif
+          #endif // E_STEPPERS > 2
-      #endif
+        #endif // E_STEPPERS > 1
+      #endif // E_STEPPERS
   ) return true;
 
   HOTEND_LOOP() if (thermalManager.degTargetHotend(e) > 0) return true;

Marlin/src/gcode/feature/trinamic/M911-M914.cpp

@@ -232,6 +232,7 @@
           #endif
           break;
         case E_AXIS: {
+          #if E_STEPPERS
             const int8_t target_extruder = get_target_extruder_from_command();
             if (target_extruder < 0) return;
             switch (target_extruder) {
@@ -254,6 +255,7 @@
                 case 5: TMC_SET_PWMTHRS_E(5); break;
               #endif
             }
+          #endif // E_STEPPERS
         } break;
       }
     }
@@ -280,7 +282,7 @@
       #if AXIS_HAS_STEALTHCHOP(Z3)
         TMC_SAY_PWMTHRS(Z,Z3);
       #endif
-      #if AXIS_HAS_STEALTHCHOP(E0)
+      #if E_STEPPERS && AXIS_HAS_STEALTHCHOP(E0)
         TMC_SAY_PWMTHRS_E(0);
       #endif
       #if E_STEPPERS > 1 && AXIS_HAS_STEALTHCHOP(E1)

Marlin/src/inc/Conditionals_LCD.h

@@ -370,6 +370,16 @@
  *
  */
 
+#if EXTRUDERS == 0
+  #undef DISTINCT_E_FACTORS
+  #undef SINGLENOZZLE
+  #undef SWITCHING_EXTRUDER
+  #undef SWITCHING_NOZZLE
+  #undef MIXING_EXTRUDER
+  #undef MK2_MULTIPLEXER
+  #undef PRUSA_MMU2
+#endif
+
 #if ENABLED(SWITCHING_EXTRUDER)   // One stepper for every two EXTRUDERS
   #if EXTRUDERS > 4
     #define E_STEPPERS    3

Marlin/src/inc/Conditionals_post.h

@@ -43,6 +43,16 @@
   #define NOT_A_PIN 0 // For PINS_DEBUGGING
 #endif
 
+#if EXTRUDERS == 0
+  #define NO_VOLUMETRICS
+  #undef FWRETRACT
+  #undef LIN_ADVANCE
+  #undef ADVANCED_PAUSE_FEATURE
+  #undef DISABLE_INACTIVE_EXTRUDER
+  #undef EXTRUDER_RUNOUT_PREVENT
+  #undef FILAMENT_LOAD_UNLOAD_GCODES
+#endif
+
 #define HAS_CLASSIC_JERK (IS_KINEMATIC || DISABLED(JUNCTION_DEVIATION))
 
 /**

Marlin/src/lcd/menu/menu_advanced.cpp

@@ -475,7 +475,7 @@ DEFINE_PIDTEMP_FUNCS(0);
           #endif // E_STEPPERS > 4
         #endif // E_STEPPERS > 3
       #endif // E_STEPPERS > 2
-    #else
+    #elif E_STEPPERS
       MENU_MULTIPLIER_ITEM_EDIT(float3, MSG_VMAX MSG_E, &planner.settings.max_feedrate_mm_s[E_AXIS], 1, 999);
     #endif
 
@@ -525,7 +525,7 @@ DEFINE_PIDTEMP_FUNCS(0);
           #endif // E_STEPPERS > 4
         #endif // E_STEPPERS > 3
       #endif // E_STEPPERS > 2
-    #else
+    #elif E_STEPPERS
       MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(long5, MSG_AMAX MSG_E, &planner.settings.max_acceleration_mm_per_s2[E_AXIS], 100, 99000, _reset_acceleration_rates);
     #endif
 
@@ -588,7 +588,7 @@ DEFINE_PIDTEMP_FUNCS(0);
           #endif // E_STEPPERS > 4
         #endif // E_STEPPERS > 3
       #endif // E_STEPPERS > 2
-    #else
+    #elif E_STEPPERS
       MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(float62, MSG_ESTEPS, &planner.settings.axis_steps_per_mm[E_AXIS], 5, 9999, _planner_refresh_positioning);
     #endif
 

Marlin/src/lcd/menu/menu_filament.cpp

@@ -104,6 +104,7 @@ void _menu_temp_filament_op(const AdvancedPauseMode mode, const int8_t extruder)
   MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_PREHEAT_CUSTOM, &thermalManager.target_temperature[_change_filament_temp_extruder], EXTRUDE_MINTEMP, max_temp - 15, _lcd_change_filament_temp_custom_cb);
   END_MENU();
 }
+#if E_STEPPERS
   void menu_temp_e0_filament_change()  { _menu_temp_filament_op(ADVANCED_PAUSE_MODE_PAUSE_PRINT, 0); }
   void menu_temp_e0_filament_load()    { _menu_temp_filament_op(ADVANCED_PAUSE_MODE_LOAD_FILAMENT, 0); }
   void menu_temp_e0_filament_unload()  { _menu_temp_filament_op(ADVANCED_PAUSE_MODE_UNLOAD_FILAMENT, 0); }
@@ -130,6 +131,7 @@ void menu_temp_e0_filament_unload()  { _menu_temp_filament_op(ADVANCED_PAUSE_MOD
       #endif // E_STEPPERS > 3
     #endif // E_STEPPERS > 2
   #endif // E_STEPPERS > 1
+#endif // E_STEPPERS
 
 /**
  *

Marlin/src/lcd/menu/menu_tune.cpp

@@ -43,6 +43,7 @@
 #endif
 
 // Refresh the E factor after changing flow
+#if EXTRUDERS
   void _lcd_refresh_e_factor_0() { planner.refresh_e_factor(0); }
   #if EXTRUDERS > 1
     void _lcd_refresh_e_factor() { planner.refresh_e_factor(active_extruder); }
@@ -60,6 +61,7 @@ void _lcd_refresh_e_factor_0() { planner.refresh_e_factor(0); }
       #endif // EXTRUDERS > 3
     #endif // EXTRUDERS > 2
   #endif // EXTRUDERS > 1
+#endif // EXTRUDERS
 
 #if ENABLED(BABYSTEPPING)
 
@@ -174,7 +176,7 @@ void menu_tune() {
   //
   #if EXTRUDERS == 1
     MENU_ITEM_EDIT_CALLBACK(int3, MSG_FLOW, &planner.flow_percentage[0], 10, 999, _lcd_refresh_e_factor_0);
-  #else // EXTRUDERS > 1
+  #elif EXTRUDERS
     MENU_ITEM_EDIT_CALLBACK(int3, MSG_FLOW, &planner.flow_percentage[active_extruder], 10, 999, _lcd_refresh_e_factor);
     #define EDIT_FLOW(N) MENU_ITEM_EDIT_CALLBACK(int3, MSG_FLOW MSG_LCD_N##N, &planner.flow_percentage[N], 10, 999, _lcd_refresh_e_factor_##N)
     EDIT_FLOW(0);
@@ -191,7 +193,7 @@ void menu_tune() {
         #endif // EXTRUDERS > 4
       #endif // EXTRUDERS > 3
     #endif // EXTRUDERS > 2
-  #endif // EXTRUDERS > 1
+  #endif // EXTRUDERS
 
   //
   // Babystep X:

Marlin/src/module/stepper_indirection.h

@@ -628,8 +628,12 @@ void reset_stepper_drivers();    // Called by settings.load / settings.reset
     #define   NORM_E_DIR(E)   do{ if (E == 0) { E0_DIR_WRITE(!INVERT_E0_DIR); } else { E1_DIR_WRITE(!INVERT_E1_DIR); } }while(0)
     #define    REV_E_DIR(E)   do{ if (E == 0) { E0_DIR_WRITE( INVERT_E0_DIR); } else { E1_DIR_WRITE( INVERT_E1_DIR); } }while(0)
   #endif
-#else
+#elif E_STEPPERS
   #define E_STEP_WRITE(E,V) E0_STEP_WRITE(V)
   #define   NORM_E_DIR(E)   E0_DIR_WRITE(!INVERT_E0_DIR)
   #define    REV_E_DIR(E)   E0_DIR_WRITE( INVERT_E0_DIR)
+#else
+  #define E_STEP_WRITE(E,V) NOOP
+  #define   NORM_E_DIR(E)   NOOP
+  #define    REV_E_DIR(E)   NOOP
 #endif

Marlin/src/pins/sensitive_pins.h

@@ -133,25 +133,28 @@
                  || (ENABLED(SWITCHING_EXTRUDER) && E_STEPPERS > N) \
                  || (DISABLED(SWITCHING_EXTRUDER) && DISABLED(MIXING_EXTRUDER) && EXTRUDERS > N)
 
+#define _E0_CS
+#define _E0_MS1
+#define _E0_MS2
+#define _E0_MS3
+
+#if E_NEEDED(0)
   #if PIN_EXISTS(E0_CS)
+    #undef _E0_CS
     #define _E0_CS E0_CS_PIN,
-#else
-  #define _E0_CS
   #endif
   #if PIN_EXISTS(E0_MS1)
+    #undef _E0_MS1
     #define _E0_MS1 E0_MS1_PIN,
-#else
-  #define _E0_MS1
   #endif
   #if PIN_EXISTS(E0_MS2)
+    #undef _E0_MS2
     #define _E0_MS2 E0_MS2_PIN,
-#else
-  #define _E0_MS2
   #endif
   #if PIN_EXISTS(E0_MS3)
+    #undef _E0_MS3
     #define _E0_MS3 E0_MS3_PIN,
-#else
+  #endif
-  #define _E0_MS3
 #endif
 
 #define _E1_CS
@@ -278,13 +281,18 @@
 // E Steppers
 //
 
-#define _E0_PINS E0_STEP_PIN, E0_DIR_PIN, E0_ENABLE_PIN, _E0_CS _E0_MS1 _E0_MS2 _E0_MS3
+#define _E0_PINS
 #define _E1_PINS
 #define _E2_PINS
 #define _E3_PINS
 #define _E4_PINS
 #define _E5_PINS
 
+#if EXTRUDERS
+  #undef _E0_PINS
+  #define _E0_PINS E0_STEP_PIN, E0_DIR_PIN, E0_ENABLE_PIN, _E0_CS _E0_MS1 _E0_MS2 _E0_MS3
+#endif
+
 #if ENABLED(SWITCHING_EXTRUDER)
                       // Tools 0 and 1 use E0
   #if EXTRUDERS > 2   // Tools 2 and 3 use E1
@@ -320,13 +328,16 @@
 // Heaters, Fans, Temp Sensors
 //
 
-#define _H0_PINS HEATER_0_PIN, E0_AUTO_FAN_PIN, analogInputToDigitalPin(TEMP_0_PIN),
+#define _H0_PINS
 #define _H1_PINS
 #define _H2_PINS
 #define _H3_PINS
 #define _H4_PINS
 #define _H5_PINS
 
+#if HOTENDS
+  #undef _H0_PINS
+  #define _H0_PINS HEATER_0_PIN, E0_AUTO_FAN_PIN, analogInputToDigitalPin(TEMP_0_PIN),
   #if HOTENDS > 1
     #undef _H1_PINS
     #define _H1_PINS HEATER_1_PIN, E1_AUTO_FAN_PIN, analogInputToDigitalPin(TEMP_1_PIN),
@@ -347,6 +358,7 @@
       #endif // HOTENDS > 3
     #endif // HOTENDS > 2
   #endif // HOTENDS > 1
+#endif // HOTENDS
 
 #define _BED_PINS HEATER_BED_PIN, analogInputToDigitalPin(TEMP_BED_PIN),