🩺 Assert FAN_SOFT_PWM where required (#23383)

Marlin/src/inc/SanityCheck.h

   #endif
 #endif
 
-#if HAS_FAN0 && CONTROLLER_FAN_PIN == FAN_PIN
-  #error "You cannot set CONTROLLER_FAN_PIN equal to FAN_PIN."
+#if HAS_FAN0
+  #if CONTROLLER_FAN_PIN == FAN_PIN
+    #error "You cannot set CONTROLLER_FAN_PIN equal to FAN_PIN."
+  #elif ENABLED(FAN_SOFT_PWM_REQUIRED) && DISABLED(FAN_SOFT_PWM)
+    #error "FAN_SOFT_PWM is required. Enable it to continue."
+  #endif
 #endif
 
 #if ENABLED(USE_CONTROLLER_FAN)

Marlin/src/pins/mega/pins_MEGACONTROLLER.h

   #define CONTROLLER_FAN_PIN            FAN2_PIN
 #endif
 
-#define FAN_SOFT_PWM
+#define FAN_SOFT_PWM_REQUIRED
 
 //
 // Misc. Functions

Marlin/src/pins/stm32f1/pins_BEAST.h

   #define FAN_PIN                           PB10
 #endif
 
-#define FAN_SOFT_PWM
+#define FAN_SOFT_PWM_REQUIRED
 
 //
 // Temperature Sensors

Marlin/src/pins/stm32f1/pins_BTT_SKR_CR6.h

 #define HEATER_BED_PIN                      PC9   // HOT BED
 
 #define FAN_PIN                             PC6   // FAN
-#define FAN_SOFT_PWM
+#define FAN_SOFT_PWM_REQUIRED
 
 #define CONTROLLER_FAN_PIN                  PC7
 

Marlin/src/pins/stm32f1/pins_CHITU3D.h

   #define FAN_PIN                           PG14  // MAIN BOARD FAN
 #endif
 
-#define FAN_SOFT_PWM
+#define FAN_SOFT_PWM_REQUIRED
 
 //
 // Temperature Sensors

Marlin/src/pins/stm32f1/pins_CREALITY_V4.h

 #ifndef FAN_PIN
   #define FAN_PIN                           PA0   // FAN
 #endif
-#if PIN_EXISTS(FAN)
-  #define FAN_SOFT_PWM
-#endif
+#define FAN_SOFT_PWM_REQUIRED
 
 //
 // SD Card

Marlin/src/pins/stm32f1/pins_CREALITY_V4210.h

 #define HEATER_BED_PIN                      PA1   // HOT BED
 
 #define FAN_PIN                             PA2   // FAN
-#define FAN_SOFT_PWM
+#define FAN_SOFT_PWM_REQUIRED
 
 //
 // SD Card

Marlin/src/pins/stm32f1/pins_CREALITY_V45x.h

 // Heaters / Fans
 //
 
-#define FAN_SOFT_PWM
+#define FAN_SOFT_PWM_REQUIRED
 
 //
 // SD Card

Marlin/src/pins/stm32f1/pins_ERYONE_ERY32_MINI.h

 //#define DISABLE_DEBUG
 #define DISABLE_JTAG
 //#define ENABLE_SPI3
-#define FLASH_EEPROM_EMULATION
-#define FAN_SOFT_PWM
 
-#if ENABLED(FLASH_EEPROM_EMULATION)
+#if EITHER(NO_EEPROM_SELECTED, FLASH_EEPROM_EMULATION)
+  #define FLASH_EEPROM_EMULATION
   #define EEPROM_PAGE_SIZE     (0x800U)           // 2KB
   #define EEPROM_START_ADDRESS (0x8000000UL + (STM32_FLASH_SIZE) * 1024UL - (EEPROM_PAGE_SIZE) * 2UL)
   #define MARLIN_EEPROM_SIZE (EEPROM_PAGE_SIZE)
   #endif
 #endif
 
+#define FAN_SOFT_PWM_REQUIRED
+
 //
 // Misc. Functions
 //

Marlin/src/pins/stm32f1/pins_FLY_MINI.h

 //
 // Flash EEPROM Emulation
 //
-#define FLASH_EEPROM_EMULATION
-#define EEPROM_PAGE_SIZE     0x800 // 2KB
-#define EEPROM_START_ADDRESS (0x8000000 + 256 * 1024 - 2 * EEPROM_PAGE_SIZE) // 256K firmware space
-#define MARLIN_EEPROM_SIZE   EEPROM_PAGE_SIZE
+#if EITHER(NO_EEPROM_SELECTED, FLASH_EEPROM_EMULATION)
+  #define FLASH_EEPROM_EMULATION
+  #define EEPROM_PAGE_SIZE     0x800 // 2KB
+  #define EEPROM_START_ADDRESS (0x8000000 + 256 * 1024 - 2 * EEPROM_PAGE_SIZE) // 256K firmware space
+  #define MARLIN_EEPROM_SIZE   EEPROM_PAGE_SIZE
+#endif
 
 //
 // Servos

Marlin/src/pins/stm32f1/pins_LONGER3D_LK.h

 
 #define FAN_PIN                             PA15  // pin 77 (4cm Fan)
 #ifdef MAPLE_STM32F1
-  #define FAN_SOFT_PWM                            // Required to avoid issues with heating or STLink
-  #define FAN_MIN_PWM                         35  // Fan will not start in 1-30 range
-  #define FAN_MAX_PWM                        255
+  #define FAN_SOFT_PWM_REQUIRED
+  #if ENABLED(FAN_SOFT_PWM) && FAN_MIN_PWM < 35   // Required to avoid issues with heating or STLink
+    #error "FAN_MIN_PWM must be 35 or higher."    // Fan will not start in 1-30 range
+  #endif
+#elif ENABLED(FAST_PWM_FAN)
+  #if FAST_PWM_FAN_FREQUENCY != 31400             // Default 1000 is noisy, max 65K (uint16)
+    #error "FAST_PWM_FAN_FREQUENCY must be set to 31400."
+  #endif
+  #if FAN_MIN_PWM < 5
+    #error "FAN_MIN_PWM must be 5 or higher."
+  #endif
 #else
-  #define FAST_PWM_FAN                            // STM32 Variant allow TIMER2 Hardware PWM
-  #define FAN_MIN_PWM                          5
-  #define FAN_MAX_PWM                        255
+  #error "FAST_PWM_FAN required to allow TIMER2 Hardware PWM."
 #endif
 
 //#define BEEPER_PIN                        PD13  // pin 60 (Servo PWM output 5V/GND on Board V0G+) made for BL-Touch sensor

Marlin/src/pins/stm32f1/pins_STM3R_MINI.h

 #endif
 #define FAN1_PIN                            PD13
 
-#define FAN_SOFT_PWM
+#define FAN_SOFT_PWM_REQUIRED
 
 //
 // Temperature Sensors

Marlin/src/pins/stm32f1/pins_TRIGORILLA_PRO.h

 //
 // EEPROM
 //
-#define FLASH_EEPROM_EMULATION
+#if NO_EEPROM_SELECTED
+  #define FLASH_EEPROM_EMULATION
+#endif
 #if ENABLED(FLASH_EEPROM_EMULATION)
   // SoC Flash (framework-arduinoststm32-maple/STM32F1/libraries/EEPROM/EEPROM.h)
   #define EEPROM_START_ADDRESS (0x8000000UL + (512 * 1024) - 2 * EEPROM_PAGE_SIZE)

Marlin/src/pins/stm32f4/pins_ARTILLERY_RUBY.h

 
 #define BOARD_INFO_NAME      "Artillery Ruby"
 
-#define FLASH_EEPROM_EMULATION
-//#define I2C_EEPROM
+#if NO_EEPROM_SELECTED
+  #define FLASH_EEPROM_EMULATION
+  //#define I2C_EEPROM
+#endif
 //#define E2END                            0xFFF  // 4KB
 
 #define HAL_TIMER_RATE                     F_CPU

Marlin/src/pins/stm32f4/pins_INDEX_REV03.h

 #define FAN2_PIN                            PE4
 #define FAN3_PIN                            PE5
 
-#define FAN_SOFT_PWM
+#define FAN_SOFT_PWM_REQUIRED
 
 // Neopixel Rings
 #define NEOPIXEL_PIN                        PC7

Marlin/src/pins/stm32f4/pins_RUMBA32_common.h

 
 // Use soft PWM for fans - PWM is not working properly when paired with STM32 Arduino Core v1.7.0
 // This can be removed when Core version is updated and PWM behaviour is fixed.
-#define FAN_SOFT_PWM
+#define FAN_SOFT_PWM_REQUIRED
 
 //
 // Configure Timers

buildroot/tests/STM32F103RET6_creality

 restore_configs
 opt_set MOTHERBOARD BOARD_CREALITY_V452 SERIAL_PORT 1
 opt_disable NOZZLE_TO_PROBE_OFFSET
-opt_enable NOZZLE_AS_PROBE Z_SAFE_HOMING Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN \
+opt_enable NOZZLE_AS_PROBE Z_SAFE_HOMING Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN FAN_SOFT_PWM \
            PROBE_ACTIVATION_SWITCH PROBE_TARE PROBE_TARE_ONLY_WHILE_INACTIVE
 exec_test $1 $2 "Creality V4.5.2 PROBE_ACTIVATION_SWITCH, Probe Tare" "$3"
 

buildroot/tests/STM32F103RE_btt_USB

 
 restore_configs
 opt_set MOTHERBOARD BOARD_BTT_SKR_CR6 SERIAL_PORT -1 SERIAL_PORT_2 2 TEMP_SENSOR_BED 1
-opt_enable CR10_STOCKDISPLAY \
+opt_enable CR10_STOCKDISPLAY FAN_SOFT_PWM \
            NOZZLE_AS_PROBE Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN Z_SAFE_HOMING \
            PROBE_ACTIVATION_SWITCH PROBE_TARE PROBE_TARE_ONLY_WHILE_INACTIVE \
            PROBING_HEATERS_OFF PREHEAT_BEFORE_PROBING

buildroot/tests/rumba32

 opt_set MOTHERBOARD BOARD_RUMBA32_V1_0 SERIAL_PORT -1 \
         TEMP_SENSOR_BED 1 X_DRIVER_TYPE TMC2130
 opt_disable PIDTEMP
-opt_enable PIDTEMPBED
+opt_enable PIDTEMPBED FAN_SOFT_PWM
 opt_disable THERMAL_PROTECTION_BED
 exec_test $1 $2 "RUMBA32 V1.0 with TMC2130, PID Bed, and bed thermal protection disabled" "$3"
 
 restore_configs
 opt_set MOTHERBOARD BOARD_RUMBA32_V1_1 SERIAL_PORT -1 \
         TEMP_SENSOR_BED 1 X_DRIVER_TYPE TMC2130 Y_DRIVER_TYPE TMC2208
-opt_enable PIDTEMPBED EEPROM_SETTINGS EEPROM_CHITCHAT REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+opt_enable PIDTEMPBED FAN_SOFT_PWM EEPROM_SETTINGS EEPROM_CHITCHAT REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
 exec_test $1 $2 "RUMBA32 V1.1 with TMC2130, TMC2208, PID Bed, EEPROM settings, and graphic LCD controller" "$3"
 
 # Build examples
 restore_configs
 opt_set MOTHERBOARD BOARD_RUMBA32_MKS SERIAL_PORT -1 X_DRIVER_TYPE TMC2130 Y_DRIVER_TYPE TMC2208
+opt_enable FAN_SOFT_PWM
 exec_test $1 $2 "RUMBA32 MKS Default Config with Mixed TMC Drivers" "$3"
 
 # cleanup