copied file changes from PR #5685

==============================

Configuration_adv.h changes

==============================

add "live" LCD update

==============================

P & S version

==============================

final (hopefully) tested version

==============================

update M115 capabilities print

==============================

Menu changes portion of the requested changes

==============================

changed USEABLE_HARDWARE_PWM from a function to a series of macros

==============================

changes per review

Marlin/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/Marlin_main.cpp

  * M304 - Set bed PID parameters P I and D. (Requires PIDTEMPBED)
  * M350 - Set microstepping mode. (Requires digital microstepping pins.)
  * M351 - Toggle MS1 MS2 pins directly. (Requires digital microstepping pins.)
- * M355 - Turn the Case Light on/off and set its brightness. (Requires CASE_LIGHT_PIN)
+ * M355 - Set Case Light on/off and set brightness. (Requires CASE_LIGHT_PIN)
  * M380 - Activate solenoid on active extruder. (Requires EXT_SOLENOID)
  * M381 - Disable all solenoids. (Requires EXT_SOLENOID)
  * M400 - Finish all moves.
   ;
 #endif
 
-#if HAS_CASE_LIGHT
-  bool case_light_on =
-    #if ENABLED(CASE_LIGHT_DEFAULT_ON)
-      true
-    #else
-      false
-    #endif
-  ;
-#endif
-
 #if ENABLED(DELTA)
 
   float delta[ABC],
     SERIAL_ECHOPAIR(", ", z);
     SERIAL_CHAR(')');
 
-    suffix ? serialprintPGM(suffix) : SERIAL_EOL;
+    if (suffix) {serialprintPGM(suffix);}  //won't compile for Teensy with the previous construction
+    else SERIAL_EOL;
   }
 
   void print_xyz(const char* prefix, const char* suffix, const float xyz[]) {
 
           recalc_delta_settings(delta_radius, delta_diagonal_rod);
         }
-        else if(zero_std_dev >= test_precision) {   // step one back
+        else if (zero_std_dev >= test_precision) {   // step one back
           COPY(endstop_adj, e_old);
           delta_radius = dr_old;
           home_offset[Z_AXIS] = zh_old;
       SERIAL_PROTOCOLLNPGM("Cap:SOFTWARE_POWER:0");
     #endif
 
-    // TOGGLE_LIGHTS (M355)
+    // CASE LIGHTS (M355)
     #if HAS_CASE_LIGHT
       SERIAL_PROTOCOLLNPGM("Cap:TOGGLE_LIGHTS:1");
+      bool USEABLE_HARDWARE_PWM(uint8_t pin);
+      if (USEABLE_HARDWARE_PWM(CASE_LIGHT_PIN)) {
+        SERIAL_PROTOCOLLNPGM("Cap:CASE_LIGHT_BRIGHTNESS:1");
+      }
+      else
+        SERIAL_PROTOCOLLNPGM("Cap:CASE_LIGHT_BRIGHTNESS:0");
     #else
       SERIAL_PROTOCOLLNPGM("Cap:TOGGLE_LIGHTS:0");
+      SERIAL_PROTOCOLLNPGM("Cap:CASE_LIGHT_BRIGHTNESS:0");
     #endif
 
     // EMERGENCY_PARSER (M108, M112, M410)
 #endif // HAS_MICROSTEPS
 
 #if HAS_CASE_LIGHT
-
-  uint8_t case_light_brightness = 255;
+  #ifndef INVERT_CASE_LIGHT
+    #define INVERT_CASE_LIGHT false
+  #endif
+  int case_light_brightness;  // LCD routine wants INT
+  bool case_light_on;
 
   void update_case_light() {
-    WRITE(CASE_LIGHT_PIN, case_light_on != INVERT_CASE_LIGHT ? HIGH : LOW);
-    analogWrite(CASE_LIGHT_PIN, case_light_on != INVERT_CASE_LIGHT ? case_light_brightness : 0);
+    pinMode(CASE_LIGHT_PIN, OUTPUT); // digitalWrite doesn't set the port mode
+    uint8_t case_light_bright = (uint8_t)case_light_brightness;
+    if (case_light_on) {
+      if (USEABLE_HARDWARE_PWM(CASE_LIGHT_PIN)) {
+        analogWrite(CASE_LIGHT_PIN, INVERT_CASE_LIGHT ? 255 - case_light_brightness : case_light_brightness );
+      }
+      else digitalWrite(CASE_LIGHT_PIN, INVERT_CASE_LIGHT ? LOW : HIGH );
+    }
+    else digitalWrite(CASE_LIGHT_PIN, INVERT_CASE_LIGHT ? HIGH : LOW);
   }
-
 #endif // HAS_CASE_LIGHT
 
 /**
- * M355: Turn case lights on/off and set brightness
+ * M355: Turn case light on/off and set brightness
+ *
+ *   P<byte>  Set case light brightness (PWM pin required - ignored otherwise)
+ *
+ *   S<bool>  Set case light on/off
+ *
+ *   When S turns on the light on a PWM pin then the current brightness level is used/restored
  *
- *   S<bool>  Turn case light on or off
- *   P<byte>  Set case light brightness (PWM pin required)
+ *   M355 P200 S0 turns off the light & sets the brightness level
+ *   M355 S1 turns on the light with a brightness of 200 (assuming a PWM pin)
  */
 inline void gcode_M355() {
   #if HAS_CASE_LIGHT
-    if (parser.seen('P')) case_light_brightness = parser.value_byte();
-    if (parser.seen('S')) case_light_on = parser.value_bool();
-    update_case_light();
+    uint8_t args = 0;
+    if (parser.seen('P')) ++args, case_light_brightness = parser.value_byte();
+    if (parser.seen('S')) ++args, case_light_on = parser.value_bool(); 
+    if (args) update_case_light();
+
+    // always report case light status
     SERIAL_ECHO_START;
-    SERIAL_ECHOPGM("Case lights ");
-    case_light_on ? SERIAL_ECHOLNPGM("on") : SERIAL_ECHOLNPGM("off");
+    if (!case_light_on) {
+      SERIAL_ECHOLN("Case light: off");
+    }
+    else {
+      if (!USEABLE_HARDWARE_PWM(CASE_LIGHT_PIN)) SERIAL_ECHOLN("Case light: on");
+      else SERIAL_ECHOLNPAIR("Case light: ", case_light_brightness);
+    }
+
   #else
     SERIAL_ERROR_START;
     SERIAL_ERRORLNPGM(MSG_ERR_M355_NONE);
 
       #endif // HAS_MICROSTEPS
 
-      case 355: // M355 Turn case lights on/off
+      case 355: // M355 set case light brightness
         gcode_M355();
         break;
 
   #endif
 
   #if HAS_CASE_LIGHT
+    case_light_on = CASE_LIGHT_DEFAULT_ON;
+    case_light_brightness = CASE_LIGHT_DEFAULT_BRIGHTNESS;
     update_case_light();
   #endif
 

Marlin/example_configurations/Cartesio/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 35
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/Felix/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/FolgerTech-i3-2020/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/Hephestos/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/Hephestos_2/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/K8200/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/K8400/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/RigidBot/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/SCARA/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/TAZ4/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/TinyBoy2/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/WITBOX/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/delta/generic/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/gCreate_gMax1.5+/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/makibox/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/example_configurations/wt150/Configuration_adv.h

 #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
 #define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
 
-// Define a pin to turn case light on/off
-//#define CASE_LIGHT_PIN 4
-#if PIN_EXISTS(CASE_LIGHT)
-  #define INVERT_CASE_LIGHT false   // Set to true if HIGH is the OFF state (active low)
-  //#define CASE_LIGHT_DEFAULT_ON   // Uncomment to set default state to on
-  //#define MENU_ITEM_CASE_LIGHT    // Uncomment to have a Case Light On / Off entry in main menu
-#endif
+// M355 Case Light command 
+//   Set case light brightness/on/off
+
+//#define CASE_LIGHT_ENABLE 
+#if ENABLED(CASE_LIGHT_ENABLE) 
+  #define CASE_LIGHT_PIN 4          // can be defined here or in the pins_XXX.h file for your board 
+                                    //  pins_XXX.h file overrides this one 
+  #define INVERT_CASE_LIGHT false             // set to true if case light is ON when pin is at 0 
+  #define CASE_LIGHT_DEFAULT_ON true          // set default power up state to on or off
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // set power up brightness 0-255 ( only used if on PWM
+                                              // and if CASE_LIGHT_DEFAULT is set to on
+  //#define MENU_ITEM_CASE_LIGHT              // Uncomment to have a Case Light entry in main menu 
+#endif 
 
 //===========================================================================
 //============================ Mechanical Settings ==========================

Marlin/fastio.h

  * Contributed by Triffid_Hunter. Modified by Kliment and the Marlin team.
  */
 
-#ifndef _FASTIO_ARDUINO_H 
+#ifndef _FASTIO_ARDUINO_H
 #define _FASTIO_ARDUINO_H
 
 #include <avr/io.h>
+#include "macros.h"
 
 /**
  * Enable this option to use Teensy++ 2.0 assignments for AT90USB processors.
 #define SET_FOCB(T,V) SET_FOC(T,B,V)
 #define SET_FOCC(T,V) SET_FOC(T,C,V)
 
+
+/**
+ * PWM availability macros
+ */
+#define AVR_AT90USB1286_FAMILY (defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1286P__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB646P__)  || defined(__AVR_AT90USB647__))
+#define AVR_ATmega1284_FAMILY (defined(__AVR_ATmega644__) || defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644PA__) || defined(__AVR_ATmega1284P__))
+#define AVR_ATmega2560_FAMILY (defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__))
+#define AVR_ATmega2561_FAMILY (defined(__AVR_ATmega1281__) || defined(__AVR_ATmega2561__))
+#define AVR_ATmega328_FAMILY (defined(__AVR_ATmega168__) || defined(__AVR_ATmega328__) || defined(__AVR_ATmega328p__))
+
+//find out which harware PWMs are already in use
+#if PIN_EXISTS(CONTROLLER_FAN)
+  #define PWM_CHK_FAN_B(p) (p == CONTROLLER_FAN_PIN || p == E0_AUTO_FAN_PIN || p ==  E1_AUTO_FAN_PIN || p ==  E2_AUTO_FAN_PIN || p ==  E3_AUTO_FAN_PIN || p ==  E4_AUTO_FAN_PIN)
+#else
+  #define PWM_CHK_FAN_B(p) (p == E0_AUTO_FAN_PIN || p ==  E1_AUTO_FAN_PIN || p ==  E2_AUTO_FAN_PIN || p ==  E3_AUTO_FAN_PIN || p ==  E4_AUTO_FAN_PIN)
+#endif
+
+#if PIN_EXISTS(FAN) || PIN_EXISTS(FAN1) || PIN_EXISTS(FAN2)
+  #if PIN_EXISTS(FAN2)
+    #define PWM_CHK_FAN_A(p) (p == FAN_PIN || p == FAN1_PIN || p == FAN2_PIN)
+  #elif PIN_EXISTS(FAN1)
+    #define PWM_CHK_FAN_A(p) (p == FAN_PIN || p == FAN1_PIN)
+  #else
+    #define PWM_CHK_FAN_A(p) p == FAN_PIN
+  #endif
+#else
+  #define PWM_CHK_FAN_A(p) false
+#endif
+
+#if HAS_MOTOR_CURRENT_PWM
+  #if PIN_EXISTS(MOTOR_CURRENT_PWM_XY)
+    #define PWM_CHK_MOTOR_CURRENT(p) (p == MOTOR_CURRENT_PWM_E || p == MOTOR_CURRENT_PWM_Z || p == MOTOR_CURRENT_PWM_XY)
+  #elif PIN_EXISTS(MOTOR_CURRENT_PWM_Z)
+    #define PWM_CHK_MOTOR_CURRENT(p) (p == MOTOR_CURRENT_PWM_E || p == MOTOR_CURRENT_PWM_Z)
+  #else
+    #define PWM_CHK_MOTOR_CURRENT(p) (p == MOTOR_CURRENT_PWM_E)
+  #endif
+#else
+  #define PWM_CHK_MOTOR_CURRENT(p) false
+#endif
+
+#if defined(NUM_SERVOS)
+  #if AVR_ATmega2560_FAMILY
+    #define PWM_CHK_SERVO(p) ( p == 5 || NUM_SERVOS > 12 && p == 6 || NUM_SERVOS > 24 && p == 46)  //PWMS 3A, 4A & 5A
+  #elif AVR_ATmega2561_FAMILY
+    #define PWM_CHK_SERVO(p)   p ==  5  //PWM3A
+  #elif AVR_ATmega1284_FAMILY
+    #define PWM_CHK_SERVO(p)   false
+  #elif AVR_AT90USB1286_FAMILY
+    #define PWM_CHK_SERVO(p)   p ==  16 //PWM3A
+  #elif AVR_ATmega328_FAMILY
+    #define PWM_CHK_SERVO(p)   false
+  #endif
+#else
+  #define PWM_CHK_SERVO(p) false
+#endif
+
+#if ENABLED(BARICUDA)
+  #if HAS_HEATER_1 && HAS_HEATER_2
+    #define PWM_CHK_HEATER(p) (p == HEATER_1_PIN || p == HEATER_2_PIN)
+  #elif HAS_HEATER_1
+    #define PWM_CHK_HEATER(p) (p == HEATER_1_PIN)
+  #endif
+#else
+    #define PWM_CHK_HEATER(p) false
+#endif
+
+#define PWM_CHK(p) (PWM_CHK_HEATER(p) || PWM_CHK_SERVO(p)  || PWM_CHK_MOTOR_CURRENT(p)\
+                     || PWM_CHK_FAN_A(p) || PWM_CHK_FAN_B(p))
+
+// define which hardware PWMs are available for the current CPU
+// all timer 1 PWMS deleted from this list because they are never available
+#if AVR_ATmega2560_FAMILY
+  #define PWM_PINS(p)  ((p >= 2 && p <= 10 ) || p ==  13 || p ==  44 || p ==  45 || p ==  46 )
+#elif AVR_ATmega2561_FAMILY
+  #define PWM_PINS(p)  ((p >= 2 && p <= 6 ) || p ==  9)
+#elif AVR_ATmega1284_FAMILY
+  #define PWM_PINS(p)  (p == 3 || p ==  4 || p ==  14 || p ==  15)
+#elif AVR_AT90USB1286_FAMILY
+  #define PWM_PINS(p)  (p == 0 || p ==  1 || p ==  14 || p ==  15 || p ==  16 || p ==  24)
+#elif AVR_ATmega328_FAMILY
+  #define PWM_PINS(p)  (p == 3 || p ==  5 || p ==  6 || p ==  11)
+#else
+  #error "unknown CPU"
+#endif
+
+// finally - the macro that tells us if a pin is an available hardware PWM
+#define USEABLE_HARDWARE_PWM(p) (PWM_PINS(p) && !PWM_CHK(p))
+
 #endif // _FASTIO_ARDUINO_H

Marlin/language_en.h

 #ifndef MSG_CASE_LIGHT
   #define MSG_CASE_LIGHT                      _UxGT("Case light")
 #endif
-
+#ifndef MSG_CASE_LIGHT_BRIGHTNESS
+  #define MSG_CASE_LIGHT_BRIGHTNESS           _UxGT("Light BRIGHTNESS")
+#endif
 #if LCD_WIDTH >= 20
   #ifndef MSG_INFO_PRINT_COUNT
     #define MSG_INFO_PRINT_COUNT              _UxGT("Print Count")

Marlin/ultralcd.cpp

 
 uint8_t lcd_status_message_level;
 char lcd_status_message[3 * (LCD_WIDTH) + 1] = WELCOME_MSG; // worst case is kana with up to 3*LCD_WIDTH+1
+
 #if ENABLED(STATUS_MESSAGE_SCROLLING)
   uint8_t status_scroll_pos = 0;
 #endif
 
   #endif // SDSUPPORT
 
+  #if ENABLED(MENU_ITEM_CASE_LIGHT)
+
+    extern int case_light_brightness;
+    extern bool case_light_on;
+    extern void update_case_light();
+
+    void case_light_menu() {
+      START_MENU();
+      //
+      // ^ Main
+      //
+      MENU_BACK(MSG_MAIN);
+      MENU_ITEM_EDIT_CALLBACK(int3, MSG_CASE_LIGHT_BRIGHTNESS, &case_light_brightness, 0, 255, update_case_light, true);
+      MENU_ITEM_EDIT_CALLBACK(bool, MSG_CASE_LIGHT, (bool*)&case_light_on, update_case_light);
+      END_MENU();
+    }
+  #endif // MENU_ITEM_CASE_LIGHT
+
   #if ENABLED(BLTOUCH)
 
     /**
    *
    */
 
-  #if ENABLED(MENU_ITEM_CASE_LIGHT)
-    extern bool case_light_on;
-    extern void update_case_light();
-  #endif
-
   void lcd_main_menu() {
     START_MENU();
     MENU_BACK(MSG_WATCH);
     #endif
 
     //
-    // Switch case light on/off
+    // Set Case light on/off/brightness
     //
     #if ENABLED(MENU_ITEM_CASE_LIGHT)
-      MENU_ITEM_EDIT_CALLBACK(bool, MSG_CASE_LIGHT, &case_light_on, update_case_light);
+      if (USEABLE_HARDWARE_PWM(CASE_LIGHT_PIN)) {
+        MENU_ITEM(submenu, MSG_CASE_LIGHT, case_light_menu);
+      }
+      else
+        MENU_ITEM_EDIT_CALLBACK(bool, MSG_CASE_LIGHT, (bool*)&case_light_on, update_case_light);
     #endif
 
     if (planner.movesplanned() || IS_SD_PRINTING) {
      */
     void _lcd_ubl_validate_custom_mesh() {
       char UBL_LCD_GCODE[24];
-      const int temp = 
+      const int temp =
         #if WATCH_THE_BED
           custom_bed_temp
         #else
     MENU_ITEM(submenu, MSG_FILAMENT, lcd_control_filament_menu);
 
     #if HAS_LCD_CONTRAST
-      MENU_ITEM_EDIT_CALLBACK(int3, MSG_CONTRAST, &lcd_contrast, LCD_CONTRAST_MIN, LCD_CONTRAST_MAX, lcd_callback_set_contrast, true);
+      MENU_ITEM_EDIT_CALLBACK(int3, MSG_CONTRAST, (int) &lcd_contrast, LCD_CONTRAST_MIN, LCD_CONTRAST_MAX, lcd_callback_set_contrast, true);
     #endif
     #if ENABLED(FWRETRACT)
       MENU_ITEM(submenu, MSG_RETRACT, lcd_control_retract_menu);

Marlin/ultralcd.h

 
   #if ENABLED(DOGLCD)
     extern uint16_t lcd_contrast;
-    void set_lcd_contrast(uint16_t value);
+    void set_lcd_contrast(const uint16_t value);
   #elif ENABLED(SHOW_BOOTSCREEN)
     void bootscreen();
   #endif