RGB Caselight (#20341)

Marlin/Configuration.h

   // Use a single NeoPixel LED for static (background) lighting
   //#define NEOPIXEL_BKGD_LED_INDEX  0               // Index of the LED to use
   //#define NEOPIXEL_BKGD_COLOR { 255, 255, 255, 0 } // R, G, B, W
+  //#define NEOPIXEL_BKGD_ALWAYS_ON                  // Keep the backlight on when other NeoPixels are off
 #endif
 
 /**

Marlin/Configuration_adv.h

   #define INVERT_CASE_LIGHT false             // Set true if Case Light is ON when pin is LOW
   #define CASE_LIGHT_DEFAULT_ON true          // Set default power-up state on
   #define CASE_LIGHT_DEFAULT_BRIGHTNESS 105   // Set default power-up brightness (0-255, requires PWM pin)
+  //#define CASE_LIGHT_NO_BRIGHTNESS          // Disable brightness control. Enable for non-PWM lighting.
   //#define CASE_LIGHT_MAX_PWM 128            // Limit PWM duty cycle (0-255)
   //#define CASE_LIGHT_MENU                   // Add Case Light options to the LCD menu
-  //#define CASE_LIGHT_NO_BRIGHTNESS          // Disable brightness control. Enable for non-PWM lighting.
-  //#define CASE_LIGHT_USE_NEOPIXEL           // Use NeoPixel LED as case light, requires NEOPIXEL_LED.
-  #if ENABLED(CASE_LIGHT_USE_NEOPIXEL)
-    #define CASE_LIGHT_NEOPIXEL_COLOR { 255, 255, 255, 255 } // { Red, Green, Blue, White }
+  #if ENABLED(NEOPIXEL_LED)
+    //#define CASE_LIGHT_USE_NEOPIXEL         // Use NeoPixel LED as case light
+  #endif
+  #if EITHER(RGB_LED, RGBW_LED)
+    //#define CASE_LIGHT_USE_RGB_LED          // Use RGB / RGBW LED as case light
+  #endif
+  #if EITHER(CASE_LIGHT_USE_NEOPIXEL, CASE_LIGHT_USE_RGB_LED)
+    #define CASE_LIGHT_DEFAULT_COLOR { 255, 255, 255, 255 } // { Red, Green, Blue, White }
   #endif
 #endif
 

Marlin/src/MarlinCore.cpp

   #endif
 
   #if ENABLED(CASE_LIGHT_ENABLE)
-    #if DISABLED(CASE_LIGHT_USE_NEOPIXEL)
-      if (PWM_PIN(CASE_LIGHT_PIN)) SET_PWM(CASE_LIGHT_PIN); else SET_OUTPUT(CASE_LIGHT_PIN);
-    #endif
-    SETUP_RUN(caselight.update_brightness());
+    SETUP_RUN(caselight.init());
   #endif
 
   #if HAS_PRUSA_MMU1

Marlin/src/feature/caselight.cpp

 
 CaseLight caselight;
 
+#if CASE_LIGHT_IS_COLOR_LED
+  #include "leds/leds.h"
+#endif
+
 #if CASELIGHT_USES_BRIGHTNESS && !defined(CASE_LIGHT_DEFAULT_BRIGHTNESS)
   #define CASE_LIGHT_DEFAULT_BRIGHTNESS 0 // For use on PWM pin as non-PWM just sets a default
 #endif
 
 bool CaseLight::on = CASE_LIGHT_DEFAULT_ON;
 
-#if ENABLED(CASE_LIGHT_USE_NEOPIXEL)
+#if CASE_LIGHT_IS_COLOR_LED
   LEDColor CaseLight::color =
-    #ifdef CASE_LIGHT_NEOPIXEL_COLOR
-      CASE_LIGHT_NEOPIXEL_COLOR
+    #ifdef CASE_LIGHT_DEFAULT_COLOR
+      CASE_LIGHT_DEFAULT_COLOR
     #else
       { 255, 255, 255, 255 }
     #endif
     const uint8_t i = on ? brightness : 0, n10ct = INVERT_CASE_LIGHT ? 255 - i : i;
   #endif
 
-  #if ENABLED(CASE_LIGHT_USE_NEOPIXEL)
+  #if CASE_LIGHT_IS_COLOR_LED
 
     leds.set_color(
       MakeLEDColor(color.r, color.g, color.b, color.w, n10ct),
       false
     );
 
-  #else // !CASE_LIGHT_USE_NEOPIXEL
+  #else // !CASE_LIGHT_IS_COLOR_LED
 
     #if CASELIGHT_USES_BRIGHTNESS
-      if (PWM_PIN(CASE_LIGHT_PIN))
+      if (pin_is_pwm())
         analogWrite(pin_t(CASE_LIGHT_PIN), (
           #if CASE_LIGHT_MAX_PWM == 255
             n10ct
         WRITE(CASE_LIGHT_PIN, s ? HIGH : LOW);
       }
 
-  #endif // !CASE_LIGHT_USE_NEOPIXEL
+  #endif // !CASE_LIGHT_IS_COLOR_LED
+
+  #if ENABLED(CASE_LIGHT_USE_RGB_LED)
+    if (leds.lights_on) leds.update(); else leds.set_off();
+  #endif
 }
 
 #endif // CASE_LIGHT_ENABLE

Marlin/src/feature/caselight.h

  */
 #pragma once
 
-#include "../inc/MarlinConfigPre.h"
+#include "../inc/MarlinConfig.h"
 
-#if ENABLED(CASE_LIGHT_USE_NEOPIXEL)
-  #include "leds/leds.h"
+#if CASE_LIGHT_IS_COLOR_LED
+  #include "leds/leds.h" // for LEDColor
 #endif
 
 #if DISABLED(CASE_LIGHT_NO_BRIGHTNESS) || ENABLED(CASE_LIGHT_USE_NEOPIXEL)
 
 class CaseLight {
 public:
-  #if CASELIGHT_USES_BRIGHTNESS
-    static uint8_t brightness;
-  #endif
   static bool on;
+  TERN_(CASELIGHT_USES_BRIGHTNESS, static uint8_t brightness);
+
+  static bool pin_is_pwm() { return TERN0(NEED_CASE_LIGHT_PIN, PWM_PIN(CASE_LIGHT_PIN)); }
+  static bool has_brightness() { return TERN0(CASELIGHT_USES_BRIGHTNESS, TERN(CASE_LIGHT_USE_NEOPIXEL, true, pin_is_pwm())); }
+
+  static void init() {
+    #if NEED_CASE_LIGHT_PIN
+      if (pin_is_pwm()) SET_PWM(CASE_LIGHT_PIN); else SET_OUTPUT(CASE_LIGHT_PIN);
+    #endif
+    update_brightness();
+  }
 
   static void update(const bool sflag);
   static inline void update_brightness() { update(false); }
-  static inline void update_enabled() { update(true); }
+  static inline void update_enabled()    { update(true);  }
 
 private:
-  #if ENABLED(CASE_LIGHT_USE_NEOPIXEL)
-    static LEDColor color;
-  #endif
+  TERN_(CASE_LIGHT_IS_COLOR_LED, static LEDColor color);
 };
 
 extern CaseLight caselight;

Marlin/src/feature/leds/leds.cpp

   #include "pca9533.h"
 #endif
 
+#if ENABLED(CASE_LIGHT_USE_RGB_LED)
+  #include "../../feature/caselight.h"
+#endif
+
 #if ENABLED(LED_COLOR_PRESETS)
   const LEDColor LEDLights::defaultLEDColor = MakeLEDColor(
     LED_USER_PRESET_RED, LED_USER_PRESET_GREEN, LED_USER_PRESET_BLUE,
 
     #ifdef NEOPIXEL_BKGD_LED_INDEX
       if (NEOPIXEL_BKGD_LED_INDEX == nextLed) {
-        if (++nextLed >= neo.pixels()) nextLed = 0;
-        return;
+        neo.set_color_background();
+        if (++nextLed >= neo.pixels()) {
+          nextLed = 0;
+          return;
+        }
       }
     #endif
 
 
     // This variant uses 3-4 separate pins for the RGB(W) components.
     // If the pins can do PWM then their intensity will be set.
-    #define UPDATE_RGBW(C,c) do {                       \
-      if (PWM_PIN(RGB_LED_##C##_PIN))                   \
-        analogWrite(pin_t(RGB_LED_##C##_PIN), incol.c); \
-      else                                              \
-        WRITE(RGB_LED_##C##_PIN, incol.c ? HIGH : LOW); \
+    #define _UPDATE_RGBW(C,c) do {                \
+      if (PWM_PIN(RGB_LED_##C##_PIN))             \
+        analogWrite(pin_t(RGB_LED_##C##_PIN), c); \
+      else                                        \
+        WRITE(RGB_LED_##C##_PIN, c ? HIGH : LOW); \
     }while(0)
+    #define UPDATE_RGBW(C,c) _UPDATE_RGBW(C, TERN1(CASE_LIGHT_USE_RGB_LED, caselight.on) ? incol.c : 0)
     UPDATE_RGBW(R,r); UPDATE_RGBW(G,g); UPDATE_RGBW(B,b);
     #if ENABLED(RGBW_LED)
       UPDATE_RGBW(W,w);

Marlin/src/feature/leds/leds.h

 
   #if ENABLED(LED_CONTROL_MENU)
     static void toggle();  // swap "off" with color
+  #endif
+  #if EITHER(LED_CONTROL_MENU, CASE_LIGHT_USE_RGB_LED)
     static inline void update() { set_color(color); }
   #endif
 

Marlin/src/feature/leds/neopixel.cpp

   else {
     for (uint16_t i = 0; i < pixels(); ++i) {
       #ifdef NEOPIXEL_BKGD_LED_INDEX
-        if (i == NEOPIXEL_BKGD_LED_INDEX && color != 0x000000) {
+        if (i == NEOPIXEL_BKGD_LED_INDEX && TERN(ENABLED(NEOPIXEL_BKGD_ALWAYS_ON), true, color != 0x000000)) {
           set_color_background();
           continue;
         }

Marlin/src/gcode/host/M115.cpp

 
     // TOGGLE_LIGHTS (M355)
     cap_line(PSTR("TOGGLE_LIGHTS"), ENABLED(CASE_LIGHT_ENABLE));
-    cap_line(PSTR("CASE_LIGHT_BRIGHTNESS"), TERN0(CASE_LIGHT_ENABLE, TERN0(CASELIGHT_USES_BRIGHTNESS, TERN(CASE_LIGHT_USE_NEOPIXEL, true, PWM_PIN(CASE_LIGHT_PIN)))));
+    cap_line(PSTR("CASE_LIGHT_BRIGHTNESS"), TERN0(CASE_LIGHT_ENABLE, caselight.has_brightness()));
 
     // EMERGENCY_PARSER (M108, M112, M410, M876)
     cap_line(PSTR("EMERGENCY_PARSER"), ENABLED(EMERGENCY_PARSER));

Marlin/src/inc/Conditionals_adv.h

   #define NEED_HEX_PRINT 1
 #endif
 
+// Flags for Case Light having a color property or a single pin
+#if ENABLED(CASE_LIGHT_ENABLE)
+  #if EITHER(CASE_LIGHT_USE_NEOPIXEL, CASE_LIGHT_USE_RGB_LED)
+    #define CASE_LIGHT_IS_COLOR_LED 1
+  #else
+    #define NEED_CASE_LIGHT_PIN 1
+  #endif
+#endif
+
 // Flag whether least_squares_fit.cpp is used
 #if ANY(AUTO_BED_LEVELING_UBL, AUTO_BED_LEVELING_LINEAR, Z_STEPPER_ALIGN_KNOWN_STEPPER_POSITIONS)
   #define NEED_LSF 1

Marlin/src/inc/SanityCheck.h

   #error "DUAL_NOZZLE_DUPLICATION_MODE is now MULTI_NOZZLE_DUPLICATION."
 #elif defined(MENU_ITEM_CASE_LIGHT)
   #error "MENU_ITEM_CASE_LIGHT is now CASE_LIGHT_MENU."
+#elif defined(CASE_LIGHT_NEOPIXEL_COLOR)
+  #error "CASE_LIGHT_NEOPIXEL_COLOR is now CASE_LIGHT_DEFAULT_COLOR."
 #elif defined(ABORT_ON_ENDSTOP_HIT_FEATURE_ENABLED)
   #error "ABORT_ON_ENDSTOP_HIT_FEATURE_ENABLED is now SD_ABORT_ON_ENDSTOP_HIT."
 #elif defined(LPC_SD_LCD) || defined(LPC_SD_ONBOARD) || defined(LPC_SD_CUSTOM_CABLE)
 /**
  * Case Light requirements
  */
-#if ENABLED(CASE_LIGHT_ENABLE)
+#if NEED_CASE_LIGHT_PIN
   #if !PIN_EXISTS(CASE_LIGHT)
-    #error "CASE_LIGHT_ENABLE requires CASE_LIGHT_PIN to be defined."
+    #error "CASE_LIGHT_ENABLE requires CASE_LIGHT_PIN, CASE_LIGHT_USE_NEOPIXEL, or CASE_LIGHT_USE_RGB_LED."
   #elif CASE_LIGHT_PIN == FAN_PIN
     #error "CASE_LIGHT_PIN conflicts with FAN_PIN. Resolve before continuing."
   #endif

Marlin/src/lcd/menu/menu_led.cpp

 #if ENABLED(CASE_LIGHT_MENU)
   #include "../../feature/caselight.h"
 
+  #define CASELIGHT_TOGGLE_ITEM() EDIT_ITEM(bool, MSG_CASE_LIGHT, (bool*)&caselight.on, caselight.update_enabled)
+
   #if CASELIGHT_USES_BRIGHTNESS
     void menu_case_light() {
       START_MENU();
       BACK_ITEM(MSG_CONFIGURATION);
       EDIT_ITEM(percent, MSG_CASE_LIGHT_BRIGHTNESS, &caselight.brightness, 0, 255, caselight.update_brightness, true);
-      EDIT_ITEM(bool, MSG_CASE_LIGHT, (bool*)&caselight.on, caselight.update_enabled);
+      CASELIGHT_TOGGLE_ITEM();
       END_MENU();
     }
   #endif
   // Set Case light on/off/brightness
   //
   #if ENABLED(CASE_LIGHT_MENU)
-    #if DISABLED(CASE_LIGHT_NO_BRIGHTNESS)
-      if (TERN1(CASE_LIGHT_USE_NEOPIXEL, PWM_PIN(CASE_LIGHT_PIN)))
+    #if CASELIGHT_USES_BRIGHTNESS
+      if (caselight.has_brightness())
         SUBMENU(MSG_CASE_LIGHT, menu_case_light);
       else
     #endif
-        EDIT_ITEM(bool, MSG_CASE_LIGHT, (bool*)&caselight.on, caselight.update_enabled);
+        CASELIGHT_TOGGLE_ITEM();
   #endif
+
   END_MENU();
 }
 

Marlin/src/pins/pins_postprocess.h

   #undef BOARD_ST7920_DELAY_3
 #endif
 
+#if !NEED_CASE_LIGHT_PIN
+  #undef CASE_LIGHT_PIN
+#endif
+
 #undef HAS_FREE_AUX2_PINS
 #undef DIAG_REMAPPED

buildroot/tests/DUE-tests

            ASSISTED_TRAMMING ASSISTED_TRAMMING_WIZARD REPORT_TRAMMING_MM ASSISTED_TRAMMING_WAIT_POSITION \
            EEPROM_SETTINGS SDSUPPORT BINARY_FILE_TRANSFER \
            BLINKM PCA9533 PCA9632 RGB_LED RGB_LED_R_PIN RGB_LED_G_PIN RGB_LED_B_PIN LED_CONTROL_MENU \
-           NEOPIXEL_LED CASE_LIGHT_ENABLE CASE_LIGHT_USE_NEOPIXEL CASE_LIGHT_MENU \
+           NEOPIXEL_LED CASE_LIGHT_ENABLE CASE_LIGHT_USE_NEOPIXEL CASE_LIGHT_USE_RGB_LED CASE_LIGHT_MENU \
            NOZZLE_PARK_FEATURE ADVANCED_PAUSE_FEATURE FILAMENT_RUNOUT_DISTANCE_MM FILAMENT_RUNOUT_SENSOR \
            AUTO_BED_LEVELING_BILINEAR Z_MIN_PROBE_REPEATABILITY_TEST DEBUG_LEVELING_FEATURE \
            SKEW_CORRECTION SKEW_CORRECTION_FOR_Z SKEW_CORRECTION_GCODE CALIBRATION_GCODE \