(feat) Allow setting underglow color by key press

app/dts/behaviors/rgb_underglow.dtsi

@@ -9,7 +9,7 @@
 		rgb_ug: behavior_rgb_underglow {
 			compatible = "zmk,behavior-rgb-underglow";
 			label = "RGB_UNDERGLOW";
-			#binding-cells = <1>;
+			#binding-cells = <2>;
 		};
 	};
 };

app/dts/bindings/behaviors/zmk,behavior-rgb-underglow.yaml

@@ -5,4 +5,4 @@ description: RGB Underglow Action
 
 compatible: "zmk,behavior-rgb-underglow"
 
-include: one_param.yaml
+include: two_param.yaml

app/include/dt-bindings/zmk/rgb.h

@@ -4,14 +4,29 @@
  * SPDX-License-Identifier: MIT
  */
 
-#define RGB_TOG 0
-#define RGB_HUI 1
-#define RGB_HUD 2
-#define RGB_SAI 3
-#define RGB_SAD 4
-#define RGB_BRI 5
-#define RGB_BRD 6
-#define RGB_SPI 7
-#define RGB_SPD 8
-#define RGB_EFF 9
-#define RGB_EFR 10
+#define RGB_TOG_CMD 0
+#define RGB_HUI_CMD 1
+#define RGB_HUD_CMD 2
+#define RGB_SAI_CMD 3
+#define RGB_SAD_CMD 4
+#define RGB_BRI_CMD 5
+#define RGB_BRD_CMD 6
+#define RGB_SPI_CMD 7
+#define RGB_SPD_CMD 8
+#define RGB_EFF_CMD 9
+#define RGB_EFR_CMD 10
+#define RGB_COLOR_HSB_CMD 11
+
+#define RGB_TOG RGB_TOG_CMD 0
+#define RGB_HUI RGB_HUI_CMD 0
+#define RGB_HUD RGB_HUD_CMD 0
+#define RGB_SAI RGB_SAI_CMD 0
+#define RGB_SAD RGB_SAD_CMD 0
+#define RGB_BRI RGB_BRI_CMD 0
+#define RGB_BRD RGB_BRD_CMD 0
+#define RGB_SPI RGB_SPI_CMD 0
+#define RGB_SPD RGB_SPD_CMD 0
+#define RGB_EFF RGB_EFF_CMD 0
+#define RGB_EFR RGB_EFR_CMD 0
+#define RGB_COLOR_HSB(h, s, v) RGB_COLOR_HSB_CMD(((h) << 16) + ((s) << 8) + (v))
+#define RGB_COLOR_HSV RGB_COLOR_HSB

app/include/zmk/rgb_underglow.h

@@ -12,3 +12,4 @@ int zmk_rgb_underglow_change_hue(int direction);
 int zmk_rgb_underglow_change_sat(int direction);
 int zmk_rgb_underglow_change_brt(int direction);
 int zmk_rgb_underglow_change_spd(int direction);
+int zmk_rgb_underglow_set_hsb(uint16_t hue, uint8_t saturation, uint8_t brightness);

app/src/behaviors/behavior_rgb_underglow.c

@@ -21,28 +21,31 @@ static int behavior_rgb_underglow_init(const struct device *dev) { return 0; }
 static int on_keymap_binding_pressed(struct zmk_behavior_binding *binding,
                                      struct zmk_behavior_binding_event event) {
     switch (binding->param1) {
-    case RGB_TOG:
+    case RGB_TOG_CMD:
         return zmk_rgb_underglow_toggle();
-    case RGB_HUI:
+    case RGB_HUI_CMD:
         return zmk_rgb_underglow_change_hue(1);
-    case RGB_HUD:
+    case RGB_HUD_CMD:
         return zmk_rgb_underglow_change_hue(-1);
-    case RGB_SAI:
+    case RGB_SAI_CMD:
         return zmk_rgb_underglow_change_sat(1);
-    case RGB_SAD:
+    case RGB_SAD_CMD:
         return zmk_rgb_underglow_change_sat(-1);
-    case RGB_BRI:
+    case RGB_BRI_CMD:
         return zmk_rgb_underglow_change_brt(1);
-    case RGB_BRD:
+    case RGB_BRD_CMD:
         return zmk_rgb_underglow_change_brt(-1);
-    case RGB_SPI:
+    case RGB_SPI_CMD:
         return zmk_rgb_underglow_change_spd(1);
-    case RGB_SPD:
+    case RGB_SPD_CMD:
         return zmk_rgb_underglow_change_spd(-1);
-    case RGB_EFF:
+    case RGB_EFF_CMD:
         return zmk_rgb_underglow_cycle_effect(1);
-    case RGB_EFR:
+    case RGB_EFR_CMD:
         return zmk_rgb_underglow_cycle_effect(-1);
+    case RGB_COLOR_HSB_CMD:
+        return zmk_rgb_underglow_set_hsb((binding->param2 >> 16) & 0xFFFF,
+                                         (binding->param2 >> 8) & 0xFF, binding->param2 & 0xFF);
     }
 
     return -ENOTSUP;

app/src/rgb_underglow.c

@@ -346,6 +346,19 @@ int zmk_rgb_underglow_toggle() {
     return zmk_rgb_underglow_save_state();
 }
 
+int zmk_rgb_underglow_set_hsb(uint16_t hue, uint8_t saturation, uint8_t brightness) {
+    if (hue > 360 || saturation > 100 || brightness > 100) {
+        return -ENOTSUP;
+    }
+
+    state.hue = hue;
+    state.saturation = saturation;
+    state.brightness = brightness;
+    state.current_effect = UNDERGLOW_EFFECT_SOLID;
+
+    return 0;
+}
+
 int zmk_rgb_underglow_change_hue(int direction) {
     if (!led_strip)
         return -ENODEV;