1 files changed, 22 insertions, 0 deletions

diff --git a/quantum/rgblight.c b/quantum/rgblight.c
index 625971e0f..52a09817a 100644
--- a/quantum/rgblight.c
+++ b/quantum/rgblight.c
@@ -370,6 +370,7 @@ void rgblight_setrgb(uint8_t r, uint8_t g, uint8_t b) {
   rgblight_set();
 }
 
+__attribute__ ((weak))
 void rgblight_set(void) {
   if (rgblight_config.enable) {
     #ifdef RGBW
@@ -449,6 +450,9 @@ void rgblight_task(void) {
     } else if (rgblight_config.mode >= 21 && rgblight_config.mode <= 23) {
       // mode = 21 to 23, knight mode
       rgblight_effect_knight(rgblight_config.mode - 21);
+    } else {
+      // mode = 24, christmas mode
+      rgblight_effect_christmas();
     }
   }
 }
@@ -594,4 +598,22 @@ void rgblight_effect_knight(uint8_t interval) {
   }
 }
 
+
+void rgblight_effect_christmas(void) {
+  static uint16_t current_offset = 0;
+  static uint16_t last_timer = 0;
+  uint16_t hue;
+  uint8_t i;
+  if (timer_elapsed(last_timer) < 1000) {
+    return;
+  }
+  last_timer = timer_read();
+  current_offset = (current_offset + 1) % 2;
+  for (i = 0; i < RGBLED_NUM; i++) {
+    hue = 0 + ((RGBLED_NUM * (i + current_offset)) % 2) * 80;
+    sethsv(hue, rgblight_config.sat, rgblight_config.val, (LED_TYPE *)&led[i]);
+  }
+  rgblight_set();
+}
+
 #endif