Helix keyboard led test as a keymap (#2513)

* duplicate keyboards/helix/rev2/keymaps/default to keyboards/helix/rev2/keymaps/led_test

* OLED & RGB LED on

* duplicate quantum/rgblight.[ch] to keyboards/helix/rev2/keymaps/led_test

* rgblight.c modify for RGB test

1 files changed, 666 insertions, 0 deletions

diff --git a/keyboards/helix/rev2/keymaps/led_test/rgblight.c b/keyboards/helix/rev2/keymaps/led_test/rgblight.c
new file mode 100644
index 0000000000..fee614db05
--- /dev/null
+++ b/keyboards/helix/rev2/keymaps/led_test/rgblight.c
@@ -0,0 +1,666 @@
+/* Copyright 2016-2017 Yang Liu
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <math.h>
+#include <avr/eeprom.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include "progmem.h"
+#include "timer.h"
+#include "rgblight.h"
+#include "debug.h"
+#include "led_tables.h"
+
+__attribute__ ((weak))
+const uint16_t RGBLED_BREATHING_INTERVALS[] PROGMEM = {1024, 20, 10, 5}; //modify for led_test
+__attribute__ ((weak))
+const uint8_t RGBLED_RAINBOW_MOOD_INTERVALS[] PROGMEM = {120, 60, 30};
+__attribute__ ((weak))
+const uint8_t RGBLED_RAINBOW_SWIRL_INTERVALS[] PROGMEM = {100, 50, 20};
+__attribute__ ((weak))
+const uint8_t RGBLED_SNAKE_INTERVALS[] PROGMEM = {100, 50, 20};
+__attribute__ ((weak))
+const uint8_t RGBLED_KNIGHT_INTERVALS[] PROGMEM = {127, 63, 31};
+__attribute__ ((weak))
+const uint16_t RGBLED_GRADIENT_RANGES[] PROGMEM = {360, 240, 180, 120, 90};
+
+rgblight_config_t rgblight_config;
+rgblight_config_t inmem_config;
+
+LED_TYPE led[RGBLED_NUM];
+uint8_t rgblight_inited = 0;
+bool rgblight_timer_enabled = false;
+
+void sethsv(uint16_t hue, uint8_t sat, uint8_t val, LED_TYPE *led1) {
+  uint8_t r = 0, g = 0, b = 0, base, color;
+
+  #ifdef RGBLIGHT_LIMIT_VAL
+    if (val > RGBLIGHT_LIMIT_VAL) {
+      val=RGBLIGHT_LIMIT_VAL; // limit the val
+    }
+  #endif
+
+  if (sat == 0) { // Acromatic color (gray). Hue doesn't mind.
+    r = val;
+    g = val;
+    b = val;
+  } else {
+    base = ((255 - sat) * val) >> 8;
+    color = (val - base) * (hue % 60) / 60;
+
+    switch (hue / 60) {
+      case 0:
+        r = val;
+        g = base + color;
+        b = base;
+        break;
+      case 1:
+        r = val - color;
+        g = val;
+        b = base;
+        break;
+      case 2:
+        r = base;
+        g = val;
+        b = base + color;
+        break;
+      case 3:
+        r = base;
+        g = val - color;
+        b = val;
+        break;
+      case 4:
+        r = base + color;
+        g = base;
+        b = val;
+        break;
+      case 5:
+        r = val;
+        g = base;
+        b = val - color;
+        break;
+    }
+  }
+  r = pgm_read_byte(&CIE1931_CURVE[r]);
+  g = pgm_read_byte(&CIE1931_CURVE[g]);
+  b = pgm_read_byte(&CIE1931_CURVE[b]);
+
+  setrgb(r, g, b, led1);
+}
+
+void setrgb(uint8_t r, uint8_t g, uint8_t b, LED_TYPE *led1) {
+  (*led1).r = r;
+  (*led1).g = g;
+  (*led1).b = b;
+}
+
+
+uint32_t eeconfig_read_rgblight(void) {
+  return eeprom_read_dword(EECONFIG_RGBLIGHT);
+}
+void eeconfig_update_rgblight(uint32_t val) {
+  eeprom_update_dword(EECONFIG_RGBLIGHT, val);
+}
+void eeconfig_update_rgblight_default(void) {
+  dprintf("eeconfig_update_rgblight_default\n");
+  rgblight_config.enable = 1;
+  rgblight_config.mode = 1;
+  rgblight_config.hue = 0;
+  rgblight_config.sat = 255;
+  rgblight_config.val = 255;
+  eeconfig_update_rgblight(rgblight_config.raw);
+}
+void eeconfig_debug_rgblight(void) {
+  dprintf("rgblight_config eprom\n");
+  dprintf("rgblight_config.enable = %d\n", rgblight_config.enable);
+  dprintf("rghlight_config.mode = %d\n", rgblight_config.mode);
+  dprintf("rgblight_config.hue = %d\n", rgblight_config.hue);
+  dprintf("rgblight_config.sat = %d\n", rgblight_config.sat);
+  dprintf("rgblight_config.val = %d\n", rgblight_config.val);
+}
+
+void rgblight_init(void) {
+  debug_enable = 1; // Debug ON!
+  dprintf("rgblight_init called.\n");
+  rgblight_inited = 1;
+  dprintf("rgblight_init start!\n");
+  if (!eeconfig_is_enabled()) {
+    dprintf("rgblight_init eeconfig is not enabled.\n");
+    eeconfig_init();
+    eeconfig_update_rgblight_default();
+  }
+  rgblight_config.raw = eeconfig_read_rgblight();
+  if (!rgblight_config.mode) {
+    dprintf("rgblight_init rgblight_config.mode = 0. Write default values to EEPROM.\n");
+    eeconfig_update_rgblight_default();
+    rgblight_config.raw = eeconfig_read_rgblight();
+  }
+  eeconfig_debug_rgblight(); // display current eeprom values
+
+  #ifdef RGBLIGHT_ANIMATIONS
+    rgblight_timer_init(); // setup the timer
+  #endif
+
+  if (rgblight_config.enable) {
+    rgblight_mode(rgblight_config.mode);
+  }
+}
+
+void rgblight_update_dword(uint32_t dword) {
+  rgblight_config.raw = dword;
+  eeconfig_update_rgblight(rgblight_config.raw);
+  if (rgblight_config.enable)
+    rgblight_mode(rgblight_config.mode);
+  else {
+    #ifdef RGBLIGHT_ANIMATIONS
+      rgblight_timer_disable();
+    #endif
+      rgblight_set();
+  }
+}
+
+void rgblight_increase(void) {
+  uint8_t mode = 0;
+  if (rgblight_config.mode < RGBLIGHT_MODES) {
+    mode = rgblight_config.mode + 1;
+  }
+  rgblight_mode(mode);
+}
+void rgblight_decrease(void) {
+  uint8_t mode = 0;
+  // Mode will never be < 1. If it ever is, eeprom needs to be initialized.
+  if (rgblight_config.mode > 1) {
+    mode = rgblight_config.mode - 1;
+  }
+  rgblight_mode(mode);
+}
+void rgblight_step(void) {
+  uint8_t mode = 0;
+  mode = rgblight_config.mode + 1;
+  if (mode > RGBLIGHT_MODES) {
+    mode = 1;
+  }
+  rgblight_mode(mode);
+}
+void rgblight_step_reverse(void) {
+  uint8_t mode = 0;
+  mode = rgblight_config.mode - 1;
+  if (mode < 1) {
+    mode = RGBLIGHT_MODES;
+  }
+  rgblight_mode(mode);
+}
+
+uint32_t rgblight_get_mode(void) {
+  if (!rgblight_config.enable) {
+    return false;
+  }
+
+  return rgblight_config.mode;
+}
+
+void rgblight_mode(uint8_t mode) {
+  if (!rgblight_config.enable) {
+    return;
+  }
+  if (mode < 1) {
+    rgblight_config.mode = 1;
+  } else if (mode > RGBLIGHT_MODES) {
+    rgblight_config.mode = RGBLIGHT_MODES;
+  } else {
+    rgblight_config.mode = mode;
+  }
+  eeconfig_update_rgblight(rgblight_config.raw);
+  xprintf("rgblight mode: %u\n", rgblight_config.mode);
+  if (rgblight_config.mode == 1) {
+    #ifdef RGBLIGHT_ANIMATIONS
+      rgblight_timer_disable();
+    #endif
+  } else if (rgblight_config.mode >= 2 && rgblight_config.mode <= 24) {
+    // MODE 2-5, breathing
+    // MODE 6-8, rainbow mood
+    // MODE 9-14, rainbow swirl
+    // MODE 15-20, snake
+    // MODE 21-23, knight
+    // MODE 24, xmas
+    // MODE 25-34, static rainbow
+
+    #ifdef RGBLIGHT_ANIMATIONS
+      rgblight_timer_enable();
+    #endif
+  } else if (rgblight_config.mode >= 25 && rgblight_config.mode <= 34) {
+    // MODE 25-34, static gradient
+
+    #ifdef RGBLIGHT_ANIMATIONS
+      rgblight_timer_disable();
+    #endif
+  }
+  rgblight_sethsv(rgblight_config.hue, rgblight_config.sat, rgblight_config.val);
+}
+
+void rgblight_toggle(void) {
+  xprintf("rgblight toggle: rgblight_config.enable = %u\n", !rgblight_config.enable);
+  if (rgblight_config.enable) {
+    rgblight_disable();
+  }
+  else {
+    rgblight_enable();
+  }
+}
+
+void rgblight_enable(void) {
+  rgblight_config.enable = 1;
+  eeconfig_update_rgblight(rgblight_config.raw);
+  xprintf("rgblight enable: rgblight_config.enable = %u\n", rgblight_config.enable);
+  rgblight_mode(rgblight_config.mode);
+}
+
+void rgblight_disable(void) {
+  rgblight_config.enable = 0;
+  eeconfig_update_rgblight(rgblight_config.raw);
+  xprintf("rgblight disable: rgblight_config.enable = %u\n", rgblight_config.enable);
+  #ifdef RGBLIGHT_ANIMATIONS
+    rgblight_timer_disable();
+  #endif
+  _delay_ms(50);
+  rgblight_set();
+}
+
+
+void rgblight_increase_hue(void) {
+  uint16_t hue;
+  hue = (rgblight_config.hue+RGBLIGHT_HUE_STEP) % 360;
+  rgblight_sethsv(hue, rgblight_config.sat, rgblight_config.val);
+}
+void rgblight_decrease_hue(void) {
+  uint16_t hue;
+  if (rgblight_config.hue-RGBLIGHT_HUE_STEP < 0) {
+    hue = (rgblight_config.hue + 360 - RGBLIGHT_HUE_STEP) % 360;
+  } else {
+    hue = (rgblight_config.hue - RGBLIGHT_HUE_STEP) % 360;
+  }
+  rgblight_sethsv(hue, rgblight_config.sat, rgblight_config.val);
+}
+void rgblight_increase_sat(void) {
+  uint8_t sat;
+  if (rgblight_config.sat + RGBLIGHT_SAT_STEP > 255) {
+    sat = 255;
+  } else {
+    sat = rgblight_config.sat + RGBLIGHT_SAT_STEP;
+  }
+  rgblight_sethsv(rgblight_config.hue, sat, rgblight_config.val);
+}
+void rgblight_decrease_sat(void) {
+  uint8_t sat;
+  if (rgblight_config.sat - RGBLIGHT_SAT_STEP < 0) {
+    sat = 0;
+  } else {
+    sat = rgblight_config.sat - RGBLIGHT_SAT_STEP;
+  }
+  rgblight_sethsv(rgblight_config.hue, sat, rgblight_config.val);
+}
+void rgblight_increase_val(void) {
+  uint8_t val;
+  if (rgblight_config.val + RGBLIGHT_VAL_STEP > 255) {
+    val = 255;
+  } else {
+    val = rgblight_config.val + RGBLIGHT_VAL_STEP;
+  }
+  rgblight_sethsv(rgblight_config.hue, rgblight_config.sat, val);
+}
+void rgblight_decrease_val(void) {
+  uint8_t val;
+  if (rgblight_config.val - RGBLIGHT_VAL_STEP < 0) {
+    val = 0;
+  } else {
+    val = rgblight_config.val - RGBLIGHT_VAL_STEP;
+  }
+  rgblight_sethsv(rgblight_config.hue, rgblight_config.sat, val);
+}
+
+void rgblight_sethsv_noeeprom(uint16_t hue, uint8_t sat, uint8_t val) {
+  inmem_config.raw = rgblight_config.raw;
+  if (rgblight_config.enable) {
+    LED_TYPE tmp_led;
+    sethsv(hue, sat, val, &tmp_led);
+    inmem_config.hue = hue;
+    inmem_config.sat = sat;
+    inmem_config.val = val;
+    // dprintf("rgblight set hue [MEMORY]: %u,%u,%u\n", inmem_config.hue, inmem_config.sat, inmem_config.val);
+    rgblight_setrgb(tmp_led.r, tmp_led.g, tmp_led.b);
+  }
+}
+void rgblight_sethsv(uint16_t hue, uint8_t sat, uint8_t val) {
+  if (rgblight_config.enable) {
+    if (rgblight_config.mode == 1) {
+      // same static color
+      rgblight_sethsv_noeeprom(hue, sat, val);
+    } else {
+      // all LEDs in same color
+      if (rgblight_config.mode >= 2 && rgblight_config.mode <= 5) {
+        // breathing mode, ignore the change of val, use in memory value instead
+        val = rgblight_config.val;
+      } else if (rgblight_config.mode >= 6 && rgblight_config.mode <= 14) {
+        // rainbow mood and rainbow swirl, ignore the change of hue
+        hue = rgblight_config.hue;
+      } else if (rgblight_config.mode >= 25 && rgblight_config.mode <= 34) {
+        // static gradient
+        uint16_t _hue;
+        int8_t direction = ((rgblight_config.mode - 25) % 2) ? -1 : 1;
+        uint16_t range = pgm_read_word(&RGBLED_GRADIENT_RANGES[(rgblight_config.mode - 25) / 2]);
+        for (uint8_t i = 0; i < RGBLED_NUM; i++) {
+          _hue = (range / RGBLED_NUM * i * direction + hue + 360) % 360;
+          dprintf("rgblight rainbow set hsv: %u,%u,%d,%u\n", i, _hue, direction, range);
+          sethsv(_hue, sat, val, (LED_TYPE *)&led[i]);
+        }
+        rgblight_set();
+      }
+    }
+    rgblight_config.hue = hue;
+    rgblight_config.sat = sat;
+    rgblight_config.val = val;
+    eeconfig_update_rgblight(rgblight_config.raw);
+    xprintf("rgblight set hsv [EEPROM]: %u,%u,%u\n", rgblight_config.hue, rgblight_config.sat, rgblight_config.val);
+  }
+}
+
+uint16_t rgblight_get_hue(void) {
+  return rgblight_config.hue;
+}
+
+uint8_t rgblight_get_sat(void) {
+  return rgblight_config.sat;
+}
+
+uint8_t rgblight_get_val(void) {
+  return rgblight_config.val;
+}
+
+void rgblight_setrgb(uint8_t r, uint8_t g, uint8_t b) {
+  if (!rgblight_config.enable) { return; }
+
+  for (uint8_t i = 0; i < RGBLED_NUM; i++) {
+    led[i].r = r;
+    led[i].g = g;
+    led[i].b = b;
+  }
+  rgblight_set();
+}
+
+void rgblight_setrgb_at(uint8_t r, uint8_t g, uint8_t b, uint8_t index) {
+  if (!rgblight_config.enable || index >= RGBLED_NUM) { return; }
+
+  led[index].r = r;
+  led[index].g = g;
+  led[index].b = b;
+  rgblight_set();
+}
+
+void rgblight_sethsv_at(uint16_t hue, uint8_t sat, uint8_t val, uint8_t index) {
+  if (!rgblight_config.enable) { return; }
+
+  LED_TYPE tmp_led;
+  sethsv(hue, sat, val, &tmp_led);
+  rgblight_setrgb_at(tmp_led.r, tmp_led.g, tmp_led.b, index);
+}
+
+#ifndef RGBLIGHT_CUSTOM_DRIVER
+void rgblight_set(void) {
+  if (rgblight_config.enable) {
+    #ifdef RGBW
+      ws2812_setleds_rgbw(led, RGBLED_NUM);
+    #else
+      ws2812_setleds(led, RGBLED_NUM);
+    #endif
+  } else {
+    for (uint8_t i = 0; i < RGBLED_NUM; i++) {
+      led[i].r = 0;
+      led[i].g = 0;
+      led[i].b = 0;
+    }
+    #ifdef RGBW
+      ws2812_setleds_rgbw(led, RGBLED_NUM);
+    #else
+      ws2812_setleds(led, RGBLED_NUM);
+    #endif
+  }
+}
+#endif
+
+#ifdef RGBLIGHT_ANIMATIONS
+
+// Animation timer -- AVR Timer3
+void rgblight_timer_init(void) {
+  // static uint8_t rgblight_timer_is_init = 0;
+  // if (rgblight_timer_is_init) {
+  //   return;
+  // }
+  // rgblight_timer_is_init = 1;
+  // /* Timer 3 setup */
+  // TCCR3B = _BV(WGM32) // CTC mode OCR3A as TOP
+  //       | _BV(CS30); // Clock selelct: clk/1
+  // /* Set TOP value */
+  // uint8_t sreg = SREG;
+  // cli();
+  // OCR3AH = (RGBLED_TIMER_TOP >> 8) & 0xff;
+  // OCR3AL = RGBLED_TIMER_TOP & 0xff;
+  // SREG = sreg;
+
+  rgblight_timer_enabled = true;
+}
+void rgblight_timer_enable(void) {
+  rgblight_timer_enabled = true;
+  dprintf("TIMER3 enabled.\n");
+}
+void rgblight_timer_disable(void) {
+  rgblight_timer_enabled = false;
+  dprintf("TIMER3 disabled.\n");
+}
+void rgblight_timer_toggle(void) {
+  rgblight_timer_enabled ^= rgblight_timer_enabled;
+  dprintf("TIMER3 toggled.\n");
+}
+
+void rgblight_show_solid_color(uint8_t r, uint8_t g, uint8_t b) {
+  rgblight_enable();
+  rgblight_mode(1);
+  rgblight_setrgb(r, g, b);
+}
+
+void rgblight_task(void) {
+  if (rgblight_inited == 1) { //modify for led_test
+      /* first call */
+      rgblight_inited = 2;
+      rgblight_enable();
+      rgblight_mode(2);
+  }
+  if (rgblight_timer_enabled) {
+    // mode = 1, static light, do nothing here
+    if (rgblight_config.mode >= 2 && rgblight_config.mode <= 5) {
+      // mode = 2 to 5, breathing mode
+      rgblight_effect_breathing(rgblight_config.mode - 2);
+#if 0
+    } else if (rgblight_config.mode >= 6 && rgblight_config.mode <= 8) {
+      // mode = 6 to 8, rainbow mood mod
+      rgblight_effect_rainbow_mood(rgblight_config.mode - 6);
+    } else if (rgblight_config.mode >= 9 && rgblight_config.mode <= 14) {
+      // mode = 9 to 14, rainbow swirl mode
+      rgblight_effect_rainbow_swirl(rgblight_config.mode - 9);
+    } else if (rgblight_config.mode >= 15 && rgblight_config.mode <= 20) {
+      // mode = 15 to 20, snake mode
+      rgblight_effect_snake(rgblight_config.mode - 15);
+    } else if (rgblight_config.mode >= 21 && rgblight_config.mode <= 23) {
+      // mode = 21 to 23, knight mode
+      rgblight_effect_knight(rgblight_config.mode - 21);
+    } else if (rgblight_config.mode == 24) {
+      // mode = 24, christmas mode
+      rgblight_effect_christmas();
+#endif
+    }
+  }
+}
+
+// Effects
+void rgblight_effect_breathing(uint8_t interval) {
+  static uint8_t pos = 0;
+  static uint16_t last_timer = 0;
+
+  if (timer_elapsed(last_timer) < pgm_read_word(&RGBLED_BREATHING_INTERVALS[interval])) {//modify for led_test
+    return;
+  }
+  last_timer = timer_read();
+
+
+  //modify for led_test
+  rgblight_config.hue = (pos*120)%360;
+  rgblight_sethsv_noeeprom(rgblight_config.hue, rgblight_config.sat, rgblight_config.val);
+  pos = (pos + 1) % 3;
+}
+#if 0
+void rgblight_effect_rainbow_mood(uint8_t interval) {
+  static uint16_t current_hue = 0;
+  static uint16_t last_timer = 0;
+
+  if (timer_elapsed(last_timer) < pgm_read_byte(&RGBLED_RAINBOW_MOOD_INTERVALS[interval])) {
+    return;
+  }
+  last_timer = timer_read();
+  rgblight_sethsv_noeeprom(current_hue, rgblight_config.sat, rgblight_config.val);
+  current_hue = (current_hue + 1) % 360;
+}
+void rgblight_effect_rainbow_swirl(uint8_t interval) {
+  static uint16_t current_hue = 0;
+  static uint16_t last_timer = 0;
+  uint16_t hue;
+  uint8_t i;
+  if (timer_elapsed(last_timer) < pgm_read_byte(&RGBLED_RAINBOW_SWIRL_INTERVALS[interval / 2])) {
+    return;
+  }
+  last_timer = timer_read();
+  for (i = 0; i < RGBLED_NUM; i++) {
+    hue = (360 / RGBLED_NUM * i + current_hue) % 360;
+    sethsv(hue, rgblight_config.sat, rgblight_config.val, (LED_TYPE *)&led[i]);
+  }
+  rgblight_set();
+
+  if (interval % 2) {
+    current_hue = (current_hue + 1) % 360;
+  } else {
+    if (current_hue - 1 < 0) {
+      current_hue = 359;
+    } else {
+      current_hue = current_hue - 1;
+    }
+  }
+}
+void rgblight_effect_snake(uint8_t interval) {
+  static uint8_t pos = 0;
+  static uint16_t last_timer = 0;
+  uint8_t i, j;
+  int8_t k;
+  int8_t increment = 1;
+  if (interval % 2) {
+    increment = -1;
+  }
+  if (timer_elapsed(last_timer) < pgm_read_byte(&RGBLED_SNAKE_INTERVALS[interval / 2])) {
+    return;
+  }
+  last_timer = timer_read();
+  for (i = 0; i < RGBLED_NUM; i++) {
+    led[i].r = 0;
+    led[i].g = 0;
+    led[i].b = 0;
+    for (j = 0; j < RGBLIGHT_EFFECT_SNAKE_LENGTH; j++) {
+      k = pos + j * increment;
+      if (k < 0) {
+        k = k + RGBLED_NUM;
+      }
+      if (i == k) {
+        sethsv(rgblight_config.hue, rgblight_config.sat, (uint8_t)(rgblight_config.val*(RGBLIGHT_EFFECT_SNAKE_LENGTH-j)/RGBLIGHT_EFFECT_SNAKE_LENGTH), (LED_TYPE *)&led[i]);
+      }
+    }
+  }
+  rgblight_set();
+  if (increment == 1) {
+    if (pos - 1 < 0) {
+      pos = RGBLED_NUM - 1;
+    } else {
+      pos -= 1;
+    }
+  } else {
+    pos = (pos + 1) % RGBLED_NUM;
+  }
+}
+void rgblight_effect_knight(uint8_t interval) {
+  static uint16_t last_timer = 0;
+  if (timer_elapsed(last_timer) < pgm_read_byte(&RGBLED_KNIGHT_INTERVALS[interval])) {
+    return;
+  }
+  last_timer = timer_read();
+
+  static int8_t low_bound = 0;
+  static int8_t high_bound = RGBLIGHT_EFFECT_KNIGHT_LENGTH - 1;
+  static int8_t increment = 1;
+  uint8_t i, cur;
+
+  // Set all the LEDs to 0
+  for (i = 0; i < RGBLED_NUM; i++) {
+    led[i].r = 0;
+    led[i].g = 0;
+    led[i].b = 0;
+  }
+  // Determine which LEDs should be lit up
+  for (i = 0; i < RGBLIGHT_EFFECT_KNIGHT_LED_NUM; i++) {
+    cur = (i + RGBLIGHT_EFFECT_KNIGHT_OFFSET) % RGBLED_NUM;
+
+    if (i >= low_bound && i <= high_bound) {
+      sethsv(rgblight_config.hue, rgblight_config.sat, rgblight_config.val, (LED_TYPE *)&led[cur]);
+    } else {
+      led[cur].r = 0;
+      led[cur].g = 0;
+      led[cur].b = 0;
+    }
+  }
+  rgblight_set();
+
+  // Move from low_bound to high_bound changing the direction we increment each
+  // time a boundary is hit.
+  low_bound += increment;
+  high_bound += increment;
+
+  if (high_bound <= 0 || low_bound >= RGBLIGHT_EFFECT_KNIGHT_LED_NUM - 1) {
+    increment = -increment;
+  }
+}
+
+
+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) < RGBLIGHT_EFFECT_CHRISTMAS_INTERVAL) {
+    return;
+  }
+  last_timer = timer_read();
+  current_offset = (current_offset + 1) % 2;
+  for (i = 0; i < RGBLED_NUM; i++) {
+    hue = 0 + ((i/RGBLIGHT_EFFECT_CHRISTMAS_STEP + current_offset) % 2) * 120;
+    sethsv(hue, rgblight_config.sat, rgblight_config.val, (LED_TYPE *)&led[i]);
+  }
+  rgblight_set();
+}
+#endif /* 0 */
+#endif /* RGBLIGHT_ANIMATIONS */