quantum/rgblight.c

   1 /* Copyright 2016-2017 Yang Liu
   2  *
   3  * This program is free software: you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation, either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16 #include <math.h>
  17 #include <avr/eeprom.h>
  18 #include <avr/interrupt.h>
  19 #include <util/delay.h>
  20 #include "progmem.h"
  21 #include "timer.h"
  22 #include "rgblight.h"
  23 #include "debug.h"
  24 #include "led_tables.h"
  25
  26 __attribute__ ((weak))
  27 const uint8_t RGBLED_BREATHING_INTERVALS[] PROGMEM = {30, 20, 10, 5};
  28 __attribute__ ((weak))
  29 const uint8_t RGBLED_RAINBOW_MOOD_INTERVALS[] PROGMEM = {120, 60, 30};
  30 __attribute__ ((weak))
  31 const uint8_t RGBLED_RAINBOW_SWIRL_INTERVALS[] PROGMEM = {100, 50, 20};
  32 __attribute__ ((weak))
  33 const uint8_t RGBLED_SNAKE_INTERVALS[] PROGMEM = {100, 50, 20};
  34 __attribute__ ((weak))
  35 const uint8_t RGBLED_KNIGHT_INTERVALS[] PROGMEM = {127, 63, 31};
  36 __attribute__ ((weak))
  37 const uint16_t RGBLED_GRADIENT_RANGES[] PROGMEM = {360, 240, 180, 120, 90};
  38
  39 rgblight_config_t rgblight_config;
  40 rgblight_config_t inmem_config;
  41
  42 LED_TYPE led[RGBLED_NUM];
  43 uint8_t rgblight_inited = 0;
  44 bool rgblight_timer_enabled = false;
  45
  46 void sethsv(uint16_t hue, uint8_t sat, uint8_t val, LED_TYPE *led1) {
  47   uint8_t r = 0, g = 0, b = 0, base, color;
  48
  49   if (sat == 0) { // Acromatic color (gray). Hue doesn't mind.
  50     r = val;
  51     g = val;
  52     b = val;
  53   } else {
  54     base = ((255 - sat) * val) >> 8;
  55     color = (val - base) * (hue % 60) / 60;
  56
  57     switch (hue / 60) {
  58       case 0:
  59         r = val;
  60         g = base + color;
  61         b = base;
  62         break;
  63       case 1:
  64         r = val - color;
  65         g = val;
  66         b = base;
  67         break;
  68       case 2:
  69         r = base;
  70         g = val;
  71         b = base + color;
  72         break;
  73       case 3:
  74         r = base;
  75         g = val - color;
  76         b = val;
  77         break;
  78       case 4:
  79         r = base + color;
  80         g = base;
  81         b = val;
  82         break;
  83       case 5:
  84         r = val;
  85         g = base;
  86         b = val - color;
  87         break;
  88     }
  89   }
  90   r = pgm_read_byte(&CIE1931_CURVE[r]);
  91   g = pgm_read_byte(&CIE1931_CURVE[g]);
  92   b = pgm_read_byte(&CIE1931_CURVE[b]);
  93
  94   setrgb(r, g, b, led1);
  95 }
  96
  97 void setrgb(uint8_t r, uint8_t g, uint8_t b, LED_TYPE *led1) {
  98   (*led1).r = r;
  99   (*led1).g = g;
 100   (*led1).b = b;
 101 }
 102
 103
 104 uint32_t eeconfig_read_rgblight(void) {
 105   return eeprom_read_dword(EECONFIG_RGBLIGHT);
 106 }
 107 void eeconfig_update_rgblight(uint32_t val) {
 108   eeprom_update_dword(EECONFIG_RGBLIGHT, val);
 109 }
 110 void eeconfig_update_rgblight_default(void) {
 111   dprintf("eeconfig_update_rgblight_default\n");
 112   rgblight_config.enable = 1;
 113   rgblight_config.mode = 1;
 114   rgblight_config.hue = 0;
 115   rgblight_config.sat = 255;
 116   rgblight_config.val = 255;
 117   eeconfig_update_rgblight(rgblight_config.raw);
 118 }
 119 void eeconfig_debug_rgblight(void) {
 120   dprintf("rgblight_config eprom\n");
 121   dprintf("rgblight_config.enable = %d\n", rgblight_config.enable);
 122   dprintf("rghlight_config.mode = %d\n", rgblight_config.mode);
 123   dprintf("rgblight_config.hue = %d\n", rgblight_config.hue);
 124   dprintf("rgblight_config.sat = %d\n", rgblight_config.sat);
 125   dprintf("rgblight_config.val = %d\n", rgblight_config.val);
 126 }
 127
 128 void rgblight_init(void) {
 129   debug_enable = 1; // Debug ON!
 130   dprintf("rgblight_init called.\n");
 131   rgblight_inited = 1;
 132   dprintf("rgblight_init start!\n");
 133   if (!eeconfig_is_enabled()) {
 134     dprintf("rgblight_init eeconfig is not enabled.\n");
 135     eeconfig_init();
 136     eeconfig_update_rgblight_default();
 137   }
 138   rgblight_config.raw = eeconfig_read_rgblight();
 139   if (!rgblight_config.mode) {
 140     dprintf("rgblight_init rgblight_config.mode = 0. Write default values to EEPROM.\n");
 141     eeconfig_update_rgblight_default();
 142     rgblight_config.raw = eeconfig_read_rgblight();
 143   }
 144   eeconfig_debug_rgblight(); // display current eeprom values
 145
 146   #ifdef RGBLIGHT_ANIMATIONS
 147     rgblight_timer_init(); // setup the timer
 148   #endif
 149
 150   if (rgblight_config.enable) {
 151     rgblight_mode(rgblight_config.mode);
 152   }
 153 }
 154
 155 void rgblight_update_dword(uint32_t dword) {
 156   rgblight_config.raw = dword;
 157   eeconfig_update_rgblight(rgblight_config.raw);
 158   if (rgblight_config.enable)
 159     rgblight_mode(rgblight_config.mode);
 160   else {
 161     #ifdef RGBLIGHT_ANIMATIONS
 162       rgblight_timer_disable();
 163     #endif
 164       rgblight_set();
 165   }
 166 }
 167
 168 void rgblight_increase(void) {
 169   uint8_t mode = 0;
 170   if (rgblight_config.mode < RGBLIGHT_MODES) {
 171     mode = rgblight_config.mode + 1;
 172   }
 173   rgblight_mode(mode);
 174 }
 175 void rgblight_decrease(void) {
 176   uint8_t mode = 0;
 177   // Mode will never be < 1. If it ever is, eeprom needs to be initialized.
 178   if (rgblight_config.mode > 1) {
 179     mode = rgblight_config.mode - 1;
 180   }
 181   rgblight_mode(mode);
 182 }
 183 void rgblight_step(void) {
 184   uint8_t mode = 0;
 185   mode = rgblight_config.mode + 1;
 186   if (mode > RGBLIGHT_MODES) {
 187     mode = 1;
 188   }
 189   rgblight_mode(mode);
 190 }
 191 void rgblight_step_reverse(void) {
 192   uint8_t mode = 0;
 193   mode = rgblight_config.mode - 1;
 194   if (mode < 1) {
 195     mode = RGBLIGHT_MODES;
 196   }
 197   rgblight_mode(mode);
 198 }
 199
 200 uint32_t rgblight_get_mode(void) {
 201   if (!rgblight_config.enable) {
 202     return false;
 203   }
 204
 205   return rgblight_config.mode;
 206 }
 207
 208 void rgblight_mode(uint8_t mode) {
 209   if (!rgblight_config.enable) {
 210     return;
 211   }
 212   if (mode < 1) {
 213     rgblight_config.mode = 1;
 214   } else if (mode > RGBLIGHT_MODES) {
 215     rgblight_config.mode = RGBLIGHT_MODES;
 216   } else {
 217     rgblight_config.mode = mode;
 218   }
 219   eeconfig_update_rgblight(rgblight_config.raw);
 220   xprintf("rgblight mode: %u\n", rgblight_config.mode);
 221   if (rgblight_config.mode == 1) {
 222     #ifdef RGBLIGHT_ANIMATIONS
 223       rgblight_timer_disable();
 224     #endif
 225   } else if (rgblight_config.mode >= 2 && rgblight_config.mode <= 24) {
 226     // MODE 2-5, breathing
 227     // MODE 6-8, rainbow mood
 228     // MODE 9-14, rainbow swirl
 229     // MODE 15-20, snake
 230     // MODE 21-23, knight
 231     // MODE 24, xmas
 232     // MODE 25-34, static rainbow
 233
 234     #ifdef RGBLIGHT_ANIMATIONS
 235       rgblight_timer_enable();
 236     #endif
 237   } else if (rgblight_config.mode >= 25 && rgblight_config.mode <= 34) {
 238     // MODE 25-34, static gradient
 239
 240     #ifdef RGBLIGHT_ANIMATIONS
 241       rgblight_timer_disable();
 242     #endif
 243   }
 244   rgblight_sethsv(rgblight_config.hue, rgblight_config.sat, rgblight_config.val);
 245 }
 246
 247 void rgblight_toggle(void) {
 248   rgblight_config.enable ^= 1;
 249   eeconfig_update_rgblight(rgblight_config.raw);
 250   xprintf("rgblight toggle: rgblight_config.enable = %u\n", rgblight_config.enable);
 251   if (rgblight_config.enable) {
 252     rgblight_mode(rgblight_config.mode);
 253   } else {
 254     #ifdef RGBLIGHT_ANIMATIONS
 255       rgblight_timer_disable();
 256     #endif
 257     _delay_ms(50);
 258     rgblight_set();
 259   }
 260 }
 261
 262 void rgblight_enable(void) {
 263   rgblight_config.enable = 1;
 264   eeconfig_update_rgblight(rgblight_config.raw);
 265   xprintf("rgblight enable: rgblight_config.enable = %u\n", rgblight_config.enable);
 266   rgblight_mode(rgblight_config.mode);
 267 }
 268
 269
 270 void rgblight_increase_hue(void) {
 271   uint16_t hue;
 272   hue = (rgblight_config.hue+RGBLIGHT_HUE_STEP) % 360;
 273   rgblight_sethsv(hue, rgblight_config.sat, rgblight_config.val);
 274 }
 275 void rgblight_decrease_hue(void) {
 276   uint16_t hue;
 277   if (rgblight_config.hue-RGBLIGHT_HUE_STEP < 0) {
 278     hue = (rgblight_config.hue + 360 - RGBLIGHT_HUE_STEP) % 360;
 279   } else {
 280     hue = (rgblight_config.hue - RGBLIGHT_HUE_STEP) % 360;
 281   }
 282   rgblight_sethsv(hue, rgblight_config.sat, rgblight_config.val);
 283 }
 284 void rgblight_increase_sat(void) {
 285   uint8_t sat;
 286   if (rgblight_config.sat + RGBLIGHT_SAT_STEP > 255) {
 287     sat = 255;
 288   } else {
 289     sat = rgblight_config.sat + RGBLIGHT_SAT_STEP;
 290   }
 291   rgblight_sethsv(rgblight_config.hue, sat, rgblight_config.val);
 292 }
 293 void rgblight_decrease_sat(void) {
 294   uint8_t sat;
 295   if (rgblight_config.sat - RGBLIGHT_SAT_STEP < 0) {
 296     sat = 0;
 297   } else {
 298     sat = rgblight_config.sat - RGBLIGHT_SAT_STEP;
 299   }
 300   rgblight_sethsv(rgblight_config.hue, sat, rgblight_config.val);
 301 }
 302 void rgblight_increase_val(void) {
 303   uint8_t val;
 304   if (rgblight_config.val + RGBLIGHT_VAL_STEP > 255) {
 305     val = 255;
 306   } else {
 307     val = rgblight_config.val + RGBLIGHT_VAL_STEP;
 308   }
 309   rgblight_sethsv(rgblight_config.hue, rgblight_config.sat, val);
 310 }
 311 void rgblight_decrease_val(void) {
 312   uint8_t val;
 313   if (rgblight_config.val - RGBLIGHT_VAL_STEP < 0) {
 314     val = 0;
 315   } else {
 316     val = rgblight_config.val - RGBLIGHT_VAL_STEP;
 317   }
 318   rgblight_sethsv(rgblight_config.hue, rgblight_config.sat, val);
 319 }
 320
 321 void rgblight_sethsv_noeeprom(uint16_t hue, uint8_t sat, uint8_t val) {
 322   inmem_config.raw = rgblight_config.raw;
 323   if (rgblight_config.enable) {
 324     LED_TYPE tmp_led;
 325     sethsv(hue, sat, val, &tmp_led);
 326     inmem_config.hue = hue;
 327     inmem_config.sat = sat;
 328     inmem_config.val = val;
 329     // dprintf("rgblight set hue [MEMORY]: %u,%u,%u\n", inmem_config.hue, inmem_config.sat, inmem_config.val);
 330     rgblight_setrgb(tmp_led.r, tmp_led.g, tmp_led.b);
 331   }
 332 }
 333 void rgblight_sethsv(uint16_t hue, uint8_t sat, uint8_t val) {
 334   if (rgblight_config.enable) {
 335     if (rgblight_config.mode == 1) {
 336       // same static color
 337       rgblight_sethsv_noeeprom(hue, sat, val);
 338     } else {
 339       // all LEDs in same color
 340       if (rgblight_config.mode >= 2 && rgblight_config.mode <= 5) {
 341         // breathing mode, ignore the change of val, use in memory value instead
 342         val = rgblight_config.val;
 343       } else if (rgblight_config.mode >= 6 && rgblight_config.mode <= 14) {
 344         // rainbow mood and rainbow swirl, ignore the change of hue
 345         hue = rgblight_config.hue;
 346       } else if (rgblight_config.mode >= 25 && rgblight_config.mode <= 34) {
 347         // static gradient
 348         uint16_t _hue;
 349         int8_t direction = ((rgblight_config.mode - 25) % 2) ? -1 : 1;
 350         uint16_t range = pgm_read_word(&RGBLED_GRADIENT_RANGES[(rgblight_config.mode - 25) / 2]);
 351         for (uint8_t i = 0; i < RGBLED_NUM; i++) {
 352           _hue = (range / RGBLED_NUM * i * direction + hue + 360) % 360;
 353           dprintf("rgblight rainbow set hsv: %u,%u,%d,%u\n", i, _hue, direction, range);
 354           sethsv(_hue, sat, val, (LED_TYPE *)&led[i]);
 355         }
 356         rgblight_set();
 357       }
 358     }
 359     rgblight_config.hue = hue;
 360     rgblight_config.sat = sat;
 361     rgblight_config.val = val;
 362     eeconfig_update_rgblight(rgblight_config.raw);
 363     xprintf("rgblight set hsv [EEPROM]: %u,%u,%u\n", rgblight_config.hue, rgblight_config.sat, rgblight_config.val);
 364   }
 365 }
 366
 367 void rgblight_setrgb(uint8_t r, uint8_t g, uint8_t b) {
 368   // dprintf("rgblight set rgb: %u,%u,%u\n", r,g,b);
 369   for (uint8_t i = 0; i < RGBLED_NUM; i++) {
 370     led[i].r = r;
 371     led[i].g = g;
 372     led[i].b = b;
 373   }
 374   rgblight_set();
 375 }
 376
 377 #ifndef RGBLIGHT_CUSTOM_DRIVER
 378 void rgblight_set(void) {
 379   if (rgblight_config.enable) {
 380     #ifdef RGBW
 381       ws2812_setleds_rgbw(led, RGBLED_NUM);
 382     #else
 383       ws2812_setleds(led, RGBLED_NUM);
 384     #endif
 385   } else {
 386     for (uint8_t i = 0; i < RGBLED_NUM; i++) {
 387       led[i].r = 0;
 388       led[i].g = 0;
 389       led[i].b = 0;
 390     }
 391     #ifdef RGBW
 392       ws2812_setleds_rgbw(led, RGBLED_NUM);
 393     #else
 394       ws2812_setleds(led, RGBLED_NUM);
 395     #endif
 396   }
 397 }
 398 #endif
 399
 400 #ifdef RGBLIGHT_ANIMATIONS
 401
 402 // Animation timer -- AVR Timer3
 403 void rgblight_timer_init(void) {
 404   // static uint8_t rgblight_timer_is_init = 0;
 405   // if (rgblight_timer_is_init) {
 406   //   return;
 407   // }
 408   // rgblight_timer_is_init = 1;
 409   // /* Timer 3 setup */
 410   // TCCR3B = _BV(WGM32) // CTC mode OCR3A as TOP
 411   //       | _BV(CS30); // Clock selelct: clk/1
 412   // /* Set TOP value */
 413   // uint8_t sreg = SREG;
 414   // cli();
 415   // OCR3AH = (RGBLED_TIMER_TOP >> 8) & 0xff;
 416   // OCR3AL = RGBLED_TIMER_TOP & 0xff;
 417   // SREG = sreg;
 418
 419   rgblight_timer_enabled = true;
 420 }
 421 void rgblight_timer_enable(void) {
 422   rgblight_timer_enabled = true;
 423   dprintf("TIMER3 enabled.\n");
 424 }
 425 void rgblight_timer_disable(void) {
 426   rgblight_timer_enabled = false;
 427   dprintf("TIMER3 disabled.\n");
 428 }
 429 void rgblight_timer_toggle(void) {
 430   rgblight_timer_enabled ^= rgblight_timer_enabled;
 431   dprintf("TIMER3 toggled.\n");
 432 }
 433
 434 void rgblight_show_solid_color(uint8_t r, uint8_t g, uint8_t b) {
 435   rgblight_enable();
 436   rgblight_mode(1);
 437   rgblight_setrgb(r, g, b);
 438 }
 439
 440 void rgblight_task(void) {
 441   if (rgblight_timer_enabled) {
 442     // mode = 1, static light, do nothing here
 443     if (rgblight_config.mode >= 2 && rgblight_config.mode <= 5) {
 444       // mode = 2 to 5, breathing mode
 445       rgblight_effect_breathing(rgblight_config.mode - 2);
 446     } else if (rgblight_config.mode >= 6 && rgblight_config.mode <= 8) {
 447       // mode = 6 to 8, rainbow mood mod
 448       rgblight_effect_rainbow_mood(rgblight_config.mode - 6);
 449     } else if (rgblight_config.mode >= 9 && rgblight_config.mode <= 14) {
 450       // mode = 9 to 14, rainbow swirl mode
 451       rgblight_effect_rainbow_swirl(rgblight_config.mode - 9);
 452     } else if (rgblight_config.mode >= 15 && rgblight_config.mode <= 20) {
 453       // mode = 15 to 20, snake mode
 454       rgblight_effect_snake(rgblight_config.mode - 15);
 455     } else if (rgblight_config.mode >= 21 && rgblight_config.mode <= 23) {
 456       // mode = 21 to 23, knight mode
 457       rgblight_effect_knight(rgblight_config.mode - 21);
 458     } else if (rgblight_config.mode == 24) {
 459       // mode = 24, christmas mode
 460       rgblight_effect_christmas();
 461     }
 462   }
 463 }
 464
 465 // Effects
 466 void rgblight_effect_breathing(uint8_t interval) {
 467   static uint8_t pos = 0;
 468   static uint16_t last_timer = 0;
 469   float val;
 470
 471   if (timer_elapsed(last_timer) < pgm_read_byte(&RGBLED_BREATHING_INTERVALS[interval])) {
 472     return;
 473   }
 474   last_timer = timer_read();
 475
 476
 477   // http://sean.voisen.org/blog/2011/10/breathing-led-with-arduino/
 478   val = (exp(sin((pos/255.0)*M_PI)) - RGBLIGHT_EFFECT_BREATHE_CENTER/M_E)*(RGBLIGHT_EFFECT_BREATHE_MAX/(M_E-1/M_E));
 479   rgblight_sethsv_noeeprom(rgblight_config.hue, rgblight_config.sat, val);
 480   pos = (pos + 1) % 256;
 481 }
 482 void rgblight_effect_rainbow_mood(uint8_t interval) {
 483   static uint16_t current_hue = 0;
 484   static uint16_t last_timer = 0;
 485
 486   if (timer_elapsed(last_timer) < pgm_read_byte(&RGBLED_RAINBOW_MOOD_INTERVALS[interval])) {
 487     return;
 488   }
 489   last_timer = timer_read();
 490   rgblight_sethsv_noeeprom(current_hue, rgblight_config.sat, rgblight_config.val);
 491   current_hue = (current_hue + 1) % 360;
 492 }
 493 void rgblight_effect_rainbow_swirl(uint8_t interval) {
 494   static uint16_t current_hue = 0;
 495   static uint16_t last_timer = 0;
 496   uint16_t hue;
 497   uint8_t i;
 498   if (timer_elapsed(last_timer) < pgm_read_byte(&RGBLED_RAINBOW_SWIRL_INTERVALS[interval / 2])) {
 499     return;
 500   }
 501   last_timer = timer_read();
 502   for (i = 0; i < RGBLED_NUM; i++) {
 503     hue = (360 / RGBLED_NUM * i + current_hue) % 360;
 504     sethsv(hue, rgblight_config.sat, rgblight_config.val, (LED_TYPE *)&led[i]);
 505   }
 506   rgblight_set();
 507
 508   if (interval % 2) {
 509     current_hue = (current_hue + 1) % 360;
 510   } else {
 511     if (current_hue - 1 < 0) {
 512       current_hue = 359;
 513     } else {
 514       current_hue = current_hue - 1;
 515     }
 516   }
 517 }
 518 void rgblight_effect_snake(uint8_t interval) {
 519   static uint8_t pos = 0;
 520   static uint16_t last_timer = 0;
 521   uint8_t i, j;
 522   int8_t k;
 523   int8_t increment = 1;
 524   if (interval % 2) {
 525     increment = -1;
 526   }
 527   if (timer_elapsed(last_timer) < pgm_read_byte(&RGBLED_SNAKE_INTERVALS[interval / 2])) {
 528     return;
 529   }
 530   last_timer = timer_read();
 531   for (i = 0; i < RGBLED_NUM; i++) {
 532     led[i].r = 0;
 533     led[i].g = 0;
 534     led[i].b = 0;
 535     for (j = 0; j < RGBLIGHT_EFFECT_SNAKE_LENGTH; j++) {
 536       k = pos + j * increment;
 537       if (k < 0) {
 538         k = k + RGBLED_NUM;
 539       }
 540       if (i == k) {
 541         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]);
 542       }
 543     }
 544   }
 545   rgblight_set();
 546   if (increment == 1) {
 547     if (pos - 1 < 0) {
 548       pos = RGBLED_NUM - 1;
 549     } else {
 550       pos -= 1;
 551     }
 552   } else {
 553     pos = (pos + 1) % RGBLED_NUM;
 554   }
 555 }
 556 void rgblight_effect_knight(uint8_t interval) {
 557   static uint16_t last_timer = 0;
 558   if (timer_elapsed(last_timer) < pgm_read_byte(&RGBLED_KNIGHT_INTERVALS[interval])) {
 559     return;
 560   }
 561   last_timer = timer_read();
 562
 563   static int8_t low_bound = 0;
 564   static int8_t high_bound = RGBLIGHT_EFFECT_KNIGHT_LENGTH - 1;
 565   static int8_t increment = 1;
 566   uint8_t i, cur;
 567
 568   // Set all the LEDs to 0
 569   for (i = 0; i < RGBLED_NUM; i++) {
 570     led[i].r = 0;
 571     led[i].g = 0;
 572     led[i].b = 0;
 573   }
 574   // Determine which LEDs should be lit up
 575   for (i = 0; i < RGBLIGHT_EFFECT_KNIGHT_LED_NUM; i++) {
 576     cur = (i + RGBLIGHT_EFFECT_KNIGHT_OFFSET) % RGBLED_NUM;
 577
 578     if (i >= low_bound && i <= high_bound) {
 579       sethsv(rgblight_config.hue, rgblight_config.sat, rgblight_config.val, (LED_TYPE *)&led[cur]);
 580     } else {
 581       led[cur].r = 0;
 582       led[cur].g = 0;
 583       led[cur].b = 0;
 584     }
 585   }
 586   rgblight_set();
 587
 588   // Move from low_bound to high_bound changing the direction we increment each
 589   // time a boundary is hit.
 590   low_bound += increment;
 591   high_bound += increment;
 592
 593   if (high_bound <= 0 || low_bound >= RGBLIGHT_EFFECT_KNIGHT_LED_NUM - 1) {
 594     increment = -increment;
 595   }
 596 }
 597
 598
 599 void rgblight_effect_christmas(void) {
 600   static uint16_t current_offset = 0;
 601   static uint16_t last_timer = 0;
 602   uint16_t hue;
 603   uint8_t i;
 604   if (timer_elapsed(last_timer) < RGBLIGHT_EFFECT_CHRISTMAS_INTERVAL) {
 605     return;
 606   }
 607   last_timer = timer_read();
 608   current_offset = (current_offset + 1) % 2;
 609   for (i = 0; i < RGBLED_NUM; i++) {
 610     hue = 0 + ((i/RGBLIGHT_EFFECT_CHRISTMAS_STEP + current_offset) % 2) * 120;
 611     sethsv(hue, rgblight_config.sat, rgblight_config.val, (LED_TYPE *)&led[i]);
 612   }
 613   rgblight_set();
 614 }
 615
 616 #endif