aboutsummaryrefslogtreecommitdiffstats
path: root/quantum/rgblight.c
blob: 52a09817a1e46a48697bb1f6329ba64166b586ea (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
#include <avr/eeprom.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include "progmem.h"
#include "timer.h"
#include "rgblight.h"
#include "debug.h"

// Lightness curve using the CIE 1931 lightness formula
//Generated by the python script provided in http://jared.geek.nz/2013/feb/linear-led-pwm
const uint8_t DIM_CURVE[] PROGMEM = {
    0, 0, 0, 0, 0, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 2, 2, 2, 2, 2, 2,
    2, 2, 2, 3, 3, 3, 3, 3, 3, 3,
    3, 4, 4, 4, 4, 4, 4, 5, 5, 5,
    5, 5, 6, 6, 6, 6, 6, 7, 7, 7,
    7, 8, 8, 8, 8, 9, 9, 9, 10, 10,
    10, 10, 11, 11, 11, 12, 12, 12, 13, 13,
    13, 14, 14, 15, 15, 15, 16, 16, 17, 17,
    17, 18, 18, 19, 19, 20, 20, 21, 21, 22,
    22, 23, 23, 24, 24, 25, 25, 26, 26, 27,
    28, 28, 29, 29, 30, 31, 31, 32, 32, 33,
    34, 34, 35, 36, 37, 37, 38, 39, 39, 40,
    41, 42, 43, 43, 44, 45, 46, 47, 47, 48,
    49, 50, 51, 52, 53, 54, 54, 55, 56, 57,
    58, 59, 60, 61, 62, 63, 64, 65, 66, 67,
    68, 70, 71, 72, 73, 74, 75, 76, 77, 79,
    80, 81, 82, 83, 85, 86, 87, 88, 90, 91,
    92, 94, 95, 96, 98, 99, 100, 102, 103, 105,
    106, 108, 109, 110, 112, 113, 115, 116, 118, 120,
    121, 123, 124, 126, 128, 129, 131, 132, 134, 136,
    138, 139, 141, 143, 145, 146, 148, 150, 152, 154,
    155, 157, 159, 161, 163, 165, 167, 169, 171, 173,
    175, 177, 179, 181, 183, 185, 187, 189, 191, 193,
    196, 198, 200, 202, 204, 207, 209, 211, 214, 216,
    218, 220, 223, 225, 228, 230, 232, 235, 237, 240,
    242, 245, 247, 250, 252, 255,
    };

const uint8_t RGBLED_BREATHING_TABLE[] PROGMEM = {
  0, 0, 0, 0, 1, 1, 1, 2, 2, 3, 4, 5, 5, 6, 7, 9,
  10, 11, 12, 14, 15, 17, 18, 20, 21, 23, 25, 27, 29, 31, 33, 35,
  37, 40, 42, 44, 47, 49, 52, 54, 57, 59, 62, 65, 67, 70, 73, 76,
  79, 82, 85, 88, 90, 93, 97, 100, 103, 106, 109, 112, 115, 118, 121, 124,
  127, 131, 134, 137, 140, 143, 146, 149, 152, 155, 158, 162, 165, 167, 170, 173,
  176, 179, 182, 185, 188, 190, 193, 196, 198, 201, 203, 206, 208, 211, 213, 215,
  218, 220, 222, 224, 226, 228, 230, 232, 234, 235, 237, 238, 240, 241, 243, 244,
  245, 246, 248, 249, 250, 250, 251, 252, 253, 253, 254, 254, 254, 255, 255, 255,
  255, 255, 255, 255, 254, 254, 254, 253, 253, 252, 251, 250, 250, 249, 248, 246,
  245, 244, 243, 241, 240, 238, 237, 235, 234, 232, 230, 228, 226, 224, 222, 220,
  218, 215, 213, 211, 208, 206, 203, 201, 198, 196, 193, 190, 188, 185, 182, 179,
  176, 173, 170, 167, 165, 162, 158, 155, 152, 149, 146, 143, 140, 137, 134, 131,
  128, 124, 121, 118, 115, 112, 109, 106, 103, 100, 97, 93, 90, 88, 85, 82,
  79, 76, 73, 70, 67, 65, 62, 59, 57, 54, 52, 49, 47, 44, 42, 40,
  37, 35, 33, 31, 29, 27, 25, 23, 21, 20, 18, 17, 15, 14, 12, 11,
  10, 9, 7, 6, 5, 5, 4, 3, 2, 2, 1, 1, 1, 0, 0, 0
};

__attribute__ ((weak))
const uint8_t RGBLED_BREATHING_INTERVALS[] PROGMEM = {30, 20, 10, 5};
__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 = {100, 50, 20};

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;

  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(&DIM_CURVE[r]);
  g = pgm_read_byte(&DIM_CURVE[g]);
  b = pgm_read_byte(&DIM_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_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 <= 23) {
    // MODE 2-5, breathing
    // MODE 6-8, rainbow mood
    // MODE 9-14, rainbow swirl
    // MODE 15-20, snake
    // MODE 21-23, knight

    #ifdef RGBLIGHT_ANIMATIONS
      rgblight_timer_enable();
    #endif
  }
  rgblight_sethsv(rgblight_config.hue, rgblight_config.sat, rgblight_config.val);
}

void rgblight_toggle(void) {
  rgblight_config.enable ^= 1;
  eeconfig_update_rgblight(rgblight_config.raw);
  xprintf("rgblight toggle: rgblight_config.enable = %u\n", rgblight_config.enable);
  if (rgblight_config.enable) {
    rgblight_mode(rgblight_config.mode);
  } else {
    #ifdef RGBLIGHT_ANIMATIONS
      rgblight_timer_disable();
    #endif
    _delay_ms(50);
    rgblight_set();
  }
}

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_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;
      }
    }
    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);
  }
}

void rgblight_setrgb(uint8_t r, uint8_t g, uint8_t b) {
  // dprintf("rgblight set rgb: %u,%u,%u\n", r,g,b);
  for (uint8_t i = 0; i < RGBLED_NUM; i++) {
    led[i].r = r;
    led[i].g = g;
    led[i].b = b;
  }
  rgblight_set();
}

__attribute__ ((weak))
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
  }
}

#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_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);
    } 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 {
      // mode = 24, christmas mode
      rgblight_effect_christmas();
    }
  }
}

// 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_byte(&RGBLED_BREATHING_INTERVALS[interval])) {
    return;
  }
  last_timer = timer_read();

  rgblight_sethsv_noeeprom(rgblight_config.hue, rgblight_config.sat, pgm_read_byte(&RGBLED_BREATHING_TABLE[pos]));
  pos = (pos + 1) % 256;
}
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_MOOD_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 int8_t pos = 0;
  static uint16_t last_timer = 0;
  uint8_t i, j, cur;
  int8_t k;
  LED_TYPE preled[RGBLED_NUM];
  static int8_t increment = -1;
  if (timer_elapsed(last_timer) < pgm_read_byte(&RGBLED_KNIGHT_INTERVALS[interval])) {
    return;
  }
  last_timer = timer_read();
  for (i = 0; i < RGBLED_NUM; i++) {
    preled[i].r = 0;
    preled[i].g = 0;
    preled[i].b = 0;
    for (j = 0; j < RGBLIGHT_EFFECT_KNIGHT_LENGTH; j++) {
      k = pos + j * increment;
      if (k < 0) {
        k = 0;
      }
      if (k >= RGBLED_NUM) {
        k = RGBLED_NUM - 1;
      }
      if (i == k) {
        sethsv(rgblight_config.hue, rgblight_config.sat, rgblight_config.val, (LED_TYPE *)&preled[i]);
      }
    }
  }
  if (RGBLIGHT_EFFECT_KNIGHT_OFFSET) {
    for (i = 0; i < RGBLED_NUM; i++) {
      cur = (i + RGBLIGHT_EFFECT_KNIGHT_OFFSET) % RGBLED_NUM;
      led[i].r = preled[cur].r;
      led[i].g = preled[cur].g;
      led[i].b = preled[cur].b;
    }
  }
  rgblight_set();
  if (increment == 1) {
    if (pos - 1 < 0 - RGBLIGHT_EFFECT_KNIGHT_LENGTH) {
      pos = 0 - RGBLIGHT_EFFECT_KNIGHT_LENGTH;
      increment = -1;
    } else {
      pos -= 1;
    }
  } else {
    if (pos + 1 > RGBLED_NUM + RGBLIGHT_EFFECT_KNIGHT_LENGTH) {
      pos = RGBLED_NUM + RGBLIGHT_EFFECT_KNIGHT_LENGTH - 1;
      increment = 1;
    } else {
      pos += 1;
    }
  }
}


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