-
Notifications
You must be signed in to change notification settings - Fork 0
/
neopixel.cpp
538 lines (511 loc) · 25 KB
/
neopixel.cpp
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
/*-------------------------------------------------------------------------
Spark Core library to control WS2811/WS2812 based RGB
LED devices such as Adafruit NeoPixel strips.
Currently handles 800 KHz and 400kHz bitstream on Spark Core,
WS2812, WS2812B and WS2811.
Also supports:
- Radio Shack Tri-Color Strip with TM1803 controller 400kHz bitstream.
- TM1829 pixels
Written by Phil Burgess / Paint Your Dragon for Adafruit Industries.
Modified to work with Spark Core by Technobly.
Contributions by PJRC and other members of the open source community.
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing products
from Adafruit!
--------------------------------------------------------------------*/
/* ======================= Adafruit_NeoPixel.cpp ======================= */
/*-------------------------------------------------------------------------
This file is part of the Adafruit NeoPixel library.
NeoPixel is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.
NeoPixel 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with NeoPixel. If not, see
<http://www.gnu.org/licenses/>.
-------------------------------------------------------------------------*/
#include "neopixel.h"
Adafruit_NeoPixel::Adafruit_NeoPixel(uint16_t n, uint8_t p, uint8_t t) : \
numLEDs(n), numBytes(n*3), type(t), pin(p), pixels(NULL)
{
if((pixels = (uint8_t *)malloc(numBytes))) {
memset(pixels, 0, numBytes);
}
}
Adafruit_NeoPixel::~Adafruit_NeoPixel() {
if(pixels) free(pixels);
pinMode(pin, INPUT);
}
void Adafruit_NeoPixel::begin(void) {
pinMode(pin, OUTPUT);
digitalWrite(pin, LOW);
}
void Adafruit_NeoPixel::show(void) {
if(!pixels) return;
// Data latch = 24 or 50 microsecond pause in the output stream. Rather than
// put a delay at the end of the function, the ending time is noted and
// the function will simply hold off (if needed) on issuing the
// subsequent round of data until the latch time has elapsed. This
// allows the mainline code to start generating the next frame of data
// rather than stalling for the latch.
uint32_t wait_time; // wait time in microseconds.
switch(type) {
case TM1803: // TM1803 = 24us reset pulse
wait_time = 24L;
break;
case TM1829: // TM1829 = 500us reset pulse
wait_time = 500L;
break;
case WS2812B: // WS2812 & WS2812B = 50us reset pulse
case WS2811: // WS2811 = 50us reset pulse
default: // default = 50us reset pulse
wait_time = 50L;
break;
}
while((micros() - endTime) < wait_time);
// endTime is a private member (rather than global var) so that multiple
// instances on different pins can be quickly issued in succession (each
// instance doesn't delay the next).
__disable_irq(); // Need 100% focus on instruction timing
volatile uint32_t
c, // 24-bit pixel color
mask; // 8-bit mask
volatile uint16_t i = numBytes; // Output loop counter
volatile uint8_t
j, // 8-bit inner loop counter
*ptr = pixels, // Pointer to next byte
g, // Current green byte value
r, // Current red byte value
b; // Current blue byte value
if(type == WS2812B) { // same as WS2812, 800 KHz bitstream
while(i) { // While bytes left... (3 bytes = 1 pixel)
mask = 0x800000; // reset the mask
i = i-3; // decrement bytes remaining
g = *ptr++; // Next green byte value
r = *ptr++; // Next red byte value
b = *ptr++; // Next blue byte value
c = ((uint32_t)g << 16) | ((uint32_t)r << 8) | b; // Pack the next 3 bytes to keep timing tight
j = 0; // reset the 24-bit counter
do {
PIN_MAP[pin].gpio_peripheral->BSRR = PIN_MAP[pin].gpio_pin; // HIGH
if (c & mask) { // if masked bit is high
// WS2812 spec 700ns HIGH
// Adafruit on Arduino (meas. 812ns)
// This lib on Spark Core (meas. 792ns)
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t"
::: "r0", "cc", "memory");
// WS2812 spec 600ns LOW
// Adafruit on Arduino (meas. 436ns)
// This lib on Spark Core (meas. 472ns)
PIN_MAP[pin].gpio_peripheral->BRR = PIN_MAP[pin].gpio_pin; // LOW
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
::: "r0", "cc", "memory");
}
else { // else masked bit is low
// WS2812 spec 350ns HIGH
// Adafruit on Arduino (meas. 312ns)
// This lib on Spark Core (meas. 306ns)
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
::: "r0", "cc", "memory");
// WS2812 spec 800ns LOW
// Adafruit on Arduino (meas. 938ns)
// This lib on Spark Core (meas. 932ns)
PIN_MAP[pin].gpio_peripheral->BRR = PIN_MAP[pin].gpio_pin; // LOW
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
::: "r0", "cc", "memory");
}
mask >>= 1;
} while ( ++j < 24 ); // ... pixel done
} // end while(i) ... no more pixels
}
else if(type == WS2811) { // WS2811, 400 KHz bitstream
while(i) { // While bytes left... (3 bytes = 1 pixel)
mask = 0x800000; // reset the mask
i = i-3; // decrement bytes remaining
r = *ptr++; // Next red byte value
g = *ptr++; // Next green byte value
b = *ptr++; // Next blue byte value
c = ((uint32_t)r << 16) | ((uint32_t)g << 8) | b; // Pack the next 3 bytes to keep timing tight
j = 0; // reset the 24-bit counter
do {
PIN_MAP[pin].gpio_peripheral->BSRR = PIN_MAP[pin].gpio_pin; // HIGH
if (c & mask) { // if masked bit is high
// WS2811 spec 1.20us HIGH
// Adafruit on Arduino (meas. 1.25us)
// This lib on Spark Core (meas. 1.25us)
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
::: "r0", "cc", "memory");
// WS2811 spec 1.30us LOW
// Adafruit on Arduino (meas. 1.25us)
// This lib on Spark Core (meas. 1.25us)
PIN_MAP[pin].gpio_peripheral->BRR = PIN_MAP[pin].gpio_pin; // LOW
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
::: "r0", "cc", "memory");
}
else { // else masked bit is low
// WS2811 spec 500ns HIGH
// Adafruit on Arduino (meas. 500ns)
// This lib on Spark Core (meas. 500ns)
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
::: "r0", "cc", "memory");
// WS2811 spec 2.000us LOW
// Adafruit on Arduino (meas. 2.000us)
// This lib on Spark Core (meas. 2.000us)
PIN_MAP[pin].gpio_peripheral->BRR = PIN_MAP[pin].gpio_pin; // LOW
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
::: "r0", "cc", "memory");
}
mask >>= 1;
} while ( ++j < 24 ); // ... pixel done
} // end while(i) ... no more pixels
}
else if(type == TM1803) { // TM1803 (Radio Shack Tri-Color Strip), 400 KHz bitstream
while(i) { // While bytes left... (3 bytes = 1 pixel)
mask = 0x800000; // reset the mask
i = i-3; // decrement bytes remaining
r = *ptr++; // Next green byte value
g = *ptr++; // Next red byte value
b = *ptr++; // Next blue byte value
c = ((uint32_t)r << 16) | ((uint32_t)g << 8) | b; // Pack the next 3 bytes to keep timing tight
j = 0; // reset the 24-bit counter
do {
PIN_MAP[pin].gpio_peripheral->BSRR = PIN_MAP[pin].gpio_pin; // HIGH
if (c & mask) { // if masked bit is high
// TM1803 spec 1.36us HIGH
// Pololu on Arduino (meas. 1.31us)
// This lib on Spark Core (meas. 1.36us)
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
::: "r0", "cc", "memory");
// TM1803 spec 680ns LOW
// Pololu on Arduino (meas. 1.024us)
// This lib on Spark Core (meas. 670ns)
PIN_MAP[pin].gpio_peripheral->BRR = PIN_MAP[pin].gpio_pin; // LOW
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
::: "r0", "cc", "memory");
}
else { // else masked bit is low
// TM1803 spec 680ns HIGH
// Pololu on Arduino (meas. 374ns)
// This lib on Spark Core (meas. 680ns)
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
::: "r0", "cc", "memory");
// TM1803 spec 1.36us LOW
// Pololu on Arduino (meas. 2.00us)
// This lib on Spark Core (meas. 1.36us)
PIN_MAP[pin].gpio_peripheral->BRR = PIN_MAP[pin].gpio_pin; // LOW
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
::: "r0", "cc", "memory");
}
mask >>= 1;
} while ( ++j < 24 ); // ... pixel done
} // end while(i) ... no more pixels
}
else { // must be only other option TM1829, 800 KHz bitstream
while(i) { // While bytes left... (3 bytes = 1 pixel)
mask = 0x800000; // reset the mask
i = i-3; // decrement bytes remaining
r = *ptr++; // Next red byte value
b = *ptr++; // Next blue byte value
g = *ptr++; // Next green byte value
c = ((uint32_t)r << 16) | ((uint32_t)b << 8) | g; // Pack the next 3 bytes to keep timing tight
j = 0; // reset the 24-bit counter
PIN_MAP[pin].gpio_peripheral->BRR = PIN_MAP[pin].gpio_pin; // LOW
for( ;; ) { // ... pixel done
if (c & mask) { // if masked bit is high
// TM1829 spec 800ns LOW
// This lib on Spark Core (meas. 792ns)
mask >>= 1; // Do this task during the long delay of this bit
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
::: "r0", "cc", "memory");
j++;
// TM1829 spec 300ns HIGH
// This lib on Spark Core (meas. 319ns)
PIN_MAP[pin].gpio_peripheral->BSRR = PIN_MAP[pin].gpio_pin; // HIGH
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
::: "r0", "cc", "memory");
if(j==24) break;
PIN_MAP[pin].gpio_peripheral->BRR = PIN_MAP[pin].gpio_pin; // LOW
}
else { // else masked bit is low
// TM1829 spec 300ns LOW
// This lib on Spark Core (meas. 306ns)
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
::: "r0", "cc", "memory");
// TM1829 spec 800ns HIGH
// This lib on Spark Core (meas. 805ns)
PIN_MAP[pin].gpio_peripheral->BSRR = PIN_MAP[pin].gpio_pin; // HIGH
j++;
mask >>= 1; // Do this task during the long delay of this bit
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
::: "r0", "cc", "memory");
if(j==24) break;
PIN_MAP[pin].gpio_peripheral->BRR = PIN_MAP[pin].gpio_pin; // LOW
}
}
} // end while(i) ... no more pixels
}
__enable_irq();
endTime = micros(); // Save EOD time for latch on next call
}
// Set the output pin number
void Adafruit_NeoPixel::setPin(uint8_t p) {
pinMode(pin, INPUT);
pin = p;
pinMode(p, OUTPUT);
digitalWrite(p, LOW);
}
// Set pixel color from separate R,G,B components:
void Adafruit_NeoPixel::setPixelColor(
uint16_t n, uint8_t r, uint8_t g, uint8_t b) {
if(n < numLEDs) {
if(brightness) { // See notes in setBrightness()
r = (r * brightness) >> 8;
g = (g * brightness) >> 8;
b = (b * brightness) >> 8;
}
uint8_t *p = &pixels[n * 3];
switch(type) {
case WS2812B: // WS2812 & WS2812B is GRB order.
*p++ = g;
*p++ = r;
*p = b;
break;
case TM1829: // TM1829 is special RBG order
if(r == 255) r = 254; // 255 on RED channel causes display to be in a special mode.
*p++ = r;
*p++ = b;
*p = g;
break;
case WS2811: // WS2811 is RGB order
case TM1803: // TM1803 is RGB order
default: // default is RGB order
*p++ = r;
*p++ = g;
*p = b;
break;
}
}
}
// Set pixel color from 'packed' 32-bit RGB color:
void Adafruit_NeoPixel::setPixelColor(uint16_t n, uint32_t c) {
if(n < numLEDs) {
uint8_t
r = (uint8_t)(c >> 16),
g = (uint8_t)(c >> 8),
b = (uint8_t)c;
if(brightness) { // See notes in setBrightness()
r = (r * brightness) >> 8;
g = (g * brightness) >> 8;
b = (b * brightness) >> 8;
}
uint8_t *p = &pixels[n * 3];
switch(type) {
case WS2812B: // WS2812 & WS2812B is GRB order.
*p++ = g;
*p++ = r;
*p = b;
break;
case TM1829: // TM1829 is special RBG order
if(r == 255) r = 254; // 255 on RED channel causes display to be in a special mode.
*p++ = r;
*p++ = b;
*p = g;
break;
case WS2811: // WS2811 is RGB order
case TM1803: // TM1803 is RGB order
default: // default is RGB order
*p++ = r;
*p++ = g;
*p = b;
break;
}
}
}
// Convert separate R,G,B into packed 32-bit RGB color.
// Packed format is always RGB, regardless of LED strand color order.
uint32_t Adafruit_NeoPixel::Color(uint8_t r, uint8_t g, uint8_t b) {
return ((uint32_t)r << 16) | ((uint32_t)g << 8) | b;
}
// Query color from previously-set pixel (returns packed 32-bit RGB value)
uint32_t Adafruit_NeoPixel::getPixelColor(uint16_t n) const {
if(n < numLEDs) {
uint16_t ofs = n * 3;
return (uint32_t)(pixels[ofs + 2]) |
((uint32_t)(pixels[ofs ]) << 8) |
((uint32_t)(pixels[ofs + 1]) << 16);
}
return 0; // Pixel # is out of bounds
}
uint8_t *Adafruit_NeoPixel::getPixels(void) const {
return pixels;
}
uint16_t Adafruit_NeoPixel::numPixels(void) const {
return numLEDs;
}
// Adjust output brightness; 0=darkest (off), 255=brightest. This does
// NOT immediately affect what's currently displayed on the LEDs. The
// next call to show() will refresh the LEDs at this level. However,
// this process is potentially "lossy," especially when increasing
// brightness. The tight timing in the WS2811/WS2812 code means there
// aren't enough free cycles to perform this scaling on the fly as data
// is issued. So we make a pass through the existing color data in RAM
// and scale it (subsequent graphics commands also work at this
// brightness level). If there's a significant step up in brightness,
// the limited number of steps (quantization) in the old data will be
// quite visible in the re-scaled version. For a non-destructive
// change, you'll need to re-render the full strip data. C'est la vie.
void Adafruit_NeoPixel::setBrightness(uint8_t b) {
// Stored brightness value is different than what's passed.
// This simplifies the actual scaling math later, allowing a fast
// 8x8-bit multiply and taking the MSB. 'brightness' is a uint8_t,
// adding 1 here may (intentionally) roll over...so 0 = max brightness
// (color values are interpreted literally; no scaling), 1 = min
// brightness (off), 255 = just below max brightness.
uint8_t newBrightness = b + 1;
if(newBrightness != brightness) { // Compare against prior value
// Brightness has changed -- re-scale existing data in RAM
uint8_t c,
*ptr = pixels,
oldBrightness = brightness - 1; // De-wrap old brightness value
uint16_t scale;
if(oldBrightness == 0) scale = 0; // Avoid /0
else if(b == 255) scale = 65535 / oldBrightness;
else scale = (((uint16_t)newBrightness << 8) - 1) / oldBrightness;
for(uint16_t i=0; i<numBytes; i++) {
c = *ptr;
*ptr++ = (c * scale) >> 8;
}
brightness = newBrightness;
}
}