blob: 1ed87c4381e8c113b69302b6f0fb85561809bf2e (
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
|
#include "ws2812.h"
#include "gpio.h"
#include "chibios_config.h"
// DEPRECATED - DO NOT USE
#if defined(NOP_FUDGE)
# define WS2812_BITBANG_NOP_FUDGE NOP_FUDGE
#endif
/* Adapted from https://github.com/bigjosh/SimpleNeoPixelDemo/ */
#ifndef WS2812_BITBANG_NOP_FUDGE
# if defined(STM32F0XX) || defined(STM32F1XX) || defined(GD32VF103) || defined(STM32F3XX) || defined(STM32F4XX) || defined(STM32L0XX) || defined(WB32F3G71xx) || defined(WB32FQ95xx)
# define WS2812_BITBANG_NOP_FUDGE 0.4
# else
# if defined(RP2040)
# error "Please use `vendor` WS2812 driver for RP2040"
# else
# error "WS2812_BITBANG_NOP_FUDGE configuration required"
# endif
# define WS2812_BITBANG_NOP_FUDGE 1 // this just pleases the compile so the above error is easier to spot
# endif
#endif
// Push Pull or Open Drain Configuration
// Default Push Pull
#ifndef WS2812_EXTERNAL_PULLUP
# define WS2812_OUTPUT_MODE PAL_MODE_OUTPUT_PUSHPULL
#else
# define WS2812_OUTPUT_MODE PAL_MODE_OUTPUT_OPENDRAIN
#endif
// The reset gap can be 6000 ns, but depending on the LED strip it may have to be increased
// to values like 600000 ns. If it is too small, the pixels will show nothing most of the time.
#ifndef WS2812_RES
# define WS2812_RES (1000 * WS2812_TRST_US) // Width of the low gap between bits to cause a frame to latch
#endif
#define NUMBER_NOPS 6
#define CYCLES_PER_SEC (CPU_CLOCK / NUMBER_NOPS * WS2812_BITBANG_NOP_FUDGE)
#define NS_PER_SEC (1000000000L) // Note that this has to be SIGNED since we want to be able to check for negative values of derivatives
#define NS_PER_CYCLE (NS_PER_SEC / CYCLES_PER_SEC)
#define NS_TO_CYCLES(n) ((n) / NS_PER_CYCLE)
#define wait_ns(x) \
do { \
for (int i = 0; i < NS_TO_CYCLES(x); i++) { \
__asm__ volatile("nop\n\t" \
"nop\n\t" \
"nop\n\t" \
"nop\n\t" \
"nop\n\t" \
"nop\n\t"); \
} \
} while (0)
void sendByte(uint8_t byte) {
// WS2812 protocol wants most significant bits first
for (unsigned char bit = 0; bit < 8; bit++) {
bool is_one = byte & (1 << (7 - bit));
// using something like wait_ns(is_one ? T1L : T0L) here throws off timings
if (is_one) {
// 1
gpio_write_pin_high(WS2812_DI_PIN);
wait_ns(WS2812_T1H);
gpio_write_pin_low(WS2812_DI_PIN);
wait_ns(WS2812_T1L);
} else {
// 0
gpio_write_pin_high(WS2812_DI_PIN);
wait_ns(WS2812_T0H);
gpio_write_pin_low(WS2812_DI_PIN);
wait_ns(WS2812_T0L);
}
}
}
void ws2812_init(void) {
palSetLineMode(WS2812_DI_PIN, WS2812_OUTPUT_MODE);
}
// Setleds for standard RGB
void ws2812_setleds(rgb_led_t *ledarray, uint16_t leds) {
static bool s_init = false;
if (!s_init) {
ws2812_init();
s_init = true;
}
// this code is very time dependent, so we need to disable interrupts
chSysLock();
for (uint8_t i = 0; i < leds; i++) {
// WS2812 protocol dictates grb order
#if (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_GRB)
sendByte(ledarray[i].g);
sendByte(ledarray[i].r);
sendByte(ledarray[i].b);
#elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_RGB)
sendByte(ledarray[i].r);
sendByte(ledarray[i].g);
sendByte(ledarray[i].b);
#elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_BGR)
sendByte(ledarray[i].b);
sendByte(ledarray[i].g);
sendByte(ledarray[i].r);
#endif
#ifdef RGBW
sendByte(ledarray[i].w);
#endif
}
wait_ns(WS2812_RES);
chSysUnlock();
}
|
