ws2812 sample
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Outline
#include <stdio.h>
#include <stdlib.h>
#include "pico/stdlib.h"
#include "hardware/pio.h"
#include "hardware/clocks.h"
#include "ws2812.pio.h"
#define IS_RGBW
#define NUM_PIXELS
#define WS2812_PIN
#define WS2812_PIN
put_pixel(uint32_t)
urgb_u32(uint8_t, uint8_t, uint8_t)
urgbw_u32(uint8_t, uint8_t, uint8_t, uint8_t)
pattern_snakes(uint, uint)
pattern_random(uint, uint)
pattern_sparkle(uint, uint)
pattern_greys(uint, uint)
pattern
pattern_table
main()
Files
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SourceVuRaspberry Pi Pico SDK and Examplesws2812 samplews2812.c
 
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/** * Copyright (c) 2020 Raspberry Pi (Trading) Ltd. * * SPDX-License-Identifier: BSD-3-Clause *//* ... */ #include <stdio.h> #include <stdlib.h> #include "pico/stdlib.h" #include "hardware/pio.h" #include "hardware/clocks.h" #include "ws2812.pio.h" 6 includes /** * NOTE: * Take into consideration if your WS2812 is a RGB or RGBW variant. * * If it is RGBW, you need to set IS_RGBW to true and provide 4 bytes per * pixel (Red, Green, Blue, White) and use urgbw_u32(). * * If it is RGB, set IS_RGBW to false and provide 3 bytes per pixel (Red, * Green, Blue) and use urgb_u32(). * * When RGBW is used with urgb_u32(), the White channel will be ignored (off). * *//* ... */ #define IS_RGBW false #define NUM_PIXELS 150 #ifdef PICO_DEFAULT_WS2812_PIN #define WS2812_PIN PICO_DEFAULT_WS2812_PIN #else // default to pin 2 if the board doesn't have a default WS2812 pin defined #define WS2812_PIN 2 /* ... */#endif static inline void put_pixel(uint32_t pixel_grb) { pio_sm_put_blocking(pio0, 0, pixel_grb << 8u); }{ ... } static inline uint32_t urgb_u32(uint8_t r, uint8_t g, uint8_t b) { return ((uint32_t) (r) << 8) | ((uint32_t) (g) << 16) | (uint32_t) (b); }{ ... } static inline uint32_t urgbw_u32(uint8_t r, uint8_t g, uint8_t b, uint8_t w) { return ((uint32_t) (r) << 8) | ((uint32_t) (g) << 16) | ((uint32_t) (w) << 24) | (uint32_t) (b); }{ ... } void pattern_snakes(uint len, uint t) { for (uint i = 0; i < len; ++i) { uint x = (i + (t >> 1)) % 64; if (x < 10) put_pixel(urgb_u32(0xff, 0, 0)); else if (x >= 15 && x < 25) put_pixel(urgb_u32(0, 0xff, 0)); else if (x >= 30 && x < 40) put_pixel(urgb_u32(0, 0, 0xff)); else put_pixel(0); }for (uint i = 0; i < len; ++i) { ... } }{ ... } void pattern_random(uint len, uint t) { if (t % 8) return; for (uint i = 0; i < len; ++i) put_pixel(rand()); }{ ... } void pattern_sparkle(uint len, uint t) { if (t % 8) return; for (uint i = 0; i < len; ++i) put_pixel(rand() % 16 ? 0 : 0xffffffff); }{ ... } void pattern_greys(uint len, uint t) { uint max = 100; // let's not draw too much current! t %= max; for (uint i = 0; i < len; ++i) { put_pixel(t * 0x10101); if (++t >= max) t = 0; }for (uint i = 0; i < len; ++i) { ... } }{ ... } typedef void (*pattern)(uint len, uint t); const struct { pattern pat; const char *name; ...} pattern_table[] = { {pattern_snakes, "Snakes!"}, {pattern_random, "Random data"}, {pattern_sparkle, "Sparkles"}, {pattern_greys, "Greys"}, ...}; int main() { //set_sys_clock_48(); stdio_init_all(); printf("WS2812 Smoke Test, using pin %d", WS2812_PIN); // todo get free sm PIO pio = pio0; int sm = 0; uint offset = pio_add_program(pio, &ws2812_program); ws2812_program_init(pio, sm, offset, WS2812_PIN, 800000, IS_RGBW); int t = 0; while (1) { int pat = rand() % count_of(pattern_table); int dir = (rand() >> 30) & 1 ? 1 : -1; puts(pattern_table[pat].name); puts(dir == 1 ? "(forward)" : "(backward)"); for (int i = 0; i < 1000; ++i) { pattern_table[pat].pat(NUM_PIXELS, t); sleep_ms(10); t += dir; }for (int i = 0; i < 1000; ++i) { ... } }while (1) { ... } }{ ... }
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