84 lines
2 KiB
C
84 lines
2 KiB
C
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/**
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* Example of ws2812_i2s library usage.
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*
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* This example shows light that travels in circle with fading tail.
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* As ws2812_i2s library using hardware I2S the output pin is GPIO3 and
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* can not be changed.
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*
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* This sample code is in the public domain.,
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*/
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#include "espressif/esp_common.h"
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#include "FreeRTOS.h"
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#include "task.h"
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#include "esp/uart.h"
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#include <stdint.h>
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#include <string.h>
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#include <stdlib.h>
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#include "ws2812_i2s/ws2812_i2s.h"
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const uint32_t led_number = 60;
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const uint32_t tail_fade_factor = 2;
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const uint32_t tail_length = 8;
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static void fade_pixel(ws2812_pixel_t *pixel, uint32_t factor)
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{
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pixel->red = pixel->red / factor;
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pixel->green = pixel->green / factor;
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pixel->blue = pixel->blue / factor;
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}
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static int fix_index(int index)
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{
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if (index < 0) {
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return (int)led_number + index;
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} else if (index >= led_number) {
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return index - led_number;
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} else {
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return index;
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}
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}
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static ws2812_pixel_t next_colour()
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{
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ws2812_pixel_t colour = {0, 0, 0};
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colour.red = rand() % 256;
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colour.green = rand() % 256;
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colour.blue = rand() % 256;
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return colour;
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}
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static void demo(void *pvParameters)
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{
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ws2812_pixel_t pixels[led_number];
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int head_index = 0;
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ws2812_i2s_init(led_number);
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memset(pixels, 0, sizeof(ws2812_pixel_t) * led_number);
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while (1) {
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pixels[head_index] = next_colour();
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for (int i = 0; i < led_number; i++) {
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head_index = fix_index(head_index + 1);
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pixels[head_index] = pixels[fix_index(head_index-1)];
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for (int ii = 1; ii < tail_length; ii++) {
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fade_pixel(&pixels[fix_index(head_index - ii)], tail_fade_factor);
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}
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memset(&pixels[fix_index(head_index - tail_length)], 0,
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sizeof(ws2812_pixel_t));
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ws2812_i2s_update(pixels);
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vTaskDelay(20 / portTICK_RATE_MS);
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}
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}
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}
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void user_init(void)
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{
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uart_set_baud(0, 115200);
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xTaskCreate(&demo, (signed char *)"ws2812_i2s", 256, NULL, 10, NULL);
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}
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