153 lines
3.8 KiB
C
153 lines
3.8 KiB
C
/**
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* @file es2812_rainbow.c
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* @author Ondřej Hruška, 2016
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*
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* @brief Example of a rainbow effect with
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* WS2812 connected to GPIO2.
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*
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* This demo 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" // uart_set_baud
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#include <stdio.h> // printf
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#include <stdint.h>
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#include "ws2812.h"
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#define delay_ms(ms) vTaskDelay((ms) / portTICK_PERIOD_MS)
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/** GPIO number used to control the RGBs */
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static const uint8_t pin = 2;
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/**
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* @brief "rainbow" animation with a single RGB led.
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*/
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void demo_single(void)
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{
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// duration between color changes
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const uint8_t delay = 25;
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ws2812_rgb_t x = {.num = 0xFF0000}; // RED color
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while (1) {
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// iterate through the spectrum
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// note: This would be _WAY_ easier with HSL
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while(x.g < 0xFF) { x.g++; ws2812_set(pin, x.num); delay_ms(delay); } // R->RG
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while(x.r > 0x00) { x.r--; ws2812_set(pin, x.num); delay_ms(delay); } // RG->G
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while(x.b < 0xFF) { x.b++; ws2812_set(pin, x.num); delay_ms(delay); } // G->GB
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while(x.g > 0x00) { x.g--; ws2812_set(pin, x.num); delay_ms(delay); } // GB->B
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while(x.r < 0xFF) { x.r++; ws2812_set(pin, x.num); delay_ms(delay); } // B->BR
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while(x.b > 0x00) { x.b--; ws2812_set(pin, x.num); delay_ms(delay); } // BR->R
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}
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}
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/**
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* @brief "rainbow" effect on a RGB strip (30 pixels - can be adjusted)
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*
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* This example shows how to use the "procedural generation" of colors.
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*
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* The pixel colors are calculated on the fly, which saves RAM
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* (especially with large displays).
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*/
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void demo_strip(void *pvParameters)
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{
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const uint8_t anim_step = 10;
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const uint8_t anim_max = 250;
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// Number of your "pixels"
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const uint8_t pixel_count = 30;
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// duration between color changes
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const uint8_t delay = 25;
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ws2812_rgb_t color = WS2812_RGB(anim_max, 0, 0);
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uint8_t step = 0;
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ws2812_rgb_t color2 = WS2812_RGB(anim_max, 0, 0);
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uint8_t step2 = 0;
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while (1) {
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color = color2;
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step = step2;
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// Start a data sequence (disables interrupts)
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ws2812_seq_start();
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for (uint8_t i = 0; i < pixel_count; i++) {
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// send a color
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ws2812_seq_rgb(pin, color.num);
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// now we have a few hundred nanoseconds
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// to calculate the next color
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if (i == 1) {
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color2 = color;
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step2 = step;
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}
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switch (step) {
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case 0: color.g += anim_step; if (color.g >= anim_max) step++; break;
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case 1: color.r -= anim_step; if (color.r == 0) step++; break;
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case 2: color.b += anim_step; if (color.b >= anim_max) step++; break;
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case 3: color.g -= anim_step; if (color.g == 0) step++; break;
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case 4: color.r += anim_step; if (color.r >= anim_max) step++; break;
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case 5: color.b -= anim_step; if (color.b == 0) step = 0; break;
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}
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}
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// End the data sequence, display colors (interrupts are restored)
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ws2812_seq_end();
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// wait a bit
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delay_ms(delay);
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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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printf("--- RGB Rainbow demo ---");
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// Configure the GPIO
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gpio_enable(pin, GPIO_OUTPUT);
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// Select a demo function:
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#if true
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# define demo demo_strip
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#else
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# define demo demo_single
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#endif
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// Choose how to run it:
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#if true
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// Blocking function - works OK, because WiFi isn't
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// initialized yet & we're hogging the CPU.
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printf("Starting a blocking function.\r\n");
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demo(NULL);
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#else
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// Start a task. This is a real-life example,
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// notice the glitches due to NMI.
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printf("Starting a task. There may be glitches!\r\n");
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xTaskCreate(&demo, "strip demo", 256, NULL, 10, NULL);
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#endif
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}
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