[嵌入式]【ESP32S3系列】1、使用ESP32S3开发板点亮WS2812

开发板链接：ESP32-S3 LVGL 开发板BLE人工智能语音人脸识别触摸 音频芯片wifi-淘宝网 (taobao.com)

板子上的LED是WS2812，它的引脚分别是：

VDD：电源，3.5V～5.3V

VSS：地

DIN：数据输入

DOUT：数据输出

WS2812可以像贪吃蛇一样无限延长下去，但板子上只有一个

我们可以在ESP-IDF中找到驱动代码，直接使用即可，需要把IO改为IO38：

/* RMT example -- RGB LED Strip

   This example code is in the Public Domain (or CC0 licensed, at your option.)

   Unless required by applicable law or agreed to in writing, this
   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, either express or implied.
*/
#include "sdkconfig.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_log.h"
#include "driver/rmt.h"
#include "led_strip.h"

static const char *TAG = "example";

#define RMT_TX_CHANNEL RMT_CHANNEL_0

#define EXAMPLE_CHASE_SPEED_MS (80)

/**
 * @brief Simple helper function, converting HSV color space to RGB color space
 *
 * Wiki: https://en.wikipedia.org/wiki/HSL_and_HSV
 *
 */
void led_strip_hsv2rgb(uint32_t h, uint32_t s, uint32_t v, uint32_t *r, uint32_t *g, uint32_t *b)
{
    h %= 360; // h -> [0,360]
    uint32_t rgb_max = v * 2.55f;
    uint32_t rgb_min = rgb_max * (100 - s) / 100.0f;

    uint32_t i = h / 60;
    uint32_t diff = h % 60;

    // RGB adjustment amount by hue
    uint32_t rgb_adj = (rgb_max - rgb_min) * diff / 60;

    switch (i) {
    case 0:
        *r = rgb_max;
        *g = rgb_min + rgb_adj;
        *b = rgb_min;
        break;
    case 1:
        *r = rgb_max - rgb_adj;
        *g = rgb_max;
        *b = rgb_min;
        break;
    case 2:
        *r = rgb_min;
        *g = rgb_max;
        *b = rgb_min + rgb_adj;
        break;
    case 3:
        *r = rgb_min;
        *g = rgb_max - rgb_adj;
        *b = rgb_max;
        break;
    case 4:
        *r = rgb_min + rgb_adj;
        *g = rgb_min;
        *b = rgb_max;
        break;
    default:
        *r = rgb_max;
        *g = rgb_min;
        *b = rgb_max - rgb_adj;
        break;
    }
}

void app_main(void)
{
    uint32_t red = 0;
    uint32_t green = 0;
    uint32_t blue = 0;
    uint16_t hue = 0;
    uint16_t start_rgb = 0;

    rmt_config_t config = RMT_DEFAULT_CONFIG_TX(CONFIG_EXAMPLE_RMT_TX_GPIO, RMT_TX_CHANNEL);
    // set counter clock to 40MHz
    config.clk_div = 2;

    ESP_ERROR_CHECK(rmt_config(&config));
    ESP_ERROR_CHECK(rmt_driver_install(config.channel, 0, 0));

    // install ws2812 driver
    led_strip_config_t strip_config = LED_STRIP_DEFAULT_CONFIG(CONFIG_EXAMPLE_STRIP_LED_NUMBER, (led_strip_dev_t)config.channel);
    led_strip_t *strip = led_strip_new_rmt_ws2812(&strip_config);
    if (!strip) {
        ESP_LOGE(TAG, "install WS2812 driver failed");
    }
    // Clear LED strip (turn off all LEDs)
    ESP_ERROR_CHECK(strip->clear(strip, 100));
    // Show simple rainbow chasing pattern
    ESP_LOGI(TAG, "LED Rainbow Chase Start");
    while (true) {
        for (int i = 0; i < 3; i++) {
            for (int j = i; j < CONFIG_EXAMPLE_STRIP_LED_NUMBER; j += 3) {
                // Build RGB values
                hue = j * 360 / CONFIG_EXAMPLE_STRIP_LED_NUMBER + start_rgb;
                led_strip_hsv2rgb(hue, 100, 100, &red, &green, &blue);
                // Write RGB values to strip driver
                ESP_ERROR_CHECK(strip->set_pixel(strip, j, red, green, blue));
            }
            // Flush RGB values to LEDs
            ESP_ERROR_CHECK(strip->refresh(strip, 100));
            vTaskDelay(pdMS_TO_TICKS(EXAMPLE_CHASE_SPEED_MS));
            // strip->clear(strip, 50);
            // vTaskDelay(pdMS_TO_TICKS(EXAMPLE_CHASE_SPEED_MS));
        }
        start_rgb += 60;
    }
}

最后在Powershell中编译下载运行