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基础知识点请查阅:ESP32-C3入门教程 基础篇①——基于VS Code构建Hello World
peripherals
—>rmt
—>led_strip
menuconfig
配置ESP32C3-Specific
—>Rec 0
ESP32-C3(Built-in USB JTAG)
ESP-IDF Build, Flash and Monitor
(左下角)ESP32-C3入门教程 基础篇⑧——WS2812 全彩RGB LED灯带2
从硬件原理图中可以看出来
RGB LED
是通过GPIO8
来控制RGB LED
是SK68XXMINI-HS
SK68XXMINI
不熟悉,但是对WS2812
熟悉SK68XXMINI
和WS2812
其实是一个东西,控制原理是一样的RMT 是 Remote Control 的简称。由于RMT模块的灵活性,驱动器还可用于生成或接收许多其他类型的信号。
WS2812是一个数字RGB LED,其定义的协议数据格式与RMT外围设备中的协议数据格式兼容。
rmt_config
rmt_mode = RMT_MODE_TX
输出模式channel
通道号gpio_num
GPIO口rmt_driver_install
channel
通道号rx_buf_size = 0
接收缓存大小intr_alloc_flags = 0
LED_STRIP_DEFAULT_CONFIG
max_leds
最大LED个数dev
设备手柄,即RMT通道号的地址led_strip_new_rmt_ws2812
led_strip_config_t
led_strip配置参数esp_err_t (*set_pixel)(led_strip_t *strip, uint32_t index, uint32_t red, uint32_t green, uint32_t blue);
为特定像素设置RGBesp_err_t (*refresh)(led_strip_t *strip, uint32_t timeout_ms);
刷新LEDs颜色esp_err_t (*clear)(led_strip_t *strip, uint32_t timeout_ms);
关闭所有LEDsesp_err_t (*del)(led_strip_t *strip);
释放LEDs所有资源strip->set_pixel(strip, j, red, green, blue)
设置RGB进去到第j个LEDstrip->refresh(strip, 100)
刷新LED的颜色strip->clear(strip, 50);
关闭所有LEDsvoid 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;
}
}
我感觉这个效果在我这个开发板上面效果不咋地,所以我做了如下优化
#define EXAMPLE_RMT_TX_GPIO 8
#define EXAMPLE_STRIP_LED_NUMBER 1
改动后效果如下:
ESP32-C3入门教程 基础篇⑧——WS2812 全彩RGB LED灯带3
改动代码如下:
#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 (1000)
#define EXAMPLE_RMT_TX_GPIO 8
#define EXAMPLE_STRIP_LED_NUMBER 1
void app_main(void)
{
rmt_config_t config = RMT_DEFAULT_CONFIG_TX(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(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) {
strip->set_pixel(strip, 0, 255, 0, 0);
strip->refresh(strip, 50);
vTaskDelay(pdMS_TO_TICKS(EXAMPLE_CHASE_SPEED_MS));
strip->set_pixel(strip, 0, 0, 255, 0);
strip->refresh(strip, 50);
vTaskDelay(pdMS_TO_TICKS(EXAMPLE_CHASE_SPEED_MS));
strip->set_pixel(strip, 0, 0, 0, 255);
strip->refresh(strip, 50);
vTaskDelay(pdMS_TO_TICKS(EXAMPLE_CHASE_SPEED_MS));
}
}
\esp-idf\components\driver\include\driver\rmt.h
/**
* @brief Data struct of RMT configure parameters
*/
typedef struct {
rmt_mode_t rmt_mode; /*!< RMT mode: transmitter or receiver */
rmt_channel_t channel; /*!< RMT channel */
gpio_num_t gpio_num; /*!< RMT GPIO number */
uint8_t clk_div; /*!< RMT channel counter divider */
uint8_t mem_block_num; /*!< RMT memory block number */
uint32_t flags; /*!< RMT channel extra configurations, OR'd with RMT_CHANNEL_FLAGS_[*] */
union {
rmt_tx_config_t tx_config; /*!< RMT TX parameter */
rmt_rx_config_t rx_config; /*!< RMT RX parameter */
};
} rmt_config_t;
/**
* @brief Default configuration for Tx channel
*
*/
#define RMT_DEFAULT_CONFIG_TX(gpio, channel_id) \
{
\
.rmt_mode = RMT_MODE_TX, \
.channel = channel_id, \
.gpio_num = gpio, \
.clk_div = 80, \
.mem_block_num = 1, \
.flags = 0, \
.tx_config = {
\
.carrier_freq_hz = 38000, \
.carrier_level = RMT_CARRIER_LEVEL_HIGH, \
.idle_level = RMT_IDLE_LEVEL_LOW, \
.carrier_duty_percent = 33, \
.carrier_en = false, \
.loop_en = false, \
.idle_output_en = true, \
} \
}
components\driver\rmt.c
esp_err_t rmt_config(const rmt_config_t *rmt_param)
esp_err_t rmt_driver_install(rmt_channel_t channel, size_t rx_buf_size, int intr_alloc_flags)
\components\led_strip\include\led_strip.h
/**
* @brief LED Strip Configuration Type
*
*/
typedef struct {
uint32_t max_leds; /*!< Maximum LEDs in a single strip */
led_strip_dev_t dev; /*!< LED strip device (e.g. RMT channel, PWM channel, etc) */
} led_strip_config_t;
/**
* @brief Declare of LED Strip Type
*
*/
struct led_strip_s {
/**
* @brief Set RGB for a specific pixel
*
* @param strip: LED strip
* @param index: index of pixel to set
* @param red: red part of color
* @param green: green part of color
* @param blue: blue part of color
*
* @return
* - ESP_OK: Set RGB for a specific pixel successfully
* - ESP_ERR_INVALID_ARG: Set RGB for a specific pixel failed because of invalid parameters
* - ESP_FAIL: Set RGB for a specific pixel failed because other error occurred
*/
esp_err_t (*set_pixel)(led_strip_t *strip, uint32_t index, uint32_t red, uint32_t green, uint32_t blue);
/**
* @brief Refresh memory colors to LEDs
*
* @param strip: LED strip
* @param timeout_ms: timeout value for refreshing task
*
* @return
* - ESP_OK: Refresh successfully
* - ESP_ERR_TIMEOUT: Refresh failed because of timeout
* - ESP_FAIL: Refresh failed because some other error occurred
*
* @note:
* After updating the LED colors in the memory, a following invocation of this API is needed to flush colors to strip.
*/
esp_err_t (*refresh)(led_strip_t *strip, uint32_t timeout_ms);
/**
* @brief Clear LED strip (turn off all LEDs)
*
* @param strip: LED strip
* @param timeout_ms: timeout value for clearing task
*
* @return
* - ESP_OK: Clear LEDs successfully
* - ESP_ERR_TIMEOUT: Clear LEDs failed because of timeout
* - ESP_FAIL: Clear LEDs failed because some other error occurred
*/
esp_err_t (*clear)(led_strip_t *strip, uint32_t timeout_ms);
/**
* @brief Free LED strip resources
*
* @param strip: LED strip
*
* @return
* - ESP_OK: Free resources successfully
* - ESP_FAIL: Free resources failed because error occurred
*/
esp_err_t (*del)(led_strip_t *strip);
};
Remote Control (RMT) - ESP32-C2 - —— ESP-IDF编程指南
觉得好,就一键三连呗(点赞+收藏+关注)