ESP32-Guide/code/04.peripheral/basics/uart/main/uart.c

#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "driver/uart.h"
#include "esp_err.h"
#include "string.h"

#define TX_GPIO_NUM 17
#define RX_GPIO_NUM 16

// 配置串口3
void uart_config(void) {
    const uart_port_t uart_num = UART_NUM_2;

    uart_config_t uart_config = {
        .baud_rate = 115200,
        .data_bits = UART_DATA_8_BITS,
        .parity = UART_PARITY_DISABLE,
        .stop_bits = UART_STOP_BITS_1,
        .flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
        .rx_flow_ctrl_thresh = 122,
    };

    // 配置UART参数
    ESP_ERROR_CHECK(uart_param_config(uart_num, &uart_config));

    // 设置UART引脚
    ESP_ERROR_CHECK(uart_set_pin(uart_num, TX_GPIO_NUM, RX_GPIO_NUM, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE));

    // 安装UART驱动程序，不使用事件队列
    const int uart_buffer_size = (1024 * 2);
    ESP_ERROR_CHECK(uart_driver_install(uart_num, uart_buffer_size, 0, 0, NULL, 0));
}

// 串口发送测试
void uart_send_receive_demo(void) {
    const uart_port_t uart_num = UART_NUM_2;
    char* test_str = "This is a UART test string.\n";
    uint8_t data[128];

    // 发送数据
    uart_write_bytes(uart_num, test_str, strlen(test_str));

    while(1){
        vTaskDelay(1);
        // 等待数据接收
        int length = 0;
        ESP_ERROR_CHECK(uart_get_buffered_data_len(uart_num, (size_t*)&length));
        if(length > 0) {
            int read_len = uart_read_bytes(uart_num, data, length, pdMS_TO_TICKS(1000));
            if(read_len > 0) {
                // 输出接收到的数据
                printf("Received: %.*s\n", read_len, data);
            }
        }
    }

}


void app_main(void) {
    uart_config();
    uart_send_receive_demo();
}