esp32运行的第一个程序（串口回环测试）

1、串口回环测试（电脑串口发送数据，原数据返回）

代码如下

/*串口初始化

 * */

void Uart0_Init()

{

/* Configure parameters of an UART driver,

* communication pins and install the driver */

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

  };

uart_param_config(UART_NUM_0, &uart_config);

uart_set_pin(UART_NUM_0, ECHO_TEST_TXD, ECHO_TEST_RXD, ECHO_TEST_RTS, ECHO_TEST_CTS);

uart_driver_install(UART_NUM_0, BUF_SIZE * 2, 0, 0, NULL, 0);

}

static void echo_task()

{

uint8_t *data = (uint8_t *) malloc(BUF_SIZE);

  while (1) {

   // Read data from the UART

   int len = uart_read_bytes(UART_NUM_0, data, BUF_SIZE, 20 / portTICK_RATE_MS);

   // Write data back to the UART

   uart_write_bytes(UART_NUM_0, (const char *) data, len);

  }

}

例程2解析：串口事件处理

1、初始化串口