Question

我想使用RX中断从我的ESP2866通过UART接收数据，所以我不需要轮询数据。

代码工作正常，我可以在调试时看到rx_buffer中的响应，但是如何检查我的ESP何时完成发送？

ESP发送的最后一个字符是\ r \ n但是它在传输过程中也会这样做几次，所以我不能真正依赖它。

我知道我应该以某种方式检查缓冲区中的'\ 0'终止符，但处理程序在收到最后一个字符时停止。因此在处理程序中检查'\ 0'不起作用。

这可能是我想念的一些简单但我希望有人可以帮助我。

int main(void)
{
  /* USER CODE BEGIN 1 */
    char* msg = "AT+GMR\r\n";
  /* USER CODE END 1 */

  /* MCU Configuration----------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_USART2_UART_Init();
  MX_USART1_UART_Init();

  /* Initialize interrupts */
  MX_NVIC_Init();
  /* USER CODE BEGIN 2 */

    // Send AT+GMR to ESP module
    HAL_UART_Transmit(&huart1, (uint8_t *)msg, strlen(msg) + 1, HAL_MAX_DELAY); 

    // Receive character (1 byte)
    HAL_UART_Receive_IT(&huart1, &rx_data, 1);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */


  while (1)
  {

  /* USER CODE END WHILE */
  /* USER CODE BEGIN 3 */

  }
  /* USER CODE END 3 */

}

/**
  * @brief  Retargets the C library printf function to the USART.
  * @param  None
  * @retval None
  */
PUTCHAR_PROTOTYPE
{
  /* Place your implementation of fputc here */
  /* e.g. write a character to the EVAL_COM1 and Loop until the end of transmission */
  HAL_UART_Transmit(&huart2, (uint8_t *)&ch, 1, HAL_MAX_DELAY); 

  return ch;
}

GETCHAR_PROTOTYPE
{
  /* Place your implementation of fgetc here */
  /* e.g. write a character to the EVAL_COM1 and Loop until the end of transmission */
    char ch;
    HAL_UART_Receive(&huart2,(uint8_t*)&ch,1, HAL_MAX_DELAY);
  return ch;
}

/**
  * @brief  Rx Transfer completed callback
  * @param  UartHandle: UART handle
  * @note   This example shows a simple way to report end of DMA Rx transfer, and 
  *         you can add your own implementation.
  * @retval None
  */
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{  
    if(huart->Instance == USART1){

        if(rx_index == 0){
            memset(&rx_buffer, 0, sizeof(rx_buffer));
        }

        rx_buffer[rx_index] = rx_data;      

        if(rx_buffer[rx_index] == '\0'){
            printf("%s", rx_buffer);
        }

        rx_index++;

        // Receive next character (1 byte)
        HAL_UART_Receive_IT(&huart1, &rx_data, 1);

    }
}

Answer 1

当您考虑 size of 和 char* msg = "AT+GMR\r\n"; 时，它自己将 \0 视为一个字符。

因此您无需在 +1 函数中添加 Transmit。

UART接收中断检查数据结束

1 个答案: