STM32 USART LL中断

我正在使用NUCLEO-L053R8板通过USART与外围设备通信。我开始发送工作正常的命令。外围设备将数据传输到相应的设备。成功发送命令后，设备会在接收线上显示一条消息，如下所示。

现在我想接收这两条消息并分析它们。因此，我尝试使用中断功能

我用CubeMX初始化了我的USART，如下所示：

static void MX_USART1_UART_Init(void)
{

  /* USER CODE BEGIN USART1_Init 0 */

  /* USER CODE END USART1_Init 0 */

  LL_USART_InitTypeDef USART_InitStruct = {0};

  LL_GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* Peripheral clock enable */
  LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_USART1);

  LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOA);
  /**USART1 GPIO Configuration
  PA9   ------> USART1_TX
  PA10   ------> USART1_RX
  */
  GPIO_InitStruct.Pin = LL_GPIO_PIN_9;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_VERY_HIGH;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
  GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
  GPIO_InitStruct.Alternate = LL_GPIO_AF_4;
  LL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  GPIO_InitStruct.Pin = LL_GPIO_PIN_10;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_VERY_HIGH;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
  GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
  GPIO_InitStruct.Alternate = LL_GPIO_AF_4;
  LL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* USART1 interrupt Init */
  NVIC_SetPriority(USART1_IRQn, 0);
  NVIC_EnableIRQ(USART1_IRQn);

  /* USER CODE BEGIN USART1_Init 1 */

  /* USER CODE END USART1_Init 1 */
  USART_InitStruct.BaudRate = 115200;
  USART_InitStruct.DataWidth = LL_USART_DATAWIDTH_8B;
  USART_InitStruct.StopBits = LL_USART_STOPBITS_1;
  USART_InitStruct.Parity = LL_USART_PARITY_NONE;
  USART_InitStruct.TransferDirection = LL_USART_DIRECTION_TX_RX;
  USART_InitStruct.HardwareFlowControl = LL_USART_HWCONTROL_NONE;
  USART_InitStruct.OverSampling = LL_USART_OVERSAMPLING_16;
  LL_USART_Init(USART1, &USART_InitStruct);
  LL_USART_ConfigAsyncMode(USART1);
  LL_USART_Enable(USART1);
  /* USER CODE BEGIN USART1_Init 2 */

  /* USER CODE END USART1_Init 2 */

}

void USART1_IRQHandler(void)
{
  /* USER CODE BEGIN USART1_IRQn 0 */

  /* USER CODE END USART1_IRQn 0 */

  /* USER CODE BEGIN USART1_IRQn 1 */
    
      /* Check RXNE flag value in SR register */
  if(LL_USART_IsActiveFlag_RXNE(USART1) && LL_USART_IsEnabledIT_RXNE(USART1))
  {
    /* RXNE flag will be cleared by reading of DR register (done in call) */
    /* Call function in charge of handling Character reception */
    USART_CharReception_Callback();
  }
  /* USER CODE END USART1_IRQn 1 */
}

在我的stm32l0xx_it.c文件中，我更改了ISR，如下所示：

static void MX_USART1_UART_Init(void)
{

  /* USER CODE BEGIN USART1_Init 0 */

  /* USER CODE END USART1_Init 0 */

  LL_USART_InitTypeDef USART_InitStruct = {0};

  LL_GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* Peripheral clock enable */
  LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_USART1);

  LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOA);
  /**USART1 GPIO Configuration
  PA9   ------> USART1_TX
  PA10   ------> USART1_RX
  */
  GPIO_InitStruct.Pin = LL_GPIO_PIN_9;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_VERY_HIGH;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
  GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
  GPIO_InitStruct.Alternate = LL_GPIO_AF_4;
  LL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  GPIO_InitStruct.Pin = LL_GPIO_PIN_10;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_VERY_HIGH;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
  GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
  GPIO_InitStruct.Alternate = LL_GPIO_AF_4;
  LL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* USART1 interrupt Init */
  NVIC_SetPriority(USART1_IRQn, 0);
  NVIC_EnableIRQ(USART1_IRQn);

  /* USER CODE BEGIN USART1_Init 1 */

  /* USER CODE END USART1_Init 1 */
  USART_InitStruct.BaudRate = 115200;
  USART_InitStruct.DataWidth = LL_USART_DATAWIDTH_8B;
  USART_InitStruct.StopBits = LL_USART_STOPBITS_1;
  USART_InitStruct.Parity = LL_USART_PARITY_NONE;
  USART_InitStruct.TransferDirection = LL_USART_DIRECTION_TX_RX;
  USART_InitStruct.HardwareFlowControl = LL_USART_HWCONTROL_NONE;
  USART_InitStruct.OverSampling = LL_USART_OVERSAMPLING_16;
  LL_USART_Init(USART1, &USART_InitStruct);
  LL_USART_ConfigAsyncMode(USART1);
  LL_USART_Enable(USART1);
  /* USER CODE BEGIN USART1_Init 2 */

  /* USER CODE END USART1_Init 2 */

}

void USART1_IRQHandler(void)
{
  /* USER CODE BEGIN USART1_IRQn 0 */

  /* USER CODE END USART1_IRQn 0 */

  /* USER CODE BEGIN USART1_IRQn 1 */
    
      /* Check RXNE flag value in SR register */
  if(LL_USART_IsActiveFlag_RXNE(USART1) && LL_USART_IsEnabledIT_RXNE(USART1))
  {
    /* RXNE flag will be cleared by reading of DR register (done in call) */
    /* Call function in charge of handling Character reception */
    USART_CharReception_Callback();
  }
  /* USER CODE END USART1_IRQn 1 */
}

回调只是一个开始的原型

void USART_CharReception_Callback()
{
    Thyone_ans[k] = LL_USART_ReceiveData8(USART1);
    k++;
}

当我调试我的程序时，ISR从不触发，但通过我的逻辑分析仪，我可以在接收线上看到数据。

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我的IRQHandler有什么问题吗？

我发现了问题，它现在可以工作了。我启用了LL_USART_EnableIT_RXNE（USART1）；这就开始了中断。与NVIC_EnableIRQ（USART1_IRQn）有什么区别；？是的，问题是。您为usart启用IRQ，但为哪个usart函数启用IRQ？您必须指定哪个事件。传输结束、接收（您的情况）、奇偶校验错误、cts中断。。。。