Question

我正在通过USART2异步设置通信以接收我的数据。接收数据的配置是9600 / 7bit / 1-bit stop / Parity Even / Mode Rx / Tx。没有实现奇偶校验时，实现工作正常。但规范规定应支持偶校验。

如果添加了奇偶校验，我收到任何值。我不明白问题出在哪里。

我的配置是STMCubeMx用于STM32L031K6核。

    void MX_USART2_UART_Init(void)
    {

      huart2.Instance = USART2;
      huart2.Init.BaudRate = 9600;
      huart2.Init.WordLength = UART_WORDLENGTH_7B;
      huart2.Init.StopBits = UART_STOPBITS_1;
      huart2.Init.Parity = UART_PARITY_NONE;
      huart2.Init.Mode = UART_MODE_RX;
      huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
      huart2.Init.OverSampling = UART_OVERSAMPLING_16;
      huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
      huart2.AdvancedInit.AdvFeatureInit =    UART_ADVFEATURE_RXOVERRUNDISABLE_INIT|UART_ADVFEATURE_DMADISABLEONERROR_INIT;
      huart2.AdvancedInit.OverrunDisable = UART_ADVFEATURE_OVERRUN_DISABLE;
      huart2.AdvancedInit.DMADisableonRxError = UART_ADVFEATURE_DMA_DISABLEONRXERROR;
      if (HAL_UART_Init(&huart2) != HAL_OK)
      {
        Error_Handler();
      }

    }

    void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)
    {

      GPIO_InitTypeDef GPIO_InitStruct;
      if(uartHandle->Instance==USART2)
      {
        /* Peripheral clock enable */
        __HAL_RCC_USART2_CLK_ENABLE();

        /**USART2 GPIO Configuration    
        PA9     ------> USART2_TX
        PA10     ------> USART2_RX 
        */
        GPIO_InitStruct.Pin = GPIO_PIN_9|GPIO_PIN_10;
        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
        GPIO_InitStruct.Pull = GPIO_PULLUP;
        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
        GPIO_InitStruct.Alternate = GPIO_AF4_USART2;
        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

        /* Peripheral interrupt init */
        HAL_NVIC_SetPriority(USART2_IRQn, 0, 0);
        HAL_NVIC_EnableIRQ(USART2_IRQn);
      }
    }

    void HAL_UART_MspDeInit(UART_HandleTypeDef* uartHandle)
    {

      if(uartHandle->Instance==USART2)
      {
        /* Peripheral clock disable */
        __HAL_RCC_USART2_CLK_DISABLE();

        /**USART2 GPIO Configuration    
        PA9     ------> USART2_TX
        PA10     ------> USART2_RX 
        */
        HAL_GPIO_DeInit(GPIOA, GPIO_PIN_9|GPIO_PIN_10);

        /* Peripheral interrupt Deinit*/
        HAL_NVIC_DisableIRQ(USART2_IRQn);

      }
    } 

void MX_GPIO_Init(void)
{

  GPIO_InitTypeDef GPIO_InitStruct;

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_3, GPIO_PIN_RESET);

  /*Configure GPIO pin : PB3 */
  GPIO_InitStruct.Pin = GPIO_PIN_3;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

}
/*********************** interruption **********************/ 

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
    if (huart->Instance == USART2)  //current UART
        {   
            Receive();
            HAL_UART_Receive_IT(&huart2, Rx_data, 1);   
        }
}

/******************** Main ******************************/
int main(void)
{
  HW_Init();
  HAL_UART_Receive_IT(&huart2, Rx_data, 1); 
  while (1)
  {
  }
}

Answer 1

在STM32系列上使用奇偶校验时，需要将UART_WORDLENGTH_7B增加到UART_WORDLENGTH_8B（如果有8位数据，则需要增加UART_WORDLENGTH_9B）。

我最近才遇到同样的问题。此时HAL API应该更好......

UART STM32L0，奇偶校验位实现

1 个答案: