HAL库在初始化uart时，HAL_UART_Receive_IT函数会直接跳到HAL-BUSY

只看该作者 · 2020-4-20 15:40

[C] 纯文本查看复制代码
void HAL_UART_MspInit(UART_HandleTypeDef *huart)
{
//GPIO端口设置
      GPIO_InitTypeDef GPIO_InitStruct;
      if(huart->Instance==USART2)
      {
            USART2_RX_GPIO_CLK_ENABLE();                      //使能GPIOA时钟
            USART2_TX_GPIO_CLK_ENABLE();

            USART2_CLK_ENABLE();                      //使能USART2时钟

            GPIO_InitStruct.Alternate = USART2_TX_AF;
            GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
            GPIO_InitStruct.Pin = USART2_TX_PIN;
            GPIO_InitStruct.Pull = GPIO_PULLUP;
            GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
            HAL_GPIO_Init(USART2_TX_PORT, &GPIO_InitStruct);

            GPIO_InitStruct.Alternate = USART2_RX_AF;
            GPIO_InitStruct.Pin = USART2_RX_PIN;
            HAL_GPIO_Init(USART2_RX_PORT, &GPIO_InitStruct);

            HAL_NVIC_SetPriority(USART2_IRQn,0,0);//第二个数字，对于Core M0无用
            HAL_NVIC_EnableIRQ(USART2_IRQn);

//             __HAL_UART_ENABLE_IT(&UART2_Handler,UART_IT_RXNE);
            HAL_UART_Receive_IT(&UART2_Handler, (uint8_t *)&aRxBuffer, 1);       //每接收到一个字节，就会进入一次回调函数，1为一个字节就进入       ,已经开启RXNE中断

//             aRxBuffer = USART2->ISR;
      }
}

/**
  * @brief Receive an amount of data in interrupt mode.
  * @param huart UART handle.
  * @param pData pointer to data buffer.
  * @param Size amount of data to be received.
  * @note When UART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),
  *       address of user data buffer for storing data to be received, should be aligned on a half word frontier (16 bits)
  *       (as received data will be handled using u16 pointer cast). Depending on compilation chain,
  *       use of specific alignment compilation directives or pragmas might be required to ensure proper alignment for pData.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_UART_Receive_IT(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size)
{
  /* Check that a Rx process is not already ongoing */
  if(huart->RxState == HAL_UART_STATE_READY) //这里不能进入，会直接跳过
  {
if((pData == NULL ) || (Size == 0U))
{
   return HAL_ERROR;
}

/* In case of 9bits/No Parity transfer, pData buffer provided as input paramter
   should be aligned on a u16 frontier, as data to be received from RDR will be
   handled through a u16 cast. */
if ((huart->Init.WordLength == UART_WORDLENGTH_9B) && (huart->Init.Parity == UART_PARITY_NONE))
{
   if((((uint32_t)pData)&1U) != 0U)
   {
      return  HAL_ERROR;
   }
}

/* Process Locked */
__HAL_LOCK(huart);

huart->pRxBuffPtr = pData;
huart->RxXferSize = Size;
huart->RxXferCount = Size;

/* Computation of UART mask to apply to RDR register */
UART_MASK_COMPUTATION(huart);

huart->ErrorCode = HAL_UART_ERROR_NONE;
huart->RxState = HAL_UART_STATE_BUSY_RX;

/* Process Unlocked */
__HAL_UNLOCK(huart);

/* Enable the UART Error Interrupt: (Frame error, noise error, overrun error) */
SET_BIT(huart->Instance->CR3, USART_CR3_EIE);

/* Enable the UART Parity Error and Data Register not empty Interrupts */
SET_BIT(huart->Instance->CR1, USART_CR1_PEIE | USART_CR1_RXNEIE);

return HAL_OK;
  }
  else
  {
return HAL_BUSY;
  }
}

这个问题怎么解决，求助

HAL库在初始化uart时，HAL_UART_Receive_IT函数会直接跳到HAL-BUSY

相关帖子