串口空闲中断不能清理问题-已解决

liu583685

串口空闲中断不能清理问题-已解决 [复制链接]

USART_ClearITPendingBit( UART4, USART_IT_IDLE)；

这个用法是错误的！ 

 

/**
  * [url=home.php?mod=space&uid=159083]@brief[/url] Clears the USARTx's interrupt pending bits.
  * @param  USARTx: Select the USART or the UART peripheral. 
  *   This parameter can be one of the following values:
  *   USART1, USART2, USART3, UART4 or UART5.
  * @param  USART_IT: specifies the interrupt pending bit to clear.
  *   This parameter can be one of the following values:
  *     [url=home.php?mod=space&uid=1238002]@arg[/url] USART_IT_CTS:  CTS change interrupt (not available for UART4 and UART5)
  *     @arg USART_IT_LBD:  LIN Break detection interrupt
  *     @arg USART_IT_TC:   Transmission complete interrupt. 
  *     @arg USART_IT_RXNE: Receive Data register not empty interrupt.
  *   
  * @note
  *   - PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun 
  *     error) and IDLE (Idle line detected) pending bits are cleared by 
  *     software sequence: a read operation to USART_SR register 
  *     (USART_GetITStatus()) followed by a read operation to USART_DR register 
  *     (USART_ReceiveData()).
  *   - RXNE pending bit can be also cleared by a read to the USART_DR register 
  *     (USART_ReceiveData()).
  *   - TC pending bit can be also cleared by software sequence: a read 
  *     operation to USART_SR register (USART_GetITStatus()) followed by a write 
  *     operation to USART_DR register (USART_SendData()).
  *   - TXE pending bit is cleared only by a write to the USART_DR register 
  *     (USART_SendData()).
  * @retval None
  */
void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT)

从一下的库函数注释来开，这个函数可供清除的中断源 只有

 USART_IT_CTS:  CTS change interrupt (not available for UART4 and UART5)
 USART_IT_LBD:  LIN Break detection interrupt
 USART_IT_TC:   Transmission complete interrupt. 
 USART_IT_RXNE: Receive Data register not empty interrupt.

 

而清除PE、FE、NE、ORE、IDLE需要读取 SR 与 DR寄存器

 

以下为正确的串口中断处理

void UART4_IRQHandler(void)
{
	u8 res;
	if(USART_GetITStatus(UART4,USART_IT_RXNE)) 
	{		
		res = USART_ReceiveData(UART4);
		uart4Buff[uart4rs++] = res;
		if(uart4rs >= sizeof(uart4Buff))
			uart4rs = 0;
	}
	else if(USART_GetITStatus(UART4, USART_IT_IDLE))
	{
		res = UART4->SR;
		res = UART4->DR;
	}
}

积累错误...

 

w494143467

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soso

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haitao2018

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