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STM8S105K6使用串口中断发送,如何清发送完成中断TXE?

avatar gaobingquan 提问时间: 2023-09-22 12:13:14 / 未解决
STM8S105K6使用串口中断发送,如何清发送完成中断TXE?找了一个例程
INTERRUPT_HANDLER(UART2_TX_IRQHandler, 20){        // 写操作自动清中断,因此可以不用显式清中断      
       UART2_ClearITPendingBit(UART2_IT_TXE);                 
       // 从写缓冲中写出1字节        UART2_SendData8(writ_buffer[writ_idx++]);        
     // 全部写完、关写中断、置写完成标志(同步化处理)      
      if( writ_idx == writ_len ) {                UART2_ITConfig(UART2_IT_TXE, DISABLE);                writ_ok = 1;        }
}
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这个例程使用UART2_ClearITPendingBit(UART2_IT_TXE); 来清发送完成中断,会导致进入断言while(1)循环void assert_failed(u8* file, u32 line)
查看UART2_ClearITPendingBit函数说明,发现该函数不能请TXE和TC中断,给出的解决方案是UART2_SendData8() or UART2_SendData9(),写数据的方式。单带来的问题是,实际发送数据时,我的最后一个字节发送完了怎么办,没发清中断标志,又无数可发??
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/**
  * @brief  Clears the UART2 pending flags.
  * @param  UART2_IT specifies the pending bit to clear
  *         This parameter can be one of the following values:
  *         - UART2_IT_LBDF:  LIN Break detection interrupt
  *         - UART2_IT_LHDF:  LIN Header detection interrupt
  *         - UART2_IT_RXNE: Receive Data register not empty interrupt.
  * @note
  *         - PE (Parity error), FE (Framing error), NE (Noise error),
  *           OR (OverRun error) and IDLE (Idle line detected) pending bits are
  *           cleared by software sequence: a read operation to UART2_SR register
  *           (UART2_GetITStatus()) followed by a read operation to UART2_DR register
  *           (UART2_ReceiveData8() or UART2_ReceiveData9()).
  *            
  *         - RXNE pending bit can be also cleared by a read to the UART2_DR
  *           register (UART2_ReceiveData8() or UART2_ReceiveData9()).
  *              
  *         - TC (Transmit complete) pending bit can be cleared by software
  *           sequence: a read operation to UART2_SR register
  *           (UART2_GetITStatus()) followed by a write operation to UART2_DR
  *           register (UART2_SendData8()or UART2_SendData9()).
  *               
  *         - TXE pending bit is cleared only by a write to the UART2_DR register
  *           (UART2_SendData8() or UART2_SendData9()).
  * @retval None
  */
void UART2_ClearITPendingBit(UART2_IT_TypeDef UART2_IT)



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4个回答
  • avatar kate2005_chen
    回答时间: 2023-09-22 12:40:42

    给一段stm32的发送中断程序,供参考: if(USART_GetITStatus(USART1, USART_IT_TXE) != RESET) { /* Write one byte to the transmit data register */ USART_SendData(USART1, usart_user_1.send_buff[TxCounter1++]); if(TxCounter1 == usart_user_1.send_num ) { /* Disable the USART2 Transmit interrupt */ USART_ITConfig(USART1, USART_IT_TXE, DISABLE); TxCounter1 = 0; } }

  • avatar gaobingquan
    回答时间: 2023-09-22 13:10:11

    明白了,谢谢,就是发最后一个数后,关闭发送完成中断,不让它产生TXE。下次发时再打开。

  • avatar gaobingquan
    回答时间: 2023-09-22 13:27:56

    TC中断可以操作寄存器直接清,我使用TC中断发送,不用TXE,效果也很好

  • avatar butterflyspring
    回答时间: 2023-09-22 13:44:58

    TC中断是等上一个数据发送完成后才产生,理论上稍稍慢一点,但是不影响串口发送速度,那么用起来也很顺手的

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