STM8S105K6使用串口中断发送，如何清发送完成中断TXE？
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);
// 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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/**
* @briefClears the UART2 pending flags.
* @paramUART2_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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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);
if(TxCounter1 == usart_user_1.send_num )
{
/* Disable the USART2 Transmit interrupt */
USART_ITConfig(USART1, USART_IT_TXE, DISABLE);
TxCounter1 = 0;
}
} 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。 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 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:lol
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