今天遇到一问题，在USART中使用库提供的flag清除函数，是清除不了的，搞得中断老跳不出，弄了好久．如下：
void USART1_IRQHandler(void)
{
if(USART_GetITStatus(USART1, USART_IT_IDLE)!=RESET)
{
//USART_ClearFlag(USART1, USART_FLAG_IDLE); 清除不了USART_FLAG_IDL
Rxtmp=USART1->SR; ／／先读SR，然后读DR才能清除
Rxtmp=USART1->DR;
USART_ClearITPendingBit(USART1, USART_IT_IDLE);
．．．
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＂This bit is set by hardware when an Idle Line is detected. An interrupt is generated if the IDLEIE=1
in the USART_CR1 register. It is cleared by a software sequence (an read to the USART_SR register followed by a read to the USART_DR register).
0: No Idle Line is detected
1: Idle Line is detected＂
在USART中有关的flag几乎都是这样的，USART_GetITStatus（）函数毫无用处，反而产生误导． |
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