stm32 USART_IT_IDLE中断 一帧数据

//USART_IT_RXNE
USART_ClearITPendingBit(USART1, USART_IT_RXNE);

//USART_IT_IDLE
USART1->SR; //先读SR寄存器
USART1->DR; //再读DR寄存器

u8 count;
u8 flag;

void uart_init(u32 bound)
{
...

USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);

...
}

void USART1_IRQHandler(void)
{
u8 r;

if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
USART_ClearITPendingBit(USART1, USART_IT_RXNE); //只USART_ReceiveData也可以

//r = USART_ReceiveData(USART1);

count++;
}
else if(USART_GetFlagStatus(USART1, USART_FLAG_IDLE) != RESET)
{
USART1->SR;
USART1->DR;

flag = 1;
}
}

int main()
{
while(1)
{
if(flag == 1)
{
printf("count %d\r\n", count);

flag = 0;
count = 0;
}

delay_ms(10);
}
}