The USART_IT_IDLE interrupt is an interrupt that occurs after the serial port receives a frame of data. It can also be called a packet of data.
Difference between USART_IT_IDLE and USART_IT_RXNE
When 1 byte is received, a USART_IT_RXNE interrupt will be generated
When a frame of data is received, a USART_IT_IDLE interrupt is generated.
Clear interrupt method
//USART_IT_RXNE
USART_ClearITPendingBit(USART1, USART_IT_RXNE);
//USART_IT_IDLE
USART1->SR; //Read SR register first
USART1->DR; //Read DR register again
Usage Examples
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); //Only USART_ReceiveData can also be used
//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);
}
}
Experimental phenomena
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