UART1中断服务函数

UART1中断

extern SemaphoreHandle_t BinarySemaphore; //二值信号量句柄
void USART1_IRQHandler(void)              //串口 1 中断服务程序
{
    u8 Res;
    BaseType_t xHigherPriorityTaskWoken;
    if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
    {
        Res = USART_ReceiveData(USART1);  //(USART1->DR); //读取接收到的数据
        if ((USART_RX_STA & 0x8000) == 0) //接收未完成
        {
            if (USART_RX_STA & 0x4000) //接收到了 0x0d
            {
                if (Res != 0x0a)
                    USART_RX_STA = 0; //接收错误,重新开始
                else
                    USART_RX_STA |= 0x8000; //接收完成了
            }
            else //还没收到 0X0D
            {
                if (Res == 0x0d)
                    USART_RX_STA |= 0x4000;
                else
                {
                    USART_RX_BUF[USART_RX_STA & 0X3FFF] = Res;
                    USART_RX_STA++;
                    if (USART_RX_STA > (USART_REC_LEN - 1))
                        USART_RX_STA = 0;
                }
            }
        }
    }
    //释放二值信号量
    if ((USART_RX_STA & 0x8000) && (BinarySemaphore != NULL))
    {
        //释放二值信号量
        xSemaphoreGiveFromISR(BinarySemaphore, &xHigherPriorityTaskWoken);
        (1)
            portYIELD_FROM_ISR(xHigherPriorityTaskWoken); //如果需要的话进行一次任务切换
    }
}