UART1中断服务函数

UART1中断
 1 extern SemaphoreHandle_t BinarySemaphore; //二值信号量句柄
 2 void USART1_IRQHandler(void)              //串口 1 中断服务程序
 3 {
 4     u8 Res;
 5     BaseType_t xHigherPriorityTaskWoken;
 6     if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
 7     {
 8         Res = USART_ReceiveData(USART1);  //(USART1->DR); //读取接收到的数据
 9         if ((USART_RX_STA & 0x8000) == 0) //接收未完成
10         {
11             if (USART_RX_STA & 0x4000) //接收到了 0x0d
12             {
13                 if (Res != 0x0a)
14                     USART_RX_STA = 0; //接收错误,重新开始
15                 else
16                     USART_RX_STA |= 0x8000; //接收完成了
17             }
18             else //还没收到 0X0D
19             {
20                 if (Res == 0x0d)
21                     USART_RX_STA |= 0x4000;
22                 else
23                 {
24                     USART_RX_BUF[USART_RX_STA & 0X3FFF] = Res;
25                     USART_RX_STA++;
26                     if (USART_RX_STA > (USART_REC_LEN - 1))
27                         USART_RX_STA = 0;
28                 }
29             }
30         }
31     }
32     //释放二值信号量
33     if ((USART_RX_STA & 0x8000) && (BinarySemaphore != NULL))
34     {
35         //释放二值信号量
36         xSemaphoreGiveFromISR(BinarySemaphore, &xHigherPriorityTaskWoken);
37         (1)
38             portYIELD_FROM_ISR(xHigherPriorityTaskWoken); //如果需要的话进行一次任务切换
39     }
40 }