stm32 UART串口

void USART1_IRQHandler(void)                    //´®¿Ú1ÖжϷþÎñ³ÌÐò
    {
    u8 Res;
#ifdef OS_TICKS_PER_SEC         //Èç¹ûʱÖÓ½ÚÅÄÊý¶¨ÒåÁË,˵Ã÷ҪʹÓÃucosIIÁË.
    OSIntEnter();
#endif
    if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  //½ÓÊÕÖжÏ(½ÓÊÕµ½µÄÊý¾Ý±ØÐëÊÇ0x0d 0x0a½áβ)
        {

        Res =USART_ReceiveData(USART1);//(USART1->DR);    //¶ÁÈ¡½ÓÊÕµ½µÄÊý¾Ý

            if(Res==0x31)
            {
            //LED0ÉÁÒ»´Î
            LED0 = ;
          delay_ms();
            LED0 = ;
          delay_ms();
            LED0 = ;
            delay_ms();
            LED0 = ;
            }
        //LED1 ÁÁ
            if(Res==0x32)
            {

                LED1 = ;

            }

        )//½ÓÊÕδÍê³É
            {
            if(USART_RX_STA&0x4000)  //½ÓÊÕµ½ÁË0x0d
                {
                ;//½ÓÊÕ´íÎó,ÖØпªÊ¼
                else USART_RX_STA|=0x8000;    //½ÓÊÕÍê³ÉÁË
                }
            else //»¹Ã»ÊÕµ½0X0D
                {
                if(Res==0x0d)USART_RX_STA|=0x4000;
                else
                    {
                    USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
                    USART_RX_STA++;
                    ))USART_RX_STA=;//½ÓÊÕÊý¾Ý´íÎó,ÖØпªÊ¼½ÓÊÕ
                    }
                }
            }
     } 

)
    {
        if(USART_RX_STA&0x8000)
        {
            len=USART_RX_STA&0x3fff;//µÃµ½´Ë´Î½ÓÊÕµ½µÄÊý¾Ý³¤¶È
            printf("\r\nÄú·¢Ë͵ÄÏûϢΪ:\r\n\r\n");
            ;t<len;t++)
            {
                USART_SendData(USART1, USART_RX_BUF[t]);//Ïò´®¿Ú1·¢ËÍÊý¾Ý
                while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);//µÈ´ý·¢ËͽáÊø
            }
            printf("\r\n\r\n");//²åÈë»»ÐÐ
            USART_RX_STA=;
        }
         else

        {
            times++;
         ==)printf("\r\nѧºÅ:14160310317ÐÕÃû:ÕÔ´æµµ µÈ´ýKEY0 KEY1 ±»°´ÏÂ\r\n");
     delay_ms();
         t=KEY_Scan();
        if(t)
        {
            switch(t)
            {
                case KEY_UP:
              printf("\r\nKEY0±»°´ÏÂ\r\n\r\n");
              break;
                case KEY_LEFT:
                    BEEP=;
                  delay_ms();
                  BEEP=;
                break;
            }
        }
    }
 }