stm32串口中断输出void USARTx_IRQHANDLER(void)
{vu16 RS485_RX_BUF[64];
vu8 *a;
  if(USART_GetITStatus(Open_USART, USART_IT_RXNE) != RESET)
  { vu16  Res;vu16 RS485_RX_CNT=0;
   
  USART_ClearITPendingBit(USART1,USART_IT_RXNE);
       Res =USART_ReceiveData(USART1);
       if(RS485_RX_CNT<64)
  {
   RS485_RX_BUF[RS485_RX_CNT]=Res; 
           
         //记录接收到的值
   RS485_RX_CNT++;      //接收数据增加1
  }
    
      
  }
 
 
  if(RS485_RX_BUF[0]&&RS485_RX_BUF[1]==0)
    {a="printf the ad value="; 
  VIEWTECH_54(0x000a,0x000a,a,21);
  }
 
 
}
为什么会输出两次呀连续