串口中断问题求助

payun

串口接收中断程序，实验现象是每次发送任意字符串，都会收到两次返回信息：
MESSAGE INCOMMING!
PRESS KEY0 TO READ,PRESS KEY1 TO IGNORE,PRESS WU_UP TO DELATE
MESSAGE INCOMMING!
PRESS KEY0 TO READ,PRESS KEY1 TO IGNORE,PRESS WU_UP TO DELATE

为何会两次进入串口中断？请教各位给挑挑错。

代码如下：
void USART1_IRQHandler()
{
    u8 n;

    char Dev[85]="MESSAGE INCOMMING!\r\nPRESS KEY0 TO READ,PRESS KEY1 TO IGNORE,PRESS WU_UP TO DELATE\r\n";

    if(USART_GetITStatus(USART1,USART_IT_RXNE)!=RESET)
    {
        u8 data;
        data=USART_ReceiveData(USART1);

        for(n=0;n<=85;n++)
        {
            USART_SendData(USART1,Dev[n]);
            while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);
        }
        flag_LEDred=0;flag_LEDgreen=0;
        LEDgreen=0;LEDred=0;
    }
}

payun

回复【2楼】yklstudent:
---------------------------------
data=USART_ReceiveData(USART1);
读DR应该就会清零RXNE，再加一句没有必要啊

还有cCOM2是什么鬼？

payun

void USART1_IRQHandler()
{
    u8 n; 

    char Dev[85]="MESSAGE INCOMMING!\r\nPRESS KEY0 TO READ,PRESS KEY1 TO IGNORE,PRESS WU_UP TO DELATE\r\n";

    if(USART_GetITStatus(USART1,USART_IT_RXNE)!=RESET)
    {
        u8 data; 
        data=USART_ReceiveData(USART1); 

        for(n=0;n<=85;n++)
        {
            USART_SendData(USART1,Dev[n]);
            while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);
        }
        flag_LEDred=0;flag_LEDgreen=0;
        LEDgreen=0;LEDred=0;
     }
     USART_ClearITPendingBit(USART1, USART_IT_RXNE); 
}

中断中使用指令再次清除RXNE标志位，可以只收到一条回复，新的问题是：只能进入一次中断，后续串口再发送任何信息都无效，中断无法再次触发了