void EXTIX_Init(void)  

{  

    EXTI_InitTypeDef EXTI_InitStructure;  

    NVIC_InitTypeDef NVIC_InitStructure;  

    KEY_Init();  // 按键端口初始化  

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); //使能复用功能时钟  

  //GPIOE.2 中断线以及中断初始化配置   下降沿触发  

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource2);  

    EXTI_InitStructure.EXTI_Line=EXTI_Line2;    //KEY2  

    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;   

    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;  

    EXTI_InitStructure.EXTI_LineCmd = ENABLE;  

    EXTI_Init(&EXTI_InitStructure);     //根据EXTI_InitStruct中指定的参数初始化外设EXTI寄存器  

 //GPIOE.3    中断线以及中断初始化配置 下降沿触发 //KEY1  

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource3);  

    EXTI_InitStructure.EXTI_Line=EXTI_Line3;  

    EXTI_Init(&EXTI_InitStructure);     //根据EXTI_InitStruct中指定的参数初始化外设EXTI寄存器  

 //GPIOE.4    中断线以及中断初始化配置  下降沿触发   //KEY0  

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource4);  

    EXTI_InitStructure.EXTI_Line=EXTI_Line4;  

    EXTI_Init(&EXTI_InitStructure);     //根据EXTI_InitStruct中指定的参数初始化外设EXTI寄存器  

  //GPIOA.0   中断线以及中断初始化配置 上升沿触发 PA0  WK_UP  

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource0);   

    EXTI_InitStructure.EXTI_Line=EXTI_Line0;  

    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;  

    EXTI_Init(&EXTI_InitStructure);     //根据EXTI_InitStruct中指定的参数初始化外设EXTI寄存器  

    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;            //使能按键WK_UP所在的外部中断通道  

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;    //抢占优先级2，   

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x03;                   //子优先级3  

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                             //使能外部中断通道  

    NVIC_Init(&NVIC_InitStructure);   

    NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn;            //使能按键KEY2所在的外部中断通道  

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;    //抢占优先级2，   

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;                   //子优先级2  

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                             //使能外部中断通道  

    NVIC_Init(&NVIC_InitStructure);  

    NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;            //使能按键KEY1所在的外部中断通道  

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;    //抢占优先级2   

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;                   //子优先级1   

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                             //使能外部中断通道  

    NVIC_Init(&NVIC_InitStructure);       //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器  

    NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn;            //使能按键KEY0所在的外部中断通道  

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;    //抢占优先级2   

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;                   //子优先级0   

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                             //使能外部中断通道  

    NVIC_Init(&NVIC_InitStructure);       //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器  

}  

//外部中断0服务程序   

void EXTI0_IRQHandler(void)  

{  

    delay_ms(10);//消抖  

    if(KEY3==1)      //WK_UP按键  

    {                  

        BEEP=!BEEP;   

    }  

    EXTI_ClearITPendingBit(EXTI_Line0); //清除LINE0上的中断标志位    

}  

//外部中断2服务程序  

void EXTI2_IRQHandler(void)  

{  

    delay_ms(10);//消抖  

    if(KEY2==0)   //按键KEY2  

    {  

        LED0=!LED0;  

    }          

    EXTI_ClearITPendingBit(EXTI_Line2);  //清除LINE2上的中断标志位    

}  

//外部中断3服务程序  

void EXTI3_IRQHandler(void)  

{  

    delay_ms(10);//消抖  

    if(KEY1==0)  //按键KEY1  

    {                  

        LED1=!LED1;  

    }          

    EXTI_ClearITPendingBit(EXTI_Line3);  //清除LINE3上的中断标志位    

}  

void EXTI4_IRQHandler(void)  

{  

    delay_ms(10);//消抖  

    if(KEY0==0)  //按键KEY0  

    {  

        LED0=!LED0;  

        LED1=!LED1;   

    }          

    EXTI_ClearITPendingBit(EXTI_Line4);  //清除LINE4上的中断标志位    

}