stm32外部中断实验

//外部中断0服务程序
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(WK_UP==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  
}