STM32F407中断初始化代码

void Interrupt_Init(void)

{

GPIO_InitTypeDef  GPIO_InitStructure;

NVIC_InitTypeDef   NVIC_InitStructure;

EXTI_InitTypeDef   EXTI_InitStructure;

//1.IO初始化

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE); 

GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5;  

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; //普通输入模式

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //100M

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉

GPIO_Init(GPIOF, &GPIO_InitStructure);    //初始化GPIOF2,3,4

//2.开启SYSCFG

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);      //使能 SYSCFG 时钟

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOF, EXTI_PinSource2);

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOF, EXTI_PinSource3);

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOF, EXTI_PinSource4);

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOF, EXTI_PinSource5);

//3.初始化线上中断，设置触发方式 

EXTI_InitStructure.EXTI_Line = EXTI_Line2; 

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; 

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;  

EXTI_InitStructure.EXTI_LineCmd = ENABLE; 

EXTI_Init(&EXTI_InitStructure); 

EXTI_InitStructure.EXTI_Line = EXTI_Line3; 

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; 

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;  

EXTI_InitStructure.EXTI_LineCmd = ENABLE; 

EXTI_Init(&EXTI_InitStructure); 

EXTI_InitStructure.EXTI_Line = EXTI_Line4; 

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; 

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; 

EXTI_InitStructure.EXTI_LineCmd = ENABLE; 

EXTI_Init(&EXTI_InitStructure); 

EXTI_InitStructure.EXTI_Line = EXTI_Line5; 

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; 

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; 

EXTI_InitStructure.EXTI_LineCmd = ENABLE; 

EXTI_Init(&EXTI_InitStructure); 

//4.配置中断分组

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);

NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn;          

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

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02; //响应优先级 2 

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

NVIC_Init(&NVIC_InitStructure);      

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);

NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;          

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

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x03; //响应优先级 3 

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

NVIC_Init(&NVIC_InitStructure);      

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);

NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn;          

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

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x04; //响应优先级 4 

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

NVIC_Init(&NVIC_InitStructure);      

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);

NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;          

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

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x05; //响应优先级 5 

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

NVIC_Init(&NVIC_InitStructure);      

}

void EXTI2_IRQHandler(void)

{

if (EXTI_GetITStatus(EXTI_Line2) != RESET)

{

EXTI_ClearITPendingBit(EXTI_Line2);

//TODO:

EXTI_ClearITPendingBit(EXTI_Line2);

}   

}

void EXTI3_IRQHandler(void)

{

if (EXTI_GetITStatus(EXTI_Line3) != RESET)

{

EXTI_ClearITPendingBit(EXTI_Line3);

//TODO:

EXTI_ClearITPendingBit(EXTI_Line3);

}   

}

void EXTI4_IRQHandler(void)

{

if (EXTI_GetITStatus(EXTI_Line4) != RESET)

{

EXTI_ClearITPendingBit(EXTI_Line4);

//TODO:

EXTI_ClearITPendingBit(EXTI_Line4);

}   

}

void EXTI9_5_IRQHandler(void)

{

if (EXTI_GetITStatus(EXTI_Line5) != RESET)

{

EXTI_ClearITPendingBit(EXTI_Line5);

//TODO:

EXTI_ClearITPendingBit(EXTI_Line5);

}   

}