STM32外部中断线编程

#include "ExtiConfig.h"

unsigned char key1Down = 0;
unsigned char key2Down = 0;

/**************************************************************
**
**
***************************************************************/
void EXTI_Config(void)
{
	EXTI_InitTypeDef extiStruct;
	NVIC_InitTypeDef nvicStruct;
    GPIO_InitTypeDef GPIOInit;

//	NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x00);
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//先4 从4
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD | RCC_APB2Periph_AFIO, ENABLE);

//GPIOA 配置
	GPIOInit.GPIO_Mode = GPIO_Mode_IPU;	//PA0 上拉输入
	GPIOInit.GPIO_Pin = GPIO_Pin_3;		//LF
	GPIOInit.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOD, &GPIOInit);

	GPIOInit.GPIO_Mode = GPIO_Mode_IPU;	//PB5 上拉输入
	GPIOInit.GPIO_Pin = GPIO_Pin_13;
	GPIOInit.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOC, &GPIOInit);

	GPIO_EXTILineConfig(GPIO_PortSourceGPIOD, GPIO_PinSource3);
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource13);

	extiStruct.EXTI_Line = EXTI_Line3 | EXTI_Line13;
	extiStruct.EXTI_Mode = EXTI_Mode_Interrupt;
	extiStruct.EXTI_Trigger = EXTI_Trigger_Falling;
	extiStruct.EXTI_LineCmd = ENABLE;
	EXTI_Init(&extiStruct);
	EXTI_ClearITPendingBit(EXTI_Line3);
	EXTI_ClearITPendingBit(EXTI_Line13);	

    	//外部中断线0,中断复用PA0
	nvicStruct.NVIC_IRQChannel = EXTI3_IRQn;
	nvicStruct.NVIC_IRQChannelPreemptionPriority = 1;
	nvicStruct.NVIC_IRQChannelSubPriority = 1;
	nvicStruct.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&nvicStruct); 	

	nvicStruct.NVIC_IRQChannel = EXTI15_10_IRQn;
	nvicStruct.NVIC_IRQChannelPreemptionPriority = 1;
	nvicStruct.NVIC_IRQChannelSubPriority = 0;
	nvicStruct.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&nvicStruct);
}

/**************************************************************
**  外部中断函数,中断线为13
**
***************************************************************/
void EXTI_Line13IRQ(void)
{
    if(EXTI_GetITStatus(EXTI_Line13)!=RESET)
    {
        if(key1Down==0)
        {
            key1Down = 1;
        }
        EXTI_ClearITPendingBit(EXTI_Line13); //清除 LINE 上的中断标志位
    }
}

/**************************************************************
**  外部中断函数,中断线为13
**
***************************************************************/
void EXTI_Line3IRQ(void)
{
    if(EXTI_GetITStatus(EXTI_Line3)!=RESET)
    {
        if(key2Down==0)
        {
            key2Down = 1;
        }
        EXTI_ClearITPendingBit(EXTI_Line3); //清除 LINE 上的中断标志位
    }
}

一些全局的中断标志key1Down和key2Down是为了给工程的其他部分的程序提供一些逻辑。