配置一个I/O为EXTI中断的步骤：

GPIO_InitTypeDefGPIO_InitStructure;

EXTI_InitTypeDefEXTI_InitStructure;

NVIC_InitTypeDefNVIC_InitStructure;

//1.使能EXTIx线的时钟和第二功能AFIO时钟

RCC_APB2PeriphClockCmd（RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOA，ENABLE）;

//NVIC_CONFIG（）;

//2.配置EXTIx线的中断优先级

NVIC_PriorityGroupConfig（NVIC_PriorityGroup_1）;

NVIC_InitStructure.NVIC_IRQChannel=EXTI3_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;

NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;

NVIC_Init（&NVIC_InitStructure）;

//3.配置EXTIx中断线的I/O口

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_3;

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPD;

GPIO_Init（GPIOA，&GPIO_InitStructure）;

GPIO_EXTILineConfig（GPIO_PortSourceGPIOA，GPIO_PinSource3）;//4.选定要配置为EXTI的I/O口线

//5.EXTIx中断线的工作模式的配置

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）;

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