用探索板做的

代码如下：


[mw_shl_code=applescript,true]void EXTI_PA7_Config(void)
{
        GPIO_InitTypeDef GPIO_InitStructure;
        EXTI_InitTypeDef EXTI_InitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;

        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
        SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource7);

        NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
        NVIC_Init(&NVIC_InitStructure);
       
        GPIO_StructInit(&GPIO_InitStructure);
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;      
        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
        GPIO_Init(GPIOA, &GPIO_InitStructure);

        EXTI_InitStructure.EXTI_Line = EXTI_Line7;
        EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
        EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
        EXTI_InitStructure.EXTI_LineCmd = ENABLE;
        EXTI_Init(&EXTI_InitStructure);
}


void EXTI9_5_IRQHandler()
{
        if(EXTI_GetITStatus(EXTI_Line7)!=RESET)
        {
                TIM_SetCounter(TIM4, 0);
                EXTI_ClearITPendingBit(EXTI_Line7);
        }
}[/mw_shl_code]

输入信号的波形如图

仿真的时候无法进入中断