void EXTIX_Init(void)
{

        GPIO_InitTypeDef  GPIO_InitStructure;
        NVIC_InitTypeDef   NVIC_InitStructure;
        EXTI_InitTypeDef   EXTI_InitStructure;
       
        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100M
        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
        GPIO_Init(GPIOD, &GPIO_InitStructure);
       
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
       
        SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOD, EXTI_PinSource8);

    EXTI_InitStructure.EXTI_Line = EXTI_Line8;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);
       
        NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
        NVIC_Init(&NVIC_InitStructure);
                          
}
void EXTI9_5_IRQHandler(void)
{
       
        EN_ADM3=0;
        SD_ADM3=1;
EXTI_ClearITPendingBit(EXTI_Line8);
}

问题出在哪呢