外部中断进不去，求教！

泪空heart

一直进不去PE0外部中断==求教！
void NVIC_Configuration(void)
{   
#ifdef  VECT_TAB_RAM  
  /* Set the Vector Table base location at 0x20000000 */ 
  NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); 
#else  /* VECT_TAB_FLASH  */
  /* Set the Vector Table base location at 0x08000000 */ 
  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);   
#endif
   NVIC_InitTypeDef  NVIC_InitStructure;
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
    NVIC_InitStructure.NVIC_IRQChannel=EXTI0_IRQChannel;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;
    NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

void Exti_Configuration(void)
{ 
    EXTI_InitTypeDef  EXTI_InitStructure;
   GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource0);
   EXTI_InitStructure.EXTI_Line=EXTI_Line0;
   EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
   EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;
   EXTI_InitStructure.EXTI_LineCmd=ENABLE;
  EXTI_Init(&EXTI_InitStructure);  
}

void EXTI0_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line0)!=RESET) //判断某个线上的中断是否发生
    GPIO_SetBits(GPIOE,GPIO_Pin_5);
EXTI_ClearITPendingBit(EXTI_Line0);      //清除LINE  线上的中断标志位
}

void gpio_init(void)
{
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE,ENABLE);
   GPIO_InitStructure.GPIO_Pin=GPIO_Pin_5;
   GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
   GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
   GPIO_ResetBits(GPIOE,GPIO_Pin_5);
   GPIO_Init(GPIOE,&GPIO_InitStructure);
}

小曾

PE0要设置成输入