外部中断配置如下，配置完成中断函数无法进去
/*-----------------------------------------------------------
Function:
Input:
Output:
Description:外部中断配置
-------------------------------------------------------------*/
void Exit_Config(void)
{
  
  NVIC_InitTypeDef NVIC_InitStructure;
  EXTI_InitTypeDef   EXTI_InitStructure;
  GPIO_InitTypeDef   GPIO_InitStructure;
  
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);//使能SYSCFG时钟
  
   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
  
   /* Configure PC3 pin as input floating */
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
  
  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOC, EXTI_PinSource3);
  
  EXTI_InitStructure.EXTI_Line = EXTI_Line3;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_LineCmd = EXTI_Trigger_Falling;
  EXTI_InitStructure.EXTI_Trigger = ENABLE;
  EXTI_Init(&EXTI_InitStructure);     //初始化外设EXTI寄存器
  
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
  NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
  
  EN_CCWAKE_INT;
  EXTI->IMR |= (EXTI_Line3 );
  EXTI_ClearITPendingBit(EXTI_Line3);
//  EXTI_GenerateSWInterrupt(EXTI_Line3);
}

参阅ST官方代码，貌似少了一句：
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Example.rar (15.06 KB, 下载次数: 1)

2018-7-17 14:57 上传

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如楼上说的，楼主把触发方式和开启写反了。
  EXTI_InitStructure.EXTI_Line = EXTI_Line8;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;