f4 外部中断的例子同f1略有不同

1.使能SYSSCFG和对应GPIO时钟
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOx, ENABLE);

2.配置对应GPIO为输入模式
        GPIO_InitStructure.GPIO_Mode =GPIO_Mode_IN;
        GPIO_InitStructure.GPIO_PuPd =GPIO_PuPd_NOPULL;
        GPIO_InitStructure.GPIO_Pin =GPIO_Pin_x;
       GPIO_Init(GPIOx,&GPIO_InitStructure);

3.配置对应GPIO为EXIT线

         SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOx,EXTI_PinSourcex);

4.配置EXIT的工作参数
        EXTI_InitStructure.EXTI_Line =EXTI_Linex;
        EXTI_InitStructure.EXTI_Mode =EXTI_Mode_Interrupt;//中断，EXTI_Mode_Event为事件
        EXTI_InitStructure.EXTI_Trigger =EXTI_Trigger_Falling;//下降沿，EXTI_Trigger_Rising为上升沿，EXTI_Trigger_Rising_Falling双跳边沿
        EXTI_InitStructure.EXTI_LineCmd = ENABLE;
        EXTI_Init(&EXTI_InitStructure);

5.配置NVIC中的EXTI中断线
        NVIC_InitStructure.NVIC_IRQChannel =EXTIx_IRQn;
       NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = xx；
       NVIC_InitStructure.NVIC_IRQChannelSubPriority = xx;
        NVIC_InitStructure.NVIC_IRQChannelCmd =ENABLE;
        NVIC_Init(&NVIC_InitStructure);

程序举例：

int main(void)
{
        GPIO_InitTypeDef  GPIO_InitStructure;
        EXTI_InitTypeDef EXTI_InitStructure;
          NVIC_InitTypeDef NVIC_InitStructure;
       RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
       RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
       RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE);
       RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 |GPIO_Pin_8 ;   //led
        GPIO_InitStructure.GPIO_Mode =GPIO_Mode_OUT;
        GPIO_InitStructure.GPIO_OType =GPIO_OType_PP;
        GPIO_InitStructure.GPIO_Speed =GPIO_Speed_100MHz;
        GPIO_InitStructure.GPIO_PuPd =GPIO_PuPd_NOPULL;
        GPIO_Init(GPIOF,&GPIO_InitStructure); 

        GPIO_InitStructure.GPIO_Mode =GPIO_Mode_IN;
        GPIO_InitStructure.GPIO_PuPd =GPIO_PuPd_NOPULL;
        GPIO_InitStructure.GPIO_Pin =GPIO_Pin_0 | GPIO_Pin_5;
       GPIO_Init(GPIOA,&GPIO_InitStructure);
        GPIO_InitStructure.GPIO_Pin =GPIO_Pin_13;
       GPIO_Init(GPIOC,&GPIO_InitStructure);
        GPIO_InitStructure.GPIO_Pin =GPIO_Pin_11;
       GPIO_Init(GPIOF,&GPIO_InitStructure);
       
        SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA,EXTI_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);

        NVIC_InitStructure.NVIC_IRQChannel =EXTI0_IRQn;
       NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;//优先级最低
        NVIC_InitStructure.NVIC_IRQChannelSubPriority= 0x0F;
        NVIC_InitStructure.NVIC_IRQChannelCmd =ENABLE;
        NVIC_Init(&NVIC_InitStructure);

       SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource5);
        EXTI_InitStructure.EXTI_Line =EXTI_Line5;
        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 = 0x0F;//优先级最低
       NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
        NVIC_InitStructure.NVIC_IRQChannelCmd =ENABLE;
        NVIC_Init(&NVIC_InitStructure);

        SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOF,EXTI_PinSource11);
        EXTI_InitStructure.EXTI_Line =EXTI_Line11;
        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 =EXTI15_10_IRQn;
       NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;//优先级最低
       NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
        NVIC_InitStructure.NVIC_IRQChannelCmd =ENABLE;
        NVIC_Init(&NVIC_InitStructure);

       SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOC, EXTI_PinSource13);
        EXTI_InitStructure.EXTI_Line =EXTI_Line13;
        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 =EXTI15_10_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority= 0x0F;//优先级最低
       NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
        NVIC_InitStructure.NVIC_IRQChannelCmd =ENABLE;
        NVIC_Init(&NVIC_InitStructure);

        GPIO_SetBits(GPIOF, GPIO_Pin_7 |GPIO_Pin_9);
        GPIO_SetBits(GPIOF, GPIO_Pin_8 |GPIO_Pin_10);
       
        while (1)
        {
        }
}

voidEXTI0_IRQHandler(void)

{

  if(EXTI_GetITStatus(EXTI_Line0) !=RESET)

  {

    /* Toggle LED1 */

    GPIO_ResetBits(GPIOF, GPIO_Pin_8);

    /* Clear the EXTI line 0 pending bit*/

    EXTI_ClearITPendingBit(EXTI_Line0);

  }

}

void EXTI9_5_IRQHandler(void)

{

  if(EXTI_GetITStatus(EXTI_Line5) !=RESET)

  {

    /* Toggle LED1 */

    GPIO_SetBits(GPIOF, GPIO_Pin_8);

    /* Clear the EXTI line 0 pending bit*/

    EXTI_ClearITPendingBit(EXTI_Line5);

  }

}

void EXTI15_10_IRQHandler(void)

{

  if(EXTI_GetITStatus(EXTI_Line11) !=RESET)

  {

    /* Toggle LED2 */

    GPIO_ResetBits(GPIOF, GPIO_Pin_7);

    /* Clear the EXTI line 0 pending bit*/

    EXTI_ClearITPendingBit(EXTI_Line11);

  }

   if(EXTI_GetITStatus(EXTI_Line13) !=RESET)

  {

    /* Toggle LED2 */

    GPIO_SetBits(GPIOF, GPIO_Pin_7);

    /* Clear the EXTI line 0 pending bit*/

    EXTI_ClearITPendingBit(EXTI_Line13);

  }

}