STM32F0 外部中斷程序

1. 配置PA4，PA5爲外部中斷

void EXTI_Config(void)
{
  EXTI_InitTypeDef   EXTI_InitStructure;
  GPIO_InitTypeDef   GPIO_InitStructure;
  NVIC_InitTypeDef   NVIC_InitStructure;
  
  /* Enable GPIOA clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA|RCC_AHBPeriph_GPIOF, ENABLE);

  /* Configure PA4&PA5 pin as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_5;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Enable SYSCFG clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
  
  /* Connect EXTI4 Line to PA4 pin */
  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource4|EXTI_PinSource5);

  /* Configure EXTI4&EXTI5 line */
  EXTI_InitStructure.EXTI_Line = EXTI_Line4|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);

  /* Enable and set EXTI4&EXTI5 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI4_15_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}
2， 外部觸發中斷函數

void EXTI4_15_IRQHandler(void)
{
  if(EXTI_GetITStatus(EXTI_Line4) != RESET)
  {
    /* Clear the EXTI line 0 pending bit */
    EXTI_ClearITPendingBit(EXTI_Line4);
        if(PauseFlag == 0)
        {
            ExtiCnt++;
            
        }
  }
  if(EXTI_GetITStatus(EXTI_Line5) != RESET)
  {
    /* Clear the EXTI line 0 pending bit */
    EXTI_ClearITPendingBit(EXTI_Line5);
        if(PauseFlag == 0)
        {
            ExtiCnt++;
            
        }
  }
}