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车水马龙|

楼主 | 2019-11-24 07:46 | 只看该作者回帖奖励

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外部中断, IO, TI, pi, ni

现在想把PC4设置为下降沿中断，代码如下：NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

  /* 配置中断源 */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);


      /* EXTI line gpio config*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;       // 上拉
  GPIO_Init(GPIOC, &GPIO_InitStructure);

      /* EXTI line mode config */
  GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource4);
  EXTI_InitStructure.EXTI_Line = EXTI_Line4;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //下降沿
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);

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