stm32f103使用外部中断时无效

hegp

以下为中断的初始化和中断服务函数，中断服务函数的功能代码部分已经测试过没有问题的，但是放在中断服务函数里，无法生效；

void EXTI2_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  EXTI_InitTypeDef EXTI_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  // 使能GPIOE时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE, ENABLE);

  // 配置PE2和PE3为输入模式
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
  GPIO_Init(GPIOE, &GPIO_InitStructure);

  // 配置EXTI线路2和3，选择PE2和PE3作为中断源，并设置下降沿触发
  EXTI_ClearITPendingBit(EXTI_Line2 | EXTI_Line3);
  EXTI_InitStructure.EXTI_Line = EXTI_Line2 | EXTI_Line3;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);

  // 配置中断优先级
  NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

// 中断服务函数，可以在这里编写你的中断处理代码
void EXTI2_IRQHandler(void)
{

    // 处理中断
                LED_On(0);
    EXTI_ClearITPendingBit(EXTI_Line2);

}

void EXTI3_IRQHandler(void)
{
  if (EXTI_GetITStatus(EXTI_Line3) != RESET)
  {
    // 处理中断
                LED_Off(0);
    EXTI_ClearITPendingBit(EXTI_Line3);
  }
}

hegp

中断的分组在主函数设置过了

szczyb1314

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
GPIO_Init(GPIOE, &GPIO_InitStructure);
这里设置内部下拉到GND

EXTI_ClearITPendingBit(EXTI_Line2 | EXTI_Line3);
  EXTI_InitStructure.EXTI_Line = EXTI_Line2 | EXTI_Line3;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);
这里配置的下降沿触发。

你这两个地方有矛盾啊，上面已经配置下拉到GND，应该是只能上升沿触发中断了吧，具体还要看你的电路图哦

hegp

好的，谢谢