PA11 PA12 用外中断，为什么低电平就一直有中断？

2万 · 2021-11-5 23:54

如下程序：
      // ************************* PA11 PA12 按键中断配置

            RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO,ENABLE);//外部中断，需要使能AFIO时钟
            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_12; // PA11 床1按键 PA12 床2按键
            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;    //; GPIO_Mode_IPU
            GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
            GPIO_Init(GPIOA, &GPIO_InitStructure);

//GPIOA. PA11 PA12       中断线以及中断初始化配置
      GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_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);                //根据EXTI_InitStruct中指定的参数初始化外设EXTI寄存器

            NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;                      //
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;       //抢占优先级
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;                                     //子优先级
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                                                             //
      NVIC_Init(&NVIC_InitStructure);

      GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource12);
      EXTI_InitStructure.EXTI_Line=EXTI_Line12;
      EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
      EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
      EXTI_InitStructure.EXTI_LineCmd = ENABLE;
      EXTI_Init(&EXTI_InitStructure);                //根据EXTI_InitStruct中指定的参数初始化外设EXTI寄存器

            NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;                      //
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;       //抢占优先级
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;                                     //子优先级
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                                                             //
      NVIC_Init(&NVIC_InitStructure);

/****************************************按键中断*************************************/
void EXTI15_10_IRQHandler(void)
{
            if(EXTI_GetITStatus(EXTI_Line11) !=RESET) //PA11 确认有中断
            {
                        Key1_Scan_EN = 1;
                              EXTI_ClearITPendingBit(EXTI_Line11);  //清除LINE11线路挂起位
            }
            if(EXTI_GetITStatus(EXTI_Line12) !=RESET)  //PA12 确认有中断
            {
                              Key2_Scan_EN = 1;
                              EXTI_ClearITPendingBit(EXTI_Line12);  //清除LINE12线路挂起位
            }
}