PA11 PA12 用外中断，为什么低电平就一直有中断？

只看该作者 · 2019-12-4 23:49

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
}
}

不管配置成：EXTI_Trigger_Falling 或EXTI_Trigger_Rising或  EXTI_Trigger_Rising_Falling 只要PA11 或PA12有是低电平，就下直进行中断。
为什么这样的？试无数次了。
为什么啊？

谢谢！谢谢！