外部中断问题

361901725@qq.co · 发表于 2016-2-17 09:21:12

RT 此处要利用PD7做为外部中断入口，判断其电平。但是运行时发现PD15（配置为I/O开关输出）也可以进入EXIT9_5中断，P并且D15和PD7互不影响对方电平。不知该如何解决。
void EXTIX_Init(void)
{

EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); //使能复用功能时钟

//GPIOD.7 中断线以及中断初始化配置下降沿触发
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOD,GPIO_PinSource7);

    EXTI_InitStructure.EXTI_Line=EXTI_Line7; //PD7
    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 = EXTI9_5_IRQn; //中断线5-9，共用中断函数
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级2，
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //子优先级1
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能外部中断通道
    NVIC_Init(&NVIC_InitStructure);       //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器

}
void EXTI9_5_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line7)!=RESET)
{
EXTI_InitTypeDef EXTI_InitStructure;
delay_ms(10);//消抖
open_close++;
if(open_close==1)
{
USART1_Write_ButtonStatus(203,0xFF,0x00);delay_ms(5);
printf("开门\r\n");
EXTI_InitStructure.EXTI_Line=EXTI_Line7; //PD7
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
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
}
if(open_close==2)
{
USART1_Write_ButtonStatus(204,0xFF,0x00);delay_ms(5);
printf("关门\r\n");
EXTI_InitStructure.EXTI_Line=EXTI_Line7; //PD7
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
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
open_close=0;
}
EXTI_ClearITPendingBit(EXTI_Line7); //清除LINE0上的中断标志位
  }
}