外部中断的问题

Honeylulu · 发表于 2018-11-24 15:45:28

我的程序是下面这么写的，PE2,PE3,PE4，PA0连接的按键都是正常工作，但是一复位或者关掉电源重启PA0（wk_up）引脚的按键就不起作用了，这是为什么啊？？

void exti_init(void)
{
key_init();

/*开启AFIO时钟*/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

/*声明EXTI和NVIC结构体*/
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource2); //将GPIOE的Pin2映射到中断线

/*编写中断服务函数*/
EXTI_InitStructure.EXTI_Line = EXTI_Line2;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;

EXTI_Init(&EXTI_InitStructure);

GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource3);

EXTI_InitStructure.EXTI_Line = EXTI_Line3;

EXTI_Init(&EXTI_InitStructure);

GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource4);

EXTI_InitStructure.EXTI_Line = EXTI_Line4;

EXTI_Init(&EXTI_InitStructure);

GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource0);

EXTI_InitStructure.EXTI_Line = EXTI_Line0;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

EXTI_Init(&EXTI_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =0x02;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x03;

NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =0x02;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;

NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;

NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;

NVIC_Init(&NVIC_InitStructure);
}
/*EXTI2中断处理函数*/
void EXTI0_IRQHandler(void)
{
delay_ms(10);
if(key_up==1)
{
BEEP=!BEEP;
}
EXTI_ClearITPendingBit(EXTI_Line0);
}

void EXTI2_IRQHandler(void)
{
delay_ms(10);
//if(EXTI_GetITStatus(EXTI_Line2)!=RESET)
if(key1==0)
{
LED0=!LED0;
}
EXTI_ClearITPendingBit(EXTI_Line2);
}

void EXTI3_IRQHandler(void)
{
delay_ms(10);
if(key2==0)
{
LED1=!LED1;
}
EXTI_ClearITPendingBit(EXTI_Line3);
}

void EXTI4_IRQHandler(void)
{
delay_ms(10);
if(key3==0)
{
LED0=!LED0;
LED1=!LED1;
}
EXTI_ClearITPendingBit(EXTI_Line4); //清除标志位
}