## 按键触发外部中断，服务函数被多次调用

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我是靠谱客的博主含蓄母鸡，这篇文章主要介绍## 按键触发外部中断，服务函数被多次调用，现在分享给大家，希望可以做个参考。

一开始多次尝试后，无论是在中断服务函数之前加延时还是之后加延时，都不行。最后开始检查代码，尝试设置引脚初始为高电平，终于成功。

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GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT ;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOE, &GPIO_InitStruct);
GPIO_SetBits(GPIOE,GPIO_Pin_3);//设置默认电平，防止被误触发

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE,GPIO_PinSource3);

EXTI_InitStruct.EXTI_Line = EXTI_Line3 ; 
EXTI_InitStruct.EXTI_Mode= EXTI_Mode_Interrupt ;
EXTI_InitStruct.EXTI_Trigger= EXTI_Trigger_Falling;
EXTI_InitStruct.EXTI_LineCmd= ENABLE;
EXTI_Init(&EXTI_InitStruct);

NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;//外部中断0
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;//抢占优先级0
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;//子优先级2
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能外部中断通道
  NVIC_Init(&NVIC_InitStructure);//配置

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void EXTI3_IRQHandler(void)
{
	int time=0;
	int time_ms,time_us,data;
	time = count;
	
	if(EXTI_GetITStatus(EXTI_Line3) != RESET) 
	{
	printf("UTC Date:%04d/%02d/%02d   ",gpsx.utc.year,gpsx.utc.month,gpsx.utc.date);	//显示UTC日期
			    
	printf("UTC Time:%02d:%02d:%02d s  ",gpsx.utc.hour+8,gpsx.utc.min,gpsx.utc.sec);	//显示UTC时间
 
	time_ms = time/1000;
	time_us = time%1000;
	printf("%d ms %d us  rn",time_ms,time_us);
		
    //清除中断标志位
	}
	delay_ms(10);	
	EXTI_ClearITPendingBit(EXTI_Line3);  
	
}