[stm32]stm32按键外部中断，如何消抖

讨论一下stm32下按键外部中断如何进行有效的消抖

注:该处理方式仍属于阻塞等待的方式哦，小伙伴们可以把阻塞等待方式改为使用定时器去定时检测的方式

void HAL_GPIO_EXTI_IRQHandler(uint16_t GPIO_Pin)
{
  /* EXTI line interrupt detected */
  if(__HAL_GPIO_EXTI_GET_IT(GPIO_Pin) != RESET)
  {
//    __HAL_GPIO_EXTI_CLEAR_IT(GPIO_Pin);
    HAL_GPIO_EXTI_Callback(GPIO_Pin);
  }
}

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin){
	if(WK_UP_Pin == GPIO_Pin){
        HAL_Delay(10);
        if(1 == HAL_GPIO_ReadPin(WK_UP_GPIO_Port,WK_UP_Pin));
            myprintf(&huart1, "wake up key pressed
");
	}
	else if(KEY0_Pin == GPIO_Pin){
        HAL_Delay(10);
        if(0 == HAL_GPIO_ReadPin(KEY0_GPIO_Port,KEY0_Pin))
            myprintf(&huart1, "key 0 pressed
");
	}
	else if(KEY1_Pin == GPIO_Pin){
        HAL_Delay(10);
        if(0 == HAL_GPIO_ReadPin(KEY1_GPIO_Port,KEY1_Pin))
            myprintf(&huart1, "key 1 pressed
");
	}
	else if(KEY2_Pin == GPIO_Pin){
        HAL_Delay(10);
        if(0 == HAL_GPIO_ReadPin(KEY2_GPIO_Port,KEY2_Pin))
            myprintf(&huart1, "key 2 pressed
");
    }
	HAL_Delay(100);
    __HAL_GPIO_EXTI_CLEAR_IT(GPIO_Pin);
}

如图：消抖成功

下面是之前使用标准库写的，程序采用时间片轮询(周期5ms)的方式进行任务处理，不用外部中断的轮询方式

void Key_Config(void){
	GPIO_InitTypeDef GPIO_InitStructure;
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC,ENABLE);
	// Key1 / Key2 / Key3 -> IPU
	GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU;
	GPIO_InitStructure.GPIO_Pin=GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;	
	GPIO_Init(GPIOC,&GPIO_InitStructure);
	// SW1 -> IPU
	GPIO_InitStructure.GPIO_Mode =GPIO_Mode_IPU;		//SW°´¼üÉÏÀ­ÊäÈë
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
	GPIO_Init(GPIOB,&GPIO_InitStructure);
	// SW2 -> IPU
	GPIO_InitStructure.GPIO_Mode =GPIO_Mode_IPU;		//SW°´¼üÉÏÀ­ÊäÈë
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
	GPIO_Init(GPIOA,&GPIO_InitStructure);
}

u8 Key_Scan(void){
	u8 i,temp;
	for(i=0;i<5;i++)	{		
		temp=KEY_VAL>>i;	
		if(0x1f!=KEY_VAL && 0==(temp & 0x01))
			return i+1;
	}	
	return 0;	
}
u8 Get_Key(void){
	static u8 n,status=0,last_val;
	u8 key_val;
	key_val=Key_Scan();	
	if(0!=key_val && key_val==last_val){
		if(0==status)	status=1;						//°´¼ü°´Ï±êʶ
		else 	n++;
	}
	if(1==status && key_val==0){
		status=0;													//°´¼üÊͷűêʶ
		if(n>2 && n<25){	//40ms ~ 500ms		//¶Ì°´µ¥»÷ʱ¼ä¿ØÖÆ£¬¸ù¾Ý¿ØÖÆÖÜÆÚʱ¼ä¿ØÖÆ´ÎÊý
			n=0;														//Çå³ý¼ÆÊý
			return last_val;								//·µ»Ø¼üÖµ
		}
		else if(n>=25){		//´óÓÚ 500ms			//³¤°´Ê±¼ä¿ØÖÆ
			n=0;														//Çå³ý¼ÆÊý
			return last_val+10;							//³¤°´¼üÖµ = (¶Ì°´¼üÖµ+10)
		}
		else{ 															//°´¼üʱ¼ä¹ý¶Ì±»ÈÏΪÊÇ°´¼ü¶¶¶¯»òÎó°´×´Ì¬
			n=0;														//Çå³ý¼ÆÊý
			return 20;											//·µ»ØÎó°´×´Ì¬
		}
	}
	last_val=key_val;										//±£´æÉÏÒ»´ÎµÄ¼üÖµ
	return 0;
}

void TIM2_Config(void){
	TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
	
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);
	/*	Tout=((arr+1)*(psc+1))/Tclk	*/
	TIM_TimeBaseStructure.TIM_Prescaler=719;         				//Ô¤·ÖƵ£º72 000 000 / (719+1) = 1 000 00 Hz
  TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //¼ÆÊý·½Ê½£ºÏòÉϼÆÊý
  TIM_TimeBaseStructure.TIM_Period= 1999;            				//¼ÆÊýÖÜÆÚ£º1 000 00 / (4999 + 1) = 50 Hz = 0.02 s = 20 ms
  TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;     //ʱÖÓ²»·Ö¸î	
	TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);
	
	NVIC_Config(0,0,TIM2_IRQn,2);	
	TIM_ITConfig(TIM2,TIM_IT_Update , ENABLE);	
	TIM_Cmd(TIM2,ENABLE);	
}

void TIM2_IRQHandler(void){	
	if(TIM_GetFlagStatus(TIM2,TIM_IT_Update)!=RESET)	{
		Key_Val=Get_Key();				//ÔÚÖжϳÌÐòÖлñÈ¡¼üÖµ
		DATA_Task();							//ͨ¹ý°´¼ü»ñȡʹÄÜÄǸöÊý¾Ý´«Ê书ÄÜ£¬Êý¾Ý´«Ê亯ÊýÔÚÖ÷º¯ÊýÖе÷ÓÃ
		TIM_ClearFlag(TIM2,TIM_IT_Update);	
	}
}

小伙伴们有什么更好的方式吗，欢迎下方评论