基于状态机思想的按键扫描程序支持单按，连续按，长按模式。

最新推荐文章于 2024-08-19 19:17:55 发布

sun shang chao

最新推荐文章于 2024-08-19 19:17:55 发布

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CC 4.0 BY-SA版权

分类专栏： c/c++

本文链接：https://blog.youkuaiyun.com/Sun19910114/article/details/53607329

typedef enum {
	ButtonsStateUp           = 0,
	ButtonsStateDownJitter      ,
	ButtonsStateDown            ,
	ButtonsStateUpJitter
} EnumButtonsState;

typedef unsigned char uint8;
typedef unsigned long uint32;

#define BUTTONS_UP    0
#defien BUTTONS_DOWN  1

#define BUTTONS_EVENT_NONE           0x00
#define BUTTONS_EVENT_SINGLE_DOWN    0x01
#define BUTTONS_EVENT_SERIES_DOWN    0x02
#define BUTTONS_EVENT_CONTINUE_DOWN  0x03
#define BUTTONS_EVENT_UP             0x04

EnumButtonsState ButtonsState;

void ButtonsScanSM(uint8 *event_type)
{
	uint8 buttons_status;
	
	static uint32 time_point        = 0;
	static uint8  series_down_flg   = 0;
	
	buttons_status = GetButtonsStatus();
	
	switch(ButtonsState)
	{
		case ButtonsStateUp:
		{		
			if(GetSysTicks() - time_point > 1000u)
			{
				series_down_flg = 0;
			}
			
			if(buttons_status == BUTTONS_UP)
			{
				;
			}
			else
			{
				ButtonsState = ButtonsStateDownJitter;
				time_point   = GetSysTicks();