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標題: 半阻塞式按鍵判斷程序 [打印本頁]

作者: clapp 時間: 2026-2-23 22:35
標題: 半阻塞式按鍵判斷程序
參考江協科技的定時器實現非阻塞式按鍵程序中對按鍵狀態判斷的思路，搞了一個半阻塞式按鍵判斷程序，挺有意思。

#include <STC8H.H>
#include "delay.h"
#include "keyx3.h"

sbit k1 = P3^2;
sbit k2 = P3^3;
sbit k3 = P3^4;

unsigned char num;

//==============================
unsigned char keynum()
{
unsigned char temp;
temp = num;
num = 0;
return temp;
}

unsigned char key_getnum()//輸出與實際電平相反，有數值代表按下，0為未按下。
{
if(k1 == 0)
{
return 1;
}

if(k2 == 0)
{
return 2;
}

if(k3 == 0)
{
return 3;
}

return 0;
}

//--------------------------------------------
void key_tick()//在主函數輪循
{
static unsigned char currstate, prevstate;

delayms(20);//阻塞延時
prevstate = currstate;    //當前狀態傳遞到之前狀態
currstate = key_getnum();  //按鍵值傳遞到當前狀態

if(currstate != 0 && prevstate == 0)
{
num =  currstate;
}

}

作者: clapp 時間: 2026-3-10 22:53
51單片機非阻塞多按鍵多功能程序，基于江科協教程修改。
#ifndef _KEYX3_H_
#define _KEYX3_H_

#define key_count  3

#define key1  0
#define key2  1
#define key3  2

#define hold    0x01//按住不放
#define down    0x02//按下時刻
#define up    0x04//松開時刻
#define single    0x08//單擊
#define ddouble    0x10//雙擊
#define llong    0x20//長按
#define repeat    0x40//重復

void key_tick();//放1ms中斷定時器中
unsigned char key_check(unsigned char n, unsigned char flag);//n按鍵名，flag按鍵動作

#endif

作者: clapp 時間: 2026-3-10 22:56
基于江科協非阻塞按鍵教程修改，用于STC單片機環境多按鍵多功能按鍵程序
#ifndef _KEYX3_H_
#define _KEYX3_H_

#define key_count  3

#define key1  0
#define key2  1
#define key3  2

#define hold    0x01//按住不放
#define down    0x02//按下時刻
#define up    0x04//松開時刻
#define single    0x08//單擊
#define ddouble    0x10//雙擊
#define llong    0x20//長按
#define repeat    0x40//重復

void key_tick();//放1ms中斷定時器中
unsigned char key_check(unsigned char n, unsigned char flag);//n按鍵名，flag按鍵動作

#endif
//=======================================================

#include <STC8H.H>
#include "keyx3.h"

#define pressed 1
#define unpressed  0

#define time_double  200
#define time_long 2000
#define time_reper 100

sbit k1 = P3^2;
sbit k2 = P3^3;
sbit k3 = P3^4;
sbit led7 = P2^7;

      //7    6    5    4    3       2    1    0
unsigned char key_flag[key_count]; //空  repeat  long  double  single up    down hold
      //    0x40 0x20  0x10 0x08    0x04 0x02 0x01
//===========================================================

unsigned char key_getstate(unsigned char n)
{
if(n == key1)
{
if(k1 == 0)
{
return pressed;
}
}

else if(n == key2)
{
if(k2 == 0)
{
return pressed;
}
}

else if(n == key3)
{
if(k3 == 0)
{
return pressed;
}
}

return unpressed;
}

//-------------------------------------------------------------------------
unsigned char key_check(unsigned char n, unsigned char flag)//通過對這參數各位檢查，得出結果
{
if(key_flag[n] & flag)
{
if(flag != 0x01)
{
key_flag[n] &= ~flag;
}
return 1;
}
return 0;

}

void key_tick()
{
static unsigned char count, i;
static unsigned char prevstate[key_count], currstate[key_count];
static unsigned char s[key_count];
static unsigned int  time[key_count];

for(i = 0; i < key_count; i++)
{
if(time[i] > 0 )
{
time[i]--;
}

}

count++;
if(count >= 20)
{
count = 0;
led7 = ~led7;

for(i = 0; i < key_count; i++)
{
prevstate[i] = currstate[i];
currstate[i] = key_getstate(i);

//--基礎事件---------------------------------------
//--按下與松開，電平觸發-----------------------------
if(prevstate[i] == pressed)
{
//hold = 1
key_flag[i] |= hold;
}
else
{
//hold = 0
key_flag[i] &= ~hold;
}

//--松開后按下，下降沿觸發------------------------------
if(prevstate[i] == unpressed && currstate[i] == pressed)
{
//down = 1
key_flag[i] |= down;
}

//--按下后松開，上升沿觸發------------------------------
if(prevstate[i] == pressed && currstate[i] == unpressed)
{
//up = 1
key_flag[i] |= up;
}

//--高級事件-----------------------------------------------
if(s[i] == 0)//空閑
{
if(currstate[i] == pressed)
{
time[i] = time_long;//設定長按時間
s[i] = 1;
}
}

else if(s[i] == 1)//按鍵已按下
{
if(currstate[i] == unpressed)
{
     time[i] = time_double;//設定雙擊時間
s[i] = 2;
}
else if(time[i] == 0)//長按時間到
{
time[i] = time_reper;
//llong = 1
key_flag[i] |= llong;
s[i] = 4;
}
}

else if(s[i] == 2)//按鍵已松開
{
if(currstate[i] == pressed)
{
//double = 1;
key_flag[i] |= ddouble;
s[i] = 3;
}
else if(time[i] == 0)//設定雙擊時間到
{
//single = 1;
key_flag[i] |= single;
s[i] = 0;
}
}

else if(s[i] == 3)//按鍵已雙擊
{
if(currstate[i] == unpressed)
{
s[i] = 0;
}
}

else if(s[i] == 4)//按鍵已長按
{
if(currstate[i] == unpressed)
{
s[i] = 0;
}
else if(time[i] == 0)//重復時間到
{
time[i] = time_reper;
//repeat = 1
key_flag[i] |= repeat;
s[i] = 4;
}

}

}//for大括號

//------------------------------------------
}//20ms大括號
}//函數大括號

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