利用delay()的延时消除按键抖动,用while(!K)等语句检测松手动作,这种按键处理程序,简单易懂,许多初学者喜欢使用。但如果程序端口有检测信号的话,十几二十毫秒的延时错过了不少检测信号。如果按键一直按着或按键损坏短接了,程序就会一直停留在这里不能运行了。设置2毫秒的中断延时,利用中断延时避开主程序过长的周期。将按键检测分为两种状态,在检测按键按下状态中完成延时消抖,后进入检测按键松开。
水平有限,贴上程序大家共同探讨。
单片机源程序如下:
- #include <reg52.h>
- typedef signed long slong;
- typedef signed int sint;
- typedef signed char schar
- typedef unsigned long ulong;
- typedef unsigned int uint;
- typedef unsigned char uchar;
- #define SEG_DB P0 //数码管
- sbit SEG_WE = P2^7; //数码管位选
- sbit SEG_DU = P2^6; //数码管段选
- sbit Keyin1 = P3^4;
- //sbit Keyin2 = P3^5;
- //sbit Keyin3 = P3^6;
- //sbit Keyin4 = P3^7;
- sbit Keyout1 = P3^0;
- //sbit Keyout2 = P3^1;
- //sbit Keyout3 = P3^2;
- //sbit Keyout4 = P3^3;
- bit Keytan=1;
- uchar T0RH,T0RL;
- uchar Ledtmp[6];
- uint cou;
- uchar code Ledchar[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
- 0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
- void ConfigTimer0(uchar ms);
- void KeyDrive();
- void main()
- {
- schar j;
- uchar buf[6];
- Keyout1 = 0;
- ConfigTimer0(2);
- Ledtmp[0] = Ledchar[2];
- while (1)
- {
- KeyDrive();
- buf[0] = cou%10;
- buf[1] = cou/10%10;
- buf[2] = cou/100%10;
- buf[3] = cou/1000%10;
- buf[4] = cou/10000%10;
- buf[5] = cou/100000%10;
- for (j=5;j>=1;j--) //消隐高位数的0
- {
- if (buf[j] == 0)
- Ledtmp[j] = 0x00;
- else
- break;
- }
- for (;j>=0;j--)
- {
- Ledtmp[j] = Ledchar[buf[j]];
- }
- }
- }
- void KeyDrive()
- {
- static Keybuf = 1;
- if (Keybuf != Keytan)
- {
- if (Keybuf == 1)
- {
- cou++;
- }
- Keybuf = Keytan;
- }
- }
- void LedPlay()
- {
- static uchar i=0;
- SEG_DB = 0xff;
- SEG_WE = 1;
- SEG_WE = 0;
- SEG_DB = Ledtmp[i];
- SEG_DU = 1;
- SEG_DU = 0;
- SEG_DB = ~(0x20>>i);
- SEG_WE = 1;
- SEG_WE = 0;
- i++;
- if (i == 6)
- i = 0;
- }
- void KeyScan()
- {
- static uchar kmode=0;
- static uchar i;
- switch (kmode)
- {
- case 0: if (Keyin1 == 0) //检测按键按下
- {
- i++;
- if (i == 7) //7次相当于延时2msx7=14毫秒
- {
- i = 0;
- kmode = 1; //按键稳定,转换进入检测按键松手模式
- Keytan = 0; //按键动作标志
- }
- }
- else
- i = 0; //没有7次连续检测到按键按下,说明没有稳定,时间清零
- case 1: if (Keyin1 == 1) //检测按键松开
- {
- Keytan = 1; //按键松开标志
- kmode = 0; //进入检测按键按下模式
- }
- }
- }
- void ConfigTimer0(uchar ms)
- {
- ulong tmp;
- tmp = 11059200/12;
- tmp = (tmp*ms)/1000;
- tmp = 65536 - tmp;
- T0RH = (uchar)(tmp>>8);
- T0RL = (uchar)tmp;
- TH0 = T0RH;
- TL0 = T0RL;
- TMOD &= 0xf0;
- TMOD |= 0x01;
- TR0 = 1;
- ET0 = 1;
- EA = 1;
- }
- void InterruptTimer0() interrupt 1
- {
- TH0 = T0RH;
- TL0 = T0RH;
- LedPlay();
- KeyScan();
- }
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