#include
sbitADDR0=P1^0;
sbitADDR1=P1^1;
sbitADDR2=P1^2;
sbitADDR3=P1^3;
sbitENLED=P1^4;
sbitKEY_IN_1=P2^4;
sbitKEY_IN_2=P2^5;
sbitKEY_IN_3=P2^6;
sbitKEY_IN_4=P2^7;
sbitKEY_OUT_1=P2^3;
sbitKEY_OUT_2=P2^2;
sbitKEY_OUT_3=P2^1;
sbitKEY_OUT_4=P2^0;
codeunsignedcharLedChar[]={//数码管显示字符转换表
0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,
0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E
};
unsignedcharKeySta[4][4]={//全部矩阵按键的当前状态
{1,1,1,1},
{1,1,1,1},
{1,1,1,1},
{1,1,1,1}
};
voidmain(){
unsignedchari,j;
unsignedcharbackup[4][4]={//按键值备份，保存前一次的值
{1,1,1,1},
{1,1,1,1},
{1,1,1,1},
{1,1,1,1}
};
EA=1;//使能总中断
ENLED=0;//选择数码管DS1进行显示
ADDR3=1;
ADDR2=0;
ADDR1=0;
ADDR0=0;
TMOD=0x01;//设置T0为模式1
TH0=0xFC;//为T0赋初值0xFC67，定时1ms
TL0=0x67;
ET0=1;//使能T0中断
TR0=1;//启动T0
P0=LedChar[0];//默认显示0
while(1){
for(i=0;i<4;i++){//循环检测4*4的矩阵按键
for(j=0;j<4;j++){
if(KeySta[i][j]!=backup[i][j]){//检测按键动作
if(KeySta[i][j]==0){//按键按下时执行动作
P0=LedChar[i*4+j];//将编号显示到数码管
}
backup[i][j]=KeySta[i][j];//更新前一次的备份值
}
}
}
}
}
/*T0中断服务函数，扫描矩阵按键状态并消抖*/
voidInterruptTimer0()interrupt1{
unsignedcharj;
staticunsignedchari=0;//矩阵按键扫描输出索引
staticunsignedcharkeybuf[4][4]={//矩阵按键扫描缓冲区
{0xFF,0xFF,0xFF,0xFF},
{0xFF,0xFF,0xFF,0xFF},
{0xFF,0xFF,0xFF,0xFF},
{0xFF,0xFF,0xFF,0xFF}
};
TH0=0xFC;//重新加载初值
TL0=0x67;
//将一行的4个按键值移入缓冲区
keybuf[i][0]=(keybuf[i][0]<<1)|KEY_IN_1;
keybuf[i][1]=(keybuf[i][1]<<1)|KEY_IN_2;
keybuf[i][2]=(keybuf[i][2]<<1)|KEY_IN_3;
keybuf[i][3]=(keybuf[i][3]<<1)|KEY_IN_4;
//消抖后更新按键状态
for(j=0;j<4;j++){//每行4个按键，所以循环4次
if((keybuf[i][j]&0x0F)==0x00){//连续4次扫描值为0，即4*4ms内都是按下状态时，可认为按键已稳定的按下
KeySta[i][j]=0;
}
elseif((keybuf[i][j]&0x0F)==0x0F){//连续4次扫描值为1，即4*4ms内都是弹起状态时，可认为按键已稳定的弹起
KeySta[i][j]=1;
}
}
//执行下一次的扫描输出
switch(i){//根据索引，释放当前输出引脚，拉低下次的输出引脚
case0:KEY_OUT_1=1;KEY_OUT_2=0;break;
case1:KEY_OUT_2=1;KEY_OUT_3=0;break;
case2:KEY_OUT_3=1;KEY_OUT_4=0;break;
case3:KEY_OUT_4=1;KEY_OUT_1=0;break;
default:break;
}
i=++i&0x03;
}
