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/////4×4矩阵键盘按键为1-16，按键显示0-9、a-f；
//////////////////
#include
#define uchar unsigned char
uchar key=0;
uchar code
table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83, 0xc6,0xa1,0x86,0x8e,0xc0};
void show(uchar key)
{
P0=table[key];//显示数值
}
void Scan_key()//扫描键盘
{
uchar m;
P1=0xff;//数码管全亮
P2=0x0f;//P2口赋初值低位1高位0
m=P2;
switch (m)
{
case 0x0e:
{
P2=0xf0;
switch (m)
{
case 0xe0:{key=0;show(key);break;}
case 0xd0:{key=1;show(key);break;}
case 0xb0:{key=2;show(key);break;}
case 0x70:{key=3;show(key);break;}
default:break;
}
break;
}
case 0x0d:
{
P2=0xf0;
m=P2;
switch (m)
{
case 0xe0:{key=4;show(key);break;}
case 0xd0:{key=5;show(key);break;}
case 0xb0:{key=6;show(key);break;}
case 0x70:{key=7;show(key);break;}
default:break;
}
break;
}
case 0x0b:
{
P2=0xf0;
m=P2;
switch (m)
{
case 0xe0:{key=8;show(key);break;}
case 0xd0:{key=9;show(key);break;}
case 0xb0:{key=10;show(key);break;} case 0x70:{key=11;show(key);break;} default:break;
}
break;
}
case 0x07:
{
P2=0xf0;
m=P2;
switch (m)
case 0xe0:{key=12;show(key);break;}
case 0xd0:{key=13;show(key);break;}
case 0xb0:{key=14;show(key);break;}
case 0x70:{key=15;show(key);break;}
default:break;
}
break;
}
default :break;
}
}
void main()
{
while(1)
{
Scan_Key();
}
}
