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#include<reg52.h>
#define segport P0
#define seatport P1
#define keyport P2
unsigned char segt[17]={0x3f,0x06,0x5b,0x4f,0x66,
0x6d,0x7d,0x07,0x7f,0x6f,
0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};
unsigned char seatt[6]={0x1f,0x2f,0x37,0x3b,0x3d,0x3e};
void delay(int s)
{
for(s;s>0;s--);
}
void showsingle(int d)
{
seatport=seatt[5];
segport=segt[d];
delay(50);
}
void delay1ms_k(int s)
{
int j;
for(s;s>0;s--)
for(j=150;j>0;j--);
}
int keys()
{
int key,row,col;
unsigned char rowcode,colcode;
key=16;
keyport=0x0ff;
keyport=keyport&0x0f;
if((keyport&0x0f)!=0x0f)
{
delay1ms_k(10);
if((keyport&0x0f)!=0x0f)
{
colcode=(keyport&0x0f);
switch(colcode)
{
case 0x07:col=3;break;
case 0x0b:col=2;break;
case 0x0d:col=1;break;
case 0x0e:col=0;break;
}
keyport=0x0f0;
rowcode=(keyport&0x0f0);
switch(rowcode)
{
case 0x70:row=3;break;
case 0x0b0:row=2;break;
case 0x0d0:row=1;break;
case 0x0e0:row=0;break;
}
key=row*4+col;
}
}
return key;
}
void main(void)
{
int key=16;
while(1)
{
key=keys();
showsingle(key);
}
}
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