void main()
{
unsigned char i,j; unsigned char backup[4][4]={{1,1,1,1},{1,1,1,1},{1,1,1,1},{1,1,1,1}};
TMOD=0x01;
TH0=0xFC;
TL0=0x65;
TR0=1;
EA=1;
ET0=1;
while(1)
{
for(i=0;i<4;i++)
{
for(j=0;j<4;j++)
{
if(keysta[i][j]!=backup[i][j])
{
if(backup[i][j]==0)
{
outbyte(no[0],duan[i*4+j]);
}
backup[i][j]=keysta[i][j];
}
}
}
}
}
void InterruptTimer0() interrupt 1
{
unsigned char i;
static unsigned char keybuf[4][4]={
{0xFF,0xFF,0xFF,0xFF},{0xFF,0xFF,0xFF,0xFF},
{0xFF,0xFF,0xFF,0xFF},{0xFF,0xFF,0xFF,0xFF}};
static unsigned char keyout=0;
TH0=0xFC;
TL0=0x65;
keybuf[keyout][0]=(keybuf[keyout][0]<<1)|KEYIN1;
keybuf[keyout][1]=(keybuf[keyout][1]<<1)|KEYIN2;
keybuf[keyout][2]=(keybuf[keyout][2]<<1)|KEYIN3;
keybuf[keyout][3]=(keybuf[keyout][3]<<1)|KEYIN4;
for(i=0;i<4;i++)
{
if((keybuf[keyout][i]&0x0F)==0x00)
{
keysta[keyout][i]=0;
}
else if((keybuf[keyout][i]&0x0F)==0x0F)
{
keysta[keyout][i]=1;
}
}
keyout++;
keyout=keyout&0x03;
switch(keyout)
{
case 0:KEYOUT4=1;KEYIN1=0;break;
case 1:KEYOUT1=1;KEYIN2=0;break;
case 2:KEYOUT2=1;KEYIN3=0;break;
case 3:KEYOUT3=1;KEYIN4=0;break;
default :break;
}
}
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