4x4.c

4x4键盘

#include<at89x51.h>
 unsigned int lie=0,hang=0,h=0,l=0,hehe[]={ 0xc0,0xf9,0xa4,0xb0,
 											0x99,0x92,0x82,0xf8,
											0x80,0x90,0x88,0x83,
											0xc6,0xa1,0x86,0x8e};

void time0();
void main()
{P2=1;

TMOD=0X01;
TH0=0XFF;
TL0=0XE2;
EA=1;
ET0=1;
TR0=1;
while(1);

}


void time0() interrupt 1
{
P1=0x0f;
hang=P1;	 
P1=0XF0;
lie=P1;	 //列
P1=0x00;
if(hang==0x0f&&lie==0xf0)
{
 goto loop1;
}else
{
hang=~hang;
hang=hang&0X0F;	//行
lie=~lie;
lie=lie&0XF0;
while(hang!=0)
{
 hang=hang/2;
 h++;
}
while(lie!=0)
{
 lie=lie/2;
 l++;
}
h=(h-2)*4+l-1;
P3=hehe[h];
l=0;
h=0;
}
loop1:
TH0=0XFF;
TL0=0XE2;
}