#include"reg52.h"
char scan_key(void);
void delay(unsigned int i);
sbit P30=P3^0;
void main()
{
unsigned char led[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};
unsigned char led1[]={0xbf,0x8c,0x86};
unsigned char i;
P1=led1[0];
P30=1;
P0=0xff;
while(1)
{
i=scan_key();
if(i==-1)continue;
else if(i!=8)
{
P1=led[i];
delay(10000);
P1=led1[2];
delay(50000);
P1=led1[0];
}
else
{
P1=led[i];
delay(10000);
P1=led1[1];
P30=0;
delay(50000);
P1=led1[0];
P30=1;
}
}
}
char scan_key()
{
char i,temp,m,n;
bit find=0;
P2=0xf0;
i=P0;
i &=0x0f;
if(i!=0x0f)
{
delay(1200);
i=P0;
i &=0x0f;
if(i!=0x0f)
{
for(i=0;i<4;i++)
{
P2=0xfe<<i;
temp=~P0;
temp=temp & 0x0f;
if(temp!=0x00)
{
m=i;
find=1;
switch(temp)
{
case 0x01:n=0;break;
case 0x02:n=1;break;
case 0x04:n=2;break;
case 0x08:n=3;break;
default:break;
}
break;
}
}
}
}
if(find==0)
{
return -1;
}
else
{
return(n*4+m);
}
}
void delay(unsigned int i)
{
unsigned int k;
for(k=0;k<i;k++);
}
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