求52单片机八路抢答器带数码管显示的c语言程序

Answer 1

#include<reg52.h>
#define uchar unsigned char
uchar table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f};
sbit rstkey=P3^7;
main()
{
uchar i,key;
while(1)
{
P2=0xff;
i=0;
P0=table[i];
while(1)
{
key=P1;
if(key!=0xff)break;
}
switch(~key)
{
case 0x01:i=1;break;
case 0x02:i=2;break;
case 0x04:i=3;break;
case 0x08:i=4;break;
case 0x10:i=5;break;
case 0x20:i=6;break;
case 0x40:i=7;break;
case 0x80:i=8;break;
default:break;
}
P0=table[i];//显示按下抢答器的号
P2=key;//显示按下键号的LED
while(1)
{
if(rstkey==0)break;//主持人按下复位键则重新开始
}
}
}