#include

sbit k1=P1^0;

sbit k2=P1^1;

sbit k3=P1^2;

sbit k4=P1^3;

sbit k5=P1^4;

sbit k6=P1^5;

sbit k7=P1^6;

sbit k8=P1^7;

sbit k_1=P3^0;

sbit k_2=P3^1;

sbit k_3=P3^2;

sbit k_4=P3^3;

sbit beep=P3^7;

unsigned int ms;          //毫秒

unsigned int s,t0;              //显示值

unsigned char biaozhi,buzhou=0;        //抢答标志,步骤

unsigned char led[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x40};

void delay(unsigned int t)//延时

{

unsigned int i,j;

for(i=0;i

for(j=0;j<110;j++);

}

void disp()//显示

{

unsigned int ge,shi;

ge=s%10;          //提取个位

shi=s/10;  //提取十位

P2=0xfe;

P0=led[ge];  //显示个位

delay(5);

P2=0xfd;

P0=led[shi];        //显示十位

delay(5);

}

void ea()//显示开机界面

{

unsigned char ci;

while(ci<200)//循环200次(持续一段时间)

{

P2=0xfe;

P0=0x77;  //显示A

delay(5);

P2=0xfd;

P0=0x79;        //显示E

delay(5);

ci++;

}

}

void keys()        //抢答按键

{ /*抢答之后显示数值,改变标志终止抢答*/

if(k1==0&&biaozhi==0){s=1;biaozhi=1;beep=0;delay(500);beep=1;}

if(k2==0&&biaozhi==0){s=2;biaozhi=1;beep=0;delay(500);beep=1;}

if(k3==0&&biaozhi==0){s=3;biaozhi=1;beep=0;delay(500);beep=1;}

if(k4==0&&biaozhi==0){s=4;biaozhi=1;beep=0;delay(500);beep=1;}

if(k5==0&&biaozhi==0){s=5;biaozhi=1;beep=0;delay(500);beep=1;}

if(k6==0&&biaozhi==0){s=6;biaozhi=1;beep=0;delay(500);beep=1;}

if(k7==0&&biaozhi==0){s=7;biaozhi=1;beep=0;delay(500);beep=1;}

if(k8==0&&biaozhi==0){s=8;biaozhi=1;beep=0;delay(500);beep=1;}

}

void set_time()        //设置时间,一次5秒

{

if(k_2==0&&biaozhi==0&&s>0)

{

while(k_2==0);

s-=5;

}

if(k_3==0&&biaozhi==0&&s<95)

{

while(k_3==0);

s+=5;

}

}

void main()

{

/*配置定时器*/

TMOD=0x01;

TH0=(65536-50000)/256;

TL0=(65536-50000)%256;

EA=1;

ET0=1;

ea();//开机显示EA

while(1)

{

if(buzhou==0)         set_time();

if(k_1==0&&biaozhi==0&&P1==0xff&&s!=0)//开始抢答

{

while(k_1==0);

for(t0=3;t0>0;t0--)

{

P2=0xfe;

P0=led[t0]; //3秒倒计时

beep=0;delay(80);beep=1;

delay(1000);

}

P2=0xfc;

P0=0x40;

beep=0;delay(1000);beep=1;

buzhou=1;

TR0=1;        //打开定时器开关

}

if(P1!=0xff&&buzhou==1&&t0==0) //抢答

{

TR0=0;//关闭定时器开关

keys();

buzhou=3;

}

if(k_4==0)        //清除

{

beep=k_4;

while(k_4==0);

TR0=0;

s=0;

biaozhi=0;

buzhou=0;

beep=1;

}

disp(); //显示

}

}

void zhongduan() interrupt 1

{ /*启动定时器*/

TH0=(65536-50000)/256;

TL0=(65536-50000)%256;//50000=50毫秒

ms++;

if(ms==20&&s>0)//50毫秒x20次=1秒

{

ms=0;

s--;  //倒计时

if(s==0)

{

TR0=0;

biaozhi=0;

buzhou=0;

beep=0;

}

}

}