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#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
char s;
uchar num=0;
char time=20; //搶答時(shí)間
char datitime=30; //答題限時(shí)時(shí)間
uint tt,t1; //T0,T1定時(shí)器定一秒時(shí)
bit flag,s_flag=1,b_flag,fall_flag; //標(biāo)志位
bit K_startcountflag,K_timecountflag; //時(shí)間調(diào)整標(biāo)志位
sbit K0=P3^0;
sbit beep=P3^7; //蜂鳴器輸出口
sbit rled=P3^1; //指示燈輸出口
sbit K1=P1^0;
sbit K2=P1^1;
sbit K3=P1^2;
sbit K4=P1^3;
sbit K_Time=P3^2; //答題計(jì)時(shí)鍵
sbit K_startcount=P3^3; //開始搶答時(shí)間調(diào)整鍵
sbit K_timecount=P3^4; //答題計(jì)時(shí)時(shí)間調(diào)整鍵
void delay(uchar ms)
{
uchar y;
for(;ms>0;ms--)
for(y=120;y>0;y--);
}
uchar code tabledu[]={0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71
};
uchar code tablewe[]={0XFE,0XFD,0XFB,0XF7};
void T0_Init(void)
{
TMOD=0X01;
TH0=(65536-2000)/256;
TL0=(65536-2000)%256;
TH1=(65536-2000)/256;
TL1=(65536-2000)%256;
ET0=1;
ET1=1;
EA=1;
P0=0;
}
void Key_Scan(void) //開始鍵掃描
{
if(K0==0)
{
delay(10);
if(K0==0)
{
while(!K0);
TR0=1;
s=time;
tt=0;
flag=1;
s_flag=1;
b_flag=1;
num=0;
beep=1;
rled=1;
fall_flag=0; //清除違規(guī)標(biāo)志位
K_startcountflag=0;
K_timecountflag=0;
}
}
}
void Scan(void) //四路熱鍵掃描(哪個(gè)鍵先按下,哪個(gè)優(yōu)先級(jí)最高)
{
if(K1==0)
{
delay(10);
if(K1==0)
{
while(!K1);
num=1; //數(shù)碼管顯示1號(hào)"1"
TR0=0; //關(guān)閉定時(shí)器0,時(shí)間停止
TR1=1; //打開定時(shí)器1,使揚(yáng)聲器響一聲
s_flag=0; //關(guān)閉開始鍵標(biāo)志位,使再按其他三個(gè)鍵不會(huì)響應(yīng)
}
}
if(K2==0) //下面三個(gè)鍵的處理同上
{
delay(10);
if(K2==0)
{
while(!K2);
num=2;
TR0=0;
TR1=1;
s_flag=0; //重要
}
}
if(K3==0)
{
delay(10);
if(K3==0)
{
while(!K3);
num=3;
TR0=0;
TR1=1;
s_flag=0;
}
}
if(K4==0)
{
delay(10);
if(K4==0)
{
while(!K4);
num=4;
TR0=0;
TR1=1;
s_flag=0;
}
}
}
void display(void)
{
if(flag==1) //開始鍵按下,開始計(jì)時(shí)搶答
{
if(num!=0) //如果有人搶答,則顯示相應(yīng)的幾號(hào)
{
P0=tabledu[num]; //顯示幾號(hào)搶到了
P2=tablewe[0];
delay(2);
P0=0;
P2=0XFF;
}
else //否則沒人搶答,則前面不顯示幾號(hào)
{
P0=0;
P2=0XFF;
}
P0=tabledu[s/10]; //下面為顯示搶答倒計(jì)時(shí)
P2=tablewe[2];
delay(2);
P0=0;
P2=0XFF;
P0=tabledu[s%10];
P2=tablewe[3];
delay(2);
P2=0XFF;
P0=0;
}
}
void Time_Scan(void) //調(diào)整時(shí)間鍵掃描
{
if(K_startcount==0) //搶答時(shí)間調(diào)整
{
delay(10);
if(K_startcount==0)
{
while(!K_startcount);
time++;
if(time==50)
{
time=20;
}
K_startcountflag=1; //將搶答時(shí)間標(biāo)志位置1
K_timecountflag=0; //同時(shí)關(guān)閉答題時(shí)間標(biāo)志位
}
}
if(K_timecount==0) //答題時(shí)間調(diào)整
{
delay(10);
if(K_timecount==0)
{
while(!K_timecount);
datitime++;
if(datitime==60)
{
datitime=30;
}
K_timecountflag=1;
K_startcountflag=0;
}
}
}
void main(void)
{
T0_Init();
while(1)
{
Key_Scan(); //開始鍵掃描
if((flag==0)&(s_flag==1)) //當(dāng)開始鍵沒按下及沒有人違規(guī)時(shí)才可進(jìn)行時(shí)間調(diào)整
{
Time_Scan();
}
if((flag==1)&(s_flag==0))//當(dāng)開始鍵按下及有人搶答才進(jìn)行開始回答計(jì)時(shí)倒計(jì)時(shí)
{
if(K_Time==0)
{
delay(10);
if(K_Time==0)
{
while(!K_Time);
s=datitime;
TR0=1;
tt=0;
TR1=1;
}
}
}
if((flag==0)&(s_flag==1)) //違規(guī)
{
Scan();
if(num!=0) //開始鍵沒有按下時(shí),有人按下了搶答器,則置違規(guī)標(biāo)志位
{
fall_flag=1;
rled=0;
}
}
if((flag==1)&(s_flag==1)) //如果開始鍵按下且搶答鍵沒有人按下,則進(jìn)行八路搶答鍵掃描
{
Scan();
}
display(); //顯示到數(shù)碼管上
}
}
void timer0(void) interrupt 1
{
TH0=(65536-2000)/256; //2ms
TL0=(65536-2000)%256;
if(b_flag) //開始(START)鍵按下,嘟一聲(長1秒),表示開始搶答
{
beep=~beep;
}
else
beep=1;
if(s<5) //搶答時(shí)間快到報(bào)警,隔1秒響一聲且紅燈閃爍,響三聲
{
if(s%2==0)
{
b_flag=1;
rled=0;
}
else
{
b_flag=0;
rled=1;
}
}
tt++;
if(tt==500) //1秒
{
tt=0;
s--;
b_flag=0; //關(guān)閉開始鍵按下響一秒的嘟聲
if(s==-1)
{
s=20;
TR0=0;
flag=0; //顯示F FF
s_flag=1;
num=0;
rled=1;
}
}
}
void timer1(void) interrupt 3 //定時(shí)器1處理有人按下?lián)尨鹌鬣揭宦?長1秒)
{
TH1=(65536-2000)/256;
TL1=(65536-2000)%256;
beep=~beep;
t1++;
if(t1==500)
{
t1=0;
TR1=0;
}
}
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