51单片机八路抢答器代码与Proteus仿真 -

//头文件声明
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
//code uchar seven_seg[] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
code uchar seven_seg[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
code uchar seven_bit[] = {0xfe,0xfd,0xfb,0xf7};
sbit run_key = P3^2; //启动按键
sbit buzzer = P3^5; //报警
sbit add_key = P3^6; //加
sbit dec_key = P3^7; //减
uchar player; //定义选手按键的键值参数
uint player_num = 0; //选手号
uchar now_time = 0; //默认复位时间0S
uchar next_time=10; //默认答题时间10s
bit run_flag = 0; //主持人按下开始标志位
bit time_off = 0; //倒计时时间到，或者开始有人抢答成功标志位
uint Count_A = 0; //定时器计数参数
uint Count_B = 0; //定时器计数参数
void delay(uint ms) //延时函数
{
uint i,j;
for(i=ms;i>0;i--)
for(j=110;j>0;j--);
}
void dispaly(uint a,uint b) //a为选手号码，b为时间
{
P2=seven_bit[0];
P0=seven_seg[a]; //显示选手号
delay(5);
P2=seven_bit[1];
P0=0x40; //显示横杠
delay(5);
P2=seven_bit[2];
P0=seven_seg[b/10]; //显示倒计时时间
delay(5);
P2=seven_bit[3];
P0=seven_seg[b%10];
delay(5);
P2=0xff;
}
void keyScan() //按键子程序
{
if(run_key==0) //如果启动按键按下
{
delay(5); //消抖
if(run_key==0)
{
if(now_time!=next_time)
{
if(player_num!=0)
{
now_time=0; //答题结束按键按键复位
player_num=0;
time_off=0;//复位选手按下标志
}
else
{
player_num=0;
run_flag=1; //设置模式调整
buzzer=0;//0.5S声音
now_time=3;
TR0=1; //开启定时器
TR1=1;
}
}
else
{
buzzer=0;//0.5S声音
TR0=1; //开启定时器
TR1=1;
}
}
while(run_key==0); //等待按键放开
}
if(run_flag==0&&time_off==0) //只有没开始抢答的时候可以加减
{
if(add_key==0)
{
delay(5);
if(add_key==0)
{
next_time++; //时间加上去
}
while(add_key==0) dispaly(player_num,next_time); //显示
}
if(dec_key==0)
{
delay(5);
if(dec_key==0)
{
next_time--; //时间减下来
}
while(dec_key==0) dispaly(player_num,next_time); //显示
}
}
}
void EX_Init()
{
/*********初始化定时器/外部中断**********/
TMOD = 0x11; //10ms
TH0 = 0x0D8;
TL0 = 0x0F0;
TH1 = 0x0D8;
TL1 = 0x0F0;
IE = 0x8b; //IE = 0x85;
IT0 = 1;
IT1 = 1;
PX0 = 1;
TR0 = 0; //关闭定时器
TR1 = 0;
}
void main(void)
{
EX_Init(); //初始化
buzzer=1;
P2=0xff;
P1=0xff;
P0=0xff;
while(1) //死循环
{
keyScan(); //按键程序
dispaly(player_num,now_time); //显示
}
}
void Time0() interrupt 1
{
TH0 = 0x0D8; //10ms
TL0 = 0x0F0;
if(run_flag==1) //如果开始抢答
{
player=P1; //读取端口
switch(player)
{
case 0xfe:player_num=1;run_flag=0;time_off=1;TR0=0;TR1=0;now_time=next_time;break; //为第一个选手按下时，选手号=1，定时器停止，时间十秒
case 0xfd:player_num=2;run_flag=0;time_off=1;TR0=0;TR1=0;now_time=next_time;break;
case 0xfb:player_num=3;run_flag=0;time_off=1;TR0=0;TR1=0;now_time=next_time;break;
case 0xf7:player_num=4;run_flag=0;time_off=1;TR0=0;TR1=0;now_time=next_time;break;
case 0xef:player_num=5;run_flag=0;time_off=1;TR0=0;TR1=0;now_time=next_time;break;
case 0xdf:player_num=6;run_flag=0;time_off=1;TR0=0;TR1=0;now_time=next_time;break;
case 0xbf:player_num=7;run_flag=0;time_off=1;TR0=0;TR1=0;now_time=next_time;break;
case 0x7f:player_num=8;run_flag=0;time_off=1;TR0=0;TR1=0;now_time=next_time;break;
case 0xff:break; //全高电平-无人按下，退出
default:player_num=9; break; //出现其它情况，显示9
}
}
}
void Time1() interrupt 3
{
TH1 = 0x0D8;
TL1 = 0x0F0; //10ms
Count_A++;
Count_B++;
if(Count_B<50) //500ms的蜂鸣器提示
buzzer=0;
else buzzer=1;
if(Count_A==100) //每秒钟减一，倒计时
{ Count_A=0;
now_time--; //当前倒计时时间 --
if(now_time<=0) //倒计时结束（到0），那么开始报警，其它复位
{ now_time=0;run_flag=0;TR0=0;TR1=0;time_off=1;buzzer=0; delay(1200);buzzer=1;}
}
}

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