c语言四路抢答器程序,单片机四路抢答器源程序

#include

typedef unsigned char u8;

typedef unsigned int  u16;

sbit led3=P2^2;

sbit led2=P2^3;

sbit led1=P2^4;

sbit key1=P3^2;

sbit key2=P3^3;

sbit beep=P1^5;

void delay(u16 i)

{

u8 a;

while(i--)

{

for(a=0;a<125;a++)

{

;

}

}

}

u16 code duanxuan[16]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

void weixuan(u16 i)

{

switch(i)

{

case (0) : led1=0;led2=0;led3=0;break;

case (1) : led1=0;led2=0;led3=1;break;

case (2) : led1=0;led2=1;led3=0;break;

case (3) : led1=0;led2=1;led3=1;break;

case (4) : led1=1;led2=0;led3=0;break;

case (5) : led1=1;led2=0;led3=1;break;

case (6) : led1=1;led2=1;led3=0;break;

case (7) : led1=1;led2=1;led3=1;break;

}

}

void display(u16 i,u16 j)

{

weixuan(i);

P0=duanxuan[j];

}

u16 a=0;  //判断是否有选手按下

void saomiao ()

{

P1=0xf0;

if(P1!=0xf0)

{

delay(10);

if (P1!=0xf0)

{

P1=0X7f;

switch(P1)

{

case(0x77) :  a=1;break;

case(0x7b) :  a=2;break;

case(0x7d) :  a=3;break;

case(0x7e) :  a=4;break;

}

P1=0xf0;

while(P1!=0xf0);

}

}

}

u16 i=0,j=0,n=10,m=0,k,weigui[3],v=0;                 //m=1表示按下开始

void daojishi()

{

P0=0x00;

display(0,n%10);

delay(1);

P0=0x00;

display(1,n/10);

delay(1);

if(n==0)

{

TR0=0;

}

}

void main()

{

EA=1;

EX0=1;

IT0=1;

EX1=1;

IT1=1;

ET0=1;

TMOD=0X01;

TH0=(65536-1000)/256;

TL0=(65536-1000)%256;

while(1)

{

v=0;

P0=0x00;

if(m==0)

{

saomiao();

if(a!=0)

{

while(1)

{

if(v==1)

{

break;

}

saomiao();

if(a!=0)

{

weigui[j]=a;

if(j>0)

{

if(weigui[j]!=weigui[j-1])

{

j++;

}

}

if(j<1)

{

j++;

}

}

a=0;

for(k=0;k

{

P0=0x00;

display(k,weigui[k]);

beep=~beep;

delay(10);

}

if(j==3)

{

while(1)

{

for(k=0;k

{

P0=0x00;

display(k,weigui[k]);

beep=~beep;

delay(1);

}

if(v==1)

{

break;

}

}

}

}

}

}

if(m==1)

{

daojishi();                         //开始倒计时

saomiao();

if(a!=0)

{

while(1)

{

P0=0x00;

display(0,a);

delay(10);

if(v==1)

{

break;

}

}

}

}

}

}

void zhongduan0() interrupt 0

{

delay(10);

if(key1==0)

{

TR0=1;

m=1;

while(key1==0);

}

}

void zhongduan1() interrupt 2

{

delay(10);

if(key2==0)

{

n=10;

m=0;

a=0;

j=0;

v=1;

TR0=0;

while(key2==0);

}

}

void dingshiqi() interrupt 1

{

i++;

if(i==1000)

{

i=0;

n--;

}

TH0=(65536-1000)/256;

TL0=(65536-1000)%256;

}