51单片机四路抢答器程序_51单片机四路抢答器

51单片机四路抢答器程序由刀豆文库小编整理，希望给你工作、学习、生活带来方便，猜你可能喜欢“51单片机四路抢答器”。

#include sbit key1=P3^0;sbit key2=P3^1;sbit key3=P3^2;sbit key4=P3^3;sbit key5=P3^7;sbit BEEP=P2^0;unsigned char temp;unsigned char pulse_number1=9;unsigned char code TAB[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};

void delay_100ms(unsigned int t){ unsigned char i,j,k;for(i=t;i>0;i--){

for(j=200;j>0;j--);

{

for(k=248;k>0;k--);

} } } void beep(){

BEEP=1;

delay_100ms(100);

BEEP=0;

}

void T0_int()interrupt 1

{

static unsigned char count;unsigned char a=1;count++;

TH0=(65536-50000)/256;

TL0=(65536-50000)%256;if(count==20){

count=0;

P0=TAB[pulse_number1--];

}

beep();

if(pulse_number1==0)

{

P0=TAB[0];

TR0=0;

while(a)

{ beep();if(!key5)a=0;

}

}

}

void main(){

bit flag;

temp=0x00;

P2=temp;

P0=0x3f;

TMOD=0x01;

TH0=(65536-50000)/256;TL0=(65536-50000)%256;ET0=1;EA=1;

TR0=1;

while(!flag)

{

}

while(flag);}

if(!key1){P0=0x06;beep();flag=1;TR0=0;}

else if(!key2){P0=0x5b;beep();flag=1;TR0=0;} else if(!key3){P0=0X4f;beep();flag=1;TR0=0;} else if(!key4){P0=0x66;beep();flag=1;TR0=0;}