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簡(jiǎn)單四路搶答
源代碼
#include <reg52.h>
sbit key1=P3^0;
sbit key2=P3^1;
sbit key3=P3^2;
sbit key4=P3^3;
sbit key5=P3^7;
sbit BEEP=P2^0;
bit flag;
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()
{
temp=0x00;
P2=temp;
P0=0x3f;
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
ET0=1;
EA=1;
TR0=1;
}
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;}
}
while(flag);
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