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源程序如下
#include<at89x51.h>
#define uchar unsigned char
#define uint unsigned int
sbit k1=P1^7;
unsigned char code disp_code[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x40,0x00,0x40};
uchar biaozhi,xuanshou,s,z,z1,tiaoshi,bianliang1,bianliang2;
signed char time[]={0,0};
void delay(uint x) //延时函数
{
uint i,j;
for(i=x;i>0;i--)
for(j=125;j>0;j--);
}
void xianshi() //显示函数
{
P3_6=1;
P3_0=0;
P3_7=1;
P0=disp_code[xuanshou];
delay(5);
if(xuanshou!=10)
{
P3_0=1;
P3_6=0;
P3_7=1;
P0=disp_code[time[0]/10];
delay(5);
P3_0=1;
P3_6=1;
P3_7=0;
P0=disp_code[time[0]%10];
delay(5);
}
if(tiaoshi==1)
{
P3_0=1;
P3_6=0;
P3_7=1;
P0=disp_code[time[1]/10];
delay(5);
P3_0=1;
P3_6=1;
P3_7=0;
P0=disp_code[time[1]%10];
delay(5);
}
P3_0=1;
P3_6=1;
P3_7=1;
}
void anjian() //按键的识别和代码的输出
{
if(biaozhi==1)
{
if(P2!=0xff)
{
if(P2_0==0)
{
xuanshou=1;
}
if(P2_1==0)
{
xuanshou=2;
}
if(P2_2==0)
{
xuanshou=3;
}
if(P2_3==0)
{
xuanshou=4;
}
if(P2_4==0)
{
xuanshou=5;
}
if(P2_5==0)
{
xuanshou=6;
}
if(P2_6==0)
{
xuanshou=7;
}
if(P2_7==0)
{
xuanshou=8;
}
s=0;
time[0]=bianliang2;
biaozhi=2;
}
}
if(biaozhi==0)
{
if(P2!=0xff)
{
TR1=1;
}
}
}
void int1(void) interrupt 3 //蜂鸣器驱动函数的设计
{
k1=0;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
z++;
if(z==5)
{
z=0;
z1++;
k1=~k1;
}
if(z1==3)
{
k1=1;
z1=0;
TR1=0;
biaozhi=0;
xuanshou=10;
}
}
void int4(void) interrupt 0 //调节抢答时间函数
{
biaozhi=3;
tiaoshi=0;
xuanshou=12;
time[0]++;
bianliang1=time[0];
}
void int5(void) interrupt 2 //调节做题时间函数
{
tiaoshi=1;
biaozhi=3;
xuanshou=10;
time[1]++;
bianliang2=time[1];
}
void int0(void) interrupt 1 //中断递增
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
s++;
if(s==20)
{
s=0;
time[0]--;
}
if(time[0]==0)
{
time[0]=0;
TR0=0;
TR1=1;
}}
void main()//主函数
{
IT0=1; //开启外部中断0和1，用来控制强大时间和做题时间
EX0=1;
IT1=1;
EX1=1;
TMOD=0x11; //定时中断的初始化
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
TH1=(65536-50000)/256;
TL1=(65536-50000)%256;
TF1=0;
ET1=1;
TF0=0;
EA=1;
ET0=1;
xuanshou=10; //xuanshou=10 是让其显示“--”
P2=0xff;
P1_7=1;
while(1) //死循环
{
if(biaozhi!=3) //判断主持开始抢答键是否按下
{
if(P3_1==0)
{
delay(2);
if(P3_1==0)
{
time[0]=bianliang1; //把调节好的抢答时间代入显示time[0]
TR0=1;
biaozhi=1;
xuanshou=11;
}}}
if(P1_2==0) //判断是否按下调节时间 的确定按钮
{
delay(2);
if(P1_2==0)
{
TR0=0;
TR1=0;
biaozhi=0;
tiaoshi=0;
xuanshou=10;
}}
if(P1_4==0)
{
delay(150);
if(P1_4==0)
{
biaozhi=3;
tiaoshi=0;
xuanshou=12;
time[0]--;
if(time[0]<=0)
{
time[0]=0;
}}}
if(P1_5==0)
{
delay(150);
if(P1_5==0)
{
tiaoshi=1;
biaozhi=3;
xuanshou=10;
time[1]--;
if(time[1]<=0)
{
time[1]=0;
}} }
anjian();
xianshi();
}}
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