交通灯C程序.doc

# include<reg51.h>
# define uchar unsigned char
# define disp_code P0 //把数据送到P0口
# define disp_sel P2
# define OFF 1 //灯灭
# define ON 0 //灯亮

sbit EW_green=P1^0; //东西绿
sbit EW_yellow=P1^1; //东西黄
sbit EW_red=P1^2; //东西红
sbit SN_green=P1^3; //南北绿
sbit SN_yellow=P1^4; //南北黄
sbit SN_red=P1^5; //南北红
bit sign; //定义一个量来判断是东西还是南北通行
uchar time_c1,time_c2;
int count_down=30;
uchar time [2];
uchar disp[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};//数字代码
uchar select[]={0xfe,0xfd}; //数码管段选码
void delay(uchar n) //延时程序
{
uchar i,j,k;
for(i=0;i<n;i++)
for(j=0;j<2;j++)
for(k=0;k<254;k++);
}

void T_countdown() interrupt 1 using 1 //定时器1中断50ms
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
time_c1++;
if(time_c1==20) //20次计数
{
time_c1=0;
count_down--;
if(count_down<0)
count_down=30;
if(count_down>=7)
{
if(sign) //判断sign是1南北通行
{
EW_red=OFF;
EW_green=ON;
SN_yellow=OFF;
SN_red=ON；
}
else // 否者东西通行
{
EW_red=ON;
EW_yellow=OFF;
SN_green=ON;
SN_red=OFF;
}
}
else if(count_down<7&&count_down>3) //在7S到3S时绿灯闪烁
{
if(sign)
{
EW_green=!EW_green;
SN_red=ON;
}
else
{
SN_green=!SN_green;
EW_red=ON;
}
}
else if (count_down<=3&&count_down>=0)//在3S到0S时黄灯亮
{
if(sign)
{
EW_green=OFF;
EW_yellow=ON;
SN_red=ON;
}
else
{
SN_green=OFF;
SN_yellow=ON;
EW_red=ON;
}
}
if(count_down==0)
sign=! sign;
}
}

/*--- 倒计时间显示---*/
void display () interrupt 3 using 3 //定时器1，10mS中断
{
TH1=(65536-10000)/256;
TL1=(65536-10000)%256;
time[0]=count_down/10;
time[1]=count_down%10;
time_c2++;
if(time_c2==2)
time_c2=0;
disp_code=disp[time[time_c2]];
disp_sel=select[time_c2];
}

/*---main program---*/
void main( )
{
delay(10);
delay(10);
delay(10);
time_c1=0;
time_c2=0;
sign=0;
EA=1; //开总中断
ET0=1; //开中断0
ET1=1; //开中断1
TMOD=0x11; //设置定时器1工作及工作方式1
TH0=(65536-50000)/256; //定时器0定时50mS
TL0=(65536-50000)%256;
TH1=(65536-10000)/256; //定时器1定时10mS
TL1=(65536-10000)%256;
TR0=1; //开T0中断
TR1=1; //开T1中断
while (1); //循环等待中断
}