#include <reg52.h>
#include <instrin.h>
void delayms(int ms)
{
int i,j;
for(i=1;i<=ms;i++)
for(j=1;j<=123;j++);
}
int main()
{
int i=3,j,flag=0,flag2=0;//标记初始位置,因为和第六个有冲突
while(1)
{
//第一步:四个路口的红、绿、黄灯,初始态为四个路口的红灯全亮之后
if(flag2==0)
P1=0x03;
if(flag==0)
P3=0x03;
if(flag2==0)
{
for(i=1;i<=3;i++)
{delayms(1000);P3--;P1--;}
}
else
{
for(i=1;i<=3;i++)
{delayms(1000);P3--;}
}
P0=0x6D;
P2=0x0B;
//第二步:东西路口的绿灯亮,南北路口的红灯亮
P0=0xB5;
P1=0x05;
for(i=1;i<=2;i++)
{delayms(1000);P1--;}
//第三步:东西路口的绿灯熄灭,黄灯开始闪烁
P0=0xD9;
P2=0x0B;
for(i=1;i<=3;i++)
{delayms(1000);P1--;}
//第四步:东西路口红灯亮,而同时南北路口的绿灯亮
P0=0x6E;
P2=0x0D;
P3=0x09;
flag=1;
for(i=1;i<=2;i++)
{delayms(1000);P3--;}
flag2=1;
//第五步:南北路口的绿灯熄灭,黄灯开始闪烁
P0=0x6F;
P2=0x06;
for(i=1;i<=2;i++)
{delayms(1000);P3--;}
//第六步
P0=0x6E;
P2=0x0D;
for(i=1;i<=2;i++)
{delayms(1000);P3--;}
}
}
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