說明：東西向綠燈亮若干秒，黃燈閃爍5次后紅燈亮， 紅燈亮后，南北向由紅燈變為綠燈，若干秒后南北向黃燈閃爍5此后變紅燈，東西向變綠燈，如此重復。
#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
sbit RED_A=P0^0; //東西向燈
sbit YELLOW_A=P0^1;
sbit GREEN_A=P0^2;
sbit RED_B=P0^3; //南北向燈
sbit YELLOW_B=P0^4;
sbit GREEN_B=P0^5;
uchar Flash_Count=0,Operation_Type=1; //閃爍次數，操作類型變量
//延時
void DelayMS(uint x)
{
uchari;
while(x--)for(i=0;i<120;i++);
}
//交通燈切換
void Traffic_Light()
{
switch(Operation_Type)
{
case1: //東西向綠燈與南北向紅燈亮
RED_A=1;YELLOW_A=1;GREEN_A=0;
RED_B=0;YELLOW_B=1;GREEN_B=1;
DelayMS(2000);
Operation_Type=2;
break;
case2: //東西向黃燈閃爍，綠燈關閉
DelayMS(300);
YELLOW_A=~YELLOW_A;GREEN_A=1;
if(++Flash_Count!=10)return; //閃爍5次
Flash_Count=0;
Operation_Type=3;
break;
case3: //東西向紅燈，南北向綠燈亮
RED_A=0;YELLOW_A=1;GREEN_A=1;
RED_B=1;YELLOW_B=1;GREEN_B=0;
DelayMS(2000);
Operation_Type=4;
break;
case4: //南北向黃燈閃爍5次
DelayMS(300);
YELLOW_B=~YELLOW_B;GREEN_B=1;
if(++Flash_Count!=10)return;
Flash_Count=0;
Operation_Type=1;
}
}
//主程序
void main()
{
while(1)Traffic_Light();
}
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