#include<reg51.h> #define uchar unsigned char #define uint unsigned int sbit RED_A=P0^0; //东西向灯 sbit YELLOW_A=P0^1; sbit GREEN_A=P0^2; sbit RED_B=P0^3; //南北向灯 sbit YELLOW_B=P0^4; sbit GREEN_B=P0^5; uchar Flash_Count=0,Operation_Type=1; //闪烁次数，操作类型变量 //延时 void DelayMS(uint x) { uchar i; while(x--) for(i=0;i<120;i++); } //交通灯切换 void Traffic_Light() { switch(Operation_Type) { case 1: //东西向绿灯与南北向红灯亮 RED_A=1;YELLOW_A=1;GREEN_A=0; RED_B=0;YELLOW_B=1;GREEN_B=1; DelayMS(2000); Operation_Type=2; break; case 2: //东西向黄灯闪烁，绿灯关闭 DelayMS(300); YELLOW_A=~YELLOW_A;GREEN_A=1; if(++Flash_Count!=10) return; //闪烁 5 次 Flash_Count=0; Operation_Type=3; break; case 3: //东西向红灯，南北向绿灯亮 RED_A=0;YELLOW_A=1;GREEN_A=1; RED_B=1;YELLOW_B=1;GREEN_B=0; DelayMS(2000); Operation_Type=4; break; case 4: //南北向黄灯闪烁 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(); }