说明： 东西向绿灯亮若干秒后，黄灯闪烁，闪烁5次后亮红灯， 红灯亮后，南北向由红灯变为绿灯，若干秒后南北向黄灯闪烁， 闪烁5次后亮红灯，东西向绿灯亮，如此往复. 本例将时间设得较短是为了调试的时候能较快的观察到运行结果.
代码块：
#include#define INT8U unsigned char #define INT16U unsigned int sbit RED_A = P0^0; //东西向指示灯 sbit YELLOW_A =P0^1; sbit GREEN_A = P0^2; sbit RED_B = P0^3; //南北向指示灯 sbit YELLOW_B = P0^4; sbit GREEN_B = P0^5; //闪烁次数及操作类型变量定义 INT8U Flash_Count = 0, Operation_Type = 1; //----------------------------------------- //延时函数 //----------------------------------------- void delay_ms(INT16U x) { INT8U t; while(x--) for(t=0; t<120; t++); } //----------------------------------------- //交通灯切换子程序 //----------------------------------------- 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; delay_ms(5000); Operation_Type=2; break; case 2: //东西向黄灯开始闪烁，绿灯关闭 for(; Flash_Count<6; Flash_Count++) { RED_A=1; YELLOW_A=~YELLOW_A; GREEN_A=1; delay_ms(300); } Flash_Count=0; Operation_Type=3; break; case 3: //东西向红灯与南北向绿灯亮 RED_A=0; YELLOW_A=1; GREEN_A=1; RED_B=1; YELLOW_B=1; GREEN_B=0; delay_ms(5000); Operation_Type=4; break; case 4: //南北向黄灯开始闪烁 for(; Flash_Count<6; Flash_Count++) { RED_B=1; YELLOW_B=~YELLOW_B; GREEN_B=1; delay_ms(300); } Operation_Type=1; break; } } //------------------------------------------ //主程序 //------------------------------------------ void main() { while(1){ Traffic_Light(); } }
