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//-----------------------------------------------------------------
// 名称: LED模拟交通灯
//-----------------------------------------------------------------
// 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效果.
//
//-----------------------------------------------------------------
#include <reg51.h>
#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); //??5?
Operation_Type = 2; //??case2
break;
case 2://东西向黄灯开始闪烁,绿灯关闭
delay_ms(1000);
YELLOW_A = ~YELLOW_A; GREEN_A = 1;
if(++Flash_Count != 6) return;
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); //??5?
Operation_Type = 4; //??case2
break;
case 4://南北向黄灯开始闪烁
delay_ms(1000);
YELLOW_B = ~YELLOW_B; GREEN_B = 1;
if(++Flash_Count != 6) return;
Flash_Count = 0;
Operation_Type = 1;
break;
}
}
//-----------------------------------------------------------------
// 主程序
//-----------------------------------------------------------------
void main()
{
while(1)
Traffic_Light();
}
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