用单片机AT89C51的T0中断模拟控制十字路口的交通信号指示灯（红、绿、蓝）。
单片机源程序如下:
- #include<reg51.h>
- #define uchar unsigned char
- #define uint unsigned int
- //定义控制端口
- 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;
- //定义全局变量
- uchar Time_Count =0; //延时倍数
- uchar Flash_Count =0; //闪烁次数
- uchar Operation_Type =1; //操作类型变量
- //T0中断子程序
- void T0_INT () interrupt 1
- { TH0 = -50000/256;
- TL0 = -50000%256;
- switch (Operation_Type)
- { case 1: //东西向绿灯与南北向红灯亮5s
- RED_A = 0; YELLOW_A = 0; GREEN_A = 1;
- RED_B = 1; YELLOW_B = 0; GREEN_B = 0;
- //5s后切换操作(50ms*100=5s)
- if(++ Time_Count != 100) return;
- Time_Count = 0;
- Operation_Type = 2; //进入操作类型2
- break;
- case 2: //东西向黄灯开始闪烁，绿灯灭
- if (++ Time_Count != 8) return;
- Time_Count = 0;
- YELLOW_A = ! YELLOW_A;
- GREEN_A = 0;
- //闪烁5次
- if (++ Flash_Count != 10) return;
- Flash_Count = 0;
- Operation_Type = 3; //进入操作类型3
- break ;
- case 3: //东西向红灯与南北向绿灯亮5s
- RED_A = 1; YELLOW_A = 0; GREEN_A = 0;
- RED_B = 0; YELLOW_B = 0; GREEN_B = 1;
- //南北向绿灯亮5s后切换
- if(++ Time_Count != 100) return;
- Time_Count = 0;
- Operation_Type = 4; //进入操作类型4
- break;
- case 4: //南北向黄灯开始闪烁，绿灯灭
- if (++ Time_Count != 8) return;
- Time_Count =0;
- YELLOW_B = ! YELLOW_B;
- GREEN_B = 0;
- //闪烁5次
- if (++ Flash_Count != 10) return;
- Flash_Count = 0;
- Operation_Type = 1; //回到操作类型1
- break ;
- }
- }
- //主程序
- void main ()
- { TMOD = 0x01; //T0工作在方式1
- TH0 = -50000/256; //赋初值，计数50000次
- TL0 = -50000%256;
- EA=1 ; //允许总中断
- ET0=1; //允许T0中断
- TR0 = 1 ; //启动T0
- while(1) ;
- }
所有资料51hei提供下载:
基于51单片机的红绿灯.7z
(32.8 KB, 下载次数: 94)
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