单片机控制交通灯V1.0

单片机控制交通灯V1.0

要求：

（1）、十字路口南北、东西方向各装有绿、黄、红指示灯，南北通行时间为15s，东西通行时间为10s，当由绿灯变为红灯前的3s内，绿灯灭而黄灯亮。

（2）、通行时间各由两位7段LED显示器指示，且为倒时间指示（即从15或10逐次减一，禁止通行时显示器灭）。

（3）、当某方向显示红灯时，容许人工干预强行改变两个方向的指示灯颜色，以让救护车之类的车辆通行，但发出改变通行命令后有3s时间使显示绿灯的方向改变显示黄灯，并以每秒10次的频率闪烁，以示警告。

 

小结：本实验用ISIS 7 Professional、Keil uVision2仿真，由于是学单片机以来做的第一个实验，在南北、东西两个方向四个数码管倒计时那里控制得不好，用动态描扫实现，闪烁比较明显，希望在后面的理论学习中找到更好的实现方法。

 

 

 

参考源程序：

#include"reg52.h"   #define uchar unsigned char #define uint unsigned int     sbit one=P3^4;      //数码段位选控制 sbit two=P3^5; sbit three=P3^6; sbit four=P3^7;   sbit d_lu=P0^1; sbit d_huang=P0^2; sbit d_hong=P0^3;   sbit x_lu=P2^1; sbit x_huang=P2^2; sbit x_hong=P2^3;   sbit n_lu=P2^4; sbit n_huang=P2^5; sbit n_hong=P2^6;   sbit b_lu=P0^4; sbit b_huang=P0^5; sbit b_hong=P0^6;   uint fangxiang=0; uint m,n,k;   code unsigned char tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0XD8,0x80,0x90};//7段LED对应于数字'0','1'...'9' void delay(uint z) {     uint x,y;     for(x=z;x>0;x--)         for(y=110;y>0;y--); }       void delayMs(uint timer_num, uint fxang) {     uchar aa,bb,j;     TMOD=0x10;                  //设定T1为方式1     TR1=1;                      //启动定时器工作      fangxiang=fxang;                               for(j=0;j<10;j++)           //每隔100ms中断一次，中断10次为1s     {         TH1=0x3c;                   //定初值                           TL1=0xb0;         if(fxang==0)            //东西方向通行         {            do                        {                 aa=timer_num/10;                 bb=timer_num%10;                 one=1;          //数码管动态扫描，位选                      two=0;                 three=0;                 four=0;                 P1=tab[aa];     //数码管动态扫描，段选                 delay(50);                        one=0;                      two=1;                 three=0;                 four=0;                 P1=tab[bb];                 delay(50);             }while(!TF1);                                   TF1=0;           }          else             if(fxang==1)        //南北方向通行             {                            do                            {                     aa=timer_num/10;                     bb=timer_num%10;                     one=0;                          two=0;                          three=1;                          four=0;                     P1=tab[aa];                     delay(50);                            one=0;                          two=0;                          three=0;                          four=1;                     P1=tab[bb];                     delay(50);                  }while(!TF1);                 TF1=0;              }     } }   void zhuangtai_1()  {   d_lu=0;   d_hong=1;   d_huang=1;     x_lu=0;   x_hong=1;   x_huang=1;     n_hong=0;   n_huang=1;   n_lu=1;     b_hong=0;   b_lu=1;   b_huang=1;     }                                    void zhuangtai_2()       {   d_lu=1;   d_huang=0;   d_hong=1;     x_lu=1;   x_huang=0;   x_hong=1;     n_hong=0;   n_huang=1;   n_lu=1;     b_hong=0;   b_huang=1;   b_lu=1; } void zhuangtai_3()  {   d_lu=1;   d_huang=1;   d_hong=0;     x_lu=1;   x_huang=1;   x_hong=0;     n_hong=1;   n_huang=1;   n_lu=0;     b_hong=1;   b_huang=1;   b_lu=0;   } void zhuangtai_4()   {     d_lu=1;     d_huang=1;     d_hong=0;       x_lu=1;     x_huang=1;     x_hong=0;       n_hong=1;     n_huang=0;     n_lu=1;       b_hong=1;     b_huang=0;     b_lu=1; }   void exint0(void) interrupt 0   //人工干预，外部中断0实现 {     EA=0;         one=0;                      //关闭所有数码管     two=0;     three=0;     four=0;     TMOD=0x10;                  //设定T1为方式1     TR1=1;                      //启动定时器工作                                         for(m=0;m<30;m++)           //改变通行命令后3s     {         TH1=0x3c;                   //定初值                           TL1=0xb0;          do              {             delay(50);             delay(50);         }while(!TF1);         TF1=0;     }         if(fangxiang==0)            //fangxiang为产生外部中断时通行的方向,0为东西方向     {         n_hong=0;         b_hong=0;         d_lu=1;         x_lu=1;         for(n=0;n<10;n++)       //使黄灯每秒闪10次              {             TR1=1;              //启动定时器工作              TH1=0x3c;               //定初值                               TL1=0xb0;                  do                        {                 delay(100);             }while(!TF1);             TF1=0;                                    d_huang=0;             x_huang=0;             delay(1000);             d_huang=1;             x_huang=1;              }     }     else                        //产生中断时，通行方向为南北方向     {         d_hong=0;         x_hong=0;         n_lu=1;         b_lu=1;         for(k=0;k<10;k++)//每秒10次              {             TR1=1;              /* 启动定时器工作 */             TH1=0x3c;           //定初值                               TL1=0xb0;                  do                        {                 delay(100);             }while(!TF1);             TF1=0;                                                                    n_huang=0;             b_huang=0;             delay(1000);             n_huang=1;             b_huang=1;              }     }       EA=1; }        main() {     int i;     TCON=0x55;     IE=0x81;     while(1)     {             for(i=10;i>=4;i--)      //东西通行10s                  {                 zhuangtai_1();                 delayMs(i,0);             }             for(i=3;i>=0;i--)                           {                 zhuangtai_2();                 delayMs(i,0);                                          }                                    for(i=15;i>=4;i--)      //南北通行15s                           {                            zhuangtai_3();                 delayMs(i,1);                        }                                 for(i=3;i>=0;i--)             {                 zhuangtai_4();                            delayMs(i,1);                                                   }                                  }  }