基于单片机STC89C52RC的交通灯摘要：本交通灯系统采用STC89C52RC作为核心控制器，控制红绿黄三盏灯，来达到模拟日常交通灯系统，其中倒计时时间通过1602显示出来关键词：交通灯 1602液晶一、 设计方案整个模拟交通灯系统用单片机STC89C52RC作为核心控制器，有序的控制着红黄绿三盏灯的运行，实际交通灯系统所需的倒计时时间采用1602显示出来，并且其倒计时时间可通过独立式键盘进行调整STC89C52红黄绿LED1602液晶独立式键盘 系统框图二、 主程序流程图开始系统初始化 等待中断 N 按键是否按下？ Y 调用按键处理函数 返回三、 附录------源程序(C)一、the main function of this system /**用stc52实现简易交通灯*/#include#include#include "define.h"#include "lcd_1602.h"#include "delay.h"#include "some_inits.h"#include "control.h"/****************************************主函数void main()****************************************/void main(){ sys_init(); while(1) { key_scan(); //扫描键盘 delay_ms(100); }}二、include Some .h files(1)defines.h#ifndef _define_h#define _define_h#define uchar unsigned char#define unint unsigned int/* 液晶数据区 */sfr lcd_bus=0x80; //液晶数据口sbit E=P2^7;sbit RW=P2^6;sbit RS=P2^5;/* 定义三盏led */sbit red=P2^0;sbit green=P2^1;sbit yellow=P2^2;/* 定义三个开关 */sbit jia=P1^0; //加一键 sbit jian=P1^1; //减一键sbit ok=P1^2; //确认键uchar flag=1; //1,2,3：绿灯，黄灯，红灯bit first=0;/* 蜂鸣器 */sbit bell=P1^4;uchar sec_h; //秒针十位uchar sec_l; //秒针个位uchar g_h=1,g_l=0;//绿灯计时数据uchar y_h=1,y_l=0;//黄灯计时数据uchar r_h=1,r_l=0;//红灯计时数据#endif(2)some_inits.h#ifndef _some_inits_h#define _some_inits_h#include "lcd_1602.h"#include "define.h"//state some functionsvoid L1602_init();void Time0_init();/*系统初始化*/void sys_init(){ flag=1; //绿灯 green=1; red=0; yellow=0; L1602_init();//1602液晶初始化 Time0_init();//定时器0初始化 }/*1602初始化*/void L1602_init(void){ enable(0x01); enable(0x38); enable(0x0c); enable(0x06); enable(0xd0); L1602_string(1,2,"traffic lights"); sec_h=g_h; sec_l=g_l; L1602_char(2,8,sec_h+0x30); L1602_char(2,9,sec_l+0x30);}/* 定时器0初始化 */void Time0_init(){ TMOD=0x01; //time0,time1工作在方式一 IE=0x8a; //开EA，允许ET0,允许ET1 TH0=0x4c; //50ms,晶振是11.0592M TL0=0x00; //TH1=0xfc; //1ms //TL1=0x66; TR0=1; //time0开始计数}#endif (3)control.h#ifndef _control_h_#define _control_h_#include #include "lcd_1602.h"#include "define.h"#include "delay.h" /* state some functions */void inc();void dec();void fmq();/* 键盘扫描函数 */void key_scan(){ if(ok==0) { delay_ms(5); if(ok==0) { fmq(); enable(0x0c); //关光标 first=0; TR0=1; //开始计数 } else _nop_(); } else if(jia==0 || jian==0) { delay_ms(5); if(jia==0 || jian==0) { TR0=0; // 停止计数 fmq(); while(!first) { first=1; enable(0x0f); //开光标,开反白 } if(jia==0) inc(); else if(jian==0) dec(); } else { _nop_(); } }}/* 加一 */void inc(void){ _nop_(); if(green==1 && yellow==0 && red==0) { if(g_l<9 && g_h<5) g_l++; else { if(g_h<5) { g_h++; g_l=0; } else { g_h=5; g_l=0; } } sec_h=g_h;sec_l=g_l; } else if(yellow==1 && red==0 && green==0) { if(y_l<9 && y_h<5) y_l++; else { if(y_h<5) { y_h++; y_l=0; } else { y_h=5; y_l=0; } } sec_h=y_h;sec_l=y_l; } else if(red==1 && green==0 && yellow==0 ) { if(r_l<9 && r_h<5) r_l++; else { if(r_h<5) { r_h++; r_l=0; } else { r_h=5; r_l=0; } } sec_h=r_h;sec_l=r_l; } L1602_char(2,9,sec_l+0x30); L1602_char(2,8,sec_h+0x30);}/* 减一 */void dec(void){ _nop_(); if(green==1 && yellow==0 && red==0) { if(g_l>0 && g_h>0) { g_l--; } else { if(g_h>0) { g_h--; g_l=9; } else if(g_l>0) { g_l--; } else { g_h=0; g_l=0; } } sec_h=g_h;sec_l=g_l; } else if(yellow==1 && green==0 && red==0) { if(y_l>0 && y_h>0) { y_l--; } else { if(y_h>0) { y_h--; y_l=9; } else if(y_l>0) { y_l--; } else { y_h=0; y_l=0; } } sec_h=y_h;sec_l=y_l; } else if(red==1 && yellow==0 && green==0) { if(r_l>0 && r_h>0) { r_l--; } else { if(r_h>0) { r_h--; r_l=9; } else if(r_l>0) { r_l--; } else { r_h=0; r_l=0; } } sec_h=r_h;sec_l=r_l; }L1602_char(2,9,sec_l+0x30);L1602_char(2,8,sec_h+0x30);}/* 蜂鸣器鸣响一声 */void fmq(){ unint i=150; while(i--) { bell=~bell; delay_ms(1); } }/* time0 service function */void time0() interrupt 1{ static count=0; TR0=0; if(count==20) //1s { count=0; if(sec_l==0) { if(sec_h==0) //30s结束 { if(flag==1) { flag++; green=1; red=0; yellow=0; sec_h=g_h; sec_l=g_l; } else if(flag==2) //状态二，亮黄灯 { flag++; green=0; red=0; yellow=1; sec_h=y_h; sec_l=y_l; } else if(flag==3)//状态三，红灯亮 { flag=1; //回到状态一，绿灯亮 green=0; red=1; yellow=0; sec_h=r_h; sec_l=r_l; } } else //个位为0而已 { sec_h--; sec_l=9; } } else { sec_l--; } L1602_char(2,8,sec_h+0x30); L1602_char(2,9,sec_l+0x30); } else { count++; } TH0=0x4c; TL0=0x00; TR0=1;}#endif (4)lcd_1602.h#ifndef _lcd_1602_h#define _lcd_1602_h#include "define.h"#include "delay.h"uchar Convert(uchar In_Date){ uchar i, Out_Date = 0, temp = 0; for(i=0; i<8; i++) { temp = (In_Date >> i) & 0x01; Out_Date |= (temp << (7 - i)); } return Out_Date;}/*写命令*/void enable(uchar del){ P0 = Convert(del); RS = 0; RW = 0; E = 0; delay(); E = 1; delay();}/*写数据*/void write(uchar del){ P0 = Convert(del); RS = 1; RW = 0; E = 0; delay(); E = 1; delay();}/*写字符*/void L1602_char(uchar hang,uchar lie,char sign){ uchar a; if(hang == 1) a = 0x80; if(hang == 2) a = 0xc0; a = a + lie - 1; enable(a); write(sign);}/*写字符串*/void L1602_string(uchar hang,uchar lie,uchar *p){ uchar a; if(hang == 1) a = 0x80; if(hang == 2) a = 0xc0; a = a + lie - 1; enable(a); while(1) { if(*p == '\0') break; write(*p); p++; }}#endif。
