超声波倒车雷达

短命女 2024-04-18 22:49 0阅读 0赞

同学的毕业设计！我帮忙做的，所以..（一下省略N个字！）

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用到器件：51单片机，超声波传感器、蜂鸣器、led、1602显示模块。。

硬件比较简单了，怎么用，自己去查资料吧。。

我就发下源码：

#include <reg52.h>		
    #include <intrins.h>
    #define LCM_Data  P0
    #define Busy    0x80 //用于检测LCM状态字中的Busy标识
    sbit LCM_RW = P3^4 ;//定义LCD引脚
    sbit LCM_RS = P3^3;
    sbit LCM_E  = P3^5;
    sbit  FM = P2^3;//蜂鸣器
    sbit  RX = P3^0;
    sbit  TX = P3^1;
    
    void LCMInit(void);//LCD初始化函数
    void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);//LCD显示一个字符函数
    void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData);//LCD显示一个字符串函数
    void Delay5Ms(void);//延时5毫秒函数
    void Delay400Ms(void);//延时400毫秒函数
    void Decode(unsigned char ScanCode);
    void WriteDataLCM(unsigned char WDLCM);//LCD1602写数据函数
    void WriteCommandLCM(unsigned char WCLCM,BuysC);//LCD写命令函数
    
    //unsigned char ReadDataLCM(void);
    unsigned char ReadStatusLCM(void);
    unsigned char code Range[] ="==Range Finder==";//LCD1602显示格式
    unsigned char code ASCII[13] = "0123456789.-M";
    unsigned char code table[]="Distance:000.0cm";
    unsigned char code table1[]="!!! Out of range";
    
    //static unsigned char DisNum = 0; //显示用指针				  
    unsigned int  time=0;
    unsigned long S=0;
    bit  flag =0;
    unsigned char disbuff[4]={ 0,0,0,0,};
    
    //写数据
    void WriteDataLCM(unsigned char WDLCM) 
    {
    	ReadStatusLCM(); //检测忙
    	LCM_Data = WDLCM;
    	LCM_RS = 1;
    	LCM_RW = 0;
    	LCM_E = 0; //若晶振速度太高可以在这后加小的延时
    	LCM_E = 0; //延时
    	LCM_E = 1;
    }
    
    //写指令
    void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC为0时忽略忙检测
    {
    	if (BuysC) ReadStatusLCM(); //根据需要检测忙
    	LCM_Data = WCLCM;
    	LCM_RS = 0;
    	LCM_RW = 0;	
    	LCM_E = 0;
    	LCM_E = 0;
    	LCM_E = 1;	
    }
    
    //读数据
    /*unsigned char ReadDataLCM(void)
    {
    	LCM_RS = 1; 
    	LCM_RW = 1;
    	LCM_E = 0;
    	LCM_E = 0;
    	LCM_E = 1;
    	return(LCM_Data);
    }*/
    
    //读状态
    unsigned char ReadStatusLCM(void)
    {
    	LCM_Data = 0xFF; 
    	LCM_RS = 0;
    	LCM_RW = 1;
    	LCM_E = 0;
    	LCM_E = 0;
    	LCM_E = 1;
    	while (LCM_Data & Busy); //检测忙信号
    	return(LCM_Data);
    }
    
    void LCMInit(void) //LCM初始化
    {
    	LCM_Data = 0;
    	WriteCommandLCM(0x38,0); //三次显示模式设置，不检测忙信号
    	Delay5Ms(); 
    	WriteCommandLCM(0x38,0);
    	Delay5Ms(); 
    	WriteCommandLCM(0x38,0);
    	Delay5Ms(); 
    
    	WriteCommandLCM(0x38,1); //显示模式设置,开始要求每次检测忙信号
    	WriteCommandLCM(0x08,1); //关闭显示
    	WriteCommandLCM(0x01,1); //显示清屏
    	WriteCommandLCM(0x06,1); // 显示光标移动设置
    	WriteCommandLCM(0x0c,1); // 显示开及光标设置
    }
    
    //按指定位置显示一个字符
    void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
    {
    	Y &= 0x1;
    	X &= 0xF; //限制X不能大于15，Y不能大于1
    	if (Y) X |= 0x40; //当要显示第二行时地址码+0x40;
    	X |= 0x80; //算出指令码
    	WriteCommandLCM(X, 1); //发命令字
    	WriteDataLCM(DData); //发数据
    }
    
    //按指定位置显示一串字符
    void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData)
    {
    	unsigned char ListLength;
    
      ListLength = 0;
    	Y &= 0x1;
    	X &= 0xF; //限制X不能大于15，Y不能大于1
    	while (DData[ListLength]>0x19) //若到达字串尾则退出
    		{
    			if (X <= 0xF) //X坐标应小于0xF
    				{
    					DisplayOneChar(X, Y, DData[ListLength]); //显示单个字符
    					ListLength++;
    					X++;
    				}
    		}
    }
    
    //5ms延时
    void Delay5Ms(void)
    {
    	unsigned int TempCyc = 5552;
    	while(TempCyc--);
    }
    
    //400ms延时
    void Delay400Ms(void)
    {
    	unsigned char TempCycA = 5;
    	unsigned int TempCycB;
    	while(TempCycA--)
    		{
    			TempCycB=7269;
    			while(TempCycB--);
    		};
    }
    /********************************************************/
        void Conut(void)
    	{
    	 time=TH0*256+TL0;
    	 TH0=0;
    	 TL0=0;
    	
    	 S=(time*1.7)/10+10;     //算出来是MM
    	 if((S>=7000)||flag==1) //超出测量范围
    	 {	 
    	  flag=0;
          DisplayListChar(0, 1, table1);
    	 }
    	 else
    	 {
    	  if(S>500) FM=1;
    	  else FM=0;
          disbuff[0]=S%10;
    	  disbuff[1]=S/10%10;
    	  disbuff[2]=S/100%10;
    	  disbuff[3]=S/1000;
    	  DisplayListChar(0, 1, table);
    	  DisplayOneChar(9, 1, ASCII[disbuff[3]]);
    	  DisplayOneChar(10, 1, ASCII[disbuff[2]]);	
    	  DisplayOneChar(11, 1, ASCII[disbuff[1]]);
          DisplayOneChar(12, 1, ASCII[10]);
    	  DisplayOneChar(13, 1, ASCII[disbuff[0]]);
    	 }
    	}
    /********************************************************/
         void zd0() interrupt 1 		 //T0中断用来计数器溢出,超过测距范围
      {
        flag=1;			 //中断溢出标志
    	RX=0;
      }
    /********************************************************/
         void  StartModule() 		         //启动模块
      {
    	  TX=1;			                     //启动一次模块
    	  _nop_(); 
    	  TX=0;
      }
    /********************************************************/ 
    /*void delayms(unsigned int ms)
    {
    	unsigned char i=100,j;
    	for(;ms;ms--)
    	{
    		while(--i)
    		{
    			j=10;
    			while(--j);
    		}
    	}
    }*/
    void Timer_Count(void)
    {
    	TR0=1;		//开启计数
    	while(RX);	//当RX为1计数并等待
    	TR0=0;		//关闭计数
             Conut();		//计算
    
    }
    /*********************************************************/
    void main(void)
    {
        unsigned int valA;
    	Delay400Ms(); //启动等待，等LCM讲入工作状态
    	LCMInit(); //LCM初始化
    	Delay5Ms(); //延时片刻
    	DisplayListChar(0, 0, Range);
    	DisplayListChar(0, 1, table);
    	//ReadDataLCM();//测试用句无意义
        TMOD=0x01;//设T0为方式1，GATE=1；
        EA=1;
        TH0=0;
        TL0=0;          
        ET0=1;             //允许T0中断
    				   //开启总中断			
     	while(1)
    	  {
    		RX=1;
    	    StartModule();
            for(valA=7510;valA>0;valA--)
    	    {
    		   
    	       if(RX==1)
    		   {
               Timer_Count();
    		   }
        	 }
    	  }
    }