LCD12864(St7920/St7921)+超声波测距模块+STC89C52

/******************************************************************************/
/*  晶振：11.0592M                                                            */
/*  接线：模块TRIG接 P1.2  ECH0 接P1.1                                          */
/*      RS(CS)    接  P3.3;                                                       */
/*      RW(SID)   接  P3.4;                                                      */
/*      E(SCLK)   接  P3.5;                                                      */
/*      PSB       接  GND 串行模式                                              */
/******************************************************************************/
    #include  
    #include       
//引脚定义
    sbit     RX    =  P1 ^ 1;
    sbit     TX    =  P1 ^ 2;
    sbit     CS    =  P3 ^ 3;    //片选 高电平有效 单片LCD使用时可固定高电平
    sbit     SID   =  P3 ^ 4;    //数据
    sbit     SCLK  =  P3 ^ 5;    //时钟

//Function Definition　函数声明 
void Delay(int num);
void Init_DS18B20(void);
unsigned char ReadOneChar(void);
void WriteOneChar(unsigned char dat);
unsigned int ReadTemperature(void);
void clock_out(unsigned char dd);
unsigned char clock_in(void);
unsigned char read_clock(unsigned char ord);
void write_clock(unsigned char ord, unsigned char dd);
void Disp(void);
void id_case1_key(void);
void id_case2_key(void);
void Set_time(unsigned char sel,bit sel_1);
void Timer0_Init(void);
void Init_1302(void);
void Set_Bell(unsigned char sel, bit sel_1);
void Bell(void);
//12864
void Write_char(bit start, unsigned char ddata);
void Send_byte(unsigned char bbyte);
void Delaynms(unsigned int di);
void Lcd_init(void);
void Disp_img(unsigned char *img);
void LCD_Write_string(unsigned char X,unsigned char Y,unsigned char *s);
void LCD_set_xy( unsigned char x, unsigned char y );
unsigned char code num[]={"0123456789 :.-"};
unsigned char code waves[]={"超声波测距系统"};
unsigned char code znwk[] ={"智能微控工作室"};
unsigned char code CM[] =  {"M"};
unsigned int  time=0;
         long S=0;
         bit  flag =0;
unsigned char disbuff[4]       ={ 0,0,0,0,};
unsigned char code logo[]={  
/*--  调入了一幅图像：logo.bmp  -- */ 
/*--  宽度x高度=128x64 欢迎使用本产品LOGO --*/
/*--  调入了一幅图像：C:\Documents and Settings\lwd\桌面\新建文件夹\X.bmp  --*/
/*--  宽度x高度=128x64  --*/
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};

/******************************************************************************/
void Lcd_init(void)    //初始化LCD 
{
    Delaynms(10); //启动等待，等LCM讲入工作状态
      CS=1;
      Write_char(0,0x30);  //8 位介面，基本指令集
      Write_char(0,0x0c);  //显示打开，光标关，反白关
      Write_char(0,0x01);  //清屏，将DDRAM的地址计数器归零  
}

/******************************************************************************/
void Write_char(bit start, unsigned char ddata) //写指令或数据
{
    unsigned char start_data,Hdata,Ldata;
      if(start==0) 
        start_data=0xf8;     //写指令
    else    
        start_data=0xfa;  //写数据
  
      Hdata=ddata&0xf0;          //取高四位
      Ldata=(ddata<<4)&0xf0;  //取低四位
      Send_byte(start_data);      //发送起始信号
      Delaynms(5); //延时是必须的
      Send_byte(Hdata);          //发送高四位
      Delaynms(1);  //延时是必须的
      Send_byte(Ldata);          //发送低四位
      Delaynms(1);  //延时是必须的
}

/******************************************************************************/
void Send_byte(unsigned char bbyte) //发送一个字节
{
    unsigned char i;
     for(i=0;i<8;i++)
       {
           SID=bbyte&0x80; //取出最高位
         SCLK=1;
           SCLK=0;
           bbyte<<=1; //左移
       }  
}

/******************************************************************************/
void Delaynms(unsigned int di) //延时
{
    unsigned int da,db;
     for(da=0;da            for(db=0;db<10;db++);
}

/******************************************************************************/
void Disp_img(unsigned char  *img)    //图形方式12864显示字模221 横向取膜
{ 
    unsigned char i,j;
    unsigned int k = 0;

    Write_char(0,0x36); //图形方式
    for(i=0;i<32;i++)
      { 
        Write_char(0,0x80+i);
        Write_char(0,0x80);
        for(j=0;j<16;j++) 
        {
            Write_char(1,img[k++]);
        }
      }

     for(i=0;i<32;i++)
      { 
        Write_char(0,0x80+i);
        Write_char(0,0x88);
        for(j=0;j<16;j++) 
        {
            Write_char(1,img[k++]);
          }
    }
}
    
/******************************************************************************/
void Clr_Scr(void)//清屏函数
{
    Write_char(0,0x01);
}

/******************************************************************************/
void LCD_set_xy( unsigned char x, unsigned char y )
{    //设置LCD显示的起始位置，X为行，Y为列
    unsigned char address;
    switch(x)
    {
        case 0: address = 0x80 + y; break;    
        case 1: address = 0x80 + y; break; 
        case 2: address = 0x90 + y; break; 
            case 3: address = 0x88 + y; break;
        case 4: address = 0x98 + y; break; 
        default:address = 0x80 + y; break;
    }
    Write_char(0, address);
}

/******************************************************************************/
void LCD_Write_string(unsigned char X,unsigned char Y,unsigned char *s)
{    //    中英文字符串显示函数
    LCD_set_xy( X, Y );
    
    while (*s) 
    {
        Write_char( 1, *s );
        s ++;
        Delaynms(1);
    }
}

/******************************************************************************/
void LCD_Write_number(unsigned char s)//    数字显示函数
{    
    Write_char(1,num[s]);
    Delaynms(1);
}
/******************************************************************************/
void Lcd_Mark2(void)
{
    Clr_Scr();//清屏
    LCD_Write_string(1,0,znwk);//
    LCD_Write_string(2,0,waves);//    
    LCD_Write_string(3,7,CM);//    
}

/********************************************************/
    void Conut(void)
    {
       time=TH0*256+TL0;
       TH0=0;
       TL0=0;
       S=time*1.87/100;       //算出来是CM      11。0592M晶振
       if(flag==1)              //超出测量
      {     
       flag=0;
       LCD_set_xy( 3, 4 );
       LCD_Write_number(13);
       LCD_Write_number(12);
       LCD_set_xy( 3, 5 );
       LCD_Write_number(13);
       LCD_Write_number(13);
      
       }
     else
      {
       disbuff[1]=S%1000/100;
       disbuff[2]=S%1000%100/10;
       disbuff[3]=S%1000%10 %10;
       LCD_set_xy( 3, 4 );
       LCD_Write_number(disbuff[1]);
       LCD_Write_number(12);
       LCD_set_xy( 3, 5 );
       LCD_Write_number(disbuff[2]);
       LCD_Write_number(disbuff[3]);
      }
    }
/********************************************************/ 
void delayms(unsigned int ms)
{
    unsigned char i=100,j;
    for(;ms;ms--)
    {
        while(--i)
        {
            j=10;
            while(--j);
        }
    }
}
/********************************************************/
     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
  }
/********************************************************/
   void  StartModule()                  //T1中断用来扫描数码管和计800MS启动模块
  {
      TX=1;                             //800MS  启动一次模块
      _nop_(); 
      _nop_(); 
      _nop_(); 
      _nop_(); 
      _nop_(); 
      _nop_(); 
      _nop_(); 
      _nop_(); 
      _nop_(); 
      _nop_(); 
      _nop_(); 
      _nop_(); 
      _nop_(); 
      _nop_(); 
      _nop_(); 
      _nop_(); 
      _nop_();
      _nop_(); 
      _nop_(); 
      _nop_(); 
      _nop_();
      TX=0;
  }
/********************************************************/
void main(void)
{  
    TMOD=0x01;           //设T0为方式1，GATE=1
    TH0=0;
    TL0=0; 
    TR0=1; 

    Lcd_init();       //设置液晶显示器
    Clr_Scr();        //清屏    
    Disp_img(logo);      //显示欢迎使用本产品LOGO
    Delaynms(1000);
    Lcd_init();       //从图形显示状态下返回
    Lcd_Mark2();

    while(1)
    {
     StartModule();     
                         //计算
     while(!RX);        //当RX为零时等待
     TR0=1;                //开启计数
     while(RX);            //当RX为1计数并等待
     TR0=0;                //关闭计数
     Conut();
     delayms(80);        //80MS

    }

}