51单片机解码GPS 1602显示

时间:2022-06-01 18:59:14

用51单片机解析串口GPS模块发来的信息,在1602液晶显示 ,用51单片机的TXD口接GPS模块的RXD口。程序略做修改并修正了一些错误。
这是电路原理图。程序是结合我单片机的板子做了修改。 
就是先焊接一个51单片机最小系统。我的程序中是用的P0口与1602液晶通信。
 

  
 这是做的改进,由原来的串口GPS模块,换成了蓝牙GPS模块。最右边是诺基亚的蓝牙GPS模块,小的四方的板子上蓝牙串口主模块,用来接收蓝牙GPS发出的信号。程序还是原程序。 
 
 
程序是结合网络资料,自己加已修改。
因无法上传附件,只有把代码贴 这了。
 
 
 

//这是1602液晶的驱动头文件,文件名为1602.h
 
 /*
LCD1602驱动,兼容LCD2402
*/
sbit LCD_DB0= P0^0;
sbit LCD_DB1= P0^1;
sbit LCD_DB2= P0^2;
sbit LCD_DB3= P0^3;
sbit LCD_DB4= P0^4;
sbit LCD_DB5= P0^5;
sbit LCD_DB6= P0^6;
sbit LCD_DB7= P0^7;
sbit LCD1602_RS=P1^0;
sbit LCD1602_RW=P1^1; 
sbit LCD1602_EN=P1^2;
void LCD_write_char( unsigned x,unsigned char y,unsigned char dat); //在指定位置显示字符
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s);//在指定位置显示字符串
void LCD_cls(void);//清屏
void LCD_en_command(unsigned char command);
void LCD_en_dat(unsigned char temp);
void LCD_set_xy( unsigned char x, unsigned char y );
void LCD_init(unsigned char bw);
void SET_LCD(unsigned char IO_temp);
void delayms(unsigned char ms);
void lcddelay(void);
unsigned char LCDIO; 
unsigned char BitWidth;
void LCD_cls(void)
{
 LCD_en_command(0x01); //0x01 清屏
    delayms(2);
}
void LCD_en_command(unsigned char command)
{
 LCD1602_RS=0;   
 LCD1602_RW=0;
 LCD1602_EN=0;
 switch(BitWidth){
   case 4:
  LCDIO=(command & 0xf0);   //取高4位
  break;
   case 8:
  LCDIO=command;
     break;
 }
 SET_LCD(LCDIO);
 LCD1602_EN=1;
 lcddelay();
 LCD1602_EN=0;
 if (BitWidth==4){
  LCDIO=(command & 0x0f)<<4;  //取低4位
  SET_LCD(LCDIO);
  LCD1602_EN=1;
  lcddelay();
  LCD1602_EN=0;
 }
}
void SET_LCD(unsigned char IO_temp)
{   
 //高4位
 LCD_DB7=IO_temp&0x80;
 LCD_DB6=IO_temp&0x40;
 LCD_DB5=IO_temp&0x20;
 LCD_DB4=IO_temp&0x10;
 //低4位
 if (BitWidth==8){
  LCD_DB3=IO_temp&0x08;
  LCD_DB2=IO_temp&0x04;
  LCD_DB1=IO_temp&0x02;
  LCD_DB0=IO_temp&0x01;
 }
}
void LCD_en_dat(unsigned char dat)
{
 LCD1602_RS=1;
 LCD1602_RW=0;
 LCD1602_EN=0;
 switch(BitWidth){
   case 4:
  LCDIO=(dat & 0xf0);   //取高4位
  break;
   case 8:
  LCDIO=dat;
  break;
 }
 SET_LCD(LCDIO);
 LCD1602_EN=1;
 lcddelay();
 LCD1602_EN=0;
  
 if (BitWidth==4){
  LCDIO=(dat & 0x0f)<<4;  //取低4位
  SET_LCD(LCDIO);
  LCD1602_EN=1;
  lcddelay();
  LCD1602_EN=0;
 }
}
/*=======================================================
*1602
* 输入参数:x、y : 显示字符串的坐标,X:0-15,Y:0-1
*LCD第一行显示寄存器地址:0X80-0X8F
*LCD第二行显示寄存器地址:0XC0-0XCF  
*2404
*LCD第1行显示地址:1~20(0x80~0x93) 
*LCD第2行显示地址:1~20(0xc0~0xd3) 
*LCD第3行显示地址:1~20(0x94~0xa7) 
*LCD第4行显示地址:1~20(0xd4~0xe7) 
=======================================================*/ 
void LCD_set_xy( unsigned char x, unsigned char y )
{
 unsigned char address;
 if (y ==0) 
    address = 0x80 + x;
 else
   if(y==1) 
  address = 0xC0 + x;
   else
     if(y==2)
    address = 0x94 + x;
  else
    if(y==3)
      address = 0xD4 + x;
 LCD_en_command(address); 
}
void LCD_write_char( unsigned x,unsigned char y,unsigned char dat)
{
 LCD_set_xy( x, y ); 
 LCD_en_dat(dat);
}
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s)
{
    LCD_set_xy( X, Y );    //set address 
    while (*s)       // write character
    {
  LCDIO=*s;
  SET_LCD(LCDIO);
  LCD_en_dat(*s);   
  s ++;
    }
}
void LCD_init(unsigned char bw)
{
 BitWidth=bw;
 switch(BitWidth){
   case 4:
  LCD_en_command(0x33); //
  delayms(20);
  LCD_en_command(0x32); //
  delayms(20);
  break;
      case 8:
  LCD_en_command(0x38); //
  delayms(20);
  LCD_en_command(0x38); //
  delayms(20);
  break;
 }
 LCD_en_command(0x08); //0x08 令显示器off 
 delayms(5);
 LCD_en_command(0x01); //0x01 清屏   清屏指令
 delayms(5);
 LCD_en_command(0x06); //0x06 光标模式设置 进入模式设置指令 写入数据后光标右移
 delayms(5);
 LCD_en_command(0x0c); //0x0c 显示开      令光标,0x0c=不显示,0x0d=显示闪动
 delayms(5);
}
void delayms(unsigned char ms) 
{
 unsigned char i;
 while(ms--)
 {
  for(i = 0; i < 115; i++);
 }
}
void lcddelay(void) 
{
 unsigned char i;
 for(i = 0; i < 2; i++);
}

 
 
 
 
 
 
//这是解码主程序 

 


 
 
 
 

 
/*************************************
 GPS解码显示程序,
***************************************/
#include<reg52.h>
#include "1602.h"
//#include"math.h"
//#include <stdlib.h>
sbit GPS_SPD=P2^1;    //接收波特率设置
sbit KEY1=P2^0;   //显示内容分屏切换,(T0,T1引脚 的第二功能为计数器。)
char code TIME_AREA= 8;  //时区
/***************************************
       这是做的部分更改
************************************/
unsigned long maxspeed,b;
unsigned int count=0;
unsigned int a[5];
unsigned char hspeed[5];
unsigned int dot_count; //小数点计数器
//unsigned char x;
//GPS数据存储数组
unsigned char JD[10];  //经度
unsigned char JD_a;  //经度方向
unsigned char WD[9];  //纬度
unsigned char WD_a;  //纬度方向
unsigned char date[6];  //日期
unsigned char time[6];  //时间
unsigned char speed[5]={'0','0','0','.','0'};  //速度
unsigned char high[6];  //高度
unsigned char angle[5]={'0','0','0','0','0'};  //方位角
unsigned char use_sat[2]; //使用的卫星数
unsigned char total_sat[2]; //天空中总卫星数
unsigned char lock;   //定位状态
//串口中断需要的变量
unsigned char seg_count; //逗号计数器
unsigned char byte_count; //位数计数器
unsigned char cmd_number; //命令类型
unsigned char mode;   //0:结束模式,1:命令模式,2:数据模式
unsigned char buf_full;  //1:整句接收完成,相应数据有效。0:缓存数据无效。
unsigned char cmd[5];  //命令类型存储数组
//显示需要的变量
unsigned int dsp_count;  //刷新次数计数器
//unsigned char time_count;
bit page;
void sys_init(void);
bit chk_key(void);
main()
{
 unsigned char i;
 char Bhour;
 sys_init();
 lock=1;
 use_sat[0]='0';
 use_sat[1]='0';
 total_sat[0]='0';
 total_sat[1]='0';
 while(1){
     if(buf_full==0)    //无GPS信号时
  {
   dsp_count++;
   if(dsp_count>=65000){
    LCD_cls();   //清屏
    LCD_write_string(0,0,"No GPS connect..");
    LCD_write_string(0,1,"Please Check..");
    while(buf_full==0);
    LCD_cls(); 
    dsp_count=0;
   }
  }
  else{      //有GPS信号时
/*************************************
 最大速度处理
*************************************/
                     dot_count=0;
       b=0;
                      for(i=0;i<5;i++)
       {
           if(speed!='.')
           dot_count++;
        else
           break ;
       }
       switch(dot_count)
       {
          
       case 1:
            b=((speed[0]-'0')*10+(speed[2]-'0'))*1.852;
         break;
       case 2:
            b=((speed[0]-'0')*100+(speed[1]-'0')*10+(speed[4]-'0'))*1.852;
         break;
       case 3:
            b=((speed[0]-'0')*1000+(speed[1]-'0')*100+(speed[2]-'0')*10+(speed[4]-'0'))*1.852;
         break;
      
        }
                      if(b>maxspeed)
       {
         maxspeed=b;
          }

/*************************************
 最大速度处理
*************************************/
 
            
   if(chk_key()){    //检测到按键切换显示
    page=!page;
    LCD_cls();
   }
   if(!page){      //页面1

                      
    if(buf_full|0x01){    //GGA语句
     if(lock==0){     //如果未定位
      LCD_write_string(0,0,"*---.--.----  ");
      LCD_write_string(0,1,"* --.--.----  ");     
     }else{       //如果已定位
 
         LCD_write_char(0,0,JD_a);   //显示经度
         for(i=0;i<3;i++)
      {
        LCD_write_char(i+1,0,JD);
        }
                        LCD_write_char(4,0,'.');
                        for(i=3;i<10;i++)
      {
        LCD_write_char(i+2,0,JD);
        }
      LCD_write_char(0,1,WD_a);   //显示纬度
      LCD_write_char(1,1,' ');
         for(i=0;i<2;i++)
      {
       LCD_write_char(i+2,1,WD);
      }
      LCD_write_char(4,1,'.');
                        for(i=2;i<9;i++)
      {
       LCD_write_char(i+3,1,WD);
      }
            
      }
     LCD_write_char(14,1,use_sat[0]);  //显示接收卫星数
     LCD_write_char(15,1,use_sat[1]);
     buf_full&=~0x01;
     dsp_count=0;
   }
    if(buf_full|0x02){    //GSV语句
     LCD_write_char(14,1,total_sat[0]);
     LCD_write_char(15,1,total_sat[1]);
     buf_full&=~0x02;
     dsp_count=0;
    }
    if(buf_full|0x04){
     if(lock==0){     //如果未定位
      LCD_write_string(0,0,"*---.--.----  ");
      LCD_write_string(0,1,"* --.--.----  ");     
     }else{       //如果已定位
 
           LCD_write_char(0,0,JD_a);   //显示经度
        for(i=0;i<3;i++)
     {
       LCD_write_char(i+1,0,JD);
       }
                    LCD_write_char(4,0,'.');
                    for(i=3;i<10;i++)
     {
       LCD_write_char(i+2,0,JD);
       }
     LCD_write_char(0,1,WD_a);   //显示纬度
    
     LCD_write_char(1,1,' ');
                 for(i=0;i<2;i++)
     {
      LCD_write_char(i+2,1,WD);
     }
     LCD_write_char(4,1,'.');
                    for(i=2;i<9;i++)
     {
      LCD_write_char(i+3,1,WD);
     }
         }
     LCD_write_char(14,0,use_sat[0]);  //显示接收卫星数
     LCD_write_char(15,0,use_sat[1]);
     buf_full&=~0x04;
     dsp_count=0;
    }
   }
   else{       //页面2
    if(buf_full|0x01){    //GGA语句
     buf_full&=~0x01;
     dsp_count=0;
    }
    if(buf_full|0x02){
     buf_full&=~0x02;
     dsp_count=0;
    }
    if(buf_full|0x04){    //RMC语句
     Bhour=((time[0]-0x30)*10+time[1]-0x30)+TIME_AREA;
     if(Bhour>=24){
      Bhour-=24;
     }else if(Bhour<0){
      Bhour+=24;
     }
     LCD_write_char(0,1,date[4]);
     LCD_write_char(1,1,date[5]);
     LCD_write_char(2,1,date[2]);
     LCD_write_char(3,1,date[3]);
     LCD_write_char(4,1,date[0]);
     LCD_write_char(5,1,date[1]);
     LCD_write_char(8,1,Bhour/10+0x30);
     LCD_write_char(9,1,Bhour%10+0x30);
     LCD_write_char(10,1,':');
     LCD_write_char(11,1,time[2]);
     LCD_write_char(12,1,time[3]);
     LCD_write_char(13,1,':');
     LCD_write_char(14,1,time[4]);
     LCD_write_char(15,1,time[5]);
     LCD_write_string(5,0,"knot A");         
     if(lock=='0'){     //如果未定位
      LCD_write_string(0,0,"---.-");
      LCD_write_string(11,0,"---.-");
     }else{                                                      //已经定位,在此处做的改动。
/*******************************************************************************/

        
       
                           if(count<10)
         { 
                            
                            for(i=0;i<5;i++)
       {   
       LCD_write_char(i,0,speed);//knot显示
       }
       count++;
        }
        else
        {
          if(count>15)
          {  
          count=0;
       }
                           hspeed[0]=maxspeed/1000+0x30;                     //把小数转成字符数组
         hspeed[1]=(maxspeed/100)%10+0x30; 
         hspeed[2]=(maxspeed/10)%10+0x30;
         hspeed[3]='.';
         hspeed[4]= maxspeed%10+0x30;
           
          count++;
       LCD_write_string(5,0,"Km/h A"); 
                            LCD_write_char(0,0,hspeed[0]);
       LCD_write_char(1,0,hspeed[1]); 
       LCD_write_char(2,0,hspeed[2]);
       LCD_write_char(3,0,hspeed[3]);
       LCD_write_char(4,0,hspeed[4]); //最大速度显  */
      }
                         
/*******************************************************************************/
        for(i=0;i<5;i++){
        LCD_write_char(11+i,0,angle);
      }
     }
     buf_full&=~0x04;
     dsp_count=0;
    }
   }
  }
 }
}
bit chk_key(void)
{
 if(!KEY1){
  delayms(10);
  if(!KEY1){
   while(!KEY1);
   delayms(10);
   return(1);
  }
 }
    LCD_cls();   //清屏
 return(0);
}
//系统初始化
void sys_init() {
 unsigned char i;
 SCON = 0x50;  /* SCON: mode 1, 8-bit UART, enable rcvr */
 TMOD = 0x21;  /* TMOD: timer 1, mode 2, 8-bit reload */
 if(GPS_SPD){
  TH1 = 0xfa;   /* TH1: reload value for 9600 baud @ 11.059MHz */
 }else{
  TH1 = 0xfd;   /* TH1: reload value for 4800 baud @ 11.059MHz */
 }
 TR1 = 1;   /* TR1: timer 1 run */
 LCD_init(8);  //初始化LCD
 LCD_write_string(0,0," GPS SIRF II 2 ");
 LCD_write_string(0,1," 11-11-23 1342 ");
 
 
 for(i=1;i<4;i++){
  delayms(250);
 }
 //LCD_cls();
 IE=0x90;   //开总中断、串口中断
}
//串口接收中断
void uart(void) interrupt 4
{
 unsigned char tmp;
 if(RI){
  tmp=SBUF;
  switch(tmp){
   case '$':
    cmd_number=0;  //命令类型清空
    mode=1;    //接收命令模式
    byte_count=0;  //接收位数清空
    break;
   case ',':
    seg_count++;  //逗号计数加1
    byte_count=0;
    break;
   case '*':
    switch(cmd_number){
     case 1:
      buf_full|=0x01;
      break;
     case 2:
      buf_full|=0x02;
      break;
     case 3:
      buf_full|=0x04;
      break;
    }
    mode=0;
    break;
   default:
    if(mode==1){
     //命令种类判断
     cmd[byte_count]=tmp;   //接收字符放入类型缓存
     if(byte_count>=4){    //如果类型数据接收完毕,判断类型
      if(cmd[0]=='G'){
       if(cmd[1]=='P'){
        if(cmd[2]=='G'){
         if(cmd[3]=='G'){
          if(cmd[4]=='A'){
           cmd_number=1;
           mode=2;
           seg_count=0;
           byte_count=0;
          }
         }
         else if(cmd[3]=='S'){
          if(cmd[4]=='V'){
           cmd_number=2;
           mode=2;
           seg_count=0;
           byte_count=0;
          }
         }
        }
        else if(cmd[2]=='R'){
         if(cmd[3]=='M'){
          if(cmd[4]=='C'){
           cmd_number=3;
           mode=2;
           seg_count=0;
           byte_count=0;
          }
         }
        }
       }
      }
     }
    }
    else if(mode==2){
     //接收数据处理
     switch (cmd_number){
      case 1:    //类型1数据接收。GPGGA
       switch(seg_count){
        case 2:  //纬度处理
         if(byte_count<9){
          WD[byte_count]=tmp;
         }
         break;
        case 3:  //纬度方向处理
         if(byte_count<1){
          WD_a=tmp;
         }
         break;
        case 4:  //经度处理
         if(byte_count<10){
          JD[byte_count]=tmp;
         }
         break;
        case 5:  //经度方向处理
         if(byte_count<1){
          JD_a=tmp;
         }
         break;
        case 6:  //定位判断
         if(byte_count<1){
          lock=tmp;
         }
         break;
        case 7:  //定位使用的卫星数
         if(byte_count<2){
          use_sat[byte_count]=tmp;
         }
         break;
        case 9:  //高度处理
         if(byte_count<6){
          high[byte_count]=tmp;
         }
         break;
       }
       break;
      case 2:    //类型2数据接收。GPGSV
       switch(seg_count){
        case 3:  //天空中的卫星总数
         if(byte_count<2){
          total_sat[byte_count]=tmp;
         }
         break;
       }
       break;
      case 3:    //类型3数据接收。GPRMC
       switch(seg_count){
        case 1:  //时间处理
         if(byte_count<6){    
          time[byte_count]=tmp; 
         }
         break;
        case 2:  //定位判断      
         if(byte_count<1){
           if (tmp=='A') {lock=1;}
           else{
             lock=0;}
         }
         break;
        case 3:  //纬度处理      
         if(byte_count<9){
          WD[byte_count]=tmp;
         }
         break;
        case 4:  //纬度方向处理      
         if(byte_count<1){
          WD_a=tmp;
         }
         break;
        case 5:  //经度处理      
         if(byte_count<10){
          JD[byte_count]=tmp;
         }
         break;
        case 6:  //经度方向处理      
         if(byte_count<1){
          JD_a=tmp;
         }
         break;
        case 7:  //速度处理      
         if(byte_count<5){
          speed[byte_count]=tmp;
         }
                               
         break;
        case 8:  //方位角处理      
         if(byte_count<5){
          angle[byte_count]=tmp;
         }
         break;
        case 9:  //方位角处理      
         if(byte_count<6){
          date[byte_count]=tmp;
         }
         break;
       }
       break;
     }
    }
    byte_count++;  //接收数位加1
    break;
  }
 }
 RI=0;
}