arm linux gps.txt

根据GPS的通讯协议实现在ARM-linux下的GPS数据接收程序

 #include   <stdio.h>   
      #include   <conio.h>   
      #include   <process.h>   
      #include   <commplus.h>   
      #include   <infrared.h>   
    
  extern   _stklen   =   4096u;       /*   it   very   useful   to   reduce   memory   in   HT-1800   */   
  extern   _heaplen     =   4096u;     /*         both   stack   &   heap   length   must   be   set         */   
  int   main()   
  {   
    while(1   ==   1)   
    {   
    gps();   
    }   
  return   0;   
  }   
    
  int     gps()   
      {   
          char   *gpsStr;   
          int   charI;   
          int   akey;   
        unsigned   char   cm;   
        unsigned   char   p;   
        unsigned   int     baudtmp,   baud;   
        int                       exitloop   =   0;   
        unsigned   char   ab,   st;   
        unsigned   long   b;   
        unsigned   char   p1;   
        unsigned   char   iroldstat;   
        char   str1[]   =   "$PNMRX103,GGA,1,GSA,0,GSV,0,RMC,0,GLL,0,GSV,0,VTG,0,ZDA,*xx\r\n";   
        int   i;   
        char   tStrArr[254],tlttArr[9],tlgtArr[10];   
        char   *tgga,*tgsa,*trmc,*tltt,*tlgt;   
    
        charI   =   0;   
        if   (!ComPlsInstalled())   
              {   
                if   (InstallComPls(0)   ==   2)   
                      {   
                        cprintf("BIOS   Setting   for   COM1   or   COM2   Error!!!!\r\n\n");   
                        return   0;   
                      }   
              }   
    
        //printf("\nBaudRate:");   
        //scanf("%ld",&b);   
        //scanf("%c",&akey);   
    
        //printf("Port(1/2):");   
        //scanf("%c",&p1);   
        //scanf("%c",&akey);   
    
        //printf("Input   ...");   
    
        IRPowerCtrl(0x01);   
        SetIRMFreq(38000);   
        SetIROutput(2);   
        GetCommMode(&cm,   &p,   &baud);   
    
        if   (b   >=   115200)   
              baudtmp   =   0xFFF0;   
        else   
              baudtmp   =   (int)b;   
    
        if   (p1   ==   2)   
              {   
                if   (b   ==   9600)   
                      {   
                        iroldstat   =   IRPowerCtrl(5);   
                        SetIRMFreq(38000);   
                      }   
                if   (b   ==   19200)   
                      {   
                        iroldstat   =   IRPowerCtrl(5);   
                        SetIRMFreq(307680);   
                      }   
              }   
    
        SetCommMode(3,   2-1,   4800);   
        EnableRx(0);   
        exitloop   =   0;   
        akey   =   0;   
    
        for   (i=0;i<sizeof(str1);i++)   
        PutAuxByte(str1[i]);   
        do   
        {   
    
      if   (kbhit())   
                {   
                  akey   =   getch();   
                  if   (akey   !=   27)   
                        {   
                          if   (!exitloop)   
                                //printf("\n");   
                          exitloop   =   -1;   
                          //PutAuxByte((char)akey);   
                          //printf("%c",akey);   
                        }   
                }   
          if   (ExistAuxBGot(&ab,   &st))   
                {   
                    if   (ab   ==   13)   
                          //printf("\n");   
                          exitloop   =   0;   
                          tStrArr[charI]   =   ab;   
                          charI++;   
                  if(charI   ==   254)   
                  {   
                          gpsStr   =   &tStrArr[0];   
                          tgga   =   strstr(gpsStr,"GPGGA");   
                          //printf("gga:%s",tgga);   
  /*   
                          tlgt   =   getpart(tgga,",",4);   
                          tltt   =   getpart(tgga,",",2);   
                          printf("%s\n",tltt);*/   
                          break;   
                  }   
                }   
        }while   (akey   !=   27);   
          SetCommMode(cm,   p,   baud);   
          iroldstat   =   IRPowerCtrl(0);   
          SetIRMFreq(0);   
          DisableRx();   
          //printf("gga:%s",tgga);   
          tlgt   =   getpart(tgga,",",4);   
          printf("lgt:%s\n",   tlgt);   
          //printf("%s",tgga);   
          tltt   =   getpart(tgga,",",2);   
          printf("ltt:%s\n",   tltt);   
          return   0;   
      }   
    
  int   getpart(char   *SourceStr,char   *ConnStr,int   PartInt)   
          {   
          int   PartI   =   1;   
          char   *ResultStr,*tempStr,*dropStr;   
          int   OriLen,DropLen;   
          //PartInt++;   
          tempStr   =   SourceStr;   
          while(PartI   <=   PartInt)   
          {   
              tempStr   =   strstr(tempStr,ConnStr);   
              tempStr++;   
              PartI++;   
          }   
              OriLen   =   strlen(tempStr);   
              dropStr   =   strstr(tempStr,ConnStr);   
              DropLen   =   strlen(dropStr);   
              strncpy(ResultStr,tempStr,OriLen   -   DropLen);   
              if(dropStr   ==   NULL)//这里防止取到不存在的字符串   
              {   
                  return(NULL);   
              }   
                  else   
              {   
                  return(ResultStr);   
              }   
  }