示例#1
0
static void
nmea_reader_parse( NmeaReader*  r )
{
   /* we received a complete sentence, now parse it to generate
    * a new GPS fix...
    */
    NmeaTokenizer  tzer[1];
    Token          tok;

    D("Received: '%.*s'", r->pos, r->in);
    if (r->pos < 9) {
        D("Too short. discarded.");
        return;
    }

    nmea_tokenizer_init(tzer, r->in, r->in + r->pos);
#if GPS_DEBUG
    {
        int  n;
        D("Found %d tokens", tzer->count);
        for (n = 0; n < tzer->count; n++) {
            Token  tok = nmea_tokenizer_get(tzer,n);
            D("%2d: '%.*s'", n, tok.end-tok.p, tok.p);
        }
    }
#endif

    tok = nmea_tokenizer_get(tzer, 0);
    if (tok.p + 5 > tok.end) {
        D("sentence id '%.*s' too short, ignored.", tok.end-tok.p, tok.p);
        return;
    }

    // ignore first two characters.
    tok.p += 2;
    if ( !memcmp(tok.p, "GGA", 3) ) {
        // GPS fix
        Token  tok_time          = nmea_tokenizer_get(tzer,1);
        Token  tok_latitude      = nmea_tokenizer_get(tzer,2);
        Token  tok_latitudeHemi  = nmea_tokenizer_get(tzer,3);
        Token  tok_longitude     = nmea_tokenizer_get(tzer,4);
        Token  tok_longitudeHemi = nmea_tokenizer_get(tzer,5);
        Token  tok_altitude      = nmea_tokenizer_get(tzer,9);
        Token  tok_altitudeUnits = nmea_tokenizer_get(tzer,10);

        nmea_reader_update_time(r, tok_time);
        nmea_reader_update_latlong(r, tok_latitude,
                                      tok_latitudeHemi.p[0],
                                      tok_longitude,
                                      tok_longitudeHemi.p[0]);
        nmea_reader_update_altitude(r, tok_altitude, tok_altitudeUnits);

    } else if ( !memcmp(tok.p, "GSA", 3) ) {
        // do something ?
    } else if ( !memcmp(tok.p, "RMC", 3) ) {
        Token  tok_time          = nmea_tokenizer_get(tzer,1);
        Token  tok_fixStatus     = nmea_tokenizer_get(tzer,2);
        Token  tok_latitude      = nmea_tokenizer_get(tzer,3);
        Token  tok_latitudeHemi  = nmea_tokenizer_get(tzer,4);
        Token  tok_longitude     = nmea_tokenizer_get(tzer,5);
        Token  tok_longitudeHemi = nmea_tokenizer_get(tzer,6);
        Token  tok_speed         = nmea_tokenizer_get(tzer,7);
        Token  tok_bearing       = nmea_tokenizer_get(tzer,8);
        Token  tok_date          = nmea_tokenizer_get(tzer,9);

        D("in RMC, fixStatus=%c", tok_fixStatus.p[0]);
        if (tok_fixStatus.p[0] == 'A')
        {
            nmea_reader_update_date( r, tok_date, tok_time );

            nmea_reader_update_latlong( r, tok_latitude,
                                           tok_latitudeHemi.p[0],
                                           tok_longitude,
                                           tok_longitudeHemi.p[0] );

            nmea_reader_update_bearing( r, tok_bearing );
            nmea_reader_update_speed  ( r, tok_speed );
        }
    } else {
        tok.p -= 2;
        D("unknown sentence '%.*s", tok.end-tok.p, tok.p);
    }
    if (r->fix.flags != 0) {
#if GPS_DEBUG
        char   temp[256];
        char*  p   = temp;
        char*  end = p + sizeof(temp);
        struct tm   utc;

        p += snprintf( p, end-p, "sending fix" );
        if (r->fix.flags & GPS_LOCATION_HAS_LAT_LONG) {
            p += snprintf(p, end-p, " lat=%g lon=%g", r->fix.latitude, r->fix.longitude);
        }
        if (r->fix.flags & GPS_LOCATION_HAS_ALTITUDE) {
            p += snprintf(p, end-p, " altitude=%g", r->fix.altitude);
        }
        if (r->fix.flags & GPS_LOCATION_HAS_SPEED) {
            p += snprintf(p, end-p, " speed=%g", r->fix.speed);
        }
        if (r->fix.flags & GPS_LOCATION_HAS_BEARING) {
            p += snprintf(p, end-p, " bearing=%g", r->fix.bearing);
        }
        if (r->fix.flags & GPS_LOCATION_HAS_ACCURACY) {
            p += snprintf(p,end-p, " accuracy=%g", r->fix.accuracy);
        }
        gmtime_r( (time_t*) &r->fix.timestamp, &utc );
        p += snprintf(p, end-p, " time=%s", asctime( &utc ) );
        //D(temp);
#endif
        if (r->callback) {
            r->callback( &r->fix );
            r->fix.flags = 0;
        }
        else {
            D("no callback, keeping data until needed !");
        }
    }
}
static void
nmea_reader_parse( NmeaReader*  r )
{
    /* we received a complete sentence, now parse it to generate
     * a new GPS fix...
     */
    NmeaTokenizer  tzer[1];
    Token          tok;
    struct timeval tv;

    D("Received: '%.*s'", r->pos, r->in);
    if (r->pos < 9) {
        D("Too short. discarded.");
        return;
    }

    gettimeofday(&tv, NULL);
    if (_gps_state->init)
        _gps_state->callbacks->nmea_cb(tv.tv_sec*1000+tv.tv_usec/1000, r->in, r->pos);

    nmea_tokenizer_init(tzer, r->in, r->in + r->pos);
#if GPS_DEBUG
    {
        int  n;
        D("Found %d tokens", tzer->count);
        for (n = 0; n < tzer->count; n++) {
            Token  tok = nmea_tokenizer_get(tzer,n);
            D("%2d: '%.*s'", n, tok.end-tok.p, tok.p);
        }
    }
#endif

    tok = nmea_tokenizer_get(tzer, 0);
    if (tok.p + 5 > tok.end) {
        D("sentence id '%.*s' too short, ignored.", tok.end-tok.p, tok.p);
        return;
    }
    /*
    $GPRMC,084537.345,V,,,,,,,270811,,,N*4F
    $GPGGA,084538.353,,,,,0,00,,,M,0.0,M,,0000*51
    $GPGSA,A,1,,,,,,,,,,,,,,,*1E
    $GPGSV,3,1,11,09,80,303,,12,41,229,,15,40,178,,17,39,070,*70
    $GPGSV,3,2,11,22,20,295,,18,18,256,,14,13,317,,26,10,154,*72
    $GPGSV,3,3,11,25,08,234,,28,08,056,,24,04,011,*40
    */
    // ignore first two characters.
    tok.p += 2;
    if ( !memcmp(tok.p, "GGA", 3) ) {
        // GPS fix
        Token  tok_time          = nmea_tokenizer_get(tzer,1);
        Token  tok_latitude      = nmea_tokenizer_get(tzer,2);
        Token  tok_latitudeHemi  = nmea_tokenizer_get(tzer,3);
        Token  tok_longitude     = nmea_tokenizer_get(tzer,4);
        Token  tok_longitudeHemi = nmea_tokenizer_get(tzer,5);
        Token  tok_altitude      = nmea_tokenizer_get(tzer,9);
        Token  tok_altitudeUnits = nmea_tokenizer_get(tzer,10);

        nmea_reader_update_time(r, tok_time);
        nmea_reader_update_latlong(r, tok_latitude,
                                   tok_latitudeHemi.p[0],
                                   tok_longitude,
                                   tok_longitudeHemi.p[0]);
        nmea_reader_update_altitude(r, tok_altitude, tok_altitudeUnits);

    } else if ( !memcmp(tok.p, "GSA", 3) ) {
        //Satellites are handled by RPC-side code.
        /*
        1    = Mode:
               M=Manual, forced to operate in 2D or 3D
               A=Automatic, 3D/2D
        2    = Mode:
               1=Fix not available
               2=2D
               3=3D
        3-14 = IDs of SVs used in position fix (null for unused fields)
        15   = PDOP
        16   = HDOP
        17   = VDOP
        */
        Token tok_mode = nmea_tokenizer_get(tzer,1);
        Token tok_fix  = nmea_tokenizer_get(tzer,2);
        Token tok_id  = nmea_tokenizer_get(tzer,3);
        Token tok_pdop = nmea_tokenizer_get(tzer,15);
        Token tok_hdop = nmea_tokenizer_get(tzer,16);
        Token tok_vdop = nmea_tokenizer_get(tzer,17);
        int i;
        for ( i=0; i<12; i++ ) {
            Token tok_id  = nmea_tokenizer_get(tzer,3+i);
            if ( tok_id.end > tok_id.p )
                id_in_fixed[i]=str2int(tok_id.end, tok_id.p);
        }
    } else if ( !memcmp(tok.p, "GSV", 3) ) {
        //Satellites are handled by RPC-side code.
        Token tok_num_messages   = nmea_tokenizer_get(tzer,1);
        Token tok_msg_number     = nmea_tokenizer_get(tzer,2);
        Token tok_svs_inview     = nmea_tokenizer_get(tzer,3);
        Token tok_sv1_prn_num    = nmea_tokenizer_get(tzer,4);
        Token tok_sv1_elevation  = nmea_tokenizer_get(tzer,5);
        Token tok_sv1_azimuth    = nmea_tokenizer_get(tzer,6);
        Token tok_sv1_snr        = nmea_tokenizer_get(tzer,7);
        Token tok_sv2_prn_num    = nmea_tokenizer_get(tzer,8);
        Token tok_sv2_elevation  = nmea_tokenizer_get(tzer,9);
        Token tok_sv2_azimuth    = nmea_tokenizer_get(tzer,10);
        Token tok_sv2_snr        = nmea_tokenizer_get(tzer,11);
        Token tok_sv3_prn_num    = nmea_tokenizer_get(tzer,12);
        Token tok_sv3_elevation  = nmea_tokenizer_get(tzer,13);
        Token tok_sv3_azimuth    = nmea_tokenizer_get(tzer,14);
        Token tok_sv3_snr        = nmea_tokenizer_get(tzer,15);
        Token tok_sv4_prn_num    = nmea_tokenizer_get(tzer,16);
        Token tok_sv4_elevation  = nmea_tokenizer_get(tzer,17);
        Token tok_sv4_azimuth    = nmea_tokenizer_get(tzer,18);
        Token tok_sv4_snr        = nmea_tokenizer_get(tzer,19);
        int num_messages = str2int(tok_num_messages.p,tok_num_messages.end);
        int msg_number = str2int(tok_msg_number.p,tok_msg_number.end);
        int svs_inview = str2int(tok_svs_inview.p,tok_svs_inview.end);
        D("GSV %d %d %d", num_messages, msg_number, svs_inview );
        if (msg_number==1)
            r->sv_status.used_in_fix_mask=0;
        nmea_reader_update_svs( r, svs_inview, msg_number, 0, tok_sv1_prn_num, tok_sv1_elevation, tok_sv1_azimuth, tok_sv1_snr );
        nmea_reader_update_svs( r, svs_inview, msg_number, 1, tok_sv2_prn_num, tok_sv2_elevation, tok_sv2_azimuth, tok_sv2_snr );
        nmea_reader_update_svs( r, svs_inview, msg_number, 2, tok_sv3_prn_num, tok_sv3_elevation, tok_sv3_azimuth, tok_sv3_snr );
        nmea_reader_update_svs( r, svs_inview, msg_number, 3, tok_sv4_prn_num, tok_sv4_elevation, tok_sv4_azimuth, tok_sv4_snr );
        r->sv_status.num_svs=svs_inview;

        if (num_messages==msg_number)
            update_gps_svstatus(&r->sv_status);
        /*
        1    = Total number of messages of this type in this cycle
        2    = Message number
        3    = Total number of SVs in view
        4    = SV PRN number
        5    = Elevation in degrees, 90 maximum
        6    = Azimuth, degrees from true north, 000 to 359
        7    = SNR, 00-99 dB (null when not tracking)
        8-11 = Information about second SV, same as field 4-7
        12-15= Information about third SV, same as field 4-7
        16-19= Information about fourth SV, same as field 4-7
        */
        /*
                  int i;
                  _gps_state.sv_status.num_svs=ntohl(data[82]) & 0x1F;
                  for(i=0;i<ret.num_svs;++i) {
                      _gps_state.sv_status.sv_list[i].prn=ntohl(data[83+3*i]);
                      _gps_state.sv_status.sv_list[i].elevation=ntohl(data[83+3*i+1]);
                      _gps_state.sv_status.sv_list[i].azimuth=ntohl(data[83+3*i+2])/100;
                      _gps_state.sv_status.sv_list[i].snr=ntohl(data[83+3*i+2])%100;
                  }
                  _gps_state.sv_status.used_in_fix_mask=ntohl(data[77]);
                  update_gps_svstatus(&_gps_state.

        */
    } else if ( !memcmp(tok.p, "RMC", 3) ) {
        Token  tok_time          = nmea_tokenizer_get(tzer,1);
        Token  tok_fixStatus     = nmea_tokenizer_get(tzer,2);
        Token  tok_latitude      = nmea_tokenizer_get(tzer,3);
        Token  tok_latitudeHemi  = nmea_tokenizer_get(tzer,4);
        Token  tok_longitude     = nmea_tokenizer_get(tzer,5);
        Token  tok_longitudeHemi = nmea_tokenizer_get(tzer,6);
        Token  tok_speed         = nmea_tokenizer_get(tzer,7);
        Token  tok_bearing       = nmea_tokenizer_get(tzer,8);
        Token  tok_date          = nmea_tokenizer_get(tzer,9);

        D("in RMC, fixStatus=%c", tok_fixStatus.p[0]);
        if (tok_fixStatus.p[0] == 'A')
        {
            nmea_reader_update_date( r, tok_date, tok_time );

            nmea_reader_update_latlong( r, tok_latitude,
                                        tok_latitudeHemi.p[0],
                                        tok_longitude,
                                        tok_longitudeHemi.p[0] );

            nmea_reader_update_bearing( r, tok_bearing );
            nmea_reader_update_speed  ( r, tok_speed );
        }
    } else {
        tok.p -= 2;
        D("unknown sentence '%.*s", tok.end-tok.p, tok.p);
    }
    if (r->fix.flags != 0) {
#if GPS_DEBUG
        char   temp[256];
        char*  p   = temp;
        char*  end = p + sizeof(temp);
        struct tm   utc;

        p += snprintf( p, end-p, "sending fix" );
        if (r->fix.flags & GPS_LOCATION_HAS_LAT_LONG) {
            p += snprintf(p, end-p, " lat=%g lon=%g", r->fix.latitude, r->fix.longitude);
        }
        if (r->fix.flags & GPS_LOCATION_HAS_ALTITUDE) {
            p += snprintf(p, end-p, " altitude=%g", r->fix.altitude);
        }
        if (r->fix.flags & GPS_LOCATION_HAS_SPEED) {
            p += snprintf(p, end-p, " speed=%g", r->fix.speed);
        }
        if (r->fix.flags & GPS_LOCATION_HAS_BEARING) {
            p += snprintf(p, end-p, " bearing=%g", r->fix.bearing);
        }
        if (r->fix.flags & GPS_LOCATION_HAS_ACCURACY) {
            p += snprintf(p,end-p, " accuracy=%g", r->fix.accuracy);
        }
        gmtime_r( (time_t*) &r->fix.timestamp, &utc );
        p += snprintf(p, end-p, " time=%s", asctime( &utc ) );
#endif
        if (_gps_state->callbacks->location_cb) {
            _gps_state->callbacks->location_cb( &r->fix );
            r->fix.flags = 0;
        } else {
            D("no callback, keeping data until needed !");
        }

        /*
                if (r->callback) {
                    r->callback( &r->fix );
                    r->fix.flags = 0;
                }
                else {
                    D("no callback, keeping data until needed !");
                }
        */
    }
}
示例#3
0
static void
nmea_reader_parse( NmeaReader*  r )
{
   /* we received a complete sentence, now parse it to generate
    * a new GPS fix...
    */
    NmeaTokenizer  tzer[1];
    Token          tok;

    D("Received: '%.*s'", r->pos, r->in);
    if (r->pos < 9) {
        D("Too short. discarded.");
        return;
    }

    nmea_tokenizer_init(tzer, r->in, r->in + r->pos);
#if GPS_DEBUG
    {
        int  n;
        D("Found %d tokens", tzer->count);
        for (n = 0; n < tzer->count; n++) {
            Token  tok = nmea_tokenizer_get(tzer,n);
            D("%2d: '%.*s'", n, tok.end-tok.p, tok.p);
        }
    }
#endif

    tok = nmea_tokenizer_get(tzer, 0);
    if (tok.p + 5 > tok.end) {
        D("sentence id '%.*s' too short, ignored.", tok.end-tok.p, tok.p);
        return;
    }

    // ignore first two characters.
    tok.p += 2;
    if ( !memcmp(tok.p, "GGA", 3) ) {
        // GPS fix
        Token  tok_time          = nmea_tokenizer_get(tzer,1);
        Token  tok_latitude      = nmea_tokenizer_get(tzer,2);
        Token  tok_latitudeHemi  = nmea_tokenizer_get(tzer,3);
        Token  tok_longitude     = nmea_tokenizer_get(tzer,4);
        Token  tok_longitudeHemi = nmea_tokenizer_get(tzer,5);
        Token  tok_altitude      = nmea_tokenizer_get(tzer,9);
        Token  tok_altitudeUnits = nmea_tokenizer_get(tzer,10);

        nmea_reader_update_time(r, tok_time);
        nmea_reader_update_latlong(r, tok_latitude,
                                      tok_latitudeHemi.p[0],
                                      tok_longitude,
                                      tok_longitudeHemi.p[0]);
        nmea_reader_update_altitude(r, tok_altitude, tok_altitudeUnits);

    } else if ( !memcmp(tok.p, "GSA", 3) ) {
        int i;
				Token  tok_fixStatus   = nmea_tokenizer_get(tzer, 2); 
				
				if (tok_fixStatus.p[0] != '\0' && tok_fixStatus.p[0] != '1') { 
				  Token  tok_accuracy      = nmea_tokenizer_get(tzer, 15); 
				  nmea_reader_update_accuracy(r, tok_accuracy); 
				} 
				
        for(i = 3; i <= 14; i++){
            Token tok_prn = nmea_tokenizer_get(tzer, i);
            if(tok_prn.p >= tok_prn.end){
                r->status.used_in_fix_mask &= ~(1 << (i-3));
            }else{
                r->status.used_in_fix_mask |= 1 << (i-3);
            }
        }
    } else if ( !memcmp(tok.p, "GSV", 3) ) {
        Token  tok_numgsv          = nmea_tokenizer_get(tzer,1);
        Token  tok_indexgsv          = nmea_tokenizer_get(tzer,2);
        Token  tok_numsvs          = nmea_tokenizer_get(tzer,3);
        int numgsv = str2int(tok_numgsv.p, tok_numgsv.end);
        int indexgsv = str2int(tok_indexgsv.p, tok_indexgsv.end);
        int numsvs = str2int(tok_numsvs.p, tok_numsvs.end);

	if((indexgsv <= numgsv) && (indexgsv >= 1)) //________
        if (numsvs > 0){
            int i, j = 4;
            for(i = (indexgsv-1) << 2; i < indexgsv << 2; i++){
                Token  tok_prn          = nmea_tokenizer_get(tzer,j++);
                Token  tok_elevation          = nmea_tokenizer_get(tzer,j++);
                Token  tok_azimuth          = nmea_tokenizer_get(tzer,j++);
                Token  tok_snr          = nmea_tokenizer_get(tzer,j++);
                nmea_reader_update_sv_list(&r->status.sv_list[i], tok_prn, tok_elevation, tok_azimuth, tok_snr);
            }
            if(indexgsv == numgsv){
                r->status.num_svs = numsvs;
                if(r->sv_status_cb)
                    r->sv_status_cb(&r->status);
            }
        }
    } else if ( !memcmp(tok.p, "RMC", 3) ) {
        Token  tok_time          = nmea_tokenizer_get(tzer,1);
        Token  tok_fixStatus     = nmea_tokenizer_get(tzer,2);
        Token  tok_latitude      = nmea_tokenizer_get(tzer,3);
        Token  tok_latitudeHemi  = nmea_tokenizer_get(tzer,4);
        Token  tok_longitude     = nmea_tokenizer_get(tzer,5);
        Token  tok_longitudeHemi = nmea_tokenizer_get(tzer,6);
        Token  tok_speed         = nmea_tokenizer_get(tzer,7);
        Token  tok_bearing       = nmea_tokenizer_get(tzer,8);
        Token  tok_date          = nmea_tokenizer_get(tzer,9);

        D("in RMC, fixStatus=%c", tok_fixStatus.p[0]);
        if (tok_fixStatus.p[0] == 'A')
        {
            nmea_reader_update_date( r, tok_date, tok_time );

            nmea_reader_update_latlong( r, tok_latitude,
                                           tok_latitudeHemi.p[0],
                                           tok_longitude,
                                           tok_longitudeHemi.p[0] );

            nmea_reader_update_bearing( r, tok_bearing );
            nmea_reader_update_speed  ( r, tok_speed );
        }
    } else {
        tok.p -= 2;
        D("unknown sentence '%.*s", tok.end-tok.p, tok.p);
    }
    if ((r->fix.flags & GPS_LOCATION_HAS_LAT_LONG) &&
           (r->fix.flags & GPS_LOCATION_HAS_ALTITUDE) &&
           (r->fix.flags & (GPS_LOCATION_HAS_SPEED | GPS_LOCATION_HAS_BEARING))) {

#if GPS_DEBUG
        char   temp[256];
        char*  p   = temp;
        char*  end = p + sizeof(temp);
        struct tm   utc;

        p += snprintf( p, end-p, "sending fix" );
        if (r->fix.flags & GPS_LOCATION_HAS_LAT_LONG) {
            p += snprintf(p, end-p, " time=%llu", r->fix.timestamp);
            p += snprintf(p, end-p, " lat=%g lon=%g", r->fix.latitude, r->fix.longitude);
        }
        if (r->fix.flags & GPS_LOCATION_HAS_ALTITUDE) {
            p += snprintf(p, end-p, " altitude=%g", r->fix.altitude);
        }
        if (r->fix.flags & GPS_LOCATION_HAS_SPEED) {
            p += snprintf(p, end-p, " speed=%g", r->fix.speed);
        }
        if (r->fix.flags & GPS_LOCATION_HAS_BEARING) {
            p += snprintf(p, end-p, " bearing=%g", r->fix.bearing);
        }
        if (r->fix.flags & GPS_LOCATION_HAS_ACCURACY) {
            p += snprintf(p,end-p, " accuracy=%g", r->fix.accuracy);
        }
        D("%s",temp);
#endif
        if (r->location_cb) {
            r->location_cb( &r->fix );
            r->fix.flags = 0;
        }
        else {
            D("no location_cb, keeping data until needed !");
        }
    }
}
示例#4
0
static void
nmea_reader_parse( NmeaReader*  r )
{
   /* we received a complete sentence, now parse it to generate
    * a new GPS fix...
    */
    NmeaTokenizer  tzer[1];
    Token          tok;

    if (r->pos < 9) {
         return;
    }

    if (gps_state->callbacks.nmea_cb) {
        struct timeval tv;
        unsigned long long mytimems;
        gettimeofday(&tv,NULL);
        mytimems = tv.tv_sec * 1000 + tv.tv_usec / 1000;
        gps_state->callbacks.nmea_cb(mytimems, r->in, r->pos);
    }

    nmea_tokenizer_init(tzer, r->in, r->in + r->pos);
#ifdef GPS_DEBUG_TOKEN
    {
        int  n;
        D("Found %d tokens", tzer->count);
        for (n = 0; n < tzer->count; n++) {
            Token  tok = nmea_tokenizer_get(tzer,n);
            D("%2d: '%.*s'", n, tok.end-tok.p, tok.p);
        }
    }
#endif

    tok = nmea_tokenizer_get(tzer, 0);

    if (tok.p + 5 > tok.end) {
        /* for $PUNV sentences */
        if ( !memcmp(tok.p, "PUNV", 4) ) {
            Token tok_cfg = nmea_tokenizer_get(tzer,1);

            if (!memcmp(tok_cfg.p, "CFG_R", 5)) {
            } else if ( !memcmp(tok_cfg.p, "QUAL", 4) ) {
                Token  tok_sigma_x   = nmea_tokenizer_get(tzer, 3);

                if (tok_sigma_x.p[0] != ',') {
                    Token tok_accuracy      = nmea_tokenizer_get(tzer, 10);
                    nmea_reader_update_accuracy(r, tok_accuracy);
                }
            } else if (!memcmp(tok_cfg.p, "TIMEMAP", 7))
            {
                Token systime = nmea_tokenizer_get(tzer, 8); // system time token
                Token timestamp = nmea_tokenizer_get(tzer, 2); // UTC time token
                nmea_reader_update_timemap(r, systime, timestamp);
            }
        }else{
        }
        return;
    }

	if ( !memcmp(tok.p, "GPG", 3) ) //GPGSA,GPGGA,GPGSV
		bGetFormalNMEA = 1;
    // ignore first two characters.
    tok.p += 2;

    if ( !memcmp(tok.p, "GGA", 3) ) {
        // GPS fix
        Token  tok_fixstaus      = nmea_tokenizer_get(tzer,6);

        if (tok_fixstaus.p[0] > '0') {

          Token  tok_time          = nmea_tokenizer_get(tzer,1);
          Token  tok_latitude      = nmea_tokenizer_get(tzer,2);
          Token  tok_latitudeHemi  = nmea_tokenizer_get(tzer,3);
          Token  tok_longitude     = nmea_tokenizer_get(tzer,4);
          Token  tok_longitudeHemi = nmea_tokenizer_get(tzer,5);
          Token  tok_altitude      = nmea_tokenizer_get(tzer,9);
          Token  tok_altitudeUnits = nmea_tokenizer_get(tzer,10);

          nmea_reader_update_time(r, tok_time);
          nmea_reader_update_latlong(r, tok_latitude,
                                        tok_latitudeHemi.p[0],
                                        tok_longitude,
                                        tok_longitudeHemi.p[0]);
          nmea_reader_update_altitude(r, tok_altitude, tok_altitudeUnits);
        }

    } else if ( !memcmp(tok.p, "GLL", 3) ) {

        Token  tok_fixstaus      = nmea_tokenizer_get(tzer,6);

        if (tok_fixstaus.p[0] == 'A') {

          Token  tok_latitude      = nmea_tokenizer_get(tzer,1);
          Token  tok_latitudeHemi  = nmea_tokenizer_get(tzer,2);
          Token  tok_longitude     = nmea_tokenizer_get(tzer,3);
          Token  tok_longitudeHemi = nmea_tokenizer_get(tzer,4);
          Token  tok_time          = nmea_tokenizer_get(tzer,5);

          nmea_reader_update_time(r, tok_time);
          nmea_reader_update_latlong(r, tok_latitude,
                                        tok_latitudeHemi.p[0],
                                        tok_longitude,
                                        tok_longitudeHemi.p[0]);
        }
    } else if ( !memcmp(tok.p, "GSA", 3) ) {

        Token  tok_fixStatus   = nmea_tokenizer_get(tzer, 2);
        int i;

        if (tok_fixStatus.p[0] != '\0' && tok_fixStatus.p[0] != '1') {

          r->sv_status.used_in_fix_mask = 0ul;

          for (i = 3; i <= 14; ++i){

            Token  tok_prn  = nmea_tokenizer_get(tzer, i);
            int prn = str2int(tok_prn.p, tok_prn.end);

            /* only available for PRN 1-32 */
            if ((prn > 0) && (prn < 33)){
              r->sv_status.used_in_fix_mask |= (1ul << (prn-1));
              r->sv_status_changed = 1;
              /* mark this parameter to identify the GSA is in fixed state */
              r->gsa_fixed = 1;
            }
          }

        }else {
          if (r->gsa_fixed == 1) {
            r->sv_status.used_in_fix_mask = 0ul;
            r->sv_status_changed = 1;
            r->gsa_fixed = 0;
          }
        }
    } else if ( !memcmp(tok.p, "GSV", 3) ) {

        Token  tok_noSatellites  = nmea_tokenizer_get(tzer, 3);
        int    noSatellites = str2int(tok_noSatellites.p, tok_noSatellites.end);

        if (noSatellites > 0) {

          Token  tok_noSentences   = nmea_tokenizer_get(tzer, 1);
          Token  tok_sentence      = nmea_tokenizer_get(tzer, 2);

          int sentence = str2int(tok_sentence.p, tok_sentence.end);
          int totalSentences = str2int(tok_noSentences.p, tok_noSentences.end);
          int curr;
          int i;

          if (sentence == 1) {
              r->sv_status_changed = 0;
              r->sv_status.num_svs = 0;
          }

          curr = r->sv_status.num_svs;

          i = 0;

          while (i < 4 && r->sv_status.num_svs < noSatellites){

                 Token  tok_prn = nmea_tokenizer_get(tzer, i * 4 + 4);
                 Token  tok_elevation = nmea_tokenizer_get(tzer, i * 4 + 5);
                 Token  tok_azimuth = nmea_tokenizer_get(tzer, i * 4 + 6);
                 Token  tok_snr = nmea_tokenizer_get(tzer, i * 4 + 7);

                 r->sv_status.sv_list[curr].prn = str2int(tok_prn.p, tok_prn.end);
                 r->sv_status.sv_list[curr].elevation = str2float(tok_elevation.p, tok_elevation.end);
                 r->sv_status.sv_list[curr].azimuth = str2float(tok_azimuth.p, tok_azimuth.end);
                 r->sv_status.sv_list[curr].snr = str2float(tok_snr.p, tok_snr.end);

                 r->sv_status.num_svs += 1;

                 curr += 1;

                 i += 1;
          }

          if (sentence == totalSentences) {
              r->sv_status_changed = 1;
          }
        }

    } else if ( !memcmp(tok.p, "RMC", 3) ) {

        Token  tok_fixStatus     = nmea_tokenizer_get(tzer,2);

        if (tok_fixStatus.p[0] == 'A')
        {
          Token  tok_time          = nmea_tokenizer_get(tzer,1);
          Token  tok_latitude      = nmea_tokenizer_get(tzer,3);
          Token  tok_latitudeHemi  = nmea_tokenizer_get(tzer,4);
          Token  tok_longitude     = nmea_tokenizer_get(tzer,5);
          Token  tok_longitudeHemi = nmea_tokenizer_get(tzer,6);
          Token  tok_speed         = nmea_tokenizer_get(tzer,7);
          Token  tok_bearing       = nmea_tokenizer_get(tzer,8);
          Token  tok_date          = nmea_tokenizer_get(tzer,9);

            nmea_reader_update_date( r, tok_date, tok_time );

            nmea_reader_update_latlong( r, tok_latitude,
                                           tok_latitudeHemi.p[0],
                                           tok_longitude,
                                           tok_longitudeHemi.p[0] );

            nmea_reader_update_bearing( r, tok_bearing );
            nmea_reader_update_speed  ( r, tok_speed );
        }

    } else if ( !memcmp(tok.p, "VTG", 3) ) {

        Token  tok_fixStatus     = nmea_tokenizer_get(tzer,9);

        if (tok_fixStatus.p[0] != '\0' && tok_fixStatus.p[0] != 'N')
        {
            Token  tok_bearing       = nmea_tokenizer_get(tzer,1);
            Token  tok_speed         = nmea_tokenizer_get(tzer,5);

            nmea_reader_update_bearing( r, tok_bearing );
            nmea_reader_update_speed  ( r, tok_speed );
        }

    } else if ( !memcmp(tok.p, "ZDA", 3) ) {

        Token  tok_time;
        Token  tok_year  = nmea_tokenizer_get(tzer,4);

        if (tok_year.p[0] != '\0') {

          Token  tok_day   = nmea_tokenizer_get(tzer,2);
          Token  tok_mon   = nmea_tokenizer_get(tzer,3);

          nmea_reader_update_cdate( r, tok_day, tok_mon, tok_year );

        }

        tok_time  = nmea_tokenizer_get(tzer,1);

        if (tok_time.p[0] != '\0') {

          nmea_reader_update_time(r, tok_time);

        }


    } else {
        tok.p -= 2;
    }

    if (!gps_state->first_fix &&
        gps_state->init == STATE_INIT &&
        r->fix.flags & GPS_LOCATION_HAS_LAT_LONG) {

        ath_send_ni_notification(r);

        if (gps_state->callbacks.location_cb) {
            gps_state->callbacks.location_cb( &r->fix );
            r->fix.flags = 0;
        }

        gps_state->first_fix = 1;
    }
}
示例#5
0
static void
nmea_reader_parse( NmeaReader*  r )
{
   /* we received a complete sentence, now parse it to generate
    * a new GPS fix...
    */
    NmeaTokenizer  tzer[1];
    Token          tok;

    D("Received: '%.*s'", r->pos, r->in);
    if (r->pos < 9) {
        D("Too short. discarded.");
        return;
    }

    nmea_tokenizer_init(tzer, r->in, r->in + r->pos);
#if GPS_DEBUG
    {
        int  n;
        D("Found %d tokens", tzer->count);
        for (n = 0; n < tzer->count; n++) {
            Token  tok = nmea_tokenizer_get(tzer,n);
            D("%2d: '%.*s'", n, tok.end-tok.p, tok.p);
        }
    }
#endif

    tok = nmea_tokenizer_get(tzer, 0);
    if (tok.p + 5 > tok.end) {
        D("sentence id '%.*s' too short, ignored.", tok.end-tok.p, tok.p);
        return;
    }

    // ignore first two characters.
    tok.p += 2;
    if ( !memcmp(tok.p, "GGA", 3) ) {
        // GPS fix
        Token  tok_time          = nmea_tokenizer_get(tzer,1);
        Token  tok_latitude      = nmea_tokenizer_get(tzer,2);
        Token  tok_latitudeHemi  = nmea_tokenizer_get(tzer,3);
        Token  tok_longitude     = nmea_tokenizer_get(tzer,4);
        Token  tok_longitudeHemi = nmea_tokenizer_get(tzer,5);
        Token  tok_altitude      = nmea_tokenizer_get(tzer,9);
        Token  tok_altitudeUnits = nmea_tokenizer_get(tzer,10);

        nmea_reader_update_time(r, tok_time);
        nmea_reader_update_latlong(r, tok_latitude,
                                      tok_latitudeHemi.p[0],
                                      tok_longitude,
                                      tok_longitudeHemi.p[0]);
        nmea_reader_update_altitude(r, tok_altitude, tok_altitudeUnits);

    } else if ( !memcmp(tok.p, "GSA", 3) ) {
#if GPS_SV_INCLUDE

        Token  tok_fixStatus   = nmea_tokenizer_get(tzer, 2);
        int i;

        if (tok_fixStatus.p[0] != '\0' && tok_fixStatus.p[0] != '1') {

            Token  tok_accuracy      = nmea_tokenizer_get(tzer, 15);

            nmea_reader_update_accuracy(r, tok_accuracy);

            r->sv_status.used_in_fix_mask = 0ul;

            for (i = 3; i <= 14; ++i){

                Token  tok_prn  = nmea_tokenizer_get(tzer, i);
                int prn = str2int(tok_prn.p, tok_prn.end);

                D("%s: prn is %d", __FUNCTION__, r->sv_status.used_in_fix_mask);
                if (prn > 0){
                    //r->sv_status.used_in_fix_mask |= (1ul << (32 - prn));
                    r->sv_status.used_in_fix_mask |= (1ul << (prn-1));
                    r->sv_status_changed = 1;
                    D("%s: fix mask is 0x%08X", __FUNCTION__, r->sv_status.used_in_fix_mask);
                }

            }

        }
#endif
        // do something ?
    } else if ( !memcmp(tok.p, "RMC", 3) ) {
        Token  tok_time          = nmea_tokenizer_get(tzer,1);
        Token  tok_fixStatus     = nmea_tokenizer_get(tzer,2);
        Token  tok_latitude      = nmea_tokenizer_get(tzer,3);
        Token  tok_latitudeHemi  = nmea_tokenizer_get(tzer,4);
        Token  tok_longitude     = nmea_tokenizer_get(tzer,5);
        Token  tok_longitudeHemi = nmea_tokenizer_get(tzer,6);
        Token  tok_speed         = nmea_tokenizer_get(tzer,7);
        Token  tok_bearing       = nmea_tokenizer_get(tzer,8);
        Token  tok_date          = nmea_tokenizer_get(tzer,9);

        D("in RMC, fixStatus=%c", tok_fixStatus.p[0]);
        if (tok_fixStatus.p[0] == 'A')
        {
            nmea_reader_update_date( r, tok_date, tok_time );

            nmea_reader_update_latlong( r, tok_latitude,
                                           tok_latitudeHemi.p[0],
                                           tok_longitude,
                                           tok_longitudeHemi.p[0] );

            nmea_reader_update_bearing( r, tok_bearing );
            nmea_reader_update_speed  ( r, tok_speed );
        }
    } else if ( !memcmp(tok.p, "GSV", 3) ) {
#if GPS_SV_INCLUDE
        Token  tok_noSatellites  = nmea_tokenizer_get(tzer, 3);
        int    noSatellites = str2int(tok_noSatellites.p, tok_noSatellites.end);

        if (noSatellites > 0) {

            Token  tok_noSentences   = nmea_tokenizer_get(tzer, 1);
            Token  tok_sentence      = nmea_tokenizer_get(tzer, 2);

            int sentence = str2int(tok_sentence.p, tok_sentence.end);
            int totalSentences = str2int(tok_noSentences.p, tok_noSentences.end);
            int curr;
            int i;

            if (sentence == 1) {
                r->sv_status_changed = 0;
                r->sv_status.num_svs = 0;
            }

            curr = r->sv_status.num_svs;

            i = 0;

            while (i < 4 && r->sv_status.num_svs < noSatellites){

                Token  tok_prn = nmea_tokenizer_get(tzer, i * 4 + 4);
                Token  tok_elevation = nmea_tokenizer_get(tzer, i * 4 + 5);
                Token  tok_azimuth = nmea_tokenizer_get(tzer, i * 4 + 6);
                Token  tok_snr = nmea_tokenizer_get(tzer, i * 4 + 7);

                r->sv_status.sv_list[curr].prn = str2int(tok_prn.p, tok_prn.end);
                r->sv_status.sv_list[curr].elevation = str2float(tok_elevation.p, tok_elevation.end);
                r->sv_status.sv_list[curr].azimuth = str2float(tok_azimuth.p, tok_azimuth.end);
                r->sv_status.sv_list[curr].snr = str2float(tok_snr.p, tok_snr.end);

                r->sv_status.num_svs += 1;

                curr += 1;

                i += 1;
            }

            if (sentence == totalSentences) {
                r->sv_status_changed = 1;
            }
        
			D("%s: GSV message with total satellites %d", __FUNCTION__, noSatellites);   
        
		}else if (noSatellites == 0) { 
			  
			D("%s: GSV message, There are no satellites %d", __FUNCTION__, noSatellites);   
			//[SMIT] wwwen: While we can't get Satellites, we report a simular Satellites(10) to test UART 
			r->sv_status_changed = 1; 
			r->sv_status.num_svs = 0; 
			r->sv_status.sv_list[0].prn = 10;
			r->sv_status.sv_list[0].elevation = 0; 
			r->sv_status.sv_list[0].azimuth = 0; 
			r->sv_status.sv_list[0].snr = -1;
			r->sv_status.num_svs += 1;
		}    

#endif
    } else {
        tok.p -= 2;
        D("unknown sentence '%.*s", tok.end-tok.p, tok.p);
    }
	if (r->fix.flags & GPS_LOCATION_HAS_LAT_LONG) {
		r->fix.flags |=GPS_LOCATION_HAS_SPEED;  
		r->fix.flags |=GPS_LOCATION_HAS_ACCURACY;  
		r->fix.flags |=GPS_LOCATION_HAS_BEARING;  
		r->fix.flags |=GPS_LOCATION_HAS_ALTITUDE;  
#if GPS_DEBUG
        char   temp[256];
        char*  p   = temp;
        char*  end = p + sizeof(temp);
        struct tm   utc;

        p += snprintf( p, end-p, "sending fix" );
        if (r->fix.flags & GPS_LOCATION_HAS_LAT_LONG) {
            p += snprintf(p, end-p, " lat=%g lon=%g", r->fix.latitude, r->fix.longitude);
        }
        if (r->fix.flags & GPS_LOCATION_HAS_ALTITUDE) {
            p += snprintf(p, end-p, " altitude=%g", r->fix.altitude);
        }
        if (r->fix.flags & GPS_LOCATION_HAS_SPEED) {
            p += snprintf(p, end-p, " speed=%g", r->fix.speed);
        }
        if (r->fix.flags & GPS_LOCATION_HAS_BEARING) {
            p += snprintf(p, end-p, " bearing=%g", r->fix.bearing);
        }
        if (r->fix.flags & GPS_LOCATION_HAS_ACCURACY) {
            p += snprintf(p,end-p, " accuracy=%g", r->fix.accuracy);
        }
        gmtime_r( (time_t*) &r->fix.timestamp, &utc );
        p += snprintf(p, end-p, " time=%s", asctime( &utc ) );
        D("%s", temp);
#endif
        if (r->callback) {
            r->callback( &r->fix );
            r->fix.flags = 0;
        }
        else {
            D("no callback, keeping data until needed !");
        }
#if GPS_SV_INCLUDE
        if ((r->sv_status_changed == 1) && (r->sv_callback)){
            r->sv_callback(&r->sv_status);
            r->sv_status_changed = 0;
        }
        else{
            D("no sv callback, keeping data until needed !");
        }
#endif
    }
}