static bool
ReadLatitude(NMEAInputLine &line, Angle &value_r)
{
Angle value;
if (!ReadPositiveAngle(line, value))
return false;
if (line.read_first_char() == 'S')
value = -value;
value_r = value;
return true;
}
static bool
ReadAltitude(NMEAInputLine &line, fixed &value_r)
{
fixed value;
bool available = line.read_checked(value);
char unit = line.read_first_char();
if (!available)
return false;
if (unit == _T('f') || unit == _T('F'))
value = Units::ToSysUnit(value, unFeet);
value_r = value;
return true;
}
bool
NMEAParser::GLL(NMEAInputLine &line, NMEAInfo &info)
{
/*
* $--GLL,llll.ll,a,yyyyy.yy,a,hhmmss.ss,a,m,*hh
*
* Field Number:
* 1) Latitude
* 2) N or S (North or South)
* 3) Longitude
* 4) E or W (East or West)
* 5) Universal Time Coordinated (UTC)
* 6) Status A - Data Valid, V - Data Invalid
* 7) FAA mode indicator (NMEA 2.3 and later)
* 8) Checksum
*/
GeoPoint location;
bool valid_location = ReadGeoPoint(line, location);
fixed this_time = TimeModify(line.read(fixed_zero), info.date_time_utc,
info.date_available);
this_time = TimeAdvanceTolerance(this_time);
bool gps_valid = !NAVWarn(line.read_first_char());
if (!TimeHasAdvanced(this_time, info))
return true;
if (!gps_valid)
info.location_available.Clear();
else if (valid_location)
info.location_available.Update(info.clock);
if (valid_location)
info.location = location;
info.gps.real = real;
#ifdef ANDROID
info.gps.android_internal_gps = false;
#endif
return true;
}
/**
* Parses a RMC sentence
*
* $--RMC,hhmmss.ss,A,llll.ll,a,yyyyy.yy,a,x.x,x.x,xxxx,x.x,a,m,*hh
*
* Field Number:
* 1) UTC Time
* 2) Status, V=Navigation receiver warning A=Valid
* 3) Latitude
* 4) N or S
* 5) Longitude
* 6) E or W
* 7) Speed over ground, knots
* 8) Track made good, degrees true
* 9) Date, ddmmyy
* 10) Magnetic Variation, degrees
* 11) E or W
* 12) FAA mode indicator (NMEA 2.3 and later)
* 13) Checksum
* @param String Input string
* @param params Parameter array
* @param nparams Number of parameters
* @param GPS_INFO GPS_INFO struct to parse into
* @return Parsing success
*/
bool
NMEAParser::RMC(NMEAInputLine &line, NMEA_INFO *GPS_INFO)
{
fixed ThisTime = TimeModify(line.read(fixed_zero), GPS_INFO->DateTime);
gpsValid = !NAVWarn(line.read_first_char());
GeoPoint location;
bool valid_location = ReadGeoPoint(line, location);
GPS_STATE &gps = GPS_INFO->gps;
gps.Connected = 2;
if (!activeGPS)
return true;
fixed speed = line.read(fixed_zero);
gps.MovementDetected = speed > fixed_two;
if (gps.Replay)
// block actual GPS signal if not moving and a log is being replayed
return true;
gps.NAVWarning = !gpsValid;
fixed TrackBearing = line.read(fixed_zero);
// JMW get date info first so TimeModify is accurate
char date_buffer[9];
line.read(date_buffer, 9);
GPS_INFO->DateTime.year = atoi(&date_buffer[4]) + 2000;
date_buffer[4] = '\0';
GPS_INFO->DateTime.month = atoi(&date_buffer[2]);
date_buffer[2] = '\0';
GPS_INFO->DateTime.day = atoi(&date_buffer[0]);
if (!TimeHasAdvanced(ThisTime, GPS_INFO))
return false;
if (valid_location)
GPS_INFO->Location = location;
else
GPS_INFO->gps.NAVWarning = true;
GPS_INFO->GroundSpeed = Units::ToSysUnit(speed, unKnots);
if (GPS_INFO->GroundSpeed > fixed_one) {
// JMW don't update bearing unless we're moving
GPS_INFO->TrackBearing = Angle::degrees(TrackBearing).as_bearing();
}
if (!gps.Replay) {
if (RMZAvailable) {
// JMW changed from Altitude to BaroAltitude
GPS_INFO->BaroAltitudeAvailable = true;
GPS_INFO->BaroAltitude = RMZAltitude;
} else if (RMAAvailable) {
// JMW changed from Altitude to BaroAltitude
GPS_INFO->BaroAltitudeAvailable = true;
GPS_INFO->BaroAltitude = RMAAltitude;
}
}
if (!GGAAvailable) {
// update SatInUse, some GPS receiver don't emit GGA sentence
if (!gpsValid)
gps.SatellitesUsed = 0;
else
gps.SatellitesUsed = -1;
}
// say we are updated every time we get this,
// so infoboxes get refreshed if GPS connected
TriggerGPSUpdate();
return true;
}
bool
NMEAParser::RMC(NMEAInputLine &line, NMEAInfo &info)
{
/*
* $--RMC,hhmmss.ss,A,llll.ll,a,yyyyy.yy,a,x.x,x.x,xxxx,x.x,a,m,*hh
*
* Field Number:
* 1) UTC Time
* 2) Status, V=Navigation receiver warning A=Valid
* 3) Latitude
* 4) N or S
* 5) Longitude
* 6) E or W
* 7) Speed over ground, knots
* 8) Track made good, degrees true
* 9) Date, ddmmyy
* 10) Magnetic Variation, degrees
* 11) E or W
* 12) FAA mode indicator (NMEA 2.3 and later)
* 13) Checksum
*/
fixed this_time = line.read(fixed_zero);
bool gps_valid = !NAVWarn(line.read_first_char());
GeoPoint location;
bool valid_location = ReadGeoPoint(line, location);
fixed speed;
bool ground_speed_available = line.read_checked(speed);
fixed track;
bool track_available = line.read_checked(track);
// JMW get date info first so TimeModify is accurate
if (ReadDate(line, info.date_time_utc))
info.date_available = true;
this_time = TimeModify(this_time, info.date_time_utc, info.date_available);
this_time = TimeAdvanceTolerance(this_time);
if (!TimeHasAdvanced(this_time, info))
return true;
if (!gps_valid)
info.location_available.Clear();
else if (valid_location)
info.location_available.Update(info.clock);
if (valid_location)
info.location = location;
if (ground_speed_available) {
info.ground_speed = Units::ToSysUnit(speed, unKnots);
info.ground_speed_available.Update(info.clock);
}
if (track_available && info.MovementDetected()) {
// JMW don't update bearing unless we're moving
info.track = Angle::Degrees(track).AsBearing();
info.track_available.Update(info.clock);
}
info.gps.real = real;
#ifdef ANDROID
info.gps.android_internal_gps = false;
#endif
return true;
}
/**
* Parse a "$FLYSEN" sentence.
*
* @see http://www.flytec.ch/public/Special%20NMEA%20sentence.pdf
*/
static bool
FlytecParseFLYSEN(NMEAInputLine &line, NMEA_INFO &info)
{
fixed value;
// Time(hhmmss), 6 Digits
line.skip();
// Latitude(ddmm.mmm), 8 Digits incl. decimal
// N (or S), 1 Digit
line.skip(2);
// Longitude(dddmm.mmm), 9 Digits inc. decimal
// E (or W), 1 Digit
line.skip(2);
// Track (xxx Deg), 3 Digits
// Speed over Ground (xxxxx cm/s) 5 Digits
// GPS altitude (xxxxx meter), 5 Digits
line.skip(3);
// Validity of 3 D fix A or V, 1 Digit
char validity = line.read_first_char();
if (validity != 'A' && validity != 'V') {
validity = line.read_first_char();
if (validity != 'A' && validity != 'V')
return false;
}
// Satellites in Use (0 to 12), 2 Digits
line.skip();
// Raw pressure (xxxxxx Pa), 6 Digits
if (line.read_checked(value))
info.ProvideStaticPressure(value / 100);
// Baro Altitude (xxxxx meter), 5 Digits (-xxxx to xxxxx) (Based on 1013.25hPa)
if (line.read_checked(value))
info.ProvidePressureAltitude(value);
// Variometer (xxxx cm/s), 4 or 5 Digits (-9999 to 9999)
if (line.read_checked(value))
info.ProvideTotalEnergyVario(value / 100);
// true airspeed (xxxxx cm/s), 5 Digits (0 to 99999cm/s = 3600km/h)
if (line.read_checked(value))
info.ProvideTrueAirspeed(value / 100);
// Airspeed source P or V, 1 Digit P= pitot, V = Vane wheel
// Temp. PCB (xxx °C), 3 Digits
// Temp. Balloon Envelope (xxx °C), 3 Digits
// Battery Capacity Bank 1 (0 to 100%) 3 Digits
// Battery Capacity Bank 2 (0 to 100%) 3 Digits
// Dist. to WP (xxxxxx m), 6 Digits (Max 200000m)
// Bearing (xxx Deg), 3 Digits
// Speed to fly1 (MC0 xxxxx cm/s), 5 Digits
// Speed to fly2 (McC. xxxxx cm/s) 5 Digits
// Keypress Code (Experimental empty to 99) 2 Digits
return true;
}
