bool
EWMicroRecorderDevice::ParseNMEA(const char *String, NMEA_INFO &info)
{
if (!VerifyNMEAChecksum(String))
return false;
NMEAInputLine line(String);
char type[16];
line.read(type, 16);
if (strcmp(type, "$PGRMZ") == 0) {
fixed value;
/* The normal Garmin $PGRMZ line contains the "true" barometric
altitude above MSL (corrected with QNH), but EWMicroRecorder
differs here slightly: it emits the uncorrected barometric
altitude. That is the only reason why we catch this sentence
in the driver instead of letting the generic class NMEAParser
do it. */
if (ReadAltitude(line, value))
info.ProvidePressureAltitude(value);
return true;
} else
return false;
}
/**
* Parse a "$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;
}