void Parse(string fileName)
{
var lines = File.ReadAllLines(fileName);
var bmpLines = lines.Where(l => l.StartsWith("BMP"));
var gpsLines = lines.Where(l => l.StartsWith("GPS") && l.Contains("$"));
File.WriteAllLines(fileName + ".baro", bmpLines);
File.WriteAllLines(fileName + ".gps", gpsLines.Select(l => l.Substring(l.IndexOf('$'))));
// Convert barometer data into something we can work with
BarometerReadings = bmpLines.ToList().ConvertAll(new Converter<string, BarometerReading>(s => BarometerReading.FromLogFileLine(s)));
// Convert gps data into something we can work with
GpsGgaReadings = new List<GpsGgaReading>();
var haveFix = false;
foreach (var line in gpsLines)
{
try
{
var parts = line.Split(',');
if (haveFix && parts[2] == "$GPRMC")
ParseGprmc(parts);
else if (parts[2] == "$GPGGA")
{
var r = GpsGgaReading.FromLogLine(line);
GpsGgaReadings.Add(r);
if (r.Fix == GpsGgaReading.FixQuality.GPS)
haveFix = true;
}
}
catch (Exception)
{
// TODO: report issues when parsing lines
}
}
// Fix up times (hopefully we have got something from the GPS
if (null == TimeSync)
TimeSync = new TimeSync { Date = DateTime.Today };
BarometerReadings.ForEach(r => r.LogStartTime = TimeSync.ZeroDate);
GpsGgaReadings.ForEach(r => r.LogStartTime = TimeSync.ZeroDate);
}
/// <summary>
/// GPRMC sentences contain date/time information. We can correlate this with
/// the timestamps from the Arduino clock to work out the real time of the
/// barometer readings.
/// </summary>
private void ParseGprmc(string[] parts)
{
/*
$GPRMC,174439.000,A,5140.4799,N,00446.6480,W,0.00,223.26,100712,,,A*7D
Recommended minimum specific GPS/Transit data
eg1. $GPRMC,081836,A,3751.65,S,14507.36,E,000.0,360.0,130998,011.3,E*62
eg2. $GPRMC,225446,A,4916.45,N,12311.12,W,000.5,054.7,191194,020.3,E*68
225446 Time of fix 22:54:46 UTC
A Navigation receiver warning A = OK, V = warning
4916.45,N Latitude 49 deg. 16.45 min North
12311.12,W Longitude 123 deg. 11.12 min West
000.5 Speed over ground, Knots
054.7 Course Made Good, True
191194 Date of fix 19 November 1994
020.3,E Magnetic variation 20.3 deg East
*68 mandatory checksum
*/
var t = new TimeSync();
t.TimeStamp = int.Parse(parts[1]);
int year = 2000 + int.Parse(parts[11].Substring(4, 2));
int month = int.Parse(parts[11].Substring(2, 2));
int day = int.Parse(parts[11].Substring(0, 2));
int hour = int.Parse(parts[3].Substring(0, 2));
int minute = int.Parse(parts[3].Substring(2, 2));
int second = int.Parse(parts[3].Substring(4, 2));
t.Date = new DateTime(year, month, day, hour, minute, second);
if (null == TimeSync)
TimeSync = t;
else
if (!t.IsCompatibleWith(TimeSync))
throw new ApplicationException("timesync issue");
}
public bool IsCompatibleWith(TimeSync t)
{
return Math.Abs((this.ZeroDate - t.ZeroDate).TotalSeconds) < 10;
}
