private void SaveToDatabase()
{
try
{
if (_hrQueue.Count > 0)
{
_isConnectedToBluetoothDevice = true;
var measurements = new List <HeartRateMeasurement>();
HeartRateMeasurement measurement = null;
while (!_hrQueue.IsEmpty)
{
_hrQueue.TryDequeue(out measurement);
if (measurement != null)
{
if (!double.IsNaN(_previousRR))
{
measurement.RRDifference = Math.Abs(measurement.RRInterval - _previousRR);
}
_previousRR = measurement.RRInterval;
measurements.Add(measurement);
}
}
if (Settings.IsDetailedCollectionEnabled)
{
DatabaseConnector.AddHeartMeasurementsToDatabase(measurements, false);
}
var ts = (measurements.Count >= 0) ? measurements[0].Timestamp : string.Empty;
var heartRateValues = measurements.Where(x => !double.IsNaN(x.HeartRateValue)).Select(x => x.HeartRateValue);
var rrdifferences = measurements.Where(x => !double.IsNaN(x.RRDifference)).Select(x => x.RRDifference);
var rrintervals = measurements.Where(x => !double.IsNaN(x.RRInterval)).Select(x => x.RRInterval);
var averages = new HeartRateMeasurement()
{
HeartRateValue = (heartRateValues.Count() == 0) ? double.NaN : heartRateValues.Average(),
RRDifference = (rrdifferences.Count() == 0) ? double.NaN : rrdifferences.Average(),
RRInterval = (rrintervals.Count() == 0) ? double.NaN : rrintervals.Average(),
Timestamp = ts
};
DatabaseConnector.AddHeartMeasurementsToDatabase(new List <HeartRateMeasurement>()
{
averages
}, true);
}
else
{
_isConnectedToBluetoothDevice = false;
Logger.WriteToConsole("Nothing to save...");
}
}
catch (Exception e)
{
Logger.WriteToLogFile(e);
}
}
public static HeartRateMeasurement GetHeartRate(byte[] data)
{
// Heart Rate profile defined flag values
const byte HEART_RATE_VALUE_FORMAT = 0x01;
const byte ENERGY_EXPANDED_STATUS = 0x08;
const byte RR = 0x10;
// get flags
byte currentOffset = 0;
byte flags = data[currentOffset];
currentOffset++;
var measurment = new HeartRateMeasurement();
// get heart rate value
if ((flags & HEART_RATE_VALUE_FORMAT) != 0)
{
measurment.HeartRateValue = BitConverter.ToUInt16(data, currentOffset);// (ushort)((data[currentOffset + 1] << 8) + data[currentOffset]);
currentOffset += 2;
}
else
{
measurment.HeartRateValue = data[currentOffset];
currentOffset++;
}
// get expended energy
if ((flags & ENERGY_EXPANDED_STATUS) != 0)
{
measurment.HasExpendedEnergy = true;
measurment.ExpendedEnergy = (ushort)((data[currentOffset + 1] << 8) + data[currentOffset]);
currentOffset += 2;
}
else
{
measurment.HasExpendedEnergy = false;
}
if ((flags & RR) != 0)
{
// R-R information
int rrCount = (data.Length - currentOffset) / 2;
measurment.RRValues = new int[rrCount];
for (int i = 0; i < rrCount; i++)
{
measurment.RRValues[i] = BitConverter.ToUInt16(data, currentOffset);
currentOffset += 2;
}
}
// The Heart Rate Bluetooth profile can also contain sensor contact status information,
// and R-Wave interval measurements, which can also be processed here.
// For the purpose of this sample, we don't need to interpret that data.
return(measurment);
}
