private void Timer_Tick(object state)
{
int count;
lock (_sync)
{
count = (_count = ++_count) % HeartRates.Length;
}
HeartRateUpdated?.Invoke(HeartRates[count]);
}
private void Timer_Tick(object state)
{
int count;
lock (_sync)
{
count = _count = ++_count;
if (count >= HeartRates.Length)
{
return;
}
}
HeartRateUpdated?.Invoke(HeartRates[count]);
}
public void HeartRate_ValueChanged(
GattCharacteristic sender,
GattValueChangedEventArgs args)
{
var buffer = args.CharacteristicValue;
if (buffer.Length == 0)
{
return;
}
var byteBuffer = Interlocked.Exchange(ref _buffer, null)
?? new byte[buffer.Length];
if (byteBuffer.Length != buffer.Length)
{
byteBuffer = new byte[buffer.Length];
}
try
{
using var reader = DataReader.FromBuffer(buffer);
reader.ReadBytes(byteBuffer);
var readingValue = ReadBuffer(byteBuffer, (int)buffer.Length);
if (readingValue == null)
{
Debug.WriteLine($"Buffer was too small. Got {buffer.Length}.");
return;
}
var reading = readingValue.Value;
Debug.WriteLine($"Read {reading.Flags:X} {reading.Status} {reading.BeatsPerMinute}");
HeartRateUpdated?.Invoke(reading);
}
finally
{
Volatile.Write(ref _buffer, byteBuffer);
}
}
private void HeartRate_ValueChanged(
GattCharacteristic sender,
GattValueChangedEventArgs args)
{
var value = args.CharacteristicValue;
if (value.Length == 0)
{
return;
}
using (var reader = DataReader.FromBuffer(value))
{
byte[] data = new byte[value.Length];
reader.ReadBytes(data);
var bpm = -1;
var flags = data[0];
var isshort = (flags & 1) == 1; // 1 == UINT16
var contactSensor = (ContactSensorStatus)((flags >> 1) & 3);
var minLength = isshort ? 3 : 2;
if (value.Length < minLength)
{
Debug.WriteLine($"Buffer was too small. Got {value.Length}, expected {minLength}.");
return;
}
HeartRateServiceData hrsd = new HeartRateServiceData(data);
LogData(hrsd);
bpm = hrsd.HeartRateMeasurement;
Debug.WriteLine($"Read {flags.ToString("X")} {contactSensor} {bpm}");
foreach (var rr in hrsd.RRIntervals)
{
Debug.WriteLine($"RR Interval {rr}");
}
HeartRateUpdated?.Invoke(contactSensor, bpm);
}
}
public void HeartRate_ValueChanged(
GattCharacteristic sender,
GattValueChangedEventArgs args)
{
var value = args.CharacteristicValue;
if (value.Length == 0)
{
return;
}
using (var reader = DataReader.FromBuffer(value))
{
var bpm = -1;
var flags = reader.ReadByte();
var isshort = (flags & 1) == 1;
var contactSensor = (ContactSensorStatus)((flags >> 1) & 3);
var minLength = isshort ? 3 : 2;
if (value.Length < minLength)
{
Debug.WriteLine($"Buffer was too small. Got {value.Length}, expected {minLength}.");
return;
}
if (value.Length > 1)
{
bpm = isshort
? reader.ReadUInt16()
: reader.ReadByte();
}
Debug.WriteLine($"Read {flags:X} {contactSensor} {bpm}");
HeartRateUpdated?.Invoke(contactSensor, bpm);
}
}
protected virtual void OnHeartRateUpdated()
=> HeartRateUpdated?.Invoke(
this,
new HeartBeatEventArgs(PreviousHeartBeat, CurrentHeartBeat));
