private async Task SendReadEvent()
{
if (_serialPort != null && Mode == SensorMode.Active)
{
ReadingComplete?.Invoke(this, new ReadingArgs(ReadingTime));
}
}
public void Listen(IUniverse uni)
{
ProcessBeforeFrame(uni);
uni.FrameFinished += (sender, e) =>
{
T res = ProcessAfterFrame(uni);
ReadingComplete?.Invoke(this, new FrameReading <T>(res, e.FrameLength));
};
}
private async Task Listen()
{
byte[] ReceiveData;
UInt32 bytesRead;
try
{
if (_serialPort != null)
{
while (true)
{
if (_readCancellationTokenSource.Token.IsCancellationRequested || (_serialPort == null))
{
break;
}
bytesRead = await _dataReader.LoadAsync(1).AsTask(_readCancellationTokenSource.Token);
if (bytesRead == 1)
{
byte StartData = _dataReader.ReadByte();
if (!_readCancellationTokenSource.Token.IsCancellationRequested)
{
//looking for a 0x42, 0x4D as a data start marker
if (StartData == 0x42)
{
bytesRead = await _dataReader.LoadAsync(1).AsTask(_readCancellationTokenSource.Token);
if (bytesRead == 1)
{
if (!_readCancellationTokenSource.Token.IsCancellationRequested)
{
byte StartData2 = _dataReader.ReadByte();
if (StartData2 == 0x4D)
{
//next 2 bytes contain the framelength
bytesRead = await _dataReader.LoadAsync(2).AsTask(_readCancellationTokenSource.Token);
if (bytesRead == 2)
{
if (!_readCancellationTokenSource.Token.IsCancellationRequested)
{
byte[] FrameHeader = new byte[2];
_dataReader.ReadBytes(FrameHeader);
uint framelength = PMSConvert(FrameHeader[0], FrameHeader[1]);
bytesRead = await _dataReader.LoadAsync(framelength).AsTask(_readCancellationTokenSource.Token);
if (!_readCancellationTokenSource.Token.IsCancellationRequested)
{
if (bytesRead == framelength)
{
ReceiveData = new byte[framelength];
_dataReader.ReadBytes(ReceiveData);
//do checksum test remembering to add in the previous bytes
uint checksum = (uint)(0x42 + 0x4D + FrameHeader[0] + FrameHeader[1]);
for (int i = 0; i < ReceiveData.Length - 2; i++)
{
checksum += ReceiveData[i];
}
if (!_readCancellationTokenSource.Token.IsCancellationRequested)
{
if (ReceiveData.Length == 28) //receiving expected data
{
uint checksumcheck = PMSConvert(ReceiveData[framelength - 2], ReceiveData[framelength - 1]);
if (checksum == checksumcheck)
{
ReadingTime = DateTime.Now;
PM1_0Concentration_CF1 = PMSConvert(ReceiveData[0], ReceiveData[1]);
PM2_5Concentration_CF1 = PMSConvert(ReceiveData[2], ReceiveData[3]);
PM10_0Concentration_CF1 = PMSConvert(ReceiveData[4], ReceiveData[5]);
PM1_0Concentration_amb = PMSConvert(ReceiveData[6], ReceiveData[7]);
PM2_5Concentration_amb = PMSConvert(ReceiveData[8], ReceiveData[9]);
PM10_0Concentration_amb = PMSConvert(ReceiveData[10], ReceiveData[11]);
PM0_3Count = PMSConvert(ReceiveData[12], ReceiveData[13]);
PM0_5Count = PMSConvert(ReceiveData[14], ReceiveData[15]);
PM1_0Count = PMSConvert(ReceiveData[16], ReceiveData[17]);
PM2_5Count = PMSConvert(ReceiveData[18], ReceiveData[19]);
PM5_0Count = PMSConvert(ReceiveData[20], ReceiveData[21]);
PM10_0Count = PMSConvert(ReceiveData[22], ReceiveData[23]);
ProductVersion = ReceiveData[24];
StatusCodes = ReceiveData[25];
if (Mode == SensorMode.Passive || ReadingInterval == 0)
{
//raise the event that there is a new reading available
ReadingComplete?.Invoke(this, new ReadingArgs(ReadingTime));
}
}
}
else
{
Debug.Write("Some other kind of response: ");
foreach (var item in ReceiveData)
{
Debug.WriteLine(" {0} ", item);
}
Debug.WriteLine("");
}
}
}
}
}
}
}
else
{
Debug.WriteLine("Alignment issue 2 read non header character {0}", StartData2);
}
}
}
}
else
{
Debug.WriteLine("Alignment issue read non header character {0}", StartData);
}
}
}
}
}
}
catch (Exception ex)
{
if (_readCancellationTokenSource != null)
{
_readCancellationTokenSource.Cancel();
}
System.Diagnostics.Debug.WriteLine("UART ReadAsync Exception: {0}", ex.Message);
}
}