public void HandleMidiMessage(MidiMessage theMessage)
{
//theDevice.FlashLed(1, 10);
mrSound.ProcessMessage(theMessage);
}
//LISTEN FOR NEXT RECEIVE
private async Task <int> Listen()
{
const int NUMBER_OF_BYTES_TO_RECEIVE = 1; //<<<<<SET THE NUMBER OF BYTES YOU WANT TO WAIT FOR
byte[] ReceiveData;
UInt32 bytesRead;
MidiMessage ChannelMessage = new MidiMessage();
//MidiMessage GlobalMessage = new MidiMessage();
try
{
if (UartPort != null)
{
while (true)
{
//###### WINDOWS IoT MEMORY LEAK BUG 2017-03 - USING CancellationToken WITH LoadAsync() CAUSES A BAD MEMORY LEAK. WORKAROUND IS
//TO BUILD RELEASE WITHOUT USING THE .NET NATIVE TOOLCHAIN OR TO NOT USE A CancellationToken IN THE CALL #####
//bytesRead = await DataReaderObject.LoadAsync(NUMBER_OF_BYTES_TO_RECEIVE).AsTask(ReadCancellationTokenSource.Token); //Wait until buffer is full
Windows.Foundation.IAsyncOperation <uint> taskLoad = DataReaderObject.LoadAsync(NUMBER_OF_BYTES_TO_RECEIVE);
taskLoad.AsTask().Wait();
bytesRead = taskLoad.GetResults();
//bytesRead = await DataReaderObject.LoadAsync(NUMBER_OF_BYTES_TO_RECEIVE).AsTask(); //Wait until buffer is full
if ((ReadCancellationTokenSource.Token.IsCancellationRequested) || (UartPort == null))
{
break;
}
if (bytesRead > 0)
{
ReceiveData = new byte[NUMBER_OF_BYTES_TO_RECEIVE];
DataReaderObject.ReadBytes(ReceiveData);
foreach (byte Data in ReceiveData)
{
//-------------------------------
//-------------------------------
//----- RECEIVED NEXT BYTE ------
//-------------------------------
//-------------------------------
if (Data >= 0x80 && Data <= 0xEF) //new Channel Message
{
if (ChannelMessage.IsSet1) //We already have data in this object
{
//there is data in the current message
RouteMessage(ChannelMessage);
ChannelMessage = new MidiMessage(Data);
}
else //No data in the message
{
ChannelMessage.Status = Data;
if (MidiMessage.ByteCount(ChannelMessage.MessageClass) == 0)
{
RouteMessage(ChannelMessage);
ChannelMessage = new MidiMessage();
}
}
}
else //not a status byte
{
if (ChannelMessage.Status != 0 && !ChannelMessage.IsSet1)
{
ChannelMessage.Data1 = Data;
if (MidiMessage.ByteCount(ChannelMessage.MessageClass) == 1)
{
RouteMessage(ChannelMessage);
ChannelMessage = new MidiMessage();
}
}
else //Data1 is full
{
if (ChannelMessage.Status != 0 && !ChannelMessage.IsSet2)
{
ChannelMessage.Data2 = Data;
RouteMessage(ChannelMessage);
ChannelMessage = new MidiMessage();
}
}
}
}
/*if (Data > 0xF0 ) //SysEx message (Global)
* {
* //Throw away data until we get to F7
* }*/
}
} //while
} //check the port
} catch (Exception e)
{
//We will get here often if the USB serial cable is removed so reset ready for a new connection (otherwise a never ending error occurs)
if (ReadCancellationTokenSource != null)
{
ReadCancellationTokenSource.Cancel();
}
System.Diagnostics.Debug.WriteLine("UART ReadAsync Exception: {0}", e.Message);
}
return(await Task.FromResult(0));
}