protected override void Dispose(bool disposing)
{
try {
if (disposing)
{
_port.Close();
}
} finally {
base.Dispose(disposing);
}
}
public CloseResult Close()
{
try
{
_parser.CommandComplete -= CommandComplete;
_port.DataReceived -= DataReceived;
_worker.DoWork -= SendCommandAsync;
_worker.RunWorkerCompleted -= SendCommandAsyncComplete;
_port.Close();
_commandQueue.Clear();
return(CloseResult.Closed);
}
catch (InvalidOperationException exception)
{
Log.Warn("Cannot close port.", exception);
return(CloseResult.PortIsNotOpen);
}
}
private void DoWork(object tokenObject)
{
var cancellationToken = (CancellationToken)tokenObject;
ISerialPortWrapper serialPort = null;
if (String.IsNullOrEmpty(UserSettings.ComPort))
{
_log.Warn("Cannot start the serial sending because the comport is not selected.");
return;
}
frameCounter = 0;
blackFrameCounter = 0;
//retry after exceptions...
while (!cancellationToken.IsCancellationRequested)
{
try
{
const int baudRate = 1000000;
string openedComPort = null;
while (!cancellationToken.IsCancellationRequested)
{
//open or change the serial port
if (openedComPort != UserSettings.ComPort)
{
serialPort?.Close();
serialPort = UserSettings.ComPort != "Fake Port"
? (ISerialPortWrapper) new WrappedSerialPort(new SerialPort(UserSettings.ComPort, baudRate))
: new FakeSerialPort();
try
{
serialPort.Open();
}
catch
{
// useless UnauthorizedAccessException
}
if (!serialPort.IsOpen)
{
serialPort = null;
//allow the system some time to recover
Thread.Sleep(500);
continue;
}
openedComPort = UserSettings.ComPort;
}
//send frame data
var(outputBuffer, streamLength) = GetOutputStream();
serialPort.Write(outputBuffer, 0, streamLength);
if (++frameCounter == 1024 && blackFrameCounter > 1000)
{
//there is maybe something wrong here because most frames where black. report it once per run only
var settingsJson = JsonConvert.SerializeObject(UserSettings, Formatting.None);
_log.Info($"Sent {frameCounter} frames already. {blackFrameCounter} were completely black. Settings= {settingsJson}");
}
ArrayPool <byte> .Shared.Return(outputBuffer);
//ws2812b LEDs need 30 µs = 0.030 ms for each led to set its color so there is a lower minimum to the allowed refresh rate
//receiving over serial takes it time as well and the arduino does both tasks in sequence
//+1 ms extra safe zone
var fastLedTime = (streamLength - _messagePreamble.Length - _messagePostamble.Length) / 3.0 * 0.030d;
var serialTransferTime = streamLength * 10.0 * 1000.0 / baudRate;
var minTimespan = (int)(fastLedTime + serialTransferTime) + 1;
Thread.Sleep(minTimespan);
}
}
catch (OperationCanceledException)
{
_log.Debug("OperationCanceledException catched. returning.");
return;
}
catch (Exception ex)
{
if (ex.GetType() != typeof(AccessViolationException) && ex.GetType() != typeof(UnauthorizedAccessException))
{
_log.Debug(ex, "Exception catched.");
}
//to be safe, we reset the serial port
if (serialPort != null && serialPort.IsOpen)
{
serialPort.Close();
}
serialPort?.Dispose();
serialPort = null;
//allow the system some time to recover
Thread.Sleep(500);
}
finally
{
if (serialPort != null && serialPort.IsOpen)
{
serialPort.Close();
serialPort.Dispose();
}
}
}
}