public async override Task DisconnectAsync()
{
await _semaphoreSlimConnect.WaitAsync();
if (Connected)
{
// make sure we're in a halfway known state...
var dxCommand = new StopDataAcquisitionCommand();
await SimpleCommandTxRxAsync(dxCommand);
// close the serial port
serialPort.Close();
}
_semaphoreSlimConnect.Release();
}
public async override Task ConnectAsync()
{
await _semaphoreSlimConnect.WaitAsync();
// already connected
if (Connected)
return;
serialPort.Open();
// make sure we're in a halfway known state...
var dxCommand = new StopDataAcquisitionCommand();
await serialPort.WriteAsync(dxCommand.Command.Select(x => (byte)x).ToArray(), 0, dxCommand.Command.Length);
await Task.Delay(100);
serialPort.DiscardInBuffer();
await WaitForStabilizedMotorSpeedAsync(TimeSpan.FromSeconds(10), throwOnFail: true);
await UpdateDeviceInfoAsync();
_semaphoreSlimConnect.Release();
}
public async override Task StopScanAsync()
{
if (!Connected)
throw new LidaRxStateException("This instance is not yet connected to the Sweep scanner.");
await _semaphoreSlimScanStart.WaitAsync();
// send a stop command to sweep
var cmd = new StopDataAcquisitionCommand();
var cmdBytes = cmd.Command.Select(x => (byte)x).ToArray();
await serialPort.WriteAsync(cmdBytes, 0, cmdBytes.Length);
// stop the threads
scanProcessingCts.Cancel();
// wait for termination
while (this.scanProcessingThreads.Any(x => x.IsAlive))
{
await Task.Delay(1);
}
this.scanProcessingThreads.Clear();
this.rxScanBuffer.Clear();
await Task.Delay(1);
serialPort.DiscardInBuffer();
// send a second DX command
await serialPort.WriteAsync(cmdBytes, 0, cmdBytes.Length);
// throwaway stuff in the RX buffer!
Thread.Sleep(1);
serialPort.DiscardInBuffer();
this._isScanning = false;
_semaphoreSlimScanStart.Release();
}