/// <summary>
/// Connects to the specified serial port and sends the observable sequence of Harp messages.
/// The return value is an observable sequence of Harp messages coming from the device.
/// </summary>
/// <param name="source">An observable sequence of Harp messages to send to the device.</param>
/// <returns>The observable sequence of Harp messages produced by the device.</returns>
public IObservable <HarpMessage> Generate(IObservable <HarpMessage> source)
{
return(Observable.Create <HarpMessage>(observer =>
{
var transport = new SerialTransport(PortName, observer);
transport.IgnoreErrors = IgnoreErrors;
transport.Open();
var writeOpCtrl = HarpCommand.OperationControl(DeviceState, LedState, VisualIndicators, Heartbeat, CommandReplies, DumpRegisters);
transport.Write(writeOpCtrl);
var sourceDisposable = new SingleAssignmentDisposable();
sourceDisposable.Disposable = source.Subscribe(
transport.Write,
observer.OnError,
observer.OnCompleted);
var cleanup = Disposable.Create(() =>
{
writeOpCtrl = HarpCommand.OperationControl(DeviceState.Standby, LedState, VisualIndicators, Heartbeat, CommandReplies, false);
transport.Write(writeOpCtrl);
});
return new CompositeDisposable(
cleanup,
sourceDisposable,
transport);
}));
}
/// <summary>
/// Initializes a new instance of the <see cref="AsyncDevice"/> class on
/// the specified port.
/// </summary>
/// <param name="portName">The name of the serial port used to communicate with the Harp device.</param>
public AsyncDevice(string portName)
{
response = new Subject <HarpMessage>();
transport = new SerialTransport(portName, response);
transport.IgnoreErrors = true;
transport.Open();
transport.Write(HarpCommand.OperationControl(
DeviceState.Standby,
LedState.On,
LedState.On,
EnableType.Disable,
EnableType.Enable,
false));
}
/// <summary>
/// Connects to the specified serial port and returns an observable sequence of Harp messages
/// coming from the device.
/// </summary>
/// <returns>The observable sequence of Harp messages produced by the device.</returns>
public override IObservable <HarpMessage> Generate()
{
return(Observable.Create <HarpMessage>(observer =>
{
var transport = new SerialTransport(PortName, observer);
transport.IgnoreErrors = IgnoreErrors;
transport.Open();
var writeOpCtrl = HarpCommand.OperationControl(DeviceState, LedState, VisualIndicators, Heartbeat, CommandReplies, DumpRegisters);
transport.Write(writeOpCtrl);
var cleanup = Disposable.Create(() =>
{
writeOpCtrl = HarpCommand.OperationControl(DeviceState.Standby, LedState, VisualIndicators, Heartbeat, CommandReplies, false);
transport.Write(writeOpCtrl);
});
return new CompositeDisposable(
cleanup,
transport);
}));
}
static IObservable <string> GetDeviceName(string portName, LedState ledState, LedState visualIndicators, EnableType heartbeat)
{
return(Observable.Create <string>(observer =>
{
var transport = default(SerialTransport);
var writeOpCtrl = HarpCommand.OperationControl(DeviceState.Standby, ledState, visualIndicators, heartbeat, EnableType.Enable, false);
var cmdReadWhoAmI = HarpCommand.ReadUInt16(Registers.WhoAmI);
var cmdReadMajorHardwareVersion = HarpCommand.ReadByte(Registers.HardwareVersionHigh);
var cmdReadMinorHardwareVersion = HarpCommand.ReadByte(Registers.HardwareVersionLow);
var cmdReadMajorFirmwareVersion = HarpCommand.ReadByte(Registers.FirmwareVersionHigh);
var cmdReadMinorFirmwareVersion = HarpCommand.ReadByte(Registers.FirmwareVersionLow);
var cmdReadTimestampSeconds = HarpCommand.ReadUInt32(Registers.TimestampSecond);
var cmdReadDeviceName = HarpCommand.ReadByte(Registers.DeviceName);
var cmdReadSerialNumber = HarpCommand.ReadUInt16(Registers.SerialNumber);
var whoAmI = 0;
var timestamp = 0u;
var hardwareVersionHigh = 0;
var hardwareVersionLow = 0;
var firmwareVersionHigh = 0;
var firmwareVersionLow = 0;
var serialNumber = default(ushort?);
var messageObserver = Observer.Create <HarpMessage>(
message =>
{
switch (message.Address)
{
case Registers.OperationControl:
transport.Write(cmdReadWhoAmI);
transport.Write(cmdReadMajorHardwareVersion);
transport.Write(cmdReadMinorHardwareVersion);
transport.Write(cmdReadMajorFirmwareVersion);
transport.Write(cmdReadMinorFirmwareVersion);
transport.Write(cmdReadTimestampSeconds);
transport.Write(cmdReadSerialNumber);
transport.Write(cmdReadDeviceName);
break;
case Registers.WhoAmI: whoAmI = message.GetPayloadUInt16(); break;
case Registers.HardwareVersionHigh: hardwareVersionHigh = message.GetPayloadByte(); break;
case Registers.HardwareVersionLow: hardwareVersionLow = message.GetPayloadByte(); break;
case Registers.FirmwareVersionHigh: firmwareVersionHigh = message.GetPayloadByte(); break;
case Registers.FirmwareVersionLow: firmwareVersionLow = message.GetPayloadByte(); break;
case Registers.TimestampSecond: timestamp = message.GetPayloadUInt32(); break;
case Registers.SerialNumber: if (!message.Error)
{
serialNumber = message.GetPayloadUInt16();
}
break;
case Registers.DeviceName:
var deviceName = nameof(Device);
if (!message.Error)
{
var namePayload = message.GetPayload();
deviceName = Encoding.ASCII.GetString(namePayload.Array, namePayload.Offset, namePayload.Count);
}
Console.WriteLine("Serial Harp device.");
if (!serialNumber.HasValue)
{
Console.WriteLine($"WhoAmI: {whoAmI}");
}
else
{
Console.WriteLine($"WhoAmI: {whoAmI}-{serialNumber:x4}");
}
Console.WriteLine($"Hw: {hardwareVersionHigh}.{hardwareVersionLow}");
Console.WriteLine($"Fw: {firmwareVersionHigh}.{firmwareVersionLow}");
Console.WriteLine($"Timestamp (s): {timestamp}");
Console.WriteLine($"DeviceName: {deviceName}");
Console.WriteLine();
observer.OnNext(deviceName);
observer.OnCompleted();
break;
default:
break;
}
},
observer.OnError,
observer.OnCompleted);
transport = new SerialTransport(portName, messageObserver);
transport.IgnoreErrors = true;
transport.Open();
transport.Write(writeOpCtrl);
return transport;
}).Timeout(TimeSpan.FromMilliseconds(500))
.OnErrorResumeNext(Observable.Return(nameof(Device)))
.SubscribeOn(Scheduler.Default)
.FirstAsync());
}