/// <summary>
/// Close the serial port connection
/// </summary>
public void Close()
{
StopReading();
_serial.Close();
OnStatusChanged?.Invoke(this, "Connection closed.");
OnSerialPortOpened?.Invoke(this, false);
}
/// <summary>
/// Open the serial port connection
/// </summary>
/// <param name="portname">ttyUSB0 / ttyUSB1 / ttyUSB2 / etc.</param>
/// <param name="baudrate">115200</param>
/// <param name="parity">None / Odd / Even / Mark / Space</param>
/// <param name="databits">5 / 6 / 7 / 8</param>
/// <param name="stopbits">None / One / Two / OnePointFive</param>
/// <param name="handshake">None / XOnXOff / RequestToSend / RequestToSendXOnXOff</param>
public void Open(
string portname = "/dev/ttyUSB0",
int baudrate = 115200,
Parity parity = Parity.None,
int databits = 8,
StopBits stopbits = StopBits.One,
Handshake handshake = Handshake.None)
{
Close();
try
{
_serial.PortName = $"{portname}";
_serial.BaudRate = baudrate;
_serial.Parity = parity;
_serial.DataBits = databits;
_serial.StopBits = stopbits;
_serial.Handshake = handshake;
_serial.ReadTimeout = 300;
_serial.WriteTimeout = 300;
_serial.Open();
_serial.DiscardInBuffer();
_serial.DiscardOutBuffer();
StartReading();
}
catch (IOException exception)
{
OnStatusChanged?.Invoke(this, $"{portname} does not exist.{Environment.NewLine}{exception.StackTrace}");
}
catch (UnauthorizedAccessException exception)
{
OnStatusChanged?.Invoke(this, $"{portname} already in use.{Environment.NewLine}{exception.StackTrace}");
}
catch (Exception ex)
{
OnStatusChanged?.Invoke(this, "Error: " + ex.Message);
}
if (_serial.IsOpen)
{
var sb = StopBits.None.ToString().Substring(0, 1);
switch (_serial.StopBits)
{
case StopBits.One:
sb = "1";
break;
case StopBits.OnePointFive:
sb = "1.5";
break;
case StopBits.Two:
sb = "2";
break;
}
var p = _serial.Parity.ToString().Substring(0, 1);
var hs = _serial.Handshake == Handshake.None ? "No Handshake" :
_serial.Handshake.ToString();
OnStatusChanged?.Invoke(this,
$"Connected to {_serial.PortName}: {_serial.BaudRate} bps, " +
"{_serial.DataBits}{p}{sb}, {hs}.");
OnSerialPortOpened?.Invoke(this, true);
}
else
{
OnStatusChanged?.Invoke(this, $"{portname} already in use.");
OnSerialPortOpened?.Invoke(this, false);
}
}