private void SetHandshake(Handshake handshake)
{
Termios termios = GetTermios();
switch (handshake)
{
case Handshake.None:
termios.ControlFlag &= ~(uint)(ControlFlags.CRTSCTS | ControlFlags.CDTRCTS);
termios.InputFlag &= ~(uint)(InputFlags.IXON | InputFlags.IXOFF);
break;
case Handshake.XOnXOff:
termios.ControlFlag &= ~(uint)(ControlFlags.CRTSCTS | ControlFlags.CDTRCTS);
termios.InputFlag |= (uint)(InputFlags.IXON | InputFlags.IXOFF);
break;
case Handshake.RequestToSend:
termios.ControlFlag |= (uint)ControlFlags.CRTSCTS;
termios.ControlFlag &= (uint)ControlFlags.CDTRCTS;
termios.InputFlag &= ~(uint)(InputFlags.IXON | InputFlags.IXOFF);
break;
case Handshake.RequestToSendXOnXOff:
termios.ControlFlag |= (uint)ControlFlags.CRTSCTS;
termios.ControlFlag &= (uint)ControlFlags.CDTRCTS;
termios.InputFlag |= (uint)(InputFlags.IXON | InputFlags.IXOFF);
break;
default:
break;
}
SetTermios(termios);
}
private void SetDataBits(int dataBits)
{
Termios termios = GetTermios();
termios.ControlFlag &= ~(uint)ControlFlags.CSIZE;
switch (dataBits)
{
case 5:
termios.ControlFlag |= (uint)ControlFlags.CS5;
break;
case 6:
termios.ControlFlag |= (uint)ControlFlags.CS6;
break;
case 7:
termios.ControlFlag |= (uint)ControlFlags.CS7;
break;
default:
case 8:
termios.ControlFlag |= (uint)ControlFlags.CS8;
break;
}
SetTermios(termios);
}
public static byte[] getBytes(Termios str)
{
int size = Marshal.SizeOf(str);
byte[] arr = new byte[size];
IntPtr ptr = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(str, ptr, true);
Marshal.Copy(ptr, arr, 0, size);
Marshal.FreeHGlobal(ptr);
return(arr);
}
public static Termios fromBytes(byte[] arr)
{
Termios str = new Termios();
//Debug.WriteLine(Marshal.SizeOf(str));
int size = Marshal.SizeOf(str);
IntPtr ptr = Marshal.AllocHGlobal(size);
Marshal.Copy(arr, 0, ptr, size);
str = (Termios)Marshal.PtrToStructure(ptr, str.GetType());
Marshal.FreeHGlobal(ptr);
return(str);
}
private void SetParity(Parity parity)
{
Termios termios = GetTermios();
switch (parity)
{
default:
case Parity.None:
termios.ControlFlag &= ~(uint)ControlFlags.PARENB;
termios.ControlFlag &= ~(uint)ControlFlags.PARODD;
//termios.InputFlag &= ~(uint)InputFlags.INPCK;
//termios.InputFlag &= ~(uint)InputFlags.PARMRK;
break;
case Parity.Odd:
termios.ControlFlag |= (uint)ControlFlags.PARENB;
termios.ControlFlag |= (uint)ControlFlags.PARODD;
//termios.InputFlag |= (uint)InputFlags.INPCK;
//termios.InputFlag &= ~(uint)InputFlags.PARMRK;
break;
case Parity.Even:
termios.ControlFlag |= (uint)ControlFlags.PARENB;
termios.ControlFlag &= ~(uint)ControlFlags.PARODD;
//termios.InputFlag |= (uint)InputFlags.INPCK;
//termios.InputFlag &= ~(uint)InputFlags.PARMRK;
break;
case Parity.Mark:
termios.ControlFlag |= (uint)ControlFlags.PARENB;
termios.ControlFlag |= (uint)ControlFlags.PARODD;
termios.ControlFlag |= (uint)ControlFlags.CMSPAR;
//termios.InputFlag |= (uint)InputFlags.INPCK;
//termios.InputFlag |= (uint)InputFlags.PARMRK;
break;
case Parity.Space:
termios.ControlFlag |= (uint)ControlFlags.PARENB;
termios.ControlFlag &= ~(uint)ControlFlags.PARODD;
termios.ControlFlag |= (uint)ControlFlags.CMSPAR;
//termios.InputFlag |= (uint)InputFlags.INPCK;
//termios.InputFlag |= (uint)InputFlags.PARMRK;
break;
}
SetTermios(termios);
}
/// <summary>
/// Open the serial port
/// </summary>
public void Open()
{
if (IsOpen)
{
throw new IOException($"Port already open");
}
// open serial port
int fd = Libc.open(_PortName, Libc.OpenFlags.O_RDWR | Libc.OpenFlags.O_NONBLOCK);
if (fd == -1)
{
throw new Exception($"failed to open port ({_PortName})");
}
_FileDescriptor = fd;
// Initilise the serial port
Termios termios = GetTermios();
// Make sure we are ok to read
termios.ControlFlag |= (uint)ControlFlags.CREAD;
termios.ControlFlag |= (uint)ControlFlags.CLOCAL;
//Clean the output flags
termios.OutputFlag &= ~(uint)OutputFlags.OPOST;
// Clear what can be on the input flags
termios.InputFlag &= ~(uint)(InputFlags.IGNBRK | InputFlags.BRKINT | InputFlags.ICRNL |
InputFlags.PARMRK | InputFlags.INLCR | InputFlags.ISTRIP | InputFlags.IXON);
// Set ICANON off
termios.LocalFalg &= ~(uint)LocalFlags.ICANON;
// Set ECHO off
termios.LocalFalg &= ~(uint)LocalFlags.ECHO;
termios.LocalFalg &= ~(uint)LocalFlags.ECHOE;
termios.LocalFalg &= ~(uint)LocalFlags.ECHOCTL;
termios.LocalFalg &= ~(uint)LocalFlags.IEXTEN;
termios.LocalFalg &= ~(uint)LocalFlags.ISIG;
SetTermios(termios);
SetBaudRate(_BaudRate);
SetDataBits(_DataBits);
SetParity(_Parity);
SetStopBits(_StopBits);
// start reading
Task.Run((Action)StartReading, _CancellationToken);
}
private void SetStopBits(StopBits stopBits)
{
Termios termios = GetTermios();
switch (stopBits)
{
case StopBits.One:
termios.ControlFlag &= ~(uint)ControlFlags.CSTOPB;
break;
case StopBits.Two:
termios.ControlFlag |= (uint)ControlFlags.CSTOPB;
break;
default:
case StopBits.None:
case StopBits.OnePointFive:
throw new ArgumentException($"StopBits only support One or Two");
break;
}
SetTermios(termios);
}
private void SetTermios(Termios terminos)
{
byte[] termiosData = TermiosHelpers.getBytes(terminos);
Libc.tcsetattr(_FileDescriptor.Value, 0, termiosData);
}