public termios getOptions()
{
termios options;
Syscalls.tcgetattr(_FileDescriptor, out options);
return(options);
}
private void setOptions()
{
termios options;
Syscalls.tcgetattr(_FileDescriptor, out options);
/* Set baud rate */
Syscalls.cfsetspeed(ref options, findBaudrate(_baudRate));
/* These will ensure that the program does not become the 'owner' of the
* port subject to sporatic job control and hangup signals,
* and also that the serial interface driver will read incoming data bytes.
*/
options.c_cflag |= (Macros.CLOCAL | Macros.CREAD);
/* Set byte size */
options.c_cflag &= ~Macros.CSIZE; /* Mask the character size bits */
options.c_cflag |= findByteSize(_dataBits); /* Select 8 data bits */
/* Set parity */
switch (_parity)
{
case Parity.None:
options.c_cflag &= ~Macros.PARENB; /* Mask the parity bits */
break;
case Parity.Odd:
options.c_cflag |= Macros.PARENB; /* Mask the parity bits */
options.c_cflag |= Macros.PARODD;
break;
case Parity.Even:
options.c_cflag |= Macros.PARENB; /* Mask the parity bits */
options.c_cflag &= ~Macros.PARODD;
break;
case Parity.Mark:
throw new NotImplementedException();
case Parity.Space:
throw new NotImplementedException();
}
/* Set stop bits */
if (_stopBits == StopBits.One)
{
options.c_cflag &= ~Macros.CSTOPB;
}
else if (_stopBits == StopBits.Two)
{
options.c_cflag |= Macros.CSTOPB;
}
else
{
throw new ArgumentOutOfRangeException("Only one and two stop bits are supported");
}
/* Dtr Control */
int status = 0;
if (_dtrControl == DtrControl.Enable)
{
Syscalls.ioctl(_FileDescriptor, Macros.TIOCMGET, ref status);
status &= ~Macros.TIOCM_DTR;
Syscalls.ioctl(_FileDescriptor, Macros.TIOCMSET, ref status);
}
// Hardware flow control
/*
*
* try {
* options.c_cflag |= Macros.CNEW_RTSCTS;
* } catch (ArgumentNullException) {
* try {
* options.c_cflag |= Macros.CRTSCTS;
* } catch (ArgumentNullException) {
* throw new HardwareFlowControlNotSupportedException ();
* }
* }
*/
/* Enables software flow control */
/*
* options.c_iflag |= (Macros.IXON | Macros.IXOFF | Macros.IXANY);
*/
/* Choose raw input (as opposed to canonical) */
options.c_lflag &= ~(Macros.ICANON | Macros.ECHO | Macros.ECHOE | Macros.ISIG);
/* Choose raw output (as opposed to canonical) */
options.c_oflag &= ~Macros.OPOST;
/* Enable parity */
options.c_iflag |= (Macros.INPCK | Macros.ISTRIP);
/* Set read time out and behavior */
options.c_cc [Macros.VMIN] = 0;
options.c_cc [Macros.VTIME] = 2; // x100 msec
/* Write out the options */
Syscalls.tcsetattr(_FileDescriptor, Macros.TCSAFLUSH, ref options);
/* Read time*/
Syscalls.fcntl(_FileDescriptor, Macros.F_SETFL, 0);
termios check = getOptions();
if (check.c_iflag != options.c_iflag)
{
throw new InvalidOperationException();
}
}