// FIXME this needs serious code review from people who know this stuff...
public int updateFromTermios(Port port) throws Fail {
Termios tios = port.m_Termios;
int c_speed = tios.c_ospeed;
int c_cflag = tios.c_cflag;
int c_iflag = tios.c_iflag;
int c_oflag = tios.c_oflag;
if (c_speed != port.m_c_speed
|| c_cflag != port.m_c_cflag
|| c_iflag != port.m_c_iflag
|| c_oflag != port.m_c_oflag) {
DCB dcb = port.m_DCB;
if (!GetCommState(port.m_Comm, dcb)) port.fail();
dcb.DCBlength = dcb.size();
dcb.BaudRate = c_speed;
if (tios.c_ospeed != tios.c_ispeed)
log(0, "c_ospeed (%d) != c_ispeed (%d)\n", tios.c_ospeed, tios.c_ispeed);
int flags = 0;
// rxtx does: if ( s_termios->c_iflag & ISTRIP ) dcb.fBinary = FALSE;
// but Winapi doc says fBinary always true
flags |= fBinary;
if ((c_cflag & PARENB) != 0) flags |= fParity;
if ((c_iflag & IXON) != 0) flags |= fOutX;
if ((c_iflag & IXOFF) != 0) flags |= fInX;
if ((c_iflag & IXANY) != 0) flags |= fTXContinueOnXoff;
if ((c_iflag & CRTSCTS) != 0) {
flags |= fRtsControl;
flags |= fOutxCtsFlow;
}
// Following have no corresponding functionality in unix termios
// fOutxDsrFlow = 0x00000008;
// fDtrControl = 0x00000030;
// fDsrSensitivity = 0x00000040;
// fErrorChar = 0x00000400;
// fNull = 0x00000800;
// fAbortOnError = 0x00004000;
// fDummy2 = 0xFFFF8000;
dcb.fFlags = flags;
// Don't touch these, windows seems to use: XonLim 2048 XoffLim 512 and who am I to argue with
// those
// dcb.XonLim = 0;
// dcb.XoffLim = 128;
byte cs = 8;
int csize = c_cflag & CSIZE;
if (csize == CS5) cs = 5;
if (csize == CS6) cs = 6;
if (csize == CS7) cs = 7;
if (csize == CS8) cs = 8;
dcb.ByteSize = cs;
if ((c_cflag & PARENB) != 0) {
if ((c_cflag & PARODD) != 0 && (c_cflag & CMSPAR) != 0) dcb.Parity = MARKPARITY;
else if ((c_cflag & PARODD) != 0) dcb.Parity = ODDPARITY;
else if ((c_cflag & CMSPAR) != 0) dcb.Parity = SPACEPARITY;
else dcb.Parity = EVENPARITY;
} else dcb.Parity = NOPARITY;
dcb.StopBits = (c_cflag & CSTOPB) != 0 ? TWOSTOPBITS : ONESTOPBIT;
dcb.XonChar =
tios.c_cc[
VSTART]; // In theory these could change but they only get updated if the
// baudrate/char size changes so this could be a time bomb
dcb.XoffChar =
tios.c_cc[
VSTOP]; // In practice in PJC these are never changed so updating on the first pass is
// enough
dcb.ErrorChar = 0;
// rxtx has some thing like
// if ( EV_BREAK|EV_CTS|EV_DSR|EV_ERR|EV_RING | ( EV_RLSD & EV_RXFLAG )
// )
// dcb.EvtChar = '\n';
// else
// dcb.EvtChar = '\0';
// But those are all defines so there is something fishy there?
dcb.EvtChar = '\n';
dcb.EofChar = tios.c_cc[VEOF];
if (!SetCommState(port.m_Comm, dcb)) port.fail();
port.m_c_speed = c_speed;
port.m_c_cflag = c_cflag;
port.m_c_iflag = c_iflag;
port.m_c_oflag = c_oflag;
}
int vmin = port.m_Termios.c_cc[VMIN] & 0xFF;
int vtime = (port.m_Termios.c_cc[VTIME] & 0xFF) * 100;
if (vmin != port.m_VMIN || vtime != port.m_VTIME) {
COMMTIMEOUTS touts = port.m_Timeouts;
// There are really no write timeouts in classic unix termios
// FIXME test that we can still interrupt the tread
touts.WriteTotalTimeoutConstant = 0;
touts.WriteTotalTimeoutMultiplier = 0;
if (vmin == 0 && vtime == 0) {
// VMIN = 0 and VTIME = 0 => totally non blocking,if data is
// available, return it, ie this is poll operation
touts.ReadIntervalTimeout = MAXDWORD;
touts.ReadTotalTimeoutConstant = 0;
touts.ReadTotalTimeoutMultiplier = 0;
}
if (vmin == 0 && vtime > 0) {
// VMIN = 0 and VTIME > 0 => timed read, return as soon as data is
// available, VTIME = total time
touts.ReadIntervalTimeout = 0;
touts.ReadTotalTimeoutConstant = vtime;
touts.ReadTotalTimeoutMultiplier = 0;
}
if (vmin > 0 && vtime > 0) {
// VMIN > 0 and VTIME > 0 => blocks until VMIN chars has arrived or between chars expired,
// note that this will block if nothing arrives
touts.ReadIntervalTimeout = vtime;
touts.ReadTotalTimeoutConstant = 0;
touts.ReadTotalTimeoutMultiplier = 0;
}
if (vmin > 0 && vtime == 0) {
// VMIN > 0 and VTIME = 0 => blocks until VMIN characters have been
// received
touts.ReadIntervalTimeout = 0;
touts.ReadTotalTimeoutConstant = 0;
touts.ReadTotalTimeoutMultiplier = 0;
}
if (!SetCommTimeouts(port.m_Comm, port.m_Timeouts)) port.fail();
port.m_VMIN = vmin;
port.m_VTIME = vtime;
log =
log
&& log(
2,
"vmin %d vtime %d ReadIntervalTimeout %d ReadTotalTimeoutConstant %d ReadTotalTimeoutMultiplier %d\n",
vmin,
vtime,
touts.ReadIntervalTimeout,
touts.ReadTotalTimeoutConstant,
touts.ReadTotalTimeoutMultiplier);
}
return 0;
}
