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serial port

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* insure that DTR and RTS are always disabled when closing port
This commit is contained in:
David Freese 2020-01-12 20:46:49 -06:00
parent 055d756020
commit b9e0a9a7b7
1 changed files with 12 additions and 2 deletions
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14
src/rigcontrol/serial.cxx
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@ -246,12 +246,22 @@ void Cserial::ClosePort()
{
if (fd < 0) return;
if (restore_tio) {
tcsetattr (fd, TCSANOW, &oldtio);
// Some serial drivers force RTS and DTR high immediately upon
// opening the port, so our origstatus will indicate those bits
// high (though the lines weren't actually high before we opened).
// But then when we "restore" RTS and DTR from origstatus here
// it can result in PTT activation upon program exit! To avoid
// this possibility, we ignore the apparentl initial settings, and
// instead force RTS and DTR low before closing the port. (Just
// omitting the ioctl(TIOCMSET) would also resolve the problem).
// Kamal Mostafa <kamal@whence.com>
origstatus &= ~(TIOCM_RTS|TIOCM_DTR);
ioctl(fd, TIOCMSET, &origstatus);
tcsetattr (fd, TCSANOW, &oldtio);
}
close(fd);
LOG_INFO("Serial port closed, fd = %d", fd);
fd = -1;
LOG_INFO("Serial port closed, fd = %d", fd);
return;
}