On Fri, 24 Sep 1999, Richard Chan wrote:
> I have tried to drop DTR and RTS using
> ioctl(fd, TIOCMBIC, TIOCM_DTR)
> and ioctl(fd, TIOCMBIC, TIOCM_RTS)
> but two calls have absolutely no effect on the lines
> (by checking with a break-out box).
>From my forthcoming Serial-Programming-HOWTO ( it will be out whenever
I can get an SGML formatter to work ).
---------------------- HOWTO -----------------------
The hardware modem control lines can be monitored or modified by
the 'ioctl(2)' system call. A set of comparable 'tc*' calls
apparentlty do not exist. The form of this call is:
int ioctl( 'fd', COMMAND, (int *)flags );
The bit pattern of 'flags' refer to the following control lines:
TIOCM_LE Line enable
TIOCM_DTR Data Terminal Ready
TIOCM_RTS Request to send
TIOCM_ST Secondary transmit
TIOCM_SR Secondary receive
TIOCM_CTS Clear to send
TIOCM_CAR Carrier detect
TIOCM_RNG Ring
TIOCM_DSR Data set ready
The COMMANDS and their action are:
TIOCMBIS turn on control lines depending upon which bits
are set in 'flags'.
TIOCMBIC turn off control lines depending upon which bits
are set in 'flags'.
TIOCMGET the appropiate bits are set in 'flags' according
to the current status
TIOCMSET the state of the UART is changed according to which
bits are set/unset in 'flags'
----------------------- End HOWTO ----------------------
Read my 'serial_suite.tgz'. This is a collection of blurbs about the
care and feeding of the serial ports and some simple programs. There is
a file demonstrating how the lock files should be programmed. There
is a simple getty, a dialer for ppp connections and some other misc
programs.
Via ftp:
ftp scicom.alphacdc.com
Login as "anonymous" then use your full e-mail address as the password.
For me, that is '[EMAIL PROTECTED]'.
cd pub/linux
or:
URL ftp://scicom.alphacdc.com/pub/linux
vern
--
Vernon C. Hoxie [EMAIL PROTECTED]
3975 W. 29th Ave. uucp: 303-455-2670
Denver, Colo., 80212 voice: 303-477-1780
A person is not old until regrets take the place of dreams.
-
To unsubscribe from this list: send the line "unsubscribe linux-serial" in
the body of a message to [EMAIL PROTECTED]
