On 02. 12. 20, 12:48, Johan Hovold wrote:
but I question the
usefulness of doing so, as it is a chicken and egg problem: one needs
to open the tty device in order to do termios ioctls on it, and if
that initial open triggers DTR/RTS hardware actions, then the end user
is still screwed. If Johan or someone else can see a potential use
case for manipulating this new flag via termios (as opposed to sysfs
or USB-ID-based driver quirks), perhaps you could elaborate on it?
We would need to (ab)use another open flag (e.g. O_DIRECT). I am not
biased to either of solutions.
Forgot to mention that using open-flags would prevent using standard
utilities like cat, echo and terminal programs. So for that reason a
termios and/or sysfs interface is also preferred.
Nope, I meant it differently. You set it up once using the special open
flag. Like with setserial, one sets I/O port, irqs etc. and then uses
standard tools as the port is already set up (marked as NORDY in this case).
thanks,
--
js
