On Thu, Oct 25, 2007 at 08:52:48AM -0700, Brooks Talley wrote:
> Thanks to everyone who applied. The OpenBSD approach to setting UFTDI baud
> rates is definitely superior.
>
> However, the root of my problem turned out to be Python. Even with the new
> baud rate hardcoded in the UFTDI kernel module and manually added to
> termios.h, Python was refusing to admit that it was a valid baud rate.
>
> The issue is that Python (2.5.1) compiles its own termios interface module,
> which builds a list of allowed baud rates from the defines in termios.h.
> Python's termios.c does something like this:
>
> include <termios.h>
> termios_constants[] = {
> {"B300",B300},
> {"B1200",B1200},
> {"B2400",B2400},
> .
> .
> .
> #ifdef B115200
> {"B115200",B115200}
> #endif
> #ifdef B230400
> {"B230400",B230400}
> #endif
>
> So of course my new buad rate never got added to the list. It's a fairly
> ugly problem, because the valud baud rates are set in #defines in termios.h
> and Python wants an array of them, and of course there's no way (that I know
> of) to enumerate defines and get a list of those that start with "B" followed
> by numbers (and, of course, for all I know there's some other BXXXXX define
> somewhere that is not intended to indicate an allowed baud rate).
>
> The real solution would be to use the OpenBSD UFTDI baud rate generator and
> update Python's termios.c to avoid the list of valid baud rates and have it
> just ask the serial port to set the requested rate and report back any error.
> But that requires far more than my meager skills. I just added another
> hardcoded #ifdef to Python's termios.c and it is all working now.
I will take care about the ftdi driver within the next days, but will
not MFC it until the releases are done.
The python part is left for someone else.
--
B.Walter http://www.bwct.de http://www.fizon.de
[EMAIL PROTECTED] [EMAIL PROTECTED] [EMAIL PROTECTED]
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