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Re: [sc-users] Further serial port question
Hello again Marije and all;
I finally managed to resolve this issue, and thought I would give you
an update for the sake of anyone else who may ever find themselves
facing this obscure issue.
On OS X, the "B" prefix for baudrate definitions is pretty much
redundant; the sys/termios.h file effectively reverts them to integer
values
(e.g. #define B76800 76800)
I have been led to understand the definitions on other systems may
vary, hence the use of the "B" prefix to allow appropriate cross-
platform definitions. Essentially, the "B" prefixed baudrates serve as
convenience variables that can be set on a per-OS basis. The current
SC code accepts integer inputs and maps them onto these cross-platform
"B" variables.
My problem was that the baudrate I needed to set (921600) is not part
of the standard list, meaning that the "case... break" structure you
are using for setting port speeds couldn't be extended.
In the end, the functional solution turned out to be fairly easy;
simply remove the whole "case..break" structure, define baudrate in
the struct as a speed_t rather than a size_t, and call
cfsetispeed(&toptions, m_options.baudrate );
cfsetospeed(&toptions, m_options.baudrate);
with appropriate error-detection if... throw wrappers.
The FTDI device driver handles the rest, in some manner which is, I
fear, still opaque to me. I am also not sure how, or even if, this
solution could be made elegantly cross-platform, so it may be no more
than a patch for this specific need. However, it does work (!)
Thanks again for your suggestions,
Hans
On 5-Mar-09, at 8:24 AM, Hans Samuelson wrote:
Hi Marije;
This doesn't work, since B921600 is not defined in the sys/termios.h
file in OS X (legacy issue).
That's the heart of the problem!
Thanks anyway. I am still working on this; if anyone has any other
suggestions they would be most welcome.
Best,
Hans
On 4-Mar-09, at 8:20 AM, nescivi wrote:
Hiho,
try compiling SC with:
#if defined(B921600)
case 921600:
brate = B921600;
break;
#endif
added at line 243 in Source/lang/LangPrimSource/PyrSerialPrim.cpp
This will only work if OSX actually supports this baudrate.
I hope this helps.
sincerely,
Marije
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