At 8:51 AM +1200 6/3/02, Alex Shepherd wrote:
> There's an alternate library (RXTX) for which the source code is
available, and it may well be possible to modify it so that it works.
But this is going _really_ slowly, as I keep having to learn new
Windows stuff. Help from somebody who understands C programming on
Windows would help a lot!
Got a URL for this one - I may be able to have a look, we have the MSDN kit
at work with _all_ the MS dev tools and libraries. Only problem is your
machine just isn't the same after you load it all!!!
That would be _great_!
The code comes from . It's what Mike Davison set up for comms on Linux. I've been working with the 1.4 version 15 from rxtx-1.4-15.tar.gz on their download page.
When I asked their mailing list, Trent Jarvi wrote:
This should be possible with rxtx 1.4 and some modification. At the
moment rxtx supports the speeds Sun javax.comm does (and maybe a couple
more). The speed can be set to custom speeds using the baud_base and
divisor.
sstruct.custom_divisor = ( sstruct.baud_base/cspeed )
Check SerialImp.c and how it sets 14400, 28800, 12800 and 256000
There will be a little more work needed but that should point to where it
can be done.
The LocoNet PE mentions that the rate can be generated with a divisor, so that part should be OK.
Line 450 of SerialImp.c has a case statement that seems to somehow be decoding the cspeed parameter (from a set of flags) into an integer speed. Line 472 then seems to find the right divisor. So I think that if I could just figure out how to get the MS100 baud rate through to there, life would be good.
But I don't understand the "translate_speed" call at line 384, nor the preprocessing (which seems to want _not_ Windows!) at line 428.
translate_speed seems to convert the original integer baud rate to flags. But then the preprocessing at line 428 should be skipped on Windows, leaving it to fall through to line 492. So the question is how Windows wants to have it's baud rate set to a non-standard rate. Does it have cfsetispeed and cfsetospeed calls?
Bob
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Bob Jacobsen (Bob_Jacobsen@..., 510-486-7355, fax 510-495-2957)
Bob Jacobsen