[Rxtx] Baud rate problem

[M.Dec-GM]

Hi all,
It looks very mysterious - computer can not divide factors for 38400 and 
divides good for other bauds????
Have you checked connected device?
Maybe there is not really 38400 and something near and therefore there is a 
difference between RXTX versions.

Or there is a problem in this particular Linux distibution where obtaining 
this baud rate in system doesn't work.

Try to connect at this speed without Java and check if works.

Mariusz



----- Original Message ----- 
From: "Marcin" <depmar at poczta.onet.pl>
To: <rxtx at qbang.org>
Sent: Saturday, April 28, 2012 9:22 AM
Subject: Re: [Rxtx] Baud rate problem


>I also have problems with 38400 baud rate on Linux. It works fine with
> 2.1.7r2 but not with 2.2-pre2.
>
> -----Original Message-----
> From: rxtx-bounces at qbang.org [mailto:rxtx-bounces at qbang.org] On Behalf Of
> Mike Markowski
> Sent: Friday, April 27, 2012 11:42 PM
> To: rxtx at qbang.org
> Subject: Re: [Rxtx] Baud rate problem
>
> If you ever need 38400 baud tested, please let me know.  I have a device
> that uses that baud.  At the moment, it communicates fine with 2.1.7r2 but
> not 2.2-pre2.
>
> Thanks,
> Mike
>
> On 04/22/2012 01:36 PM, Trent Jarvi wrote:
>>
>> 38400 should be supported on Linux.  Testing baudrate code in rxtx
>> isnt very easy because testing is usually done with a loopback
>> connector.  The baudrate always matches itself.
>>
>> A serial port has a crystal that is used to generate a baudbase.
>> 128000 is fairly common.  The frequency is then divided to produce
>> lower baudrates.  Divide by 1 and its 128000.  Divide by 13 and you
>> get 9600.
>>
>> The BaudBase and Divisor are in the structure returned from  ioctl(
>> fd, TIOCGSERIAL, &sstruct );.
>>
>> When the baudrate is set to B38400 (a C define used for 38400
>> baudrates), you can modify the divisor to generate rates that are not
>> predifined in the C header files.
>>
>> BaudRate = BaudBase/Divisor.
>>
>> Many common rates are predifined for programmers but the struct is
>> there for other rates.
>>
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