[Rxtx] Baud rate problem
depmar at poczta.onet.pl
Sat Apr 28 01:22:17 MDT 2012
I also have problems with 38400 baud rate on Linux. It works fine with
2.1.7r2 but not with 2.2-pre2.
From: rxtx-bounces at qbang.org [mailto:rxtx-bounces at qbang.org] On Behalf Of
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
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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