Your message dated Wed, 26 Feb 2014 05:48:35 +0000
with message-id <[email protected]>
and subject line Bug#740098: fixed in rxtx 2.2pre2-12
has caused the Debian Bug report #740098,
regarding librxtx-java: setting speed to 38400 doesn't work on some (many?)
USB-serial-adapters
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
740098: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=740098
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: librxtx-java
Version: 2.2pre2-11
Severity: normal
Hi,
I got an issue with 2.2pre2-11 not working, while 2.1.7r2-4 does.
(And it's been this way since I upgraded the host from lenny to squeeze.
Didn't have time to investigate back then, but now, while upgrading to
wheezy, I had a look at it, again.)
Some debugging showed that there is some bad interaction with a bugfix
introduced in 2.2pre2 and missing capabilities of the USB-serial
adapters:
Let me start by giving some explanation why the 38400 speed is special:
Usually, one sets the speed of a serial line by calling cfsetispeed /
cfsetospeed. The speed parameter must come from a fixed list of
predefined constants, for example B38400 for 38400 bps.
However, as not all possible speeds are covered by these constants,
there is a second mechanism: The constant B38400 is overloaded. The
manual page of cfsetispeed says:
"The actual bit rate corresponding to B38400 may be altered with
setserial(8)."
Of course, that rate can not only be set with setserial, but there is a
C API, as well, albeit badly documented. I found a short code sample here:
http://ubuntuforums.org/showthread.php?t=1206637
So to set the custom speed, one calls TIOCGSERIAL, sets custom_divisor
to baud_base / (desired speed), flags t0 ASYNC_SPD_CUST and calls
TIOCSSERIAL.
Now, selecting B38400 actually selects a different speed.
Of course, if one really wants to set 38400 bps, one has to be careful:
Maybe the last selected speed was such a custom one, so just selecting
B38400 wouldn't give the expected result, but instead select the custom
speed, again. Therefore, when switching back to B38400, one has to undo
the custom-speed-selection done before.
The mechanism to reset to 'real' B38400 was, AFAIKT, implemented in
2.2pre2.
Unfortunately, the way it was implemented, it just assumes that the
TIOCGSERIAL and TIOCSSERIAL are always available. This is probably true
for conventional serial ports, often based on the 16550 UART.
But for USB adapters, I already saw two different failure modes: In one
case, TIOCGSERIAL was not implemented, in the other, it was, but
TIOCSSERIAL was not.
In both cases, rxtx 2.2pre2-11 fails to set B38400.
To fix this issue, when selecting B38400, it's necessary to handle the
failure of TIOCGSERIAL and/or TIOCSSERIAL.
I'm already working on a patch, and as this bug is several years old,
there is probably no need for immediate action :-)
Regards,
Jan
-- System Information:
Debian Release: 7.4
APT prefers stable
APT policy: (989, 'stable'), (500, 'oldstable'), (99, 'unstable'), (1,
'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 3.13.5-smapi-x61s-amd64-00006-g962aefc (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages librxtx-java depends on:
ii libc6 2.13-38+deb7u1
librxtx-java recommends no packages.
librxtx-java suggests no packages.
-- no debconf information
--- End Message ---
--- Begin Message ---
Source: rxtx
Source-Version: 2.2pre2-12
We believe that the bug you reported is fixed in the latest version of
rxtx, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
tony mancill <[email protected]> (supplier of updated rxtx package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
Format: 1.8
Date: Tue, 25 Feb 2014 20:46:17 -0800
Source: rxtx
Binary: librxtx-java librxtx-java-dbg
Architecture: source amd64
Version: 2.2pre2-12
Distribution: unstable
Urgency: medium
Maintainer: Debian Java maintainers
<[email protected]>
Changed-By: tony mancill <[email protected]>
Description:
librxtx-java - Full Java CommAPI implementation
librxtx-java-dbg - Full Java CommAPI implementation, Debugging Symbols
Closes: 731151 740098
Changes:
rxtx (2.2pre2-12) unstable; urgency=medium
.
* Team upload.
* Apply patch for USB serial adapters at 38400 (Closes: #740098)
- Thank you to Jan Niehusmann for the analysis and patch.
* Apply patch for buffer overflow with long paths. (Closes: #731151)
- Thank you to Jose Luis Guardiola for the patch.
* Remove DMUA field from debian/control.
* Bump DH dependency from 8 to 9.
- Add patch for compilation with format-security as error.
* Bump Standards-Version to 3.9.5.
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