Jef Driesen b9a3606f37 Add a workaround for the hwOS ppO2 firmware bug
Due to a bug in the hwOS Tech firmware v3.03 to v3.07, and the hwOS
Sport firmware v10.57 to v10.63, the ppO2 divisor is sometimes not
correctly reset to zero when no ppO2 samples are being recorded.

Usually this condition can be detected by the fact that the length of
the extended sample will not have enough space left for the ppO2 sample
(9 bytes). As a workaround, reset the divisor back to zero to manually
disable the ppO2 samples.

In theory this detection method is not 100% reliable. There can still be
other sample types present in the extended sample. If their total size
is larger than 9 bytes, the bug will not be detected at all. Instead,
those bytes will get interpreted as the ppO2 sample, resulting in bogus
ppO2 values. Additionally, one of the other sample types will now run
out of space and cause the parsing to fail with an error. However, in
practice this risk is relative low. Most of the other samples are
relative small (1 or 2 bytes), so you would need many of them. That's
rather unlikely in most configurations. The only exception is the large
deco plan sample (15 bytes).
2019-11-22 22:59:25 +01:00
2018-08-27 10:28:02 +02:00
2014-03-19 09:16:07 +01:00
2017-11-24 23:47:58 +01:00

Overview
========

Libdivecomputer is a cross-platform and open source library for
communication with dive computers from various manufacturers.

The official web site is:

  http://www.libdivecomputer.org/

The sourceforge project page is:

  http://sourceforge.net/projects/libdivecomputer/

Installation
============

On UNIX-like systems (including Linux, Mac OS X, MinGW), use the
autotools based build system. Run the following commands from the top
directory (containing this file) to configure, build and install the
library and utilities:

  $ ./configure
  $ make
  $ make install

If you downloaded the libdivecomputer source code directly from the git
source code repository, then you need to create the configure script as
the first step:

  $ autoreconf --install

To uninstall libdivecomputer again, run:

  $ make uninstall

Support
=======

Please send bug reports, feedback or questions to the mailing list:

  http://libdivecomputer.org/cgi-bin/mailman/listinfo/devel

or contact me directly:

  jef@libdivecomputer.org

License
=======

Libdivecomputer is free software, released under the terms of the GNU
Lesser General Public License (LGPL).

You can find a copy of the license in the file COPYING.
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