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<TITLE>LIRC - Linux Infrared Remote Control</TITLE>
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<!-- FAQ +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
<A NAME="faq"></A><HR>
<H1 ALIGN="CENTER">FAQ</H1>
<HR WIDTH="70%">
<P>
There are various sources of information you should check before
writing mails directly to <A
HREF="mailto:lirc@bartelmus.de">me</A>. Please read the <A
HREF="http://www.lirc.org/">LIRC homepage</A> carefully and have
a look at the <A HREF="http://www.lirc.org/faq.html">FAQ</A>.
</P>
<P>
If your question is not answered there try the <A
HREF="http://lists.sourceforge.net/mailman/listinfo/lirc-list">LIRC
mailing list</A>. Before posting to the list check the <A
HREF="http://sourceforge.net/mailarchive/forum.php?forum_name=lirc-list">mailing list archive</A> for an answer.
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<H1 ALIGN="CENTER">Reporting bugs</H1>
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<P>
If you believe that you have found a bug in LIRC your bug report
should contain the following information:
</P>
<UL>
<LI>LIRC version, versions of all other packages involved</LI>
<LI>description of the IR hardware you are using</LI>
<LI>Are you using a SMP machine?</LI>
<LI>output of <em>ls -l /dev/lirc*</em></LI>
<LI>output of <em>lsmod</em></LI>
<LI>relevant passages from <em>/var/log/messages</em></LI>
<LI>contents of lircd's logfile <em>/var/log/lircd</em><BR> Compile
LIRC in debug mode. A new command line option
(<em>-d[debug_level]</em>) will become available for
<em>lircd</em>. The debug level (0 to 5) will control how much
additional debug output will be displayed. But be careful with
this. After some extensive debug sessions I once discovered that my
logfile was using 110 MBytes of disk space. :-)</LI>
<LI>a description of the problem so I can reproduce it</LI>
<LI>a patch that solves the problem (this one is optional)</LI>
<LI>the config files you are using (<em>lircd.conf</em>,
<em>lircmd.conf</em>, <em>.lircrc</em>)</LI>
<LI>If you have problems with a config file try to find the
shortest example that does not work as one would expect and
include it.</LI>
</UL>
<P>
If you have problems with one of the TV card drivers you should
write to the according authors directly. You will find their
email addresses in the source code and at the <A
HREF="http://www.lirc.org/developers.html">developers page</A>.
</P>
<!-- New remotes++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
<A NAME="new_remote"></A><HR>
<H1 ALIGN="CENTER">Adding new remote controls</H1>
<HR WIDTH="70%">
<P>
The following description was written having receivers in mind
that deliver IR signals as pulses and spaces. So some of this
will not be relevant for receivers that work at a higher
abstraction layer as <NOBR>e.g.</NOBR> the Irman or TV card
receivers.
</P>
<P>
There already is a growing database of config files for remote
controls available at the LIRC homepage. But if your remote
control is not available yet you can use <em>irrecord</em> to
create a config file for your remote control. If you want to
use more than one remote control you have to create a separate
file for each remote. If your remote control is able to control
different devices it is often wise to create separate config
files for each functional unit of the remote control. You can
later use a single config file for <em>lircd</em> by simply
merging the config files with <NOBR><em>cat config1 config2
>lircd.conf</em></NOBR>.
</P>
<P>
Before using <em>irrecord</em> you should start <em>mode2</em>
and have a look at the signals that your receiver supplies. If
you can see random pulses without pushing any buttons of your
remote control your receiver is picking up ambient light. So if
your receiver has no ambient light filter try to add one. A good
strategy might also be to create a config file in a dark room
and to turn off all fluorescent lamps or any other devices that
may cause IR noise.
</P>
<P>
If decoding of IR commands does not work reliably you can try to
modify the <em>eps</em> and <em>aeps</em> values in the lircd
config file to adjust the tolerance of signal
lengths. <em>aeps</em> is an absolute value while <em>eps</em>
is a relative value expressed in percent. Also if repeats do not
work you should complain. I.e. if you hold down a button the
output of <em>irw</em> should look like this.
</P>
<PRE>
0000000000f40bf0 00 1_DOWN ANIMAX
0000000000f40bf0 01 1_DOWN ANIMAX
0000000000f40bf0 02 1_DOWN ANIMAX
0000000000f40bf0 03 1_DOWN ANIMAX
0000000000f40bf0 04 1_DOWN ANIMAX
0000000000f40bf0 05 1_DOWN ANIMAX</PRE>
<P>
Note how the second field gets incremented. Many people don't
even notice if this does not work correctly.
</P>
<P>
If you want to use a config file to send IR commands you should
try to vary the modulation frequency of the signals. The default
frequency is <NOBR>38000 Hz</NOBR>. It cannot be detected
automatically because the receiver hardware only gives us the
demodulated signals. Using the correct modulation frequency will
increase range significantly. You can set the modulation
frequency for a remote control by adding the line
<PRE>
frequency <freq></PRE>
<P>
to the according section of the config file where <em>freq</em>
stands for the modulation frequency in Hertz. Usually values
from 34000 to 44000 are good choices.
</P>
<P>
As creating new config files is difficult sometimes and irrecord
often cannot detect all features of the remote control please
send new config files to <A
HREF="mailto:lirc@bartelmus.de">lirc@bartelmus.de</A>. Other
people will appreciate this very much. Sometimes they cannot
create such a config file themselves because their original
remote control is broken or has been lost. Some devices that are
capable of IR come without a remote control. Some people also
only want to build a transmitter and if you make a config file
available for them they won't need to build a receiver,
too. Please add all information you can get concerning the
remote control as a comment to the config file.
</P>
<P>
If you still have difficulties to create a working config file
send the following information to <A
HREF="mailto:lirc@bartelmus.de">lirc@bartelmus.de</A>:
</P>
<UL>
<LI>version of LIRC that you are using<BR>
Check if you are using the current version and if there
already is a config file for your remote control.</LI>
<LI>description of your problem</LI>
<LI>config file created by irrecord, if available</LI>
<LI>
output of irrecord in <em>DEBUG mode</em> (you can compile
LIRC in DEBUG mode by selecting this feature in the
<em>Software configuration</em> section of the setup program
or by adding <em>--enable-debug</em> to the configure script
command line)</LI> <LI>output of mode2<BR>
Make sure you hold down some buttons for a while so that
repeat codes will be visible. Do NOT edit this output. Just
send it to me!</LI>
</UL>
<P>
I won't be able to answer any emails that do not contain the
necessary information!
</P>
<!-- +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<CENTER>[<A HREF="http://www.lirc.org/">LIRC homepage</A>]<BR>
<I>The LIRC Manual, last update: 24-May-2009</I></CENTER>
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