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<H2><A NAME="s8">8.</A> <A HREF="mythtv-HOWTO.html#toc8">Setting up a remote control.</A></H2>
<P>MythTV does not have native remote control receiver and decoder software
built-in. Instead, remote control functions are implemented by cooperating
with <B>lirc</B>, the Linux Infrared Remote Control program. <B>lirc</B>
handles the IR hardware and passes keystrokes to MythTV, which then acts as
if the user had pressed the keys on the keyboard. The file
<CODE>keys.txt</CODE> describes the keys used to control MythTV.</P>
<P>
<FIGURE>
<EPS FILE="warning.eps">
<IMG SRC="warning.png">
<CAPTION><B>NOTE</B>: If you are running Mandriva, you may install
<B>lirc</B> by executing: <CODE># urpmi lirc lirc-remotes</CODE> and bypass
the manual compilation steps described below by jumping to the
<@@ref>completing_lirc_installCompleting the lirc install</A> section.
See the contrib/mandrake91.etc.sysconfig.lircd file for an example of how to
configure lircd.</CAPTION>
</FIGURE>
</P>
<P>Some IR devices require a kernel recompile, and some don't. However, all at
least require having the kernel source available as a resource for the lirc
build process.</P>
<H2><A NAME="ss8.1">8.1</A> <A HREF="mythtv-HOWTO.html#toc8.1">Gentoo</A>
</H2>
<P>To install lirc on Gentoo, all you need to do is:
<BLOCKQUOTE><CODE>
<PRE>
# emerge lirc
</PRE>
</CODE></BLOCKQUOTE>
</P>
<P>The third option is to dispense with lirc altogether by purchasing an IR
keyboard (various options exist, although Chicony appears to work for some
people) and a learning remote control. The IR keyboard receiver plugs into
the PS/2 keyboard port on your PC and you would train your learning remote
to emulate the various keystrokes from <CODE>keys.txt</CODE> of your IR
keyboard. Using this method removes lirc entirely from the picture - your
remote will be sending keypresses that your PC "sees" on the keyboard port.</P>
<P>pulses may correlate to "Channel Up". The <CODE>lircd.conf</CODE> file will
then contain a line that looks something like this:</P>
<P>
<BLOCKQUOTE><CODE>
<PRE>
ChannelUp 0x0000000000001020
</PRE>
</CODE></BLOCKQUOTE>
</P>
<P>The <CODE>lircd.conf</CODE> file can have multiple remote controls defined.</P>
<P>The second file is <CODE>lircrc</CODE>, which takes the name of the button which
was pressed ("ChannelUp") in the above example, and correlates that to an
action to be performed by a program using the remote control. So in MythTV,
ChannelUp means one thing, while in <B>mplayer</B> it means something
different. <CODE>lircrc</CODE> gives you the flexibility of taking the name of
the button and having it perform different actions depending on which
program you're using at the time.</P>
<P><B>NOTE</B>: The definitions in <CODE>lircd.conf</CODE> come from the user
community, and there is no standard for the common button names. One
<CODE>lircd.conf</CODE> file may contain a definition for a button called
"ChannelUp", while another may contain a definition for "Chan+". Your
<CODE>lircrc</CODE> file must therefore be configured appropriately, or it won't
work.</P>
<P>If this fails, complaining of a missing <CODE>lircd.conf</CODE> file, then you
must find or make one. First look for a pre-made configuration file at
<A HREF="http://lirc.sourceforge.net/remotes/">http://lirc.sourceforge.net/remotes/</A>. Mandriva 9.1 users, look in
<CODE>/usr/share/lirc-remotes</CODE>. If you find one your remotes either on the
website or in <CODE>/usr/share</CODE>, download or copy the file, name it
<CODE>lircd.conf</CODE> and put it in your <CODE>/etc</CODE> directory. If you
couldn't find your remote, you must make your own <CODE>lircd.conf</CODE> file.</P>
<P>To make your own <CODE>lircd.conf</CODE> file
<BLOCKQUOTE><CODE>
<PRE>
$ irrecord myremote
</PRE>
</CODE></BLOCKQUOTE>
</P>
<P>Follow the on-screen directions to train your remote and define keys. If
your remote ends up working well, you should consider submitting your
<CODE>lircd.conf</CODE> file back to the lirc developers. Once finished:
<BLOCKQUOTE><CODE>
<PRE>
$ su
# cp myremote /etc/lircd.conf
</PRE>
</CODE></BLOCKQUOTE>
</P>
<P>now try to start lircd again:
<BLOCKQUOTE><CODE>
<PRE>
# /usr/local/sbin/lircd
</PRE>
</CODE></BLOCKQUOTE>
</P>
<P>Now, we're going to add the commands necessary for lircd to run each time we
boot. Mandriva 9.1 users, you can execute:
<BLOCKQUOTE><CODE>
<PRE>
$ su
# chkconfig --level 35 lircd on
# exit
</PRE>
</CODE></BLOCKQUOTE>
</P>
<P>All other distributions:
<BLOCKQUOTE><CODE>
<PRE>
# cd /etc/rc.d
# cat >> rc.local
echo "Starting lircd"
/usr/local/sbin/lircd
^D
# exit
$
</PRE>
</CODE></BLOCKQUOTE>
</P>
<P>This takes care of the lircd portion, which "listens" for the IR signals. If
everything went well, the install script for lircd put an appropriate
configuration file for your remote into <CODE>/etc/lircd.conf</CODE> This file
maps the buttons on the remote control to the IR pulses coming from the
receiver.</P>
<P>The next step is to convert those signals into something that can be used
to control MythTV. MythTV now includes native support for lirc and can
interact directly with</P>
<P>
<BLOCKQUOTE><CODE>
<PRE>
$ cd ~/mythtv-0.22/contrib/configfiles
$ cp lircrc.example ~/.lircrc
</PRE>
</CODE></BLOCKQUOTE>
or
<BLOCKQUOTE><CODE>
<PRE>
$ cp lircrc.example.pinnaclestudiopctv ~/.lircrc
</PRE>
</CODE></BLOCKQUOTE>
if you've got a Pinnacle Studio PCTV remote.
<BLOCKQUOTE><CODE>
<PRE>
$ irw
</PRE>
</CODE></BLOCKQUOTE>
Start pressing the keys on your remote; <B>irw</B> will
print the name of the button as it is defined in your
<CODE>/etc/lircd.conf</CODE>. If you don't see anything at this point, you need
to troubleshoot further by going back to the lirc home page and investigating
from there.</P>
<P>If it is working, then press <B>CTRL-C</B> to abort the program. Once you
know that your remote is working, you can either recompile MythTV with
native lirc support by enabling it in <B>configure</B> or you
need to run the <B>irxevent</B> program, which takes the key presses and
sends them to MythTV. If you use native lirc support, you don't need to run
<B>irxevent</B>. If you are going to use irxevent, then you need to run
it like this:
<BLOCKQUOTE><CODE>
<PRE>
$ irxevent &
</PRE>
</CODE></BLOCKQUOTE>
If <B>irxevent</B> isn't running, then MythTV will not respond to your remote
control unless you're using native lirc support.</P>
<H2><A NAME="ss8.2">8.2</A> <A HREF="mythtv-HOWTO.html#toc8.2">Additional information for lirc</A>
</H2>
<P>Take a look at the lircrc.example files in the <CODE>contrib/configfiles/</CODE>
directory. In my case, (Pinnacle Studio card) the channel up and down functions
weren't working, due to the fact that the button names were different than
the default <CODE>lircrc.example</CODE> file that came with MythTV.</P>
<P>The <CODE>lircrc.example</CODE> file has this:
<BLOCKQUOTE><CODE>
<PRE>
begin
prog = irxevent
button = ChannelUp
config = Key Up CurrentWindow
end
begin
prog = irxevent
button = ChannelDown
config = Key Down CurrentWindow
end
</PRE>
</CODE></BLOCKQUOTE>
but the <CODE>/etc/lircd.conf</CODE> that comes in the lircd package
defines the buttons for the Pinnacle Studio PCTV as:
<BLOCKQUOTE><CODE>
<PRE>
channel+ 0x0000000000000017
channel- 0x000000000000001C
</PRE>
</CODE></BLOCKQUOTE>
rather than "ChannelUp" and "ChannelDown". I added the
following to my /home/[yourusername]/.lircrc file:
<BLOCKQUOTE><CODE>
<PRE>
begin
prog = irxevent
button = channel+
repeat = 3
config = Key Up CurrentWindow
end
begin
prog = irxevent
button = channel-
repeat = 3
config = Key Down CurrentWindow
end
</PRE>
</CODE></BLOCKQUOTE>
which took care of basic functionality. Because the PCTV Studio remote
has additional buttons, look at the
<CODE>contrib/configfiles/lircrc.example.pinnaclestudiopctv</CODE> for an example of how
to define additional buttons, and how to debug potential button name
conflicts between the <CODE>lircrc.example</CODE> file and how <B>your</B>
remote defines the button names.</P>
<P>By examining the button names defined in <CODE>/etc/lircd.conf</CODE> and using
the <B>irw</B> program to make sure that your remote is working, you can
create the appropriate mappings in <CODE>.lircrc</CODE> to get excellent remote
functionality with MythTV.</P>
<P>Note the <B>repeat =</B> parameter. This informs the <CODE>irxevent</CODE>
program to pass through every third keypress. By default, <CODE>lirc</CODE>
will only send one keypress to the application, even if you're holding down
the key. The actual <B>repeat =</B> number will vary from system to
system, so experiment and see which value works best for you.</P>
<H2><A NAME="ss8.3">8.3</A> <A HREF="mythtv-HOWTO.html#toc8.3">Configuring lirc for use with an IR blaster</A>
</H2>
<P>Lirc has support for various IR transmitters. A popular model is the Actisys
IR-200L
<A HREF="http://store.snapstreamstore.com/accessories.html">http://store.snapstreamstore.com/accessories.html</A>. It was
originally designed for IRDA communication, but can be used to transmit A/V remote
control codes. By using the lirc SIR driver, this device can easily be
integrated with MythTV. I have tested this device with an AT&T DCT2000
digital cable box but the instructions can be used to configure other IRDA
devices and A/V remotes.</P>
<P>Follow the steps in the previous section. When you run setup.sh, select
option 1, driver configuration. From here select option 6, IrDA hardware.
Select your appropriate device and the corresponding serial port, then Save
configuration & run configure from the main menu. Once configure is done
type:
<BLOCKQUOTE><CODE>
<PRE>
$ make
</PRE>
</CODE></BLOCKQUOTE>
</P>
<P>Please note: unlike the Pinnacle receiver above you will be compiling lircd
in addition to a kernel module for the SIR transmitter. Depending on whether
you have your serial port driver configured as a kernel module you might see
the following message during make:
<BLOCKQUOTE><CODE>
<PRE>
lirc_sir.c:56:2: warning: #warning
"******************************************"
lirc_sir.c:57:2: warning: #warning "Your serial port driver is compiled into "
lirc_sir.c:58:2: warning: #warning "the kernel. You will have to release the "
lirc_sir.c:59:2: warning: #warning "port you want to use for LIRC with:"
lirc_sir.c:60:2: warning: #warning "setserial /dev/ttySx uart none"
lirc_sir.c:61:2: warning: #warning
"******************************************"
</PRE>
</CODE></BLOCKQUOTE>
</P>
<P>If you do receive this statement make sure to run the <B>setserial</B> command
before you load the lirc_sir module. Follow this with the install:
<BLOCKQUOTE><CODE>
<PRE>
$ su
# make install
</PRE>
</CODE></BLOCKQUOTE>
</P>
<P>You will notice that lirc installs the kernel module in
<CODE>/lib/modules/uname -a/misc</CODE>.</P>
<P>The configuration for starting <B>lircd</B> differs if you're going to be
sending and receiving IR versus just receiving.
<BLOCKQUOTE><CODE>
<PRE>
# cd /etc/rc.d
# cat >> rc.local
echo "Starting lircd"
setserial /dev/ttySx uart none # (if required)
modprobe lirc_sir
/usr/local/sbin/lircd
^D
# exit
$
</PRE>
</CODE></BLOCKQUOTE>
</P>
<P>At this point you have to populate the <CODE>/etc/lircd.conf</CODE> file with the proper
codes for your A/V remote. You should be able to find your remote within the
lirc remote tar file located at
<A HREF="http://www.lirc.org/remotes.tar.bz2">http://www.lirc.org/remotes.tar.bz2</A>. In my case I
extracted the file from remotes/motorola/DCT2000 (gi-motorola-dct2000)</P>
<P>To test the lirc_sir module you can run <B>irw</B> to verify the codes are being
received. If everything is configured correctly
you should see something similar to the following:
<BLOCKQUOTE><CODE>
<PRE>
$ irw
0000000000007ff0 00 1 gi-motorola-dct2000
000000000000bff8 00 2 gi-motorola-dct2000
000000000000f7f0 00 ENTER gi-motorola-dct2000
</PRE>
</CODE></BLOCKQUOTE>
</P>
<P>Once you've verified lirc is working you can press <B>CTRL-C</B> to exit
<B>irw</B> and configure the channel changing script.</P>
<P>The path to the channel changing script will need to be entered on the
mythtv-setup screen for Input Connections.</P>
<P>This csh script will be called each time MythTV needs to change the channel.
Below is a copy of the script followed by the corresponding perl script.
Make sure both are in your path. Also make sure you leave the #!/bin/csh
setting and not change it to Bourne or bash. This will create a frustrating
symptom to diagnose where MythTV cannot open /dev/device. Unlike Bourne or
bash, csh scripts automatically close parent file descriptors before they
start.
<BLOCKQUOTE><CODE>
<PRE>
$ cd /usr/local/bin
# su
# cat > change_channel.csh
#!/bin/csh
echo "changing to $1"
/usr/local/bin/channel.pl $1 &
^D
# chmod a+x change_channel.csh
# exit
$ exit
</PRE>
</CODE></BLOCKQUOTE>
</P>
<P>See <CODE>contrib/channel.pl</CODE> for the actual file. Copy it to
<CODE>/usr/local/bin/</CODE></P>
<P>The last statement within the perl script is the lirc rc command. This is
the command that transmits the code to your cable/DSS box. Make sure to have
the IRDA device within a few feet of the box.</P>
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