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Wednesday, 18 December 2013

Customizing your Raspberry Pi remote [day 7 of 20-days-of-posts series]

Yesterday I discussed how you could install an IR receiver on the Raspberry Pi so that you could use an IR remote to navigate XBMC.

Today I dig a little deeper into the configuration, settings and customization.

I assume your IR receiver is working (as described in the previous post).    We continue where we left off...


To create a configuration for a given remote, run the following:

  1. sudo /etc/init.d/lirc stop
  2. sudo irrecord -d /dev/lirc0 ~/lircd.conf
As part of generating lirc.conf, you'll be asked to enter a key name and then press that button on the remote so that it can read the IR signal and associate with that key.

To see a list of keynames, run irrecord --list-namespace .  Some very common ones are:

         KEY_HOME
         KEY_BACK   
         KEY_SELECT
         KEY_LEFT
         KEY_RIGHT
         KEY_UP    
         KEY_DOWN   
         KEY_REFRESH  
         KEY_FASTFORWARD     
         KEY_REWIND  
         KEY_PLAYPAUSE 
         KEY_INFO        

When prompted for a key name, you would enter something like KEY_HOME and then press the HOME key on the remote.  This would capture that input and the IR code associated with the key.  If you use an invalid key name or need to change it, you can do so by modifying the generated output (in this case,  ~/lirc.conf).

For a sample remote, I used a Western Digital TV (WD TV) player that I no longer use. and the generated output of that remote is as follows:
(download lircd.conf)
# Please make this file available to others
# by sending it to <lirc@bartelmus.de>
#
# this config file was automatically generated
# using lirc-0.9.0-pre1(default) on Sat Apr 13 23:25:54 2013
#
# contributed by
#
# brand:                       /home/pi/lircd.conf
# model no. of remote control:
# devices being controlled by this remote:
#
begin remote
  name  /home/pi/lircd.conf
  bits           16
  flags SPACE_ENC|CONST_LENGTH
  eps            30
  aeps          100
  header       8935  4503
  one           520  1709
  zero          520   606
  ptrail        524
  repeat       8935  2275
  pre_data_bits   16
  pre_data       0x219E
  gap          108035
  toggle_bit_mask 0x0
      begin codes
          KEY_BACK                 0xD827
          KEY_BOOKMARKS            0xF00F
          KEY_DOWN                 0x00FF
          KEY_ENTER                0x10EF
          KEY_FASTFORWARD          0x7887
          KEY_FAVORITES            0x08F7
#          KEY_FORWARD              0x7887
          KEY_HOME                 0x609F
          KEY_INFO                 0x58A7
          KEY_MENU                 0x58A7
          KEY_LEFT                 0xE01F
          KEY_NEXT                 0x807F
          KEY_PLAYPAUSE            0x50AF
          KEY_POWER                0x48B7
          KEY_PREVIOUS             0x40BF
          KEY_REWIND               0xF807
          KEY_RIGHT                0x906F
          KEY_STOP                 0x20DF
          KEY_UP                   0xA05F
      end codes
end remote
If you have a Logitech Harmony remote, life is even easier.  You can select almost any media player remote, push the settings to your Harmony remote, and then capture they keypresses like described in the above.  If you want to cheat, you could search for the remote setting for "WD TV" and then skip capturing the codes and just copy-and-paste the above lircd.conf as your own.  

If you didn't generate the lirc.conf in the correct location, or if you are copying it from a difference source, make sure you store it in /home/pi/ on your Raspberry Pi.

All you need to do now, is in Raspbmc Settings (under Programs), use the settings Enable Repeat Filter (enable/fill in dot), Enable GPIO TSOP IR Receiver (enable/fill in dot), GPIO IR Remote Profile select Custom (lircd.conf on pi's home folder).

Then either restart XBMC (you can kill -9 on the xbmc.bin process in a ssh session) or reboot the Pi, and once the Lirc service starts in XBMC, your remote should control XBMC.

We don't have to stop here.  We can further move onto some customization.

It might be handy, for instance, to associate a remote key to a function.  For example, there is no key set that would allow us to quickly access the Favourites Menu.  In actuality, we can associate almost any function in XBMC to a key on a remote (likewise can be done for keyboard, mice, and joysticks).

We can repurpose an existing key, such as KEY_HOME, which we will use for this example.  If you have a Harmony remote, you could create virtual keys fairly easy that would appear in the activity screen on the remote.  The "WD TV" device in Harmony actually contains a few such keys such as A, B and C.  You can look up any unusued key name in the keymap (running the irrecord --list-namespace that was ran earlier), and associate the IR signal to the key name and add it to your lircd.conf.  For simplicity, this example will simply repurpose the KEY_HOME.

On the Raspberry Pi, I will create a file /home/pi/.xbmc/userdata/Lircmap.xml .  I add the following entries to that file:
(download Lircmap.xml)

<lircmap>
 <remote device="devinput">    
<back>KEY_BACK</back>
<up>KEY_UP</up>
   <left>KEY_LEFT</left>
   <select>KEY_SELECT</select>    
<right>KEY_RIGHT</right>
   <down>KEY_DOWN</down>
   <stop>KEY_STOP</stop>
   <info>KEY_INFO</info>
   <skipminus>KEY_REWIND</skipminus>
   <play>KEY_PLAYPAUSE</play>
   <skipplus>KEY_FASTFORWARD</skipplus>
   <menu>KEY_HOME</menu>
 </remote>
</lircmap>
In  Lircmap.xml, I am associating my key names to functions in XBMC.  You can look up all the available function names from http://wiki.xbmc.org/index.php?title=keymap .  It appears they are case-insensitive (Play = play).  I can associate the keys to explicit functions.  Because you are using KEY_* names that are actually valid and common, these are mapped to their appropriate functions in XBMC by default.  Therefore, you could have stopped and not created this file, and still be able to use the keys to invoke common functions in XBMC.  You only have to create this file and start mapping keys once you have decided to reprogram their functions.  You can select any available function name (you cannot make up your own, but you can select an existing name and repurpose it).  We will select an unused <menu></menu> and associate the KEY_HOME to it as in <menu>KEY_HOME</menu>.

Finally, on the Raspberry Pi, I will create a file /home/pi/.xbmc/userdata/keymaps/remote.xml .  I add the following entries to that file:
(download remote.xml)


<keymap>
 <global>   
<remote>      
<menu>XBMC.ActivateWindow(Favourites)</menu>   
</remote> 
</global>
</keymap>
I invoke the XMBC.ActiveWindow function and pass it Favourites to open the favourites.xml in a Favourties menu.  There are a number of windows that can be opened to common function.  There are also a number of different functions that can be called.  Favourites does exist in XBMC (it is actually a Window ID type that automatically loads whatever is listed in favourites.xml).  There are also a bunch of different window IDs that you can do the same action on.  You could literally have a 400 key remote and still not have enough keys to satisfy all the functions and windows to call upon.

At this point, with the menu defined to the KEY_HOME in the Lircmap.xml and the menu defined with our custom action to open the Favourites Window in  remote.xml, we can either restart XBMC (you can kill -9 on the xbmc.bin process in a ssh session) or reboot the Pi, and once the Lirc service starts in XBMC, your custom key should perform the action of opening the Favourites menu.

The last time I have is troubleshooting.  If a key doesn't appear to be performing correctly or if you don't believe you've mapped it correctly, while in XBMC on the Raspberry Pi, ssh into the system and run irw. When you press keys on your remote to XBMC, the actions and key names invoked should appear in the ssh session.  This will quickly help identify the key name associated with the key.  If you press a key and it doesn't appear in the session, it means you haven't mapped it in the lircd.conf.  

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