[mythtv-users] Getting lirc working

Angus sylvania at istop.com
Sat Mar 17 15:52:10 UTC 2007


Jon wrote:
> Angus wrote:
>   
>> Jon wrote:
>>     
>>> Angus wrote:
>>>   
>>>       
>>>> Jon wrote:
>>>>     
>>>>         
>>>>> Angus wrote:
>>>>>   
>>>>>       
>>>>>           
>>>>>> Jon wrote:
>>>>>>     
>>>>>>         
>>>>>>             
>>>>>>> Angus wrote:
>>>>>>>   
>>>>>>>       
>>>>>>>           
>>>>>>>               
>>>>>>>> Jon wrote:
>>>>>>>>     
>>>>>>>>         
>>>>>>>>             
>>>>>>>>                 
>>>>>>>>> It sounds like your remote does not repeat keypresses.  Does it have a
>>>>>>>>> LED?  If so, does it continue flashing as you hold the button down?  If
>>>>>>>>> not you can use a digital camera pointed at the ir transmitter to confirm.
>>>>>>>>>   
>>>>>>>>>       
>>>>>>>>>           
>>>>>>>>>               
>>>>>>>>>                   
>>>>>>>>     Digital camera, eh?
>>>>>>>>     
>>>>>>>>         
>>>>>>>>             
>>>>>>>>                 
>>>>>>> Digital cameras are sensitive to IR light.
>>>>>>>   
>>>>>>>       
>>>>>>>           
>>>>>>>               
>>>>>>>>     Well, as an addendum, after pushing several keys for a while out of 
>>>>>>>> frustration, it finally registered a "gap". So I went through the 
>>>>>>>> process of testing every key, and you can imagine my frustration when I 
>>>>>>>> finished and found every key was coded as 0x0. Here's the less 
>>>>>>>> vacuous-looking part of the config file:
>>>>>>>> bits            0
>>>>>>>>  eps            30
>>>>>>>>  aeps          100
>>>>>>>>
>>>>>>>>  one             0     0
>>>>>>>>  zero            0     0
>>>>>>>>  pre_data_bits   32
>>>>>>>>  pre_data       0x800100A7
>>>>>>>>  gap          339993
>>>>>>>>  toggle_bit      0
>>>>>>>>
>>>>>>>> Now what do I try?
>>>>>>>>     
>>>>>>>>         
>>>>>>>>             
>>>>>>>>                 
>>>>>>> Have you read http://www.linuxtv.org/v4lwiki/index.php/Remote_controllers
>>>>>>>   
>>>>>>>       
>>>>>>>           
>>>>>>>               
>>>>>>     Yes, I have.
>>>>>>
>>>>>>     
>>>>>>         
>>>>>>             
>>>>>>> Specifically,
>>>>>>> saa7134: Most cards need only the saa7134 driver, but a few need the
>>>>>>> ir-kbd-i2c helper. Boards known to require ir-kbd-i2c include the Upmost
>>>>>>> Purple TV and the latest "i-series" Pinnacle PCTV boards (110i, 50i)
>>>>>>>   
>>>>>>>       
>>>>>>>           
>>>>>>>               
>>>>>>     And I've been asking what that means over at v4l, but I haven't 
>>>>>> gotten any response.
>>>>>>     
>>>>>>         
>>>>>>             
>>>>> It means you may need to modprobe ir-kdc-i2c before it will work.  You
>>>>>   
>>>>>       
>>>>>           
>>>>     Ah, yes. But that module loads automatically with saa7134. 
>>>> http://www.mythtv.org/wiki/index.php/KWorld_Global_TV_Terminator#Remote 
>>>> also says that I might need a patch for that, which is apparently got 
>>>> something to do with v4l, but I can't been able to get anyone there to 
>>>> help me with that yet.
>>>>
>>>>     
>>>>         
>>>>> might see if you can use the linux input interface instead of lirc.
>>>>> Open xev and press a few buttons on the remote to see if they register.
>>>>>   
>>>>>       
>>>>>           
>>>>     I did, and the results were not remarkable. Anything I pressed 
>>>> returned this:
>>>> KeyPress event, serial 28, synthetic NO, window 0x1e00001,
>>>>     root 0x45, subw 0x0, time 959597, (-218,-78), root:(400,300),
>>>>     state 0x0, keycode 177 (keysym 0x0, NoSymbol), same_screen YES,
>>>>     XLookupString gives 0 bytes:
>>>>     XmbLookupString gives 0 bytes:
>>>>     XFilterEvent returns: False
>>>>
>>>> KeyRelease event, serial 31, synthetic NO, window 0x1e00001,
>>>>     root 0x45, subw 0x0, time 959645, (-218,-78), root:(400,300),
>>>>     state 0x0, keycode 177 (keysym 0x0, NoSymbol), same_screen YES,
>>>>     XLookupString gives 0 bytes:
>>>>     XFilterEvent returns: False
>>>>
>>>> Except for the "time" field, this is exactly what was returned with 
>>>> every key I pressed. I get the feeling that means it isn't working here 
>>>> either.
>>>>
>>>>     
>>>>         
>>> I suspect your remote is not supported by the driver yet.  If you are
>>> feeling adventurous, see the section titled "How to add remote control
>>> support to a card" at the url above.  I once added support for a cx88
>>> based card before, it's not very difficult.
>>>   
>>>       
>>     Which URL? 
>> http://www.linuxtv.org/v4lwiki/index.php/Remote_controllers? It seems to 
>> be only for "GPIO" remotes. How would I know if mine is "GPIO" and not 
>> "C3PIO" for instance?
>>     
> Per the article: Sometimes remotes are not pure gpio and acts a bit
> differently. For example, keypress can be signalled by gpio and keyvalue
> can be read from i2c device. If you seen only 1 bit is changing in gpio
> once it's probably this situation.
>
>   
>>     Also, what makes you think I know any C? 
>>     
> Nothing, I can do hello world in C and that is it.  I basically found
> the remote definitions in my driver, cloned one and played with the gpio
> mask until I got different vaules for each key just like it says.  It
> was a bit daunting at first.  The first time I looked through it I just
> said screw it, but I came back to it a few months later and it worked on
> about the third try.
>
> Actually, I know a great
>   
>> deal of C. But all the C-knowledge in the world can't help me understand 
>> those instructions. Are there better ones anywhere?
>>     
> Assuming your card is correctly auto detected and you are not passing
> card=x to the driver, just find the case statement it is referring to.
> Note the remote that is bound to it.  Find the remote definition, change
> mask_keycode to 0. Proceed from step 3.
>   

    Ah, could this be the problem? My card is *not* autodetected, and I 
do have to pass card=x. Here's my /etc/modprobe.d/saa7134:
options saa7134 i2c_scan=1 card=65 tuner=54
If remove this file, then the card doesn't work at all


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