[linux-dvb] Re: VDR: Tuning stability

[Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>]

Ralph Metzler wrote:
> 
> Klaus Schmidinger writes:
>  > In order to make channel tuning more stable I have extracted
>  > the code that VDR uses to change channels and made a small
>  > test example that does nothing else but switching channels
>  > (so basicly it does some "heavy zapping").
>  >
>  > The file can be found at
>  >
>  >   ftp://ftp.cadsoft.de/pub/people/kls/ctest.c
>  > [...]
> 
> OK, I tested the following:
> 
> - start ctest until it starts with "channel not sync'ed!"
> 
> - exit ctest
> 
> - start ntuxzap, tuning works fine
> 
> - exit ntuxzap
> 
> - start ctest, I immediately get "channel not sync'ed!"
> 
> - exit ctest
> 
> - start ntuxzap, tuning works fine
> 
> ...
> 
> I did not get any outcommand errors yet. They are usually caused by
> a crash of the TPP (transport packet parser) hardware in the AV7110
> caused by "bad tuning". I'll have to do more debugging to see if this
> is the reason or if some bug in the firmware causes it.
> 
> In any case, the "channel not sync'ed!" errors seem to be an error
> either in the higher level driver parts (QPSK/QAM event queue
> handling) or the application. I'll have to take a closer look first.

I have uploaded a new version of ctest.c that incorporates Marcus' suggestion
about polling the frontend until the tuner is ready. However, this didn't
cure the problems...

Klaus
-- 
_______________________________________________________________

Klaus Schmidinger                       Phone: +49-8635-6989-10
CadSoft Computer GmbH                   Fax:   +49-8635-6989-40
Hofmark 2                               Email:   kls@cadsoft.de
D-84568 Pleiskirchen, Germany           URL:     www.cadsoft.de
_______________________________________________________________


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