[linux-dvb] Re: Skystar2 rev2.6B working... almost

[Holger Waechtler <holger@convergence.de>]

Niklas Peinecke wrote:
> Hi all,
>
> I'm working on a driver for the new Technisat Skystar2 rev2.6B (also 
> known as 2.68). It's got a different tuner than the old revision (a 
> Samsung TBMU24112IMB1 with a STV0299 and a SL1935).
> Basically I fixed a bug in skystar2.o concerning i2c-handling and put it 
> together with the stv0299 driver and the sl1935 tuning routine from the 
> mt312 driver, then I get a signal and a carrier from the card, but no 
> viterbi (signal too low) and no sync.
> I doubt that it's got something to do with the clock settings, but I 
> haven't done any hardware programming since 1990.
>
> Two guestions:
> * Should I modify the master clock setting? M_CLK is 88 Mhz, but 
> according to the specs I would rather say the stv0299 is set to 22 Mhz??
> * What should the pll clock setting in the sl1935 tuning routine be? 
> Currently I just left it at 10 Mhz, but I doubt it should be different.
Both clocks need to get set according to the crystals soldered on the 
card, so you need to check which type is used and then adjust the values 
appropriatly.

If you want to get an idea what exactly is causing your problem you 
could log the i2c commands issued by the Windows driver using a i2c 
sniffer like milk/cheapi2c (http://warmcat.com/milksop/), then you can 
set first the PLL/Synthesizer and then the demod to known working values.

Holger



--
Info:
To unsubscribe send a mail to ecartis@linuxtv.org with "unsubscribe linux-dvb" as subject.