[linux-dvb] [vdr] stb0899 and tt s2-3200

Ales Jurik ajurik at quick.cz
Thu Oct 9 15:07:50 CEST 2008


On Thursday 09 of October 2008, Goga777 wrote:
> > > it's not working with SR 30000 FEC 3/4 dvb-s2 8PSK, still the same
> > > problem.
> > >
> > > kind regards
> > >
> > > Newsy
> >
> > It seems that patch from
> > http://www.linuxtv.org/pipermail/linux-dvb/2008-July/027264.html is not
> > applied. The internal PLL must be disabled when setting new frequency as
> > is written in stb6100 documentation.
>
> has your July-patch any relation with stb0899 patches from Alex Betis ?
>
> http://www.linuxtv.org/pipermail/linux-dvb/2008-October/029455.html
> http://www.linuxtv.org/pipermail/linux-dvb/2008-September/029361.html
>
> Goga

I don't think so as Alex's patches are for demodulator (stb0899) but my was 
for tuner (stb6100). 

Regarding stb6100 doc the tuning procedure should be:
1. Disable PLL (LPEN_LPEN)
2. Set-up the tuner
3. Start PLL
4. Start VCO search
5. Wait for 5 ms
6. Disable VCO search, turn off VCO search clock and disable LPF BW clock

The steps 1-5 should be done in 5 steps (not less) and as I remeber I've got 
better result when inserting small delay between steps 1 and 2 and the delay 
from step 5 was set to 10ms. In stb6100.c are steps 1 and 2 done together 
within 1 write to stb6100 registers and this seems to be not optimal for some 
modulations.

Regards,

Ales



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