[linux-dvb] Re: dvb-kernel/stv0299 cvs >20040224

[Kenneth Aafløy <ke-aa@frisurf.no>]

On Sunday 14 March 2004 03:24, you wrote:
> On Saturday 13 March 2004 17:57, Kenneth Aafløy wrote:
> > On Saturday 13 March 2004 16:08, Andrew de Quincey wrote:
> > > On Saturday 13 March 2004 14:59, Kenneth Aafløy wrote:
> > > > On Saturday 13 March 2004 13:45, Andrew de Quincey wrote:
> > > > > Well, in all my tests, I've tried INVERSION_OFF, INVERSION_ON, and
> > > > > INVERSION_AUTO. INVERSION_OFF/INVERSION_ON are passed directly
> > > > > through to the driver, and work as expected for me. INVERSION_AUTO
> > > > > works fine as well. And I've had no other complaints about
> > > > > inversion.
> > > > >
> > > > > Previously the code flipped the inversion on every tune step
> > > > > attempt, so you could have specified absolutely anything, and it
> > > > > would have worked on high symbol rate channels. This, as I said,
> > > > > broke low symbol rate channels (for me at least) as they're far
> > > > > more sensitive.
> > > >
> > > > So what i'm trying to tell you is that INVERSION_OFF won't work for
> > > > me, but INVERSION_AUTO and INVERSION_ON do,
> > >
> > > I _think_ so.
> > >
> > > > this is on Thor 1W with a Nexus-S
> > > > (STV0299, tuner BSRU6, TDQB-S00x). So is Thor 1W using inversion, and
> > > > thus i should just stop naging about this, or?
> > >
> > > Hmm, I dunno, I don't have access to that satellite. However, on
> > > hotbird, most channels don't use inversion, except for one (EDTV) which
> > > does for some reason.
> > >
> > > I assume Thor must be using inversion, or some part of your equipment
> > > requires it.
> > >
> > > Don't worry about asking! Otherwise bugs will get missed.
> >
> > I loaded up the 20040224 cvs drivers and did a quick mod to myth to print
> > the returned frontend params from fe_get_frontend, and that reports
> > inversion off
>
> There is one other possibility, which I must apologise for forgetting about
> until now. The ALPS BSRU6 frontend might need to have the sense of
> inversion inverted.. some frontends do (eg. TDA10046).
>
> Looking at the docs closely, this seems likely; it says I should set the
> value to 0 for INVERSION_ON, and 1 for INVERSION_OFF.
>
> This is the opposite of the settings required for the su1278-tua5059 tuner.
>
> My apologies for not thinking of this before.

Thanks alot for tracking down the real cause of this, Andrew.

-- 

Kenneth
ke-aa@frisurf.no


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