[linux-dvb] DVB Front-End Signal Strength Inconsistency

Andrew de Quincey adq_dvb at lidskialf.net
Sun Sep 3 02:11:56 CEST 2006


On Saturday 02 September 2006 19:57, Bradley Kite wrote:
> On 01/09/06, Bradley Kite <bradley.kite at gmail.com> wrote:
> > On 31/08/06, Andrew de Quincey <adq_dvb at lidskialf.net > wrote:
> > > On Thursday 03 August 2006 12:51, Bradley Kite wrote:
> > > > Hi all,
> > > >
> > > > Please find attached a patch which fixes a few of the front-end
> > > > signal-strength functions.
> > > >
> > > > The actual signal strength values returned by some front-ends are not
> > > > consistent
> > > > with others, meaning that it makes it hard for applications to
> > >
> > > interpret
> > >
> > > > this consistently,
> > > > this patch aims to correct this.
> > >
> > > Looking closer, I would agree with the cx22702 fix... however the other
> > > two
> > > (mt352 and cx22700) seem to already be 16 bit values (or close), so I'm
> > > not
> > > sure whether the fixes for those two are valid or not....
> >
> > Hi Andrew,
> >
> > I've just checked these again, and I believe that all three DVB
> > front-ends return 8-bit values, by nature of the fact that the
> > read_register() functions
> > return 8-bit values - but in the mt352 and cx22700 they are indeed stored
> > in 16-bit ints, but they are still only 8-bit.
> >
> > Regards
> > --
> > Brad.
>
> Hi Andrew,
>
> I've just looked even closer this time and can see that the values returned
> from the
> read_register functions are actually shifted any ways - so indeed there's
> no need to fix
> the mt352 and cx22700 front-ends.

Ah yeah, thats what I was thinking.

> Would you like a new patch, or can you just apply the part for the cx22702?

No problems; I can just apply the cx22702 bit by itself.



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