[linux-dvb] Re: Full featured card summary

[Holger Waechtler <holger@qanu.de>]

On Sunday 14 March 2004 23:35, Andrew de Quincey wrote:
> >
> > If you specify a bus voltage of 13 or 18V you definitely don't mean
> > VOLTAGE_OFF but expect the LNBP working, everything else is a bug.
>
> Yeah, it seemed to have changed from being set to VOLTAGE_13 in the
> initialisation tables to being set to VOLTAGE_OFF by default... somewhere
> between the 1.0.1 and the 1.1.0 release.
>
> Defaulting to VOLTAGE_OFF makes sense though; no point powering up the LNB
> until its actually needed. What do you think of Johannes' idea of it auto
> powering up on frontend open?

makes not really sense -- you can't really tune a LNB wothout setting up 
polarisation plane and the band selection switch before, can't you?

As soon you submit the polarisation selection command (VOLTAGE_13V or 
VOLTAGE_18V) you already powered up the LNB. The only important thing is to 
maintain the delay times required by the spec, the diseqc.c example shows how 
this can get implemented.

Holger


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