[linux-dvb] Re: Full featured card summary

[Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>]

Holger Waechtler wrote:
> 
> On Sunday 14 March 2004 23:45, Klaus Schmidinger wrote:
> > Holger Waechtler wrote:
> > >
> > > 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.
> >
> > With the DVB driver I am able to use a VDR DiSEqC setup like
> >
> > S19.2E  11700 V  9750  [E0 10 38 F0] W100 [E0 10 38 F0]
> > S19.2E  99999 V 10600  [E0 10 38 F1] W100 [E0 10 38 F1]
> > S19.2E  11700 H  9750  [E0 10 38 F2] W100 [E0 10 38 F2]
> > S19.2E  99999 H 10600  [E0 10 38 F3] W100 [E0 10 38 F3]
> >
> > here the sequence [E0 10 38 F0] is sent, followed by a 100ms wait,
> > and then [E0 10 38 F0] is repeated because the multiswitch is behind
> > a DiSEqC relay. There's no need for explicit tone or voltage switching
> > here. So I would say that activating the power supply to the LNB should
> > be done automatically when the frontend is opened.
> >
> > As a workaround in VDR 1.3.6 I have added a call to
> >
> >   ioctl(fd_frontend, FE_SET_VOLTAGE, SEC_VOLTAGE_13)
> >
> > when opening the device, but I think this shouldn't be necessary.
> 
> The DiSEqC spec requires you to set the appropriate bus voltage before a
> DiSEqC command is sent. It also requires that the old-style SEC and DiSEqC
> commands are sent compatibly, the behaviour of switches, rotors and LNBs is
> not defined if the content of SEC and DiSEqC sequence don't match. The SEC
> sequence is mandatory (Voltage, tone and burst). See the DiSEqC Update and
> Recommendations for Implementations on the Eutelsat website:
> http://www.eutelsat.org/satellites/pdf/Diseqc/associated
> docs/update_recomm_for_implim.pdf, page 36.
> 
> Also check out dvb-apps/test/diseqc.c for a reference implementation.

But my DiSEqC equipment _does_ work fine with the DVB driver and sending
plain hex codes (like [E0 10 38 F3]). The LNB power issue has been resolved
by explicitly turning it on in VDR, so I would expect the DiSEqC equipment
to work with dvb-kernel - but it doesn't (at least not reliably)

Klaus


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