[linux-dvb] Re: Diseqc and skystar2.

["Augusto Cardoso" <augusto@carhil.net>]

Hi!

The reason why the Skystar2 - 2.3 boards don't use the VP310(MT312) for diseq is because in Japan they use a different system for switching LNB. They use 33Khz and 44Khz. FCII generates these signals, but not the diseq commands. They also use different voltages, which is easy to do.
It's a bad solution for diseq, but it was the best compromise at that time. (1998/1999).

I heard that there are some other "budget" cards that need software diseq as well.

The 2.6, 3.X and the USB use the demod to generate diseq commands. But they use the STV0299, which doesn't do a great job at that either.

	Augusto

*********** REPLY SEPARATOR  ***********

On 12/1/2003 at 12:05 PM Vincenzo Di Massa wrote:

>Il lun, 2003-12-01 alle 08:35, Holger Waechtler ha scritto:
>> Vincenzo Di Massa wrote:
>> > I was asked to try a go for full diseqc on the skystar2.
>> > 
>> > My question is: should I:
>> > 
>> > 1) Only add code to the actual driver, to let it send arbitrary bytes
>in
>> > diseqc style?
>> > 2) Remove everything from skystar2.c and place it in a different file
>> > (diseqc_emulator.c ?) allowing other drivers too to register their
>> > functions (tone on/off)?
>> 
>> Isn't the MT312 on the Skystar2 able to generate DiSEqC signals?
>
>MT312 has the ability to send diseqc commands. But skystar2 does not use
>it, it sends 22k (diseqc messages too) using the FC.
>This is why I posted the tone burst patch: you can issue commands to
>mt312 on the skystar2, but the chip is not wired to the antenna cable.
>
>All this was told me by the author of the mt312 module (Andreas
>Oberritter).
>Read the following mail:
><Mail>
>On Sat, 2003-11-08 at 04:56, Vincenzo Di Massa wrote:
>> I have seen that skystar2.c driver uses its own routines to set up
>> voltage and tone. Why doesn't it call mt312 routines? Should
>skystar2.c
>> manage tone burst in a custom way?
>
>Yes. I wrote the driver for an mt312 evaluation board. That's why I
>implemented the "unused" diseqc functions. The skystar card uses its
>predecessor, the vp310, which is almost completely compatible. Up to
>revision 2.3 of the card, diseqc and tone burst signals are generated by
>the flexcop. Revision 2.6 and newer use the frontend for that, but they
>don't have an mt312 compatible chip. They are based on the stv0299.
>Unfortunately the only way to get information about how the flexcop
>works is to disassemble binary drivers.
>
>Regards,
>Andreas
></Mail>
>
>
>> 
>> Holger
>> 
>-- 
>Vincenzo Di Massa <hawk78_it@yahoo.it>
>
>
>
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