[linux-dvb] Re: Frontend experimental patch v1

[a.share@t-online.de (Andreas Share)]

> Am Friday 05 March 2004 19:28 schrieb Andreas Share:
> > > > I have done some more tests arount crl_bit() in ves1x93 with my Rev
1.3
> > > > DVB-S (ves1893). Realy only one "soft reset" is needed for this
demod
> <snip>
>
> Maybe it's slightly off topic, but i'am currently doing some research what
> changed between 0.9.4 and current drivers (beside firmware).

Hi, i doing the same;)

> For now i found just, that
>
> static u8 init_1893_tab [] = {
> 0x01, 0xa4, 0x35, 0x81, 0x2a, 0x0d, 0x55, 0xc4,
> 0x09, 0x69, 0x00, 0x86, 0x4c, 0x28, 0x7f, 0x00,
> 0x00, 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> --- 0x80, 0x00, 0x31, 0xb0, 0x14, 0x00, 0xdc, 0x20,
> +++ 0x80, 0x00, 0x31, 0xb0, 0x14, 0x00, 0xdc, 0x00,
> 0x81, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> 0x00, 0x55, 0x00, 0x00, 0x7f, 0x00
> };
>
> changed at one parameter - what are these all for?

This are default values for the internal ves1893 demod register. In this
case register 0x1f was changed. The first 4 bit must be set to zero fro this
register, and the next three will control output control pinīs. In this case
polarisation will be switched with this register. The old default was 13V
LNB Power, the new one 0V (or LNB off) at startup .

Andreas

> Why does a DVB-S need to load the module ves1x93 even if just replay is
> requested (otherwise we get instantly and endless ARM-crashes),
> whereas a DVB-T can do without a frontend?



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