[linux-dvb] stv0299: explanation of 08 and 0c registers [rev 2.3]

Johannes Stezenbach js at linuxtv.org
Tue Jul 19 22:50:45 CEST 2005


Jeremy Hall wrote:
> I am looking at some code that attempts to change the voltage within 8ms.  I recently swapped 
> out my legacy dvb/s card for one of these 2.3 cards which I understand has a different tuner 
> on it, although it is integrated into the stv0299 driver.
> 
> Could someone point me to a document or explain to me how the 0x08 and 0x0c registers work? 
> The tuner is definitely the newer model, as when the vertical polarity is set, the mask is 
> 0x10, not 0x40 as in legacy tuners.  I am getting sporatic responses and am thinking that 
> somehow we're not quite getting it right, and maybe a subsequent retransmission of a command 
> clears up the problem.

The registers are described in the stv0299 data sheet, but that
alone doesn't help you because you need to know the circuit around
the stv0299 to set them. This should be specifed in the frontend
(tin box) data sheet.

Johannes




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