[linux-dvb] [PATCH] TRL nominal rate implementation

Antti Palosaari crope at iki.fi
Fri Jan 26 00:19:05 CET 2007


heis!
Same patch as earlier, but now with fixed nominal rate calculation.
Still I don't have any idea why real xtal freq differs from freq used in 
code. Interesting enough, the difference between real and software 
frequency is just 2048 (kHz) :)

It could be interesting to see what are used values in case of different 
xtal. Does someone have a stick with zl10353 demod and different xtal?

Tested successfully with au6610 & gl861 against fi-Oulu frequencies.

Signed-off-by: Antti Palosaari <crope at iki.fi>

Regards Antti Palosaari

Antti Palosaari wrote:
> heippa!
> Implement trl nominal rate calculation to Zarlink ZL10353 demod. Patch 
> is based on calculation used in Zarlink MT352 which seems to be very 
> similar.
> 
> There seems to be a little difference in calculation that I haven't 
> found yet. Using bandwidth 7 it gives rate 0x5ae8 instead of 0x5ae9 
> which have seen in logs sniffed from windows driver. I assume that this 
> small difference does not have any effect.
> 
> The other thing I don't understand is xtal used in hardware is 20.480 
> MHz, but in code it needs to be set 22528. Does anyone know why the 
> difference?
> 
> With those two "findings" I assume that there is still a slight 
> calculation error. I did simple openoffice spreadsheet to calculate 
> nominal rate, try it and find correct formula :)
> http://otit.fi/~crope/v4l-dvb/zl10353/zl10535_trl_nominal_rate_calculator.ods 
> 
> 
> Signed-off-by: Antti Palosaari <crope at iki.fi>
> 
> Regards Antti Palosaari
> 
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