[linux-dvb] [Patch] FMD1216 band updates and control bytes
js at linuxtv.org
Tue Nov 29 02:36:25 CET 2005
On Tue, Nov 29, 2005, Hartmut Hackmann wrote:
> Steve Toth wrote:
> >I went through the FMD1216 datasheet and updated the FMD PLL bands based
> >on the official document. The current values differ from the datasheet.
> >The existing dvb-pll.c values appear to work fine for the HVR1100, and
> >also work fine for many of the existing FMD tuner products so I don't
> >know whether this patch will be accepted or not. Some of the existing
> >bands are out (just a little) so tuning problems with the current values
> >may not be completely obvious. The current values are close, but not
> Hm, the data sheet of the FMD2116ME MK3 is - lets say - a problem.
> One issue is the DVB-T IF frequency. I got told it is 36.125MHz but
> this can't be right. The tuner can't tune to this frequency, it should
> be 36.167MHz. Tuning step size definitely is 166.667kHz (4MHz / 24),
> so this is wrong in your patch. Also all examples in the data sheet
> have bit 6 of the bandswitch byte set...
Errors in data sheets seem to be quite common, I only trust
tested code. Steve, if you can check Philips reference code
or Hauppauge Windoze driver code, this would be a more
reliable source for these numbers...
> There generally is a problem with dvb-pll.c: I miss functions to
> initialize and to "deinitialize" the tuner. This is very important for
> hybrid analog and digital cards. That's why i have my own versions in
> saa7134-dvb.c - including FMD1216. This should be changed some time.
Would should the "initialize" and "deinitialize" functions do?
I thought the PLL is used by both the analog and digital
demodulators, so all you do with the PLL when switching
between analog and digital is writing the new config
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