On Tue, 18 Jul 2006, Andrew de Quincey wrote: > On Tuesday 18 July 2006 05:32, Trent Piepho wrote: > > On Sun, 16 Jul 2006, Robert Schlabbach wrote: > > > From: "Andrew de Quincey" <adq_dvb@xxxxxxxxxxxxx> > > > > > > > 1) One tuner needs to send 5 bytes. > > > > I think this problem has been seen with other tuners too. > > > > > > You don't have to send 5 bytes. You can split the operation up. In fact, > > > most of the time you won't have to change all PLL settings anyway (e.g. > > > you can leave the AGC TOP setting unchanged after initialization), so > > > sending 4 bytes will still suffice... In fact, it won't only suffice, but > > > also save time & CPU cycles to write only the PLL registrs which you > > > actually need to change. > > > > Did you read this thread on the dvb list? > > http://www.linuxtv.org/pipermail/linux-dvb/2006-July/011583.html > > > > It's also about the agc top settings. I would hate to see too much work > > done which has failed to consider the points already discussed. > > Yes I am remembering about that. I've decided to wait till I get to that part > in the tuner refactoring before attempting to deal with it though. Right now > I removed the 5byte stuff 'cos it isn't needed (in the ones I have done _so > far_). Obviously it needs reconsidered when its needed. Keep in mind that the agc top needs to be re-programmed when the PLL is initialized, and when changing from analog to digital mode. There is no way to detect the latter condition now, so it is done on every tune. > Do you have the docs for the LG-H06xF and Thomson DTT761x so I can see the > situation for myself? No, those docs doesn't appear to be available. You can get the docs to the Infineon TUA603x PLL chips, which will tell you alot about what is going on. If you read that thread, you will see that I did some tests to see what effect the agc top setting has on the DTT7612. > mode 5th byte so the tuner would always be in the correct mode? On these > cards I assume v4l+dvb cannot be both active at the same time... whats the > mechanism for deciding which? They can both be active at once. It will even work fine if you use different inputs. For example, capturing an analog signal connected to the S-Video port and a digital signal from the tuner at the same time works. You can use a VCR to turn it into a pseudo-dual tuner card, one analog tuner, one digital tuner. Or instead of a VCR, a digital STB controlled by an IR transmitter that can get encrypted channels. You can try to use the tuner from both v4l and dvb at the same time. They will just play tug of war over it. I don't know why you would want to do it, but it can be done. _______________________________________________ linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
