On Sunday 18 September 2005 18:11, Tyler Trafford wrote:
> Hans Verkuil wrote:
> > OK, I think I've fixed the problem of missing sound on the PVR150/500.
> > Please update to the latest svn and try again. Besides some bug fixes the
> > main cause seems to be the initialization of the Delay Lock Loops. If I
> > understand the datasheet correctly these DLLs are responsible for the
> > timings in the Luma ADC and the Audio Decoder.
> >
> > The initialization sequence should ensure that no false lock is detected
> > but the old sequence in the driver differs substantially from what
> > Hauppauge does, which in turn is much closer to the recommended procedure
> > from the datasheet. I suspect that sometimes, possibly depending on all
> > kinds of environmental factors (e.g. interference), a false lock is
> > detected and the audio decoder effectively no longer works. I also
> > suspect that the old sequence was unable to properly force a new attempt
> > to lock, so if was wrong from the start, it stayed wrong. It also
> > explains why some people could make it work by first running the
> > Hauppauge driver and then soft boot to linux: the Hauppauge driver forces
> > the correct DLL which remained correct in linux.
>
> This is interesting because Bryan Mayland pulled those setting out of
> the disassembled Windows driver- the exact datasheet method would only
> give us sound on every other driver load.
Perhaps it was based on an older Windows driver? I used the PVR150 driver
PVR150_22_22292.exe with c.corax hacked hcwPP2.sys driver that outputs all
I2C traffic (extremely useful BTW. Thanks, corax!). I tested it both with a
PVR150 and with a PVR500 and got the same output for both.
Also I followed the Hauppauge sequence which is differs somewhat from the
datasheet sequence. I trust Hauppauge more than Conexant :-)
But I'll have to wait for the results...
Hans
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