[Gta04-owner] fm-tuner - was Re: hw routing audio patch removed in 3.7?

[Christoph Mair]

Am 23.10.2013 19:14 schrieb "Andreas Kemnade" <andreas at kemnade.info>:
>
> On Wed, 2013-10-23 at 18:52 +0200, Andreas Kemnade wrote:
> > On Wed, 2013-10-23 at 15:25 +0200, Christoph Mair wrote:
> > > On Wed, Oct 23, 2013 at 1:06 PM, Andreas Kemnade <andreas at kemnade.info>
wrote:
> > > > On Mon, 2013-06-24 at 11:38 +0200, Dr. H. Nikolaus Schaller wrote:
> > > >> Hi,
> > > >> fm-radio appears to work. At least on one board (the one where I
did solder some wires to measure the clocks and PCM signals).
> > > >> [...]
> > > >> Now comes the bad news: it works only on one GTA04 board and I
don't
> > > >> know why it fails on the others I have tested. Since they have no
wires I
> > > >> can't check if the clocks are available and the Si47xx is sending
PCM
> > > >> to the CPU or not. Or if there is something unreliable in the
McBSP config.
> > > >>
> > > >> It could also be some hardware issue. If you look into the
schematics, there
> > > >> are series resistors for the McBSP1 interface. Their values are
choosen
> > > >> based on the recommendations of a reference design we had found.
> > > >>
> > > >> But 2k2 appears a little high value, taking into account that we
have a 2.5 MHz
> > > >> clock. I.e. the signals may be damped and too slow so that e.g.
the clocks
> > > >> are not recognized correctly.
> > > >>
> > > > I do not understand the connection here. The McBSP sends out its
clocks.
> > > > It should look at the data pin at the right times and interpret
whatever
> > > > is avilable there at sampling time if i understand the I2S stuff
> > > > correctly. So we should be able to read some suff and arecord should
> > > > spit out something.
> > >
> > > One thing which comes to my mind: did you mux the clock output pin as
> > > input? While this seems wrong, the McBSP needs this configuration to
> > > use its own clock as receive clock. The pin works as output
> > > nonetheless.
> > >
> > Ehm,.. I should have followed the link about uboot in the mail. As
> > pinmux settings in uboot are of course right (everything to output I
> > thought, I have checked that often), I thought hns has accidently run an
> > ancient uboot instead of an old one...
> > So I did not update my uboot. Ok, that seems to be the missing part of
> > information I needed all the time when I was experimenting with that.
> > At least I now get something out of the McBSP1. Now I am searching my
> > headphone.
>
> Ok, I found my headphone, I put the gta04 near a window on the side
> towards the radio station, replaced the arecord | aplay pipe  in the
> script by
>
> arecord -D default:CARD=gta04fm -r 48000 -f S16_LE -c 1 | aplay -r 48000
> -f S16_LE -c 1
>
> and I had reception with good sound quality.

Hey, congrats! Great to hear that :)

Regards,
  Christoph
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