[Gta04-owner] R1401-R1405

Andreas Kemnade andreas at kemnade.info
Tue Mar 20 09:10:47 CET 2012


On Mon, 19 Mar 2012 20:19:55 +0100
Christoph Mair <christoph.mair at gmail.com> wrote:

> Hi Andreas,
> On Mon, Mar 19, 2012 at 8:11 PM, Andreas Kemnade <andreas at kemnade.info> wrote:
> > does anyone know where these resistors are on the gta04?
> > I would like to check what I'm doing with the mcbsp1/si4721
> > and  check that with my osciloscope.
> They are located right next to the Si4721. If you have your board in
> front of you with the CPU on the right and the modem on the left, the
> resistors are on the right side of the Si4721 between the chip and the
> CPU. The order is (from top to bottom): R1401, R1402, R1403, R1404,
> C1402, C1403. Above the chip there is R1405.
Thank you very much.
I got symmetric square wave with a low frequency on R1401,R1403.
Higher frequency on R1405 whenever I'm doing playback or capture.
When playing to the Si4721 I had also a signal on R1404 which looks
like data. During capture I had also data on R1404. But with proper
configuration I got the data on R1402 where it belongs. 

So next action there will be checking of some rx flags in mcbsp
registers and if there is something different with dma on mcbsp1 than
on the other ones.

> > At the moment I can sink audio data into mcbsp1 with a sane
> > rate.
> Yea!
> Christoph
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