GPIO link Re: The audio IC Wolfson WM8753 is cool :)))))

Robert Michel openmoko at
Wed Dec 13 00:50:49 CET 2006

Salve Koen, *!

Robert Michel schrieb am Mittwoch, den 13. Dezember 2006 um 00:12h:
> > On Tue, 12 Dec 2006, Koen Kooi wrote:
> > > > PS: Again, it seems that an FPGA between the I/O connectors
> > > >     and the other chips would encrease the power of the Neo1973,
> > > >     e.g. the FPGA could switch the second audio jack to mono output.
again that was an example, switching SPI to an audio jack would be
another... :)
> > > As can a GPIO. Stop with the fpga nonsense and get a devboard to play with

> The WM8753 hasen't GPIO support, but the WM9714 would
Oh, I was wrong - I should have read on in the WM8753 manual.
> I thing it is cool that the WM8753 has 3 channel DAC audio out and it
> would worth it to make all 3 usable simultanious ;)

In case the Neo1973 would have two 2,5 mm audio connector,
GPIO could switch one of this connector (orignial audio in) 
to mono headphone out?

Possible stats of audio IO with two stereo audio jacks:

2 lines in, 2 lines out
2 mic in, 2 lines out
1 line + 1 mic in, 2 lines out
1 line or mic in, 3 lines out
instead of 2 line out it could be stereo headphone out
or 1 line + 1 mono headphone out
instead of 1 line out it could be mono headphone out

That would make about 12 possible combinations.

Will GPIO be overrule by software - e.g. disabling the automute of
the speakes when a headphone/lineconnector is plugged in?


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