Re: [Gumstix-users] GPIO pin 171 - "mode 5"??

[Steve S. <sa...@gm...>]

On Thu, Feb 4, 2010 at 7:36 AM, RayS <ra...@bl...> wrote:
> We are trying to utilize pin 171 for SPI com with a TI ADC dev board and
> Palo43, however, it appears that the standard kernel image is using 171 for
> another purpose; does anyone know what that is, and can we eliminate/change
> it?

The standard kernel image uses that pin for the SPI-1 clock signal.

> Would anyone care to share an image that has SPI built and available on the
> Palo43 edge pin?

The standard image is set up for SPI -- in fact the SPI channel is
used for the touchscreen controller on your Palo43!

> Also, the docs do not show a "mode 5" function with pin 171, only mode 4.
> What is going on?

There is no mode 5 for that pin!  Why do you ask about mode 5?

> Lastly, is there a stripped down image available, one that has NO built in
> support for audio etc? This might help simplify the development of devices
> such as these real-time controllers, where peripherals could only cause
> these conflicts.

No, but you should be able to easily strip out features you don't need
by customizing your kernel build and starting with a simple image like
the omap3-console -image.

Steve

> Ray Schumacher
> R&D Manager - Cognitive Vision
> 8580 Production Ave. Ste. B, San Diego, CA 92121
> rays@CognitiveVision.com
>
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