Hi Jim-
Thanks for your response. I think that something is happening that I don't
understand, like maybe some other piece of software has taken over those pins
according to the kernel/driver. I don't believe that I've blown them because
the kernel doesn't even setup the sysfs/socket interface like it does for the
working pins; so I think it's not allowing me to try; rather than the hardware
being broken.
I don't need them working so I probably won't dig much deeper into this.
Perhaps some future archaeologist will stumble across this post and explain how
to use those pins on 2.6.
-e
--- In Jim Jackson <> wrote:
>
>
>
>
> On Mon, 21 Feb 2011, erik_dykema wrote:
>
> > Hi Joel-
> > Thanks for your response! I think you're answering a slightly
> > different question than I'm asking, probably because my question was
> > screwy.
> > To restate my question, whichever numbers we use to refer to the pins,
> > how do I address those pins via sysfs? These are the pin numbers (using
> > Joel's numbering scheme) that I've been able to successfully address, and
> > use to light LEDs:
> >
> > Top down view of the header showing pin numbers (Joel's numbers):
> > ----------------------------------
> > 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16
> > ----------------------------------
> > 1 | 3 | 5 | 7 | 9 | 11 | 13 | 15
> > ----------------------------------
> >
> > Format: /sys/class/gpio/gpio# -> Pin #
> > 8:1
> > 9:3
> > 10:5
> > 11: ??
> > 12: ??
> > 13:11
> > 14:13
> > 15:15
> >
> > So, I know that I can address the bottom row of pins using
> > /sys/class/gpio/gpio8-15 , except for pins 7 and 9. So how do I address
> > pins 7 and 9? One would think, based on the /sys/class/gpio/gpio#
> > pattern, that it would be gpio11 and gpio12 ; but those don't work. Any
> > suggestions appreciated.
>
> No idea - never used a 2.6 kernel and this particular gpio module.
>
> But I can confirm that those pins are accessable as the correct bits
> via the DIO1 address bits, as detailed in the manual. That is, as long as
> you haven't hooked up 5 volts logic and blown them!
>
> Jim
>
> ----------------------------------------------------------------------------
> HomePage: http://www.comp.leeds.ac.uk/jj
> TS7200 Page: http://www.comp.leeds.ac.uk/jj/linux/arm-sbc.html
>
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