SPI over GPIO

[Kaustubh Ashtekar]

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paste output of:

strace <your full command>

On Fri, Mar 11, 2011 at 4:04 PM, Alexandru Caramida
<alexandruc1723 at yahoo.com> wrote:
> Hello everyone,
> I am trying to emulate an SPI interface using four GPIO pins. This is a
> desktop computer with linux 2.6.28 kernel.
> The problem is I don't know if the pins are working. I read that if I have
> the sysfs support for the kernel (which I do :D) all I have to do
> is enable the respectiv pin using
> echo N > /sys/class/gpio/export
> And I would get a gpioN directory
> But I always get: "write error : invalid argument."
> Is there some other option i need to enable first? The people I am working
> with assured me that these pins are not used by any other device and they
> haven't found anything to suggest that they were turned off manualy.
> Please help,
>
>
>
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