Re: SPI over GPIO

[Tirtha Ghosh <gtirtha@xxxxxxxxx>]

Have you try setting GPIO direction to out before writing to it???
give a shot.

follow: http://sites.google.com/site/bifferboard/Home/gpio

On Fri, Mar 11, 2011 at 4:04 PM, Alexandru Caramida <alexandruc1723@xxxxxxxxx> 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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