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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