SPI over GPIO

[Vic]

Try setting 3 Pins as Out (Clk, CS, MOSI (MasterDataOUT)) and 1 as IN
for MISO (MasterDataIn)

On Fri, Mar 11, 2011 at 3:08 AM, Kaustubh Ashtekar <ksashtekar at gmail.com> wrote:
> Please paste the full log of what you typed on the console and also
> 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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>>
>
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