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@xxxxxxxxx> 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@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, >> >> >> >> _______________________________________________ >> Kernelnewbies mailing list >> Kernelnewbies@xxxxxxxxxxxxxxxxx >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> >> > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
