[Gumstix-users] Problems compiling with BitBake - Can't find header file gpio.h

[kindredvendetta <ja...@ec...>]

Hello,

I'm completely new to the Gumstix so sorry if this has been answered
elsewhere, but I haven't found anything to help fix my problem! It's
probably something obvious...

I'm trying to write an application in C which interfaces with the Gumstix
Overo's GPIO pins, exposed on the pin header on an attached Summit board.
I've successfully managed to manipulate the GPIO pins from the terminal by
echoing the appropriate data to the files in sys/class/gpio, but from the C
program I'd like to access the pins by calling functions such as
gpio_request and gpio_set_value, which I guess necessitates a "#include
<path/gpio.h>" at the beginning of the file.

However, I can't get it to compile. Bitbake returns an error: "No such file
or directory". Examples I see on the Internet suggest things such as
linux/gpio.h, mach/gpio.h and asm/gpio.h, none of which work. I did a search
for gpio.h on my system and there are 160 copies... not sure which one is
the correct one. They are in subfolders named for different architectures
under four main paths:

/overo-oe/tmp/work/armv7a-angstrom-linux-gnueabi/linux-libc-headers-2.6.23-r4/linux-2.6.23/include/
/overo-oe/tmp/work/overo-angstrom-linux-gnueabi/linux-omap3-2.6.30-r47/staging-pkg/staging/overo-angstrom-linux-gnueabi/kernel/
/overo-oe/tmp/work/overo-angstrom-linux-gnueabi/linux-omap3-2.6.30-r47/git/arch/
/overo-oe/tmp/staging/overo-angstrom-linux-gnueabi/kernel/

Does anyone have an idea which one is correct? I've tried a few edits to my
Bitbake file as well but not sure what to do as I don't fully understand
Bitbake yet... putting "-I path" in the do_compile section was suggested to
me, but hasn't worked. Do I need to edit this file? I've opened up some of
the gpio.h files and some of them contain references to including other
instances of gpio.h from elsewhere... this just seems to complicate things!

I know I could simply write C code to write and read directly from the files
in /sys/class/gpio but that won't fix the bigger problem - I should be able
to include a header file! I assume that would also give me problems with
using interrupts on these pins later on in development.

Thanks in advance for your help.
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