[Gumstix-users] GPIO manipulation from a user-space C program

[Matthew B. <ma...@aw...>]

Hi all

I'm trying to track down the cleanest way of manipulating a GPIO signal on
my gumstix board. I understand the IN/OUT and AF1, GPIO settings as I can
get things working in shell-script land using `echo "GPIO OUT SET" >
/proc/gpio/GPIO81` and that sort of thing.

but in C, I presume its a bit cludgy to say something resembling 
- system("echo... /proc/gpio/, etc, etc");
I have found an example here
http://docwiki.gumstix.org/index.php/Sample_code/C/gpregs
which seems to be giving a nice wrapper around some functions. I am not
willing to try it first though, as I've read about the kernel space versus
user space limitations. I probably can't break anything and I'll look silly
for being so cautious, but does anyone know if this is the way to work
directly with hte GPIO lines in C, or am I barking up the wrong tree?

thanks for any help.

Best regards
 
Matt Bowles
Embedded Systems Engineer
aWma Pty Ltd
Water Control Solutions
Design - Manufacture - Install
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Phone 0427 680 641

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