Re: [Gumstix-users] digital io

[Ben E. <be...@cy...>]

Awesome! Thanks so much.
Ben
Dave Hylands wrote:
> Hi Ben,
>
> On 5/31/06, Ben Erridge <be...@cy...> wrote:
>> LOL, I'm a programmer I have 0 soldering skills.
>> So for setting GPIO programatically the only example I have found was in
>> the S30bluetooth module, which does this:
>> /sbin/modprobe proc_gpio
>> echo AF1 out > /proc/gpio/GPIO12
>>
>> So I looked in /proc/gpio which has GPIO01-GPIO84 plus GAFR,GPDR, and 
>> GPLR
>> the lines in those files look something like
>> file GPIO16 reads:
>> 16   GPIO   in   set
>>
>> file GPIO42 reads:
>> 42   AF3   in   set
>>
>> So, if I want to set a GPIO I can follow the example in S30bluetooth but
>> change the file being written? Also there are some file which have GPIO
>> in field 2 some have AF3 in field 2, some have AF1, etc.
>> what does the second field mean?
>
> You can find some code samples (in C) over here:
> <http://websvn.gumstix.com/filedetails.php?repname=Buildroot&path=%2Fbranches%2Fprojects%2Frobostix%2Fgumstix%2FCommon%2FSerialLog.c&rev=0&sc=0> 
>
>
> For finding out more information about the alternate functions, see
> section 4.1 of the PXA 255 Developer's Manual
> http://www.intel.com/design/pca/applicationsprocessors/manuals/278693.htm
>