[MinnowBoard] Echo to MinnowBoardMax GPIO export fails

[Michael Jones]

John,

Nice, the script works on my board. I can also read values on the pin I need to use.

Thanks a million!

Now I just need to make a Haskell wrapper to go along with I2C module. If anyone else is crazy enough to use Haskell on the MinnowBoardMax, let me know.

Mike

On Jan 7, 2015, at 6:32 PM, John Hawley <john.hawley at intel.com> wrote:

> Ok I spent a little bit of time digging into this, it *LOOKS* like
> Ubuntu is offset by +256 vs. stock and/or Fedora kernels.  Not 100% sure
> why yet.
> 
> That being said I wrote up a quick script that should discover the right
> values for everything and output it to a text console:
> 
> https://github.com/warthog9/minnow-max-extras/blob/master/lse/what_gpio_num.sh
> 
> and I've got a merge request in with it (I'll let Darren have a look at
> it and yell at me about it before it gets merged).
> 
> If you are having problems, can you run that script and let me know if
> the output is right for you?  In the meantime I'll try and dig into why
> the offset.
> 
> - John 'Warthog9' Hawley
> 
> On 01/07/2015 06:51 AM, Michael Jones wrote:
>> Martin,
>> 
>> Very helpful, thanks. I had to think a bit to understand the base of 82 and 154.
>> 
>> For others:
>> 
>> For 8x, Code GPIO# = 338 + Linux GPIO# (Chart) - 82
>> For 2x, Code GPIO# = 410 + Linux GPIO# (Chart) - 154
>> 
>> So for the two examples:
>> 
>> 338 + 84 - 82 = 340
>> 
>> and
>> 
>> 410 + 208 - 154 = 464
>> 
>> I’ll give this a try later this week. 
>> 
>> Are there any proper ways to expose the /sys paths for user mode like one can do for /dev/ttyN? Or do people just run their code as root?
>> 
>> Mike
>> 
>> 
>> On Jan 5, 2015, at 7:29 AM, Martin Oldfield <elinux-mbmx-2014-11 at mjoldfield.com> wrote:
>> 
>>> I've also found wildly different GPIO numbers on my Minnowboard Max.
>>> 
>>> You can read about it at
>>> http://www.mjoldfield.com/atelier/2014/12/mbmx-gpio.html.
>>> 
>>> 
>>> 
>>> --
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