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From: =?UTF-8?B?QmrDtnJuIEx1bmRpbg==?= <b.f.lundin@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Ada / Automation fellows
Date: Sun, 29 Mar 2015 10:56:07 +0200
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Date: 2015-03-29T10:56:07+02:00
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On 2015-03-28 15:55, Dmitry A. Kazakov wrote:

>>>
>>> A short question. How do you access GPIO on Raspberry Pi? Over the text
>>> file devices?
>>>
>>> We access GPIO, analogue inputs and PWM output through text files. It looks
>>> crazy to me. Is there a better way?


I forgot to mention 'Mastering the Raspberry Pi'
by Warren Gay.
http://www.apress.com/9781484201824

He describes the Pi in *great* detail.
And there is a chapter (12) on GPIO where he explores

* GPIO via sysfs
* GPIO events/interupts. Also via sysfs - get a notification/callback
when an IO-port changes state

and
* GPIO via memory mapped file


a short c-module to map the GPIO part of memory and then
* set_bit
* get_bit

functions to manipulate the IO-ports without sysfs



--
Björn