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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Ada / Automation fellows
Date: Sun, 29 Mar 2015 11:52:06 +0200
Organization: cbb software GmbH
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Xref: news.eternal-september.org comp.lang.ada:25323
Date: 2015-03-29T11:52:06+02:00
List-Id: <comp.lang.ada>

On Sun, 29 Mar 2015 10:56:07 +0200, Björn Lundin wrote:

> 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

Thanks. We considered most of this, I believe, and decided for device tree.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de