From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.2 required=5.0 tests=BAYES_00,FREEMAIL_FROM,
	FROM_STARTS_WITH_NUMS autolearn=no autolearn_force=no version=3.4.4
X-Received: by 2002:ac8:5205:: with SMTP id r5mr23516262qtn.230.1580242623093;
        Tue, 28 Jan 2020 12:17:03 -0800 (PST)
X-Received: by 2002:aca:cdd6:: with SMTP id d205mr3927646oig.90.1580242622952;
 Tue, 28 Jan 2020 12:17:02 -0800 (PST)
Path: 
 eternal-september.org!reader01.eternal-september.org!feeder.eternal-september.org!news.gegeweb.eu!gegeweb.org!usenet-fr.net!proxad.net!feeder1-2.proxad.net!209.85.160.216.MISMATCH!g89no8448882qtd.0!news-out.google.com!o19ni1304qtr.1!nntp.google.com!g89no8448870qtd.0!postnews.google.com!google-groups.googlegroups.com!not-for-mail
Newsgroups: comp.lang.ada
Date: Tue, 28 Jan 2020 12:17:02 -0800 (PST)
In-Reply-To: <r0q4an$s8f$1@gioia.aioe.org>
Complaints-To: groups-abuse@google.com
Injection-Info: google-groups.googlegroups.com;
 posting-host=2001:8b0:ca:2:0:0:0:fd;
 posting-account=TiHetgoAAACluCgYkPc8-TWs6dBNgSne
NNTP-Posting-Host: 2001:8b0:ca:2:0:0:0:fd
References: <a97a7b9a-48b5-4741-927c-a8ac2b44c80b@googlegroups.com>
 <r0or5j$7t3$1@gioia.aioe.org>
 <d62dca95-7349-47eb-8858-46980fbb0088@googlegroups.com>
 <r0q4an$s8f$1@gioia.aioe.org>
User-Agent: G2/1.0
MIME-Version: 1.0
Message-ID: <6a365294-65bb-4bd5-82d1-69d7b5aac04b@googlegroups.com>
Subject: Re: GNATCOLL-Mmap example
From: Bob Goddard <1963bib@googlemail.com>
Injection-Date: Tue, 28 Jan 2020 20:17:03 +0000
Content-Type: text/plain; charset="UTF-8"
Xref: reader01.eternal-september.org comp.lang.ada:57978
Date: 2020-01-28T12:17:02-08:00
List-Id: <comp.lang.ada>

On Tuesday, 28 January 2020 20:07:56 UTC, Dmitry A. Kazakov  wrote:
> On 2020-01-28 19:53, Bob Goddard wrote:
> > On Tuesday, 28 January 2020 08:25:25 UTC, Dmitry A. Kazakov  wrote:
> >> On 2020-01-25 22:52, Bob Goddard wrote:
> >>
> >>> I need to map the RPi's GPIO memory addresses so that I can do what I need to do.
> >>
> >> See files under:
> >>
> >>      /sys/class/gpio
> >>
> >> You can use standard Ada I/O to read and set GPIO pins. E.g.
> >>
> >>      /sys/class/gpio/gpio/XXX/value
> > 
> > This was the way I started, but could not get it to read anything. It just blocks trying to read a single character. My c code works fine using the wiringPi libs.
> 
> If I correctly remember you should rewind the file after each reading.

It did not get that far. It blocks right at the start.