From: Bob Goddard <1963bib@googlemail.com>
Subject: Re: GNATCOLL-Mmap example
Date: Tue, 28 Jan 2020 12:17:02 -0800 (PST)
Date: 2020-01-28T12:17:02-08:00 [thread overview]
Message-ID: <6a365294-65bb-4bd5-82d1-69d7b5aac04b@googlegroups.com> (raw)
In-Reply-To: <r0q4an$s8f$1@gioia.aioe.org>
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.
next prev parent reply other threads:[~2020-01-28 20:17 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-25 21:52 GNATCOLL-Mmap example Bob Goddard
2020-01-28 2:10 ` Stephen Leake
2020-01-28 5:59 ` J-P. Rosen
2020-01-28 8:25 ` Dmitry A. Kazakov
2020-01-28 18:53 ` Bob Goddard
2020-01-28 20:07 ` Dmitry A. Kazakov
2020-01-28 20:17 ` Bob Goddard [this message]
2020-01-29 8:19 ` Dmitry A. Kazakov
2020-01-29 21:56 ` Bob Goddard
2020-01-30 2:45 ` Dennis Lee Bieber
2020-01-31 16:59 ` Björn Lundin
2020-01-28 19:11 ` Philip Munts
2020-01-28 20:15 ` Dmitry A. Kazakov
2020-01-28 20:18 ` Philip Munts
2020-01-28 22:06 ` Bob Goddard
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