From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: GNATCOLL-Mmap example
Date: Tue, 28 Jan 2020 21:07:53 +0100
Date: 2020-01-28T21:07:53+01:00 [thread overview]
Message-ID: <r0q4an$s8f$1@gioia.aioe.org> (raw)
In-Reply-To: d62dca95-7349-47eb-8858-46980fbb0088@googlegroups.com
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.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2020-01-28 20:07 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 [this message]
2020-01-28 20:17 ` Bob Goddard
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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