From: Philip Munts <philip.munts@gmail.com>
Subject: Re: GNATCOLL-Mmap example
Date: Tue, 28 Jan 2020 12:18:01 -0800 (PST)
Date: 2020-01-28T12:18:01-08:00 [thread overview]
Message-ID: <ec5138af-d91d-4f4c-ad73-d6de2372fe1d@googlegroups.com> (raw)
In-Reply-To: <f3c0a81a-c0a9-4ed8-8ba5-8971cd2ce13f@googlegroups.com>
On Tuesday, January 28, 2020 at 11:11:12 AM UTC-8, Philip Munts wrote:
> Or better yet, use my libsimpleio:
>
> https://github.com/pmunts/libsimpleio
>
> The sysfs API for GPIO is now deprecated.
>
Here is a quick example using libsimpleio:
WITH GPIO.libsimpleio;
WITH RaspberryPi;
PROCEDURE test_gpio IS
outp : CONSTANT GPIO.Pin :=
GPIO.libsimpleio.Create(RaspberryPi.GPIO18, GPIO.Output);
BEGIN
LOOP
outp.Put(True);
outp.Put(False);
END LOOP;
END test_gpio;
On a Raspberry Pi 4, which is what happens to be plugged in today, I measured a 360 kHz square wave at GPIO 18. Never mess around with memory mapped I/O unless you need insanely high performance. Then you would probably want to use DMA anyway.
Phil
next prev parent reply other threads:[~2020-01-28 20:18 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
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 [this message]
2020-01-28 22:06 ` Bob Goddard
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