From: Brian Orpin <abuse@borpin.co.uk>
Subject: Re: Using "delay until" in real-time
Date: Wed, 13 Dec 2000 08:02:42 +0000
Date: 2000-12-13T08:02:42+00:00 [thread overview]
Message-ID: <p8ae3ts6j2pt5ulo5c5sjko14jksr46es1@4ax.com> (raw)
In-Reply-To: 9168vi$7mp$1@nnrp1.deja.com
On Tue, 12 Dec 2000 22:31:14 GMT, Ted Dennison <dennison@telepath.com>
wrote:
>I did simplify things a bit for my question. We are actually using 4
>minor cycles in our 60Hz major cycle. Under the scheme we use here
>things can only run once a major cycle, so the fastest with the current
>settings would be 60Hz. However, we can adjust the minor cycle used in
>order to prevent jitter in those tasks that are expecially sensitive to
>it (eg: Controls and the Visual system). So our executive is *actually*
>running at 240Hz (but of course this doesn't affect the math problem.
>1/240th still a repeating decimal).
Counter : Natural := 0
Freq1 : constant := 4;
Freq2 : constant := 2;
Min_Freq : constant := Freq1;
begin
Counter := (Counter mod Min_Freq) +1;
-- do it every other cycle.
if Counter mod Freq2 = 0 then
do Task1;
end if;
-- do it every 4 cycles
if Counter mod Freq1 = 0 then
do Task2;
end if;
-- do it every 4 cycles but on a different cycle to task2
if Counter + 1 mod Freq1 = 0 then
do Task3;
end if;
end;
--
Brian Orpin BAE SYSTEMS, Edinburgh
"If you really know C++, there isn't much you can't do with it, though it may
not always be what you intended!" Tucker Taft 1998
next prev parent reply other threads:[~2000-12-13 8:02 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-12-12 16:27 Using "delay until" in real-time Ted Dennison
2000-12-12 18:01 ` Mike Silva
2000-12-12 19:57 ` Ted Dennison
2000-12-12 23:02 ` Mike Silva
2000-12-12 23:49 ` Ted Dennison
2000-12-18 6:26 ` Ray Blaak
2000-12-12 20:00 ` Ken Garlington
2000-12-12 20:40 ` Ted Dennison
2000-12-13 4:02 ` Ken Garlington
2000-12-13 14:29 ` Ted Dennison
2000-12-13 16:53 ` Larry Hazel
2000-12-13 17:41 ` Ted Dennison
2000-12-12 20:22 ` Keith Thompson
2000-12-12 20:54 ` Ted Dennison
2000-12-13 5:35 ` tmoran
2000-12-12 20:23 ` David C. Hoos, Sr.
2000-12-12 21:58 ` Ted Dennison
2000-12-12 23:18 ` Jeff Carter
2000-12-12 21:18 ` JP Thornley
2000-12-12 22:31 ` Ted Dennison
2000-12-13 8:02 ` Brian Orpin [this message]
2000-12-13 17:32 ` JP Thornley
2000-12-12 23:09 ` Ted Dennison
2000-12-13 7:43 ` Brian Orpin
2000-12-15 0:27 ` Frank
2000-12-19 7:50 ` Martin Gangkofer
2000-12-20 3:32 ` Ted Dennison
2000-12-20 5:29 ` tmoran
2000-12-20 7:59 ` Martin Gangkofer
2000-12-20 9:15 ` java servlets JF Harrison
2000-12-20 12:50 ` Using "delay until" in real-time Marin David Condic
2000-12-21 0:08 ` Alejandro R. Mosteo
2000-12-20 3:17 ` Ted Dennison
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox