From: Ted Dennison <dennison@telepath.com>
Subject: Re: Using "delay until" in real-time
Date: Wed, 20 Dec 2000 03:17:41 GMT
Date: 2000-12-20T03:17:41+00:00 [thread overview]
Message-ID: <91p8ci$3fb$1@nnrp1.deja.com> (raw)
In-Reply-To: 915jl7$jt5$1@nnrp1.deja.com
I finally did get a solution to this that worked to my satisfaction.
In article <915jl7$jt5$1@nnrp1.deja.com>,
Ted Dennison <dennison@telepath.com> wrote:
> o Figure out what the denominator is (60 in this case), and redo
> the calculation every time that number of runs have happened.
>
> For instance, in the above code, I'd add something like:
> Runs := Runs + 1;
> if Runs >= Natural(Iteration_Hz) then
> -- Adjust for drift due to rounding errors.
> Runs := 0;
> Run_Time := Run_Time + Ada.Real_Time.To_Time_Span (1.0);
> Next_Time := Run_Time;
> else
> Next_Time := Next_Time + Iteration;
> end if;
This was close to my final solution, but not quite. Instead, it ended up
causing *more* problems with missed clocks. The solution was to use the
above code, except that all calls to "To_Time_Span" are replaced by
calls to "Ada.Real_Time.Nanoseconds", which gives better accuracy.
Real_Time.Microseconds would probably have been sufficient, but this
works too, and is a bit more portable.
--
T.E.D.
http://www.telepath.com/~dennison/Ted/TED.html
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prev parent reply other threads:[~2000-12-20 3:17 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
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 [this message]
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