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Re: [Haskell-cafe] Timing in atom -- how consistent?

Subject: Re: [Haskell-cafe] Timing in atom -- how consistent?
From: John Van Enk
Date: Fri, 1 Jan 2010 10:48:53 -0500
Hi Jason,

Regarding timing, the version of blink_atom.c below does not contain this, but my later versions used the hardware timers to control the blink rate.

One can setup the interrupt vector for a hardware timer to call your outermost atom function at whatever resolution you want. As long as the timer allows enough time between expirations for any of the task groups to finish, it will run in hard real time.

Hope this helps.

John Van Enk

On Thu, Dec 31, 2009 at 10:43 PM, Jason Dusek <[email protected]> wrote:
 I'm working with Atom to program an ATtiny25. I am curious
 about how consistent the timings actually are.

 Consider John Van Enk' example of blinking a LED on an


 We see that sometimes `setLED' is executed and sometimes not.
 When `__clock' is incremented, it will be incremented
 sometimes sooner, sometimes later.

 Also, I am a little puzzled by the `__coverage` variable. What
 does it do?

 As for my project/motivation -- I'm just trying to blink a
 little LED on much less robust/rich kit -- the Trippy RGB
 Waves kit from Lady Ada. I am (gratuitously) exploring ways to
 program it with Haskell.

Jason Dusek
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