Subject:
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RE: Workin' its little heart out?
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 23 Dec 1996 18:58:04 GMT
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Original-From:
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Chuck McManis <cmcmanis@freegate.%antispam%net>
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Viewed:
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1484 times
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The trick is to make sure that if you get simulataneous interrupts you
services them both before returning.
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From: Mike Ross[SMTP:mross@outland.jsc.nasa.gov]
Sent: Monday, December 23, 1996 12:59 AM
To: handyboard mailing list
Cc: TRP mailing list
Subject: Workin' its little heart out?
Hi, all...
A generic 68HC11 question-
I (sorta) got my code running this weekend. I'm trying to get a 68HC11E1
to operate all 4 OC and IC lines on interrupts. I have about 800
instruction cycles spread over 8 interrupt routines. The waveform
I'm trying to capture and then reproduce is the R/C PWM signal, which
means I have about 1 msec minimum to fire all 8 interrupts. Now, 800
instruction cycles should take about 0.4 msec, so it would seem I have
ample time.
AND YET! The lowest priority interrupt (IC4) doesn't get serviced nearly
as often as the others, making me think it's missing pulses. My main code
is just a print loop, while the IRQ routines run in the background.
Is there some other activity going on in the processor for which I have
failed to account? I have yet to activate the SPI port, so I don't want
to overload the cpu.
Thanks for any thoughts...
-mike
* Michael L. Ross/C33 | Lockheed Engineering & Sciences Co.****
* Robotics Department | 2400 Nasa Rd. 1, Houston, TX 77058*****
*(713)333-7094 voice,(713)333-6071 fax*#include <disclaimer.h>*
* Finger me for my public key. mross@outland.jsc.nasa.gov ****
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