Subject:
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Re: Interrupt routine hangs
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 15 Feb 1996 15:58:12 GMT
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Original-From:
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Fred G. Martin <fredm@media.mit.eduANTISPAM>
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Viewed:
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2715 times
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You can't just put your code whereever you like in memory.
Use IC's .icb file format, which lets it relocate code as necessary.
-F
> Hi all,
>
> I'm trying to use IC to poke in a small ISR at $B600, to be fired by a
> change-of-state on PA0 (IC3 interrupt). All loads well, and the IC main
> routine monitors a memory location to watch for signs of the interrupt's
> occurrence. However, when I trigger the interrupt, the hearbeat stops.
>
> Here's the ISR-
>
> OPT l,c,cre,s ; turn on a bunch-o-options.
>
> TFLG1 EQU $1023
> PLEN EQU $B650 ; memory location to mark ISR execution
>
> ORG $B600
> BSET TFLG1 #%00000001 ; clear interrupt-pending flag LSB=1
> LDD #$00FF ; mark passage through here
> STD PLEN ; by setting $B650 to 0x00ff
> RTI
>
> The $FFEA:$FFEB memory locations, where the interrupt vector for IC3I
> resides, has been set to $B600. I've set it to trigger on rising edges
> received at PA0. The interrupt gets triggered, but immediately hangs. I'm
> pretty rusty with assembler, so is there something obvious I'm missing?
>
> Thanks for any help.
>
> -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 ****
> * If you weren't a socialist in your twenties, you had no heart.
> * If you weren't a conservative by your thirties, you have no brain.
>
>
>
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