Subject:
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Re: Watch Dog Timer on legOs
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 13 Mar 1999 23:00:31 GMT
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Viewed:
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1166 times
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Giovannoni, Brian <Brian_Giovannoni@NAI.com> wrote:
> Anyone have any experience using Interrupts for the h8300? I want to add a
> watch-dog time routine to legOs. I was hoping someone could nudge me in the
> right direction?? I just need to understand how to access the system clock?
Not that I describe in great detail how to do exactly what you want to do,
but you probably want to take a look at:
http://graphics.stanford.edu/~kekoa/rcx/opcodes.html
A lot of the low-level RCX details are described there.
It sounds like you want to:
- read up on watchdog timers in the h8/300 manual
- store the address of your interrupt handler at fdbe, the interrupt vector
for the watchdog timer
- figure out how to setup and enable the watchdog timer, making sure you
don't create conflicts with the low-level internals of LegOS
There might be some asm issues to consider. In particular, your interrupt
handler needs to make sure to save and restore the registers that gcc
expects to be able to overwrite. I believe this means r0 through r3.
These are not saved by the ROM.
-Kekoa
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Message is in Reply To:
 | | Watch Dog Timer on legOs
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| Anyone have any experience using Interrupts for the h8300? I want to add a watch-dog time routine to legOs. I was hoping someone could nudge me in the right direction?? I just need to understand how to access the system clock? Brian -- Did you check (...) (26 years ago, 13-Mar-99, to lugnet.robotics)
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