Subject:
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Re: Interrupt for serial data
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 13 Feb 1998 23:21:24 GMT
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Original-From:
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Max Davies <MDAVIES@CAMsaynotospam.ORG>
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Viewed:
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1382 times
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Fred G. Martin wrote:
> Jan-Sipke,
>
> You're really pretty far away from having this
> work. It's not just a
> matter of redirecting the serial interrupt; when
> you get there, you
> have to:
>
> * store incoming character in a buffer
> * advance the buffer pointer
> * check the buffer for overruns
>
> then you need a separate subroutine which
> fetches the character from
> the buffer (checking first if there is anything
> there), and decrements
> the buffer point.
>
> learning how to write interrupt code is probably
> the hardest part of
> assembly programming. my best advice to you is
> to simply write code
> on the PC side to slow down your transmit
> character rate until things
> work. and make sure on the HB side, you're in a
> tight loop receiving
> characters when communications are in progress.
Sipke obviously realizes that more work is needed,
and justs want to get to step 1 first by
recognizing the interrupt. That is exactly what I
would do too.
I've been thinking about writing an
interrupt-driven serial receive routine too, but
haven't had the time for it yet. Such a method
would be magnitudes better than the 'tight-loop'
reception method which I find always gives me
trouble once my program gets complicated enough to
not run as fast as I would like.
On the other hand, maybe there's a comprimise
approach: Try writing 'C' code that you run as a
seperate high priority process to poll for serial
input and buffer it, and add a support routine
that your normal code can call to pull characters
out of that buffer.
/Max
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Message has 1 Reply:
 | | public apology
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| Yes -- I didn't think very hard and in retrospect it's fairly evident that Jan-Sipke's code is just the starting step. Sorry for being such a blunderhead. (Jan-Sipke and I have been exchanging some private messages and I think he's closing in on a (...) (27 years ago, 14-Feb-98, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Re: Interrupt for serial data
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| Jan-Sipke, You're really pretty far away from having this work. It's not just a matter of redirecting the serial interrupt; when you get there, you have to: * store incoming character in a buffer * advance the buffer pointer * check the buffer for (...) (27 years ago, 13-Feb-98, to lugnet.robotics.handyboard)
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