Subject:
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Re: random dodgy sensor readings?
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 29 Dec 1997 18:16:48 GMT
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Original-From:
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Ian Bagley <ian@bagley&StopSpam&.demon.co.uk>
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Viewed:
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1253 times
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In article <34A7A55B.9E3A63BA@parlance-ncs.com>, Mike Vande Weghe
<vandeweg@parlance-ncs.com> writes
> About 2 weeks ago Bill Bynum sent in a fix for a bug that one of his
> students had discovered. The student was using multiple processes to
> read analog values, and noticed spurious readings. The problem caused
> by IC making context switches after the A/D channel had been selected,
> but before the reading had been taken. The student's fix was to wrap a
> pair of "hog_processor()" and "defer()" commands around the sensitive
> code. The student did this in the analog() function in lib_hb.c, but it
> seems like an even better place would be within the raw_analog()
> function, since that would also protect any calls you might be making
> to knob().
>
> If you are using multiple processes to read your analog() values, this
> might be the problem.
>
> - Mike
Thanks,
I'm not using multiple processes, however i am using the servo routines,
perhaps this has a similar effect? I will try putting in the hog and
defer pair and let you know what the results are.
See you later!
___ IAN
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WWW.BAGLEY.DEMON.CO.UK|__|IAN@BAGLEY.DEMON.CO.UK
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Message is in Reply To:
 | | Re: random dodgy sensor readings?
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| About 2 weeks ago Bill Bynum sent in a fix for a bug that one of his students had discovered. The student was using multiple processes to read analog values, and noticed spurious readings. The problem caused by IC making context switches after the (...) (27 years ago, 29-Dec-97, to lugnet.robotics.handyboard)
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