Subject:
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RE: Firmware: IR transmission demystified
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 9 Nov 1998 23:38:25 GMT
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Original-From:
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Eric Eilebrecht <ericeil@microsoft#avoidspam#.com>
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Viewed:
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2655 times
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I'm curious, and sorry if this has come up before: Any chance someone can
get the RCX to communicate with IrDA devices? I'm thinking specifically of
small hand-held computers. I don't know much about infrared data
transmission, but it based on Markus' work it sounds like the IR port on the
RCX is not *entirely* hardwired...
Eric
-----Original Message-----
From: Markus L. Noga [mailto:Markus.Noga@inrialpes.fr]
Sent: Monday, November 09, 1998 2:01 PM
To: LEGO Robotics list
Subject: Firmware: IR transmission demystified
IR transmission was pretty tough to get at. Carrier frequency was the
final key - there are no crystals to create the IR carrier, so the
processor has to provide it.
It turns out that 8-bit t1 output is used for just that purpose. Guess
I'll have to rewrite my scheduler to use the 16bit timer now. Anyway,
native IR transmission works now.
--
Markus L. Noga noga@inrialpes.fr
INRIA Rhône-Alpes http://www.inrialpes.fr/
IPR Universität Karlsruhe http://wwwipr.ira.uka.de/
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