Subject:
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Re: Comuniction with PC (2)
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 17 Jun 1997 17:00:14 GMT
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Original-From:
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Mike Ross <mross@outland.jsc.nasa.IHATESPAMgov>
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Viewed:
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1552 times
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On Tue, 17 Jun 1997, [ISO-8859-1] Germán Pablo Gentile wrote:
> I'm developering a project . This project need comunication from Pc to 8
> Handy boards(outside of IC, i'm working with Delphi). My problem is : How i
> can comunicate with 8 handy , without collitios???. Well , i think in send
> message to all the handy via rs-232 , with a header telling wath number of
> handy receive the message, and via software the correct handy board receive
> and discriminate the message. My problem is inthe reverse way, when the
> handys send message to the PC... In this way can happen more of 1 transmit
> at the same time!!! I think a solution may be , 8 input board and when one
> transmitt the other inputs don't receive message. But I have not idea how i
> can drive that. Please any help or idea , i have thanks for ever.
>
> I have to say this always, sorry for my poor english !!!
>
> German Gentile
> ggentile@cvtci.com.ar
German Gentile from Argentina, hmmmmm..... Well, it fits my
USA-media-distorted, sitcom-soaked, soundbyte-educated worldview!
Sounds like you need to use the SPI (Serial Peripheral Interface) ports on
the Handyboards. When one of the slaves wishes to talk, it asserts a
signal line so the others stay quiet. Does the PC have a SPI port?
Another way would be to run a common signal that one processor could
assert and disable any other talking, allowing you to then use any
communications method you want. Or you could have each processor listen
for a while, and talk if the line is quiet (a la Ethernet). That last
will result in some collisions, so you'll have to be able to recover
gracefully.
-mike
* Michael L. Ross/C33 | Lockheed Martin Eng & Sci Svcs Co. ****
* Robotics Department | 2400 Nasa Rd. 1, Houston, TX 77058*****
* (281)333-7094; (281)333-6071 fax* #include <disclaimer.h>*
* Finger me for my public key. mross@outland.jsc.nasa.gov ****
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Message has 1 Reply:
 | | Re: Comuniction with PC (2)
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| Just another idea. What if you attached all the boards in a ring, sort of the token ring network idea that IBM used in their networks. Only make communications go in a clockwise path, and give each board an id#. Send the number and then the info. (...) (27 years ago, 17-Jun-97, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Comuniction with PC (2)
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| I'm developering a project . This project need comunication from Pc to 8 Handy boards(outside of IC, i'm working with Delphi). My problem is : How i can comunicate with 8 handy , without collitios???. Well , i think in send message to all the handy (...) (27 years ago, 17-Jun-97, to lugnet.robotics.handyboard)
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