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'slightly [OT] - light pipes and IRDA'
1998\02\12@114020 by Steve Lawther

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    Has anybody used light pipes OR optical fibre to route the IR from
    IRDA?
    Does it work?
    What company's products should I look at?
    Are there (very) cheap light splitters or combiners available?
   
    It's indirectly PIC related  -> on the end of each IRDA is planned to
    be a PIC.
   
       Steve Lawther
   

1998\02\12@120015 by Keith Howell

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Steve Lawther wrote:
>
>      It's indirectly PIC related
> on the end of each IRDA is planned to be a PIC.
> PICs running IrDA? Are you sure they're up to it? I looked at the specs
once and went right off using IrDA. For one, it is too complex to be
simply described and implemented. I'd guess about as complex as a Zmodem
or TCP/IP driver. You require data buffers, and IRDA runs up to 115kBaud
(standard) or 4MBaud (enhanced). Fine for a typical PC, but not really
suited to consumer electronics like hi-fi, TV, etc.

A cleverer chap than I put some document on the net describing all sorts
of flaws in the protocol, entitled "101 reasons why IRDA should be
laughed out of the room" or similar. I suspect quite a few consumer
goods with IRDA ports just run as half- duplex RS232 ports.

Comments?

1998\02\12@140810 by Darryl Newberry

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>> PICs running IrDA? Are you sure they're up to it? I looked at the specs
[snip]
>of flaws in the protocol, entitled "101 reasons why IRDA should be
>laughed out of the room" or similar. I suspect quite a few consumer
>goods with IRDA ports just run as half- duplex RS232 ports.
[snip]

http://cesdis.gsfc.nasa.gov/linux/misc/irda-flaws.html

-dn

1998\02\12@184126 by Andrew Warren

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Keith Howell <spam_OUTPICLISTTakeThisOuTspamMITVMA.MIT.EDU> wrote:

> A cleverer chap than I put some document on the net describing all
> sorts of flaws in the protocol, entitled "101 reasons why IRDA
> should be laughed out of the room" or similar.

   It was written by Donald Becker; the actual title is "IrDA IrLAP
   Standard Critique, or Why IrDA Should Be Laughed Out of Town".
   You can find it at:

       http://cesdis.gsfc.nasa.gov/linux/misc/irda-flaws.html

   Mr. Becker has a lot of useful IRDA information on his web
   site... After you've read his critique, you can see the rest of
   it at:

       http://cesdis.gsfc.nasa.gov/linux/misc/irda.html

   -Andy

=== Andrew Warren - .....fastfwdKILLspamspam@spam@ix.netcom.com
=== Fast Forward Engineering - Vista, California
=== http://www.geocities.com/SiliconValley/2499

1998\02\13@055049 by Steve Lawther

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    Sorry to confuse,
   
    When I said IRDa, I meant IRDa compatible transceiver MODULES - I
    didn't mean that I was using the protocol! As darrylspamKILLspamBLAZIE.COM's link
    pointed out, the least stressful way to use IRDa Modules, is to make
    it look like a comm port (with a high bit error rate!), and forget the
    protocol
   
    The idea was to pipe the IR from a master transmitter to multiple
    slaves, and receive the answers back from the slaves combined on
    another fibre pipe. (a bit like 4 wire RS485 with 1 master, multiple
    slaves)
   
    Steve Lawther


______________________________ Reply Separator _________________________________
Subject:      Re: slightly [OT] - light pipes and IRDA
Author:  MIME:.....keithhKILLspamspam.....ARCAM.CO.UK at INTERNET-HUSKY
Date:    12/02/98 17:09


Steve Lawther wrote:
>
>      It's indirectly PIC related
> on the end of each IRDA is planned to be a PIC.
> PICs running IrDA? Are you sure they're up to it? I looked at the specs
once and went right off using IrDA. For one, it is too complex to be
simply described and implemented. I'd guess about as complex as a Zmodem
or TCP/IP driver. You require data buffers, and IRDA runs up to 115kBaud
(standard) or 4MBaud (enhanced). Fine for a typical PC, but not really
suited to consumer electronics like hi-fi, TV, etc.
   
A cleverer chap than I put some document on the net describing all sorts
of flaws in the protocol, entitled "101 reasons why IRDA should be
laughed out of the room" or similar. I suspect quite a few consumer
goods with IRDA ports just run as half- duplex RS232 ports.
   
Comments?
   

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