Well not and call it IrDA, and Not if you want to talk to other peripherals
other than your own. The 3/16 can be shapped by several mfrs chips which
shorten the pulses when you feed then the normal UART freq. Which is how a
UART works it samples at 16x the receive freq. But you can implement a
really thin variant of IrDA IrLAP and skip LMP

Kevin E. Dodd
Embedded Systems Consulting
kevindod@triax.com
503.684-3731 Reached at
541.753-3633


-----Original Message-----
From:   Havard  Torring [SMTP:ht@NEO.NO]
Sent:   Friday, May 08, 1998 12:03 AM
To:     PICLIST@MITVMA.MIT.EDU
Subject:        Re: IRDA ?? How to?

To implement a standard RS232 interface over a IRDA link is simple.
Although this means that you will drop all tha nasty SW layers associated
with IRDA, but if you don't care,...

Use the following setup:

PIC <---> TOIM3232 <--->TFDS3000

Both circuits from Temic.

Haavard.

-----------
At 23:29 07.05.98 PDT, you wrote:
>    IrDA has to be implemented in a Stack (See OSI) IrLAP(Link Access
protocol
>    handles most of the difficulties)- THen there is IrLMP which handles
the
>    connections. It can be very thin, but the trickiest part is that IrDA
>    pulses are 3/16th of the regular USART signals. I can help you some.
>
>It's always seemed to me (looking at it casually from far away) that it
>ought to be trivial to convert a software bit-banging serial routine to
the
>shorter pulses of IRDA.  Yes?  No?  I guess it would take a 16/3 faster
>processor or 16/3 more cycles, maybe (worst case?)
>
>BillW
>