I hate to tell you this, but IrDA is not implemented very easily. This
protocol requires 4 distinct layers, 1 of which is the Physical Layer which
you have there. Usually the BIOS implements the IrDA port as a extension of
the Serial port. The pulses used for communication on IrDA is 3/16 of a
normal pulse, and inverted(on is a 0).

        After you have this layer, there are 3 more:
IrLap- link access protocol
IrLmp- Link Multiplexor
IrTinyTp- A tiny transport layer(this is optional).

If you are interested you can write me, and I can try to help you, but the
sources are a little complex


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


-----Original Message-----
From:   Janusz J. Mlodzianowski [SMTP:fizjm@UNIV.GDA.PL]
Sent:   Thursday, March 19, 1998 4:50 AM
To:     PICLIST@MITVMA.MIT.EDU
Subject:        IrDA, USB and PIC/PC

Hi,
This is slightly off topic but I do hope someone could give me
some advice.
I am thinking about using IrDA and/or USB to communicate with
some peripherials possibly runing off PIC. Before I start designing
the hardware I would like to play with IrDA and USB alone.
I have a PC mainboard equipped with IrDA and USB connectors (pin headers).
The problem is that I could not find any info about accessing those
peripherials (BIOS support, I/O addresses, etc). What sort of hardware
is necessary to make an IR link. Would just TX,RX diodes and couple of
resistors do the job?
Thanks for any help
janusz