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