IrDA with PIC?

[JULIEN LAFFITTE]

hello
I know 16 bit PIC have built in IrDA function but I can't use this pic family for the moment.
I have searched for code for using directly IrDA transceiver (TFDU6300) without encoder/decoder chip but I don't find it. Does anybody have code for IrDA encoding/decoding?
thanks

[Rohit de Sa]

There are a few ways you can go about doing IrDA. One, like you mentioned, is using certain 16bit processors with built-in IrDA. Another is to use a hardware protocol handler like the MCP21xx family. This unloads all of the processing onto external hardware and presents your microcontroller with simple UART data. The last option would be to roll your own code to decode the protocol (ie you write the stack in software). This is the most tedious. I don't know if a CCS-based software stack has been developed.

You will have to write at least the IrPHY, IrLAP, and IrLMP, which are layers in the protocol, and then write one additional layer for actual data handling.

You may want to go through some of these while writing your stack:
Fundamentals of the Infrared Physical Layer: http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en012144
Resource: http://tldp.org/HOWTO/Infrared-HOWTO/index.html
Wiki: http://en.wikipedia.org/wiki/Infrared_Data_Association

Rohit

[Rohit de Sa]

This seems useful too:

http://www.ccsinfo.com/forum/viewtopic.php?t=32186&highlight=irda


One question - do you necessarily have to implement IrDA, or are you just looking for high speed IR data transfer? I ask because IrDA, like most other standardized protocols, has a lot of overhead that may be unnecessary in simple cases. If you just want PIC-to-PIC IR comms then you can look at http://avtanski.net/projects/lcd_serial/#DATA

Rohit