How to write custom protocol

[Linuxbuilders]

Hey,
I need to write custom output protocol.

In short I will be driving outputs to stream wiegand protocol out.

I have no idea where to start. I know how wiegand works but I am not sure how to pass data to the functions.

I would create 2 functions/drivers: w_one(); and w_zero(); to map proper timing on Data and Strobe pins for logical 1 and logical 0.

Then how would I map it so I can pass my data to the function?
For example wiegand_out(DATA); which will be using above drivers?

here I would imagine this:
1. convert my byte to string of bits
2. send string of bits to output function
3. output function takes zero or one and brings up Data or Strobe as per wiegand standard

Any help on it?
Thnx in advance
_________________
Help "d" others and then you shell receive some help from "d" others.

[temtronic]

general comments..

first, search this forum and the code library for any 'hits' .Odds are you're not the only guy wanting to do this...

second, 'google' ! There will be a LOT of hits there as well.Maybe not in CCS C code but code is code...What is important is the timing specs, dta format,etc.By using the right 'keywords' Google might find a driver for you.

third, do you want to have your PIC mimic a card reader and send data to the host, or be the host and read data from the card reader? I've seen a lot of 'reading a card reader' code but not being a card reader.

4th, choose a PIC, build a prototype platform and program in the '1Hz flashing LED' and 'Hello PC' programs.This will confirm your hardware is working ! and you'll have a known starting point for the Wiegand interface/driver.

hth
jay