James
Thanks for that, but that's just a code snippet for encoding..not a codec.
I am now up to speed on what bit translation goes on at each end, but the
ancoding and decoding of a packet is what I am interested in.

I am still trying to figure out how best to process a preamble header stream
to sync the bit time to (thereby catering for various bps rates), and adjust
the sample timer as reception proceeds to account for frequency drift.

I would like to send, say a 32 bit preamble (16 1-0 or 0-1 pairs), followed
by a header block of say 4 bytes (of 0-0 pairs) - which would signify the
start of actual data.

Then receive (in Manchester format of course!) two bytes which signifiy the
length of data packet.  Then process the bitstream, adjusting the clock as
we go.

I think the KEELOQ encoders send a similar pattern, but without the variable
data packet bytes.

Rgds
Les

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of James Newton. Admin 3
> Sent: 19 February 2002 23:12
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]:Manchester encoding/decoding routine examples please
>
>
> source= http://www.piclist.com/postbot.asp?id=piclist\2002\02\19\071218a
>
> Manchester codec for PIC's in the FAQ at
> http://www.piclist.com/techref/microchip/manchester.htm
>
> ---
> James Newton: PICList.com webmaster, former Admin #3
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