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Re: [Discuss-gnuradio] FM AFSK CRC16 HDLC example

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] FM AFSK CRC16 HDLC example
Date: Fri, 10 Mar 2006 09:53:56 -0800
User-agent: Mutt/1.5.9i

On Fri, Mar 10, 2006 at 10:25:12AM -0500, address@hidden wrote:

> Do python accessable routines exist in gnuradio to handle AFSK,
> CCITT-CRC16, and HDLC packets like we find in multimon and
> soundmodem?  I would like to expand the fm receiver example and
> listen to HDLC packets from a 1200bps modem through my soundcard
> like I do with soundmodem.
> Jim Clements

Hi Jim,

I'm pretty sure all the bits and pieces are there, but I don't think
anyone else has connected them together yet.  It would be great if you
did.  Given the low data rate, you could probably handle the HDLC
packet parsing and bit-stuffing/destuffing in python.  Or you could
write a new block to handle it in C++.

For a starting point, please take a look at the GMSK examples.
They're similar to what you want to do, only the bitrate is 500
times faster ;)

See especially:

  gnuradio-examples/python/gmsk2/benchmark_gmsk_tx.py, benchmark_gmsk_rx.py
  gnuradio-core/src/python/gnuradio/blksimpl/gmsk2.py, gmsk2_pkt.py


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