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

[Eric Blossom]

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
> AI4NZ

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


Eric
K7GNU