Re: [Discuss-gnuradio] Changing frequency dynamically in benchmark_rx.py

[Tom Rondeau]

Jason Uher wrote:
> > would like to know where is this happening in the code? tb.wait() is called,
> > but i don't see the code in wait() function which actually senses if a
> > transmission is being carried out on the specified frequence or not? Can
> > someone please help me locate the transmission sensing code in
> > benchmark_rx.py?
> >     
>
> tb.wait() only allows the previously defined flowgraphs to do their
> work.  You need to look in the tx_path and rx_paths that are built
> before tb.wait() is called
>
> Jason

Yes.

In rx_path you will see the demod path. If you follow this down far 
enough, you'll come to the simple framer block. This pulls in bits and 
correlates it against the known access code. If the correlation hits, it 
then goes through and packs together the frame. When the frame is built 
(it knows this because it gets the frame's length after the access 
code), it sends it as a message to the callback function defined. The 
callback function is located in benchmark_rx.

Hope that gets you going.

Tom