[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Discuss-gnuradio] Switch Freq when packet transmitting
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] Switch Freq when packet transmitting |
Date: |
Tue, 3 Jun 2008 21:07:20 -0700 |
User-agent: |
Mutt/1.5.17 (2007-11-01) |
On Mon, Jun 02, 2008 at 10:29:22PM -0400, KC Huang wrote:
> Hi:
> Lately, I have tried to modify tunnel.py to switch freq in the
> middle of packet transmitting. But I have two problems.
> 1. When I tried to switch freq in the same daughterboard, should I
> have to stop the original transmission thread(tb.start) and start a
> new thread with new freq? Or are there any way to change the setting
> without stop the original thread?
There's no need to stop the graph to change the frequency. Just call
the tune method like you do at initialization time.
> 2. Also, I wanna switch freq between different daughterboards, e.g.,
> switching between 400MHz and 2.4GHz. How should I do? I first tried
> to assign a string "B" to "options.tx_subdev_spec", but it turns out
> not a string format. If we don't assign the value to this options,
> how could we do to switch different daughterboard?
First, be sure you understand what's really going on and how the Tx
and Rx muxes work. See http://gnuradio.org/trac/wiki/UsrpRfxDiagrams
Also if you haven't already, it would be good to work through the
python tutorial http://www.python.org/doc, and look at the rest of the
python docs there as well.
The daughterboard objects (u._db) are instances of subclasses of
db_base.py (gr-usrp/src/db_base.py) To change from one side to the
other on the fly you need to configure the muxes properly.
Documentation on the muxes can be found in usrp/host/lib/legacy/usrp_standard.h
Search for set_mux. There are two classes that implement set_mux,
usrp_standard_rx and usrp_standard_tx. The arguments are interpretted
differently for each of them.
Eric