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 _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
