So my problem is the switching between sending and receiving modes. How do I switch back to "receiving" mode after sending the data? Is it possible to do this automatically with the ATR controller? If yes, how do I have to setup the ATR registers? The values are handled outside the fpga (if I understood that right) and so I don't know the meaning of these values.
The ATR registers control the state of all 32 GPIO pins. There are 4 ATR states idle, rx, tx, and both. By setting these registers correctly, you can get GPIOS and hence, the antennas to switch when the ATR state in the FPGA changes.
For inspiration: this is the usrp2-gnuradio xcvr firmware where the atr controls the antenna: http://gnuradio.org/cgit/gnuradio.git/tree/usrp2/firmware/lib/db_xcvr2450.c#n310
Here is the host-based UHD implementation: http://ettus-apps.sourcerepo.com/redmine/ettus/projects/uhd/repository/revisions/master/entry/host/lib/usrp/dboard/db_xcvr2450.cpp#L229
And some app notes if helpful: http://www.ettus.com/uhd_docs/manual/html/dboards.html#xcvr-2450 Thanks, -Josh _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
