[Discuss-gnuradio] UCLA Zigbee PHY examples updated for UHD

[Kresimir Dabcevic]

Hello list!

I've updated (or at least tried updating) two of UCLA ZIGBEE PHY project's examples to work with UHD - cc2420_txtest.py and cc2420_rxtest.py. I think the tx one works fine (spectrum analyzer says that we truly are transmitting at the given frequency), however the rx example isn't receiving/decoding packages. Could someone take a look at the modifications to see what I'm doing wrong (maybe I am setting the frequencies/some other parameters wrong - does using self.u.set_center_freq function suffice, or should I somehow be tuning the frequency - if so, how?)?

It seems that the variable self.rcvd_pktq is empty (line 258 in ieee802_15_4_pkt.py):
(part of the code where we fill up the "msg" variable):
    def run(self):
        while self.keep_running:
            print "802_15_4_pkt: waiting for packet"
            msg = self.rcvd_pktq.delete_head()
            ok = 0
            payload = msg.to_string()
            print "received packet "


It confuses me why we aren't receiving packets (especially since the cc2420_channel_test.py works fine).

This is the output of uhd_cc2420_rxtest.py (regardless whether I'm running the uhd_cc2420_txtest.py on the other machine or not):

address@hidden:~/ucla_zigbee_phy/src/examples$ ./uhd_cc2420_rxtest.py -c 2450000000 -r 100 -A TX/RX -g 20 -f rxtest.dat
linux; GNU C++ version 4.4.5; Boost_104200; UHD_003.001.000-9f1e49e

Blocked waiting for GDB attach (pid = 5466)
Press Enter to continue:
cordic_freq = 2.45G
data_rate =  100
samples_per_symbol =  2
fs =  200
-- Opening a USRP2/N-Series device...
-- Current recv frame size: 1472 bytes
-- Current send frame size: 1472 bytes
-- mboard0 is MIMO master
Center frequency: 2450000000
>>> gr_fir_fff: using SSE
802_15_4_pkt: waiting for packet
  Statistics: good 0 received 0


I've been using two USRP N210s (also tried on only one with TX/RX as transmitter and RX2 as receiver - same thing) for testing with gnuradio3.3.0 on Ubuntu 10.10

Links to files:
http://marvin.kset.org/~sunshine/uhd_cc2420_rxtest.py
http://marvin.kset.org/~sunshine/uhd_cc2420_txtest.py

Regards,
Kresimir