Eric Blossom wrote: >> Since I've now tried this a few times >> doing things like: removing the antenna from one (and not the other), >> moving them far apart, etc. - I'm fairly certain this is a software >> problem, and not the correct results. > > OK. Just to be sure, are you explicitly specifying different mac > addresses in the calls to usrp2::make?
Yes - I have two command line arguments, and when I print out u2a->mac_addr().c_str() and u2b->mac_addr().c_str() I get the expected results. > >> I can post my code if that would be helpful - I'm hoping I'm just >> making some silly mistake with my calls to rx_samples, and the copy >> handler or something similar. > > Please post a link to your code. http://cspl.okstate.edu/index.php/Code/rx_mimo.cc >> E.g., should I be using different channel numbers? > > Nope, channel number zero is the only one you need. > >> I just updated the firmware on my USRP2's to r10377, and the fpga >> bitstream to r10183. >> > > Eric Somewhat more disturbing. I've turned off the 1Hz/1PPS, and I'm not getting errors from sync_to_pps() (i.e. it still thinks they are synchronized - even after power cycling). When I added the code to the copy handler to print out the timestamp, etc. from the frame/metadata, I still get identical timestamps being sent: i.e. when I run: ./rx_mimo -m 30:80 -n 30:81 -f 2.412G -d 128 -g 30 -N 500 -o test1.dat -O test2.dat -v -M LOCK_TO_SMA I get: USRP2 (A) MAC address: 00:50:c2:85:30:80 Daughterboard configuration: baseband_freq=2412500000.000000 ddc_freq=500000.000000 residual_freq=0.011176 inverted=no USRP2 (B) MAC address: 00:50:c2:85:30:81 Daughterboard configuration: baseband_freq=2412500000.000000 ddc_freq=500000.000000 residual_freq=0.011176 inverted=no USRP2 (A) using decimation rate of 128 USRP2 (B) using decimation rate of 128 Started streaming Receiving 500 samples test1.dat: Timestamp: 1423196227(0,9.15527e-05) 0 test2.dat: Timestamp: 1423196227(0,9.15527e-05) 0 test1.dat: Timestamp: 1423243734(0.000274658,9.15527e-05) 0 Stest2.dat: Timestamp: 1423243734(0.000274658,9.15527e-05) 0 S Copy handler called 2 times. Copy handler called with 2968 bytes. Elapsed time was 0.001 seconds. Packet rate was 3040 pkts/sec. Approximate throughput was 4.51 MB/sec. Total instances of overruns was 1. (A) Total missing frames was 254. (A) This is with no 1PPS, no 10Mhz reference signal, and the antenna on 30:80 was removed (installed on 30:81). I'm going to pull up wireshark to compare the frames I'm getting from each USRP2. Doug -- Doug Geiger Research Assistant Communications and Signal Processing Lab Oklahoma State University http://cspl.okstate.edu douglas.gei...@okstate.edu doug.gei...@ieee.org _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
