Hi Tom , Thanks , we did try the updated script from Veljko . It works though we have missing packets after a while ( as suggested in the forum we would play with the interpolation and decimation ) though the 2 USRP2s are directly connected .
We are still probing into the permissions issue as indicated though we ran with root permissions ( may be not in totality) , would keep posted on the later if we find something on the same Thanks again , /Regards On Wed, Feb 3, 2010 at 8:17 AM, Tom Rondeau <trondeau1...@gmail.com> wrote: > On Tue, Feb 2, 2010 at 4:34 PM, Anu000 <anupama.puro...@gmail.com> wrote: > > > > Hi, > > We did try the below command on two USRP2s coneected via a SMA Cable > (Tx-Rx) > > with freq = 25M however it returned the following error on both sides > > > > At Rx side it shows like the below - > > > > [r...@gnuradio1 ofdm]# ./benchmark_ofdm_rx.py -f 25M -d 256 > --fft-length=64 > > --occupied-tones=32 --cp-length=4 > > usrp: failed to find usrp[0] > > Traceback (most recent call last): > > File "./benchmark_ofdm_rx.py", line 210, in <module> > > main() > > File "./benchmark_ofdm_rx.py", line 199, in main > > tb = my_top_block(rx_callback, options) > > File "./benchmark_ofdm_rx.py", line 51, in __init__ > > self._setup_usrp_source() > > File "./benchmark_ofdm_rx.py", line 70, in _setup_usrp_source > > fusb_nblocks=self._fusb_nblocks) > > File "/usr/lib/python2.6/site-packages/gnuradio/usrp/usrp_swig.py", line > > 1699, in source_c > > return _usrp_swig.source_c(*args, **kwargs) > > RuntimeError: can't open usrp > > > > At Tx side - > > r...@gnu2 ofdm]# ./benchmark_ofdm_tx.py -f 25M -i 512 --fft-length=64 > > --occupied-tones=32 --cp-length=4 > > usrp: failed to find usrp[0] > > Traceback (most recent call last): > > File "./benchmark_ofdm_tx.py", line 217, in <module> > > main() > > File "./benchmark_ofdm_tx.py", line 190, in main > > tb = my_top_block(options) > > File "./benchmark_ofdm_tx.py", line 51, in __init__ > > self._setup_usrp_sink() > > File "./benchmark_ofdm_tx.py", line 66, in _setup_usrp_sink > > fusb_nblocks=self._fusb_nblocks) > > File > "/usr/local/lib/python2.5/site-packages/gnuradio/usrp/usrp_swig.py", > > line 2415, in sink_c > > return _usrp_swig.sink_c(*args, **kwargs) > > RuntimeError: can't open usrp > > > > May we request somebody to support us at the earliest to resolve the > above > > issue with either software or hardware . > > > > Thanks again, > > Anupama > > > This is because you do not have the right permissions set to talk to > the USRP2 as a non-root user. See the USRP2 FAQs on the GNU Radio web > page for how to fix this. > > Tom > -- Thanks & Regards, Anupama Purohit 972 697 8183 (M)
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