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[Discuss-gnuradio] recording data from 2 USRP daughterboards simultaneou

From: Brent M. Ledvina
Subject: [Discuss-gnuradio] recording data from 2 USRP daughterboards simultaneously
Date: Tue, 21 Aug 2007 15:49:30 -0400


I am trying to record I/Q data from two daughterboards (currently a TVRX and a RFX400) on one USRP simultaneously. I have no trouble recording data from either of these daughterboards independently, but when I try to record data simultaneously, I receive the following error:


#./usrp_rx_cfile.py  -R A -d 10 -g 65 -f 491e6 data
usrp_open_interface:usb_claim_interface: failed interface 2
could not claim interface 2: Device or resource busy
usrp_basic_rx: can't open rx interface
Traceback (most recent call last):
  File "./usrp_rx_cfile.py", line 105, in ?
  File "./usrp_rx_cfile.py", line 61, in __init__
    self.u = usrp.source_c(decim_rate=options.decim)
  File "/usr/local/lib/python2.4/site-packages/gnuradio/usrp.py", line 248, in __init__
    fpga_filename, firmware_filename)
  File "/usr/local/lib/python2.4/site-packages/gnuradio/usrp1.py", line 1232, in source_c
    return _usrp1.source_c(*args)
RuntimeError: can't open usrp1


This seems to be an inability to open the USB port on the second call to usrp_rx_cfile.py. Is there a simple workaround to this problem?


Brent M. Ledvina
Assistant Professor 
Bradley Department of Electrical and Computer Engineering
Virginia Tech
Blacksburg, VA 24061
ph: 540.231.0656
Office Hours: T 1-3, W 11-12 

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