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

[Brent M. Ledvina]

Hi,

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 ?

    my_graph().run()

  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?

Regards,

Brent

----------------------------------

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