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[Discuss-gnuradio] UHD Error

From: Kapil Borle
Subject: [Discuss-gnuradio] UHD Error
Date: Fri, 23 Aug 2013 21:03:44 -0400


I am trying to run benchmark_rx.py and the first time I execute it after booting up the PC, I encounter the error pasted at the end of this message. The error goes away when I try to run benchmark_rx again, but comes back again after rebooting and executing bechmark_rx. 
Some information about the PC
~$ uname -a
Linux ubuntu 3.5.0-23-generic #35~precise1-Ubuntu SMP Fri Jan 25 17:13:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04.3 LTS
Release: 12.04
Codename: precise

~$ gnuradio-config-info -v


Error Message:

~$ /usr/local/share/gnuradio/examples/digital/narrowband/benchmark_rx.py -m dbpsk -r 500000 -f 0.6e9 -a addr= --spec=A:0 -A TX/RX --rx-gain=20 -v -S 2
linux; GNU C++ version 4.6.3; Boost_104800; UHD_003.005.001-0-gf3a16983

Using Volk machine: avx_64_mmx

bits per symbol:     1
RRC roll-off factor: 0.35
FLL bandwidth:       6.28e-02
Timing bandwidth:    6.28e-02
Phase bandwidth:     6.28e-02
-- Opening a USRP2/N-Series device...
-- Current recv frame size: 1472 bytes
-- Current send frame size: 756 bytes

UHD Error:
    Control packet attempt 0, sequence number 1:
    RuntimeError: no control response, possible packet loss

UHD Error:
    Control packet attempt 1, sequence number 2:
    RuntimeError: no control response, possible packet loss

UHD Error:
    Control packet attempt 2, sequence number 3:
    RuntimeError: no control response, possible packet loss
Traceback (most recent call last):
  File "/usr/local/share/gnuradio/examples/digital/narrowband/benchmark_rx.py", line 141, in <module>
  File "/usr/local/share/gnuradio/examples/digital/narrowband/benchmark_rx.py", line 130, in main
    tb = my_top_block(demods[options.modulation], rx_callback, options)
  File "/usr/local/share/gnuradio/examples/digital/narrowband/benchmark_rx.py", line 57, in __init__
  File "/usr/local/share/gnuradio/examples/digital/narrowband/uhd_interface.py", line 190, in __init__
    freq, gain, spec, antenna)
  File "/usr/local/share/gnuradio/examples/digital/narrowband/uhd_interface.py", line 52, in __init__
    self.u = uhd.usrp_source(device_addr=args, stream_args=uhd.stream_args('fc32'))
  File "/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/__init__.py", line 121, in constructor_interceptor
    return old_constructor(*args)
  File "/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py", line 1699, in make
    return _uhd_swig.usrp_source_make(*args)
RuntimeError: RuntimeError: link dead: timeout waiting for control packet ACK


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