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USRP - N300 RunTimeError

From: Niels van Etten
Subject: USRP - N300 RunTimeError
Date: Tue, 29 Jun 2021 15:33:25 +0200

Dear all,

I'm trying to run the Ettus N300 on GNU radio.
When I'm running GNU radio via: pybombs run gnuradio-companion, I get the following error when trying to run the USRP Source block:

[INFO] [UHD] linux; GNU C++ version 7.5.0; Boost_106501; UHD_3.15.0.0-62-g7a3f1516
[INFO] [MPMD] Initializing 1 device(s) in parallel with args: mgmt_addr=,type=n3xx,product=n300,serial=320C34D,claimed=False,addr=
Traceback (most recent call last):
  File "/home/niels/top_block.py", line 187, in <module>
  File "/home/niels/top_block.py", line 163, in main
    tb = top_block_cls()
  File "/home/niels/top_block.py", line 84, in __init__
  File "/home/niels/prefix-3.8/lib/python3/dist-packages/gnuradio/uhd/__init__.py", line 125, in constructor_interceptor
    return old_constructor(*args)
  File "/home/niels/prefix-3.8/lib/python3/dist-packages/gnuradio/uhd/uhd_swig.py", line 3298, in make
    return _uhd_swig.usrp_source_make(device_addr, stream_args, issue_stream_cmd_on_start)
RuntimeError: rpc::timeout: Timeout of 2000ms while calling RPC function 'get_num_xbars'

Note that uhd_usrp_probe works without warnings and also the UHD example:
/usr/local/lib/uhd/examples/rx_ascii_art_dft --args "master_clock_rate=125e6,mgmt_addr=,addr=" --freq 98.5e6 --rate 2.5e6 --gain 50 --ref-lvl="-50" --dyn-rng 90 --ant "RX2" --subdev "A:0", runs like a charm.

Anyone knows how to fix this?

Thanks in advance


Niels van Etten

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