[USRP-users] USRP N310 Losing Connection Occassionally

Marcus D. Leech patchvonbraun at gmail.com
Sat Nov 23 17:55:29 EST 2019


On 11/23/2019 05:48 PM, Austin Adam wrote:
> Hey Marcus,
> Thank you for the quick response! This sounds like a good solution, 
> could you give some insight on how to go about doing it?
>
> Thank you so much!
The "head" block takes a number, which is the count of samples that it 
will allow through it before it declares "Done", and thus causes
   clean termination of your GR Script.


>
> On Sat, Nov 23, 2019 at 2:32 PM Marcus D. Leech via USRP-users 
> <usrp-users at lists.ettus.com <mailto:usrp-users at lists.ettus.com>> wrote:
>
>     On 11/23/2019 03:49 PM, Austin Adam via USRP-users wrote:
>>     I am trying to run a Gnu Radio python file via the terminal and
>>     only want to run in for a few seconds and then kill it. Then,
>>     wait a little bit, and rerun the script again. My problem is that
>>     sometimes, when I rerun it, I get an issue with my USRP N310 in
>>     that it decides to just disconnect with either a "No devices
>>     found for" or "Someone tried to claim this device again" message.
>>     I have posted the error messages below from two different instances.
>>
>>     When this happens, running uhd_find_devices does not find the
>>     N310, neither does uhd_find_devices --args=addr=192.168.10.2.
>>
>>     Upon restarting the N310 by manually pressing the power button,
>>     it is able to be found by uhd_find_devices, and I can continue
>>     running the script until the error happens, and I have to go
>>     manually restart the USRP.
>>
>>     I am trying to make an entire automated system and this is the
>>     one thing that requires manual effort, which is to get up and
>>     restart the USRP.
>>
>>     I am looking for a way to either, reboot the USRP via commands
>>     for when the error occurs, or a solution/workaround to the
>>     problem if it exists.
>>
>>     Is there any way to keep the USRP claimed and just tell the GNU
>>     part of the script to run each time I want to rerun it? Because
>>     each time I have to run the script, the USRP has to again be
>>     claimed and initiated. How can I keep it on at all times, or just
>>     skip the claiming step each time?
>>
>>     Thank you in advance for any help you can provide!
>>
>>     Here are the error messages:
>>     /[INFO] [UHD] linux; GNU C++ version 8.3.0; Boost_106700;
>>     UHD_3.14.0.HEAD-0-g6875d061/
>>     /Traceback (most recent call last):
>>       File "/home/ugikie/Desktop/PositionControl/ArrayTest2.py", line
>>     296, in <module>
>>         main()
>>       File "/home/ugikie/Desktop/PositionControl/ArrayTest2.py", line
>>     284, in main
>>         tb = top_block_cls()
>>       File "/home/ugikie/Desktop/PositionControl/ArrayTest2.py", line
>>     79, in __init__
>>         channels=range(4),
>>       File
>>     "/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/__init__.py", line
>>     122, in constructor_interceptor
>>         return old_constructor(*args)
>>       File
>>     "/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py", line
>>     2782, in make
>>         return _uhd_swig.usrp_source_make(*args)
>>     RuntimeError: LookupError: KeyError: No devices found for ----->
>>     Device Address:
>>         addr: 192.168.10.2
>>         rx_lo_source: external
>>         init_cals:
>>     BASIC|TX_ATTENUATION_DELAY|RX_GAIN_DELAY|PATH_DELAY|TX_LO_LEAKAGE_INTERNAL|LOOPBACK_RX_LO_DELAY/
>>     /
>>     /
>>     *Here is the second time it happened:*
>>     /[INFO] [UHD] linux; GNU C++ version 8.3.0; Boost_106700;
>>     UHD_3.14.0.HEAD-0-g6875d061
>>     [INFO] [MPMD] Initializing 1 device(s) in parallel with args:
>>     mgmt_addr=192.168.10.2,type=n3xx,product=n310,serial=3177E63,claimed=True,addr=192.168.10.2,rx_lo_source=external,init_cals=BASIC|TX_ATTENUATION_DELAY|RX_GAIN_DELAY|PATH_DELAY|TX_LO_LEAKAGE_INTERNAL|LOOPBACK_RX_LO_DELAY
>>     [ERROR] [RPC] Someone tried to claim this device again (From:
>>     192.168.10.1)
>>     Traceback (most recent call last):
>>       File "/home/ugikie/Desktop/PositionControl/ArrayTest2.py", line
>>     296, in <module>
>>         main()
>>       File "/home/ugikie/Desktop/PositionControl/ArrayTest2.py", line
>>     284, in main
>>         tb = top_block_cls()
>>       File "/home/ugikie/Desktop/PositionControl/ArrayTest2.py", line
>>     79, in __init__
>>         channels=range(4),
>>       File
>>     "/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/__init__.py", line
>>     122, in constructor_interceptor
>>         return old_constructor(*args)
>>       File
>>     "/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py", line
>>     2782, in make
>>         return _uhd_swig.usrp_source_make(*args)
>>     RuntimeError: RuntimeError: Error during RPC call to `claim'.
>>     Error message: Someone tried to claim this device again (From:
>>     192.168.10.1)/*
>>     *
>>
>>     i\
>     Instead of interrupting the GR script, you could use the "Head"
>     block to have it run for a finite number of samples, then exit
>     gracefully.
>       When you interrupt it, some things are clearly not getting
>     cleaned up gracefully.
>
>
>
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