Module sdrplay3 not found

[edgomezg]

Hi everyone,
I've already installed gr-sdrplay3 and the API without any problem. However, when trying to execute gr-sdrplay3/examples/FM-Receiver-SDRplay with an RSPduo I get a ModuleNotFoundError: No module named 'sdrplay3'.
I'm using Ubuntu20.04 & GNURadio 3.9.3.

Can anyone help me with this?

The gnuradio console response:

Generating: '/home/user/Dev/gr-sdrplay3/examples/top_block.py'

Executing: /usr/bin/python3 -u /home/user/Dev/gr-sdrplay3/examples/top_block.py

Traceback (most recent call last):
  File "/home/user/Dev/gr-sdrplay3/examples/top_block.py", line 38, in <module>
    import sdrplay3
ModuleNotFoundError: No module named 'sdrplay3'

[fventuri]

The first thing I would try is just:

sudo ldconfig

since on some Linux distributions the ld cache needs to be refreshed when a new shared library is installed.

If that doesn't help, please try to run this simple Python script:

#!/usr/bin/env python3
import sys
print(sys.path)

it should print a list of directories (your Python 'path'); please go through them and make sure one of them contains a directory called sdrplay3 (in my case, on Fedora 35, the directory is /usr/local/lib64/python3.10/site-packages, but yours on Ubuntu 20.04 will likely be different).

If you do find that sdrplay3 directory in your Python path, please make sure it contains a shared library called sdrplay3_python.cpython-310-x86_64-linux-gnu.so (or something very similar, depending on the exact version of Python you are running there).

Finally, run the command ldd -r on that shared library; in my case here the full command would be:

ldd -r /usr/local/lib64/python3.10/site-packages/sdrplay3/sdrplay3_python.cpython-310-x86_64-linux-gnu.so

(but yours is going to be slightly different), and make sure it doesn't show any dependent library as 'not found' or other messages about 'undefined symbol'.

Hope this helps,
Franco

[edgomezg]

Solved, thank you!

Now, I'm having another issue when trying to use my RSPDuo.

When I first connect it I can find it by typyng lsusb as:
Bus 001 Device 008: ID 1df7:3020

However, when executing a flowgraph in gnuradio, my devide suddenly gets disconected and I receive this error:

gr::log :ERROR: rspduo0 - SDRplay device not found: 
Traceback (most recent call last):
  File "/home/radio/Dev/gr-radio_astro/examples/DSPIRA/DSPIRA_Spectrometer.py", line 754, in <module>
    main()
  File "/home/radio/Dev/gr-radio_astro/examples/DSPIRA/DSPIRA_Spectrometer.py", line 732, in main
    tb = top_block_cls()
  File "/home/radio/Dev/gr-radio_astro/examples/DSPIRA/DSPIRA_Spectrometer.py", line 236, in __init__
    self.sdrplay3_rspduo_1 = sdrplay3.rspduo(
RuntimeError: sdrplay device not found or invalid mode/antenna selection

And after that, lsusb doesn't find the devide.

I would appreciate your help, thank you so much

[fventuri]

@gom-4 This is very strange; I've seen a few cases where the service sdrplay_api crashes, but I've never seen a case where the USB device disappears altogether like you have.

I would like to see if there's any error message from the SDRplay API in the logs.
These are the steps to look for possible error messages:

• in the RSPduo block in GRC, under 'Properties -> Other Options', enable the property called SDRplay API debug mode (DEBUG)
• save and run the GRC flowgraph until it gives you that error
• run these commands to search for messages from the service sdrplay_apiService in the logs:

grep sdrplay_ /var/log/messages

journalctl -b | grep sdrplay_

I hope that the messages in those logs will give us a better idea of the reason for this problem.

Franco

[edgomezg]

Hi Franco,

The problem was caused by my virtual machine USB configuration. Finally managed to solve it changing the controller.

Thank you for your help and congratulations on your great work.