pynrfjprog 10.15.4 fails with -254 INTERNAL_ERROR

Question

I am so happy the latest command line tools finally support the Apple M1 chip natively. Thanks again!

Now I was updating our production scripts to python3 and the latest pynrfjprog too, but it kept failing,

So I checked if the examples work, and the LowLevel ones failed very early on:

Python 3.9.7 (default, Oct 12 2021, 22:38:23) 
[Clang 13.0.0 (clang-1300.0.29.3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from pynrfjprog import LowLevel
>>> api = LowLevel.API('NRF52')
>>> api.open()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/homebrew/lib/python3.9/site-packages/pynrfjprog/LowLevel.py", line 185, in open
    raise APIError(result, error_data=self.get_errors())
pynrfjprog.APIError.APIError: An error was reported by NRFJPROG DLL: -254 INTERNAL_ERROR.

However HighLevel seems to work well:

from pynrfjprog import HighLevel

api = HighLevel.API('NRF52')
snrs = api.get_connected_probes()
print(snrs)

[81480416]

Any ideas?

By the way, your documentation here needs to be updated: infocenter

The fourth line fails:

from pynrfjprog import HighLevel
api = HighLevel.API(‘NRF52’)
api.open()
api.connect_to_emu_without_snr()

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'API' object has no attribute 'connect_to_emu_without_snr'

I assume that was supposed to be a LowLevel.API() example?

thefool · Accepted Answer

OK, I was able to verify your suspicion: sudo chmod +x /opt/homebrew/lib/python3.9/site-packages/pynrfjprog/lib_x64/*.dylib 
sudo chmod +x /opt/homebrew/lib/python3.9/site-packages/pynrfjprog/lib_x64/jlinkarm_nrf_worker* 
 fixed the issue and 10.15.4 now works. I guess you can rebuild the pip package with update permissions ;-) 
 Thanks again for following up!

thefool · Answer

Thanks! 
 Karl Ylvisaker said: It is strictly a wrapper for the Segger JLink nrfjprog dynamic link libraries, which it depends on to handle the low level communication with the device. 
 Excellent. Then installing nRF Command line tools 10.15.4 and pynrfjprog 10.15.0 is still a good workaround that works on the M1 natively ;-) 
 pip install pynrfjprog==10.15.0 
 for anyone else reading this.

pynrfjprog 10.15.4 fails with -254 INTERNAL_ERROR

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