nrfjprog consumes 100% CPU power

[Ernestas Gruodis]

Hi, I'm programming via SWD nrf51822 chip using nrfjprog with nrf54L15-DK as programmer, with this script (Windows 10  or 11 OS):

ECHO OFF
nrfjprog --recover -f NRF51 > nul 2> nul
nrfjprog --family NRF51 --program some_fw.hex --chiperase --verify 
nrfjprog --rbp ALL --family NRF51  > nul 2> nul
nrfjprog --family NRF51 --reset > nul 2> nul

ECHO End

set /p DUMMY=Hit ENTER to continue...

Sometimes nrfjprog hangs, and in Task Manager I can see, that jlinkarm_nrf_worker process consumes all CPU resources. In such cases I end this process. This helps, but not convenient.

Is it possible to resolve this issue?

[Kenneth]

Hi,

Can you switch to nrfutil and check if you see the same problem there? 
https://www.nordicsemi.com/Products/Development-tools/nRF-Util

If you do, then try to explain how we can recreate it, so I can forward it internally to the team. Unfortunately we are not doing much maintenance on the nrfjprog anymore, since we recommend using nrfutil instead. The first you can do is execute "nrfutil self-upgrade" followed by "nrfutil upgrade device", then to program the nRF51822 you can try to call "nrfutil device --help" for a list of parameters.

Kenneth

[Ernestas Gruodis]

Thanks, tried nrfutil:

nrfutil device recover --family nrf51 --traits jlink
nrfutil device erase --family nrf51 --traits jlink
nrfutil device program --family nrf51 --traits jlink --firmware fw.hex
nrfutil device fw-verify --family nrf51 --traits jlink --firmware fw.hex
nrfutil device protection-set all --family nrf51 --traits jlink 
nrfutil device reset --family nrf51 --traits jlink

Works perfectly, hope no problems will occur.