Cannot connect to nrf52 development kit with nrfjprog

[Ben]

Hi, I am trying to program nrf52 (on board ), but I keep getting these error: $ nrfjprog -f nrf52 --program nrf52832_xxaa.hex --eraseall
ERROR: JLinkARM DLL reported an error. Try again. If error condition ERROR: persists, run the same command again with argument --log, contact Nordic ERROR: Semiconductor and provide the generated log.log file to them.

and this is my log:

nrfjprog --program nrf52840_xxaa.hex --chiperase --log nrfjprog verion 9.4.0

FUNCTION: open_dll. FUNCTION: open_dll. FUNCTION: enum_emu_snr. FUNCTION: enum_emu_snr. FUNCTION: enum_emu_snr. FUNCTION: enum_emu_snr. FUNCTION: connect_to_emu_with_snr. FUNCTION: connect_to_emu_with_snr. FUNCTION: connect_to_emu_without_snr. FUNCTION: enum_emu_snr. JLinkARM.dll OpenEx returned error 'Can not connect to J-Link via USB.'. FUNCTION: close_dll. FUNCTION: close_dll.

This should be so easy but it is making me crazy. I was able to program with nrf go studio in windows. But I am using linux system and would like to work with jrfjprog. I should mentioned that I have tried on PCA10040 and PCA10056. And I have installed segger as well.

Regards, Ben

[butch]

Just ideas: did you try just "nrfjprog --ids"? When I plug in the DK on Ubuntu, a window opens showing the USB "stick" so to speak and saying something like "JLink." I can't remember whether Segger JLink installation requires futzing with /etc/udev/rules.d/99-jlink.rules. Use something like "lsusb" to see whether the USB connection is proper.

[Ben]

@butch: Thanks for the reply. Yes, indeed the DK is discoverable with "lsusb". And also "nrfjprog -i " gives me the number of the on board jlink. But Whenever I want to write to the board I get those errors that I have posted.

[Ben]

@Daniel Wang: Thank you for suggestion. I add my username to dialout access pool. But still I am getting the same error. But as you mentioned, it is most probably the access right issue, but I dont know how to overcome that.

[butch]

Don't the dev-rules specify a permissions group? Did you installed nrfjprog while root? Try running nrfjprog as root, that would eliminate permissions theory.