nRF connect fails precompiled application test

[timredfern]

I'm trying the first steps of the initial tutorial with the nRF5340 kit, from here:

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_gsg_ncs%2FUG%2Fgsg%2Ffirst_test.html

The nRF connect app does not allow me to erase & write the example app from the hex files.

I see this error in the log:

ERROR Could not fetch memory size of target devkit: Error: Error occured when get library info. Errorcode: CouldNotOpenDevice (0x4)
Lowlevel error: Unknown value (ffffff5e)

I am using the latest nRF connect application - I just downloaded it. 

INFO Using nrfjprog library 10.12.1, pc-nrfjprog-js 1.7.6

I am using OSX 10.15.7

[Carl Richard]

Hello! 

This may be caused by readback protection enabled on the nRF5340 device. Before trying again, please open the command line and call the following commands:

nrfjprog --recover --coprocessor CP_NETWORK
nrfjprog --recover

This disables the readback protection, as described in the Working with nRF53 Series documentation. 

Best regards,
Carl Richard

[timredfern]

Hi Carl, 

What steps do I follow to get the nrfjprog command line tool? This hasn't been included so far in the workflow I'm following. I have just installed the nrf connect desktop application.

It seems unlikely this is a problem with the dev kit? I just took it out of the box.

Tim

[Carl Richard]

Hi again!

It's a part of the nRF Command Line Tools package, that can be downloaded from here. My apologies for the unclear instructions..

The problem is likely not with the kit, however the readback protection may be enabled by default. It should be handled by the nRF Connect programmer app and I will forward an inquiry ti the developers about that. 

Best regards,
Carl Richard

[timredfern]

Hi Carl,

Hmm, no instructions with this download. Also people won't find it easy to install OSX command line tools as the package isn't signed by a registered developer.

The 2 commands both seem to do the same thing.

It worked though, thanks!

Tim

[Carl Richard]

Hi, Tim!

That's indeed concerning. I'll have forward the feedback to the developers. Anyway, glad to hear that it worked! 

Best regards,
Carl Richard