NRF52840 RESET Pin stuck at LOW

RE: NRF52840 RESET Pin stuck at LOW

tejaChintalapati — Thu, 05 Mar 2020 08:28:54 GMT

This helped me fix the issue. I unbricked the board and everything is working the way it should.

Thanks, Kenneth for all the help.

RE: NRF52840 RESET Pin stuck at LOW

Kenneth — Wed, 04 Mar 2020 14:15:48 GMT

That is an old version, the latest is 10.6.0. Try it from here:
https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-Command-Line-Tools/Download

RE: NRF52840 RESET Pin stuck at LOW

tejaChintalapati — Wed, 04 Mar 2020 13:33:50 GMT

Hi Kenneth,

Here's the version:

nrfjprog version: 8.5.0
JLinkARM.dll version: 6.44g.

I only have 1 programmer connected to PC.

RE: NRF52840 RESET Pin stuck at LOW

Kenneth — Wed, 04 Mar 2020 12:40:39 GMT

What does it say if you type "nrfjprog --version"? Can it be that you have more than 1 jlink programmer and/or nRF board (DK/dongle etc) connected to your PC?

Kenneth

RE: NRF52840 RESET Pin stuck at LOW

tejaChintalapati — Wed, 04 Mar 2020 12:17:56 GMT

I did try running "nrfjprog --family nRF52 --eraseall". But, I am getting this error:

"ERROR: The --family option given with the command (or the default from nrfjprog.ini)
ERROR: does not match the device connected."

RE: NRF52840 RESET Pin stuck at LOW

tejaChintalapati — Wed, 04 Mar 2020 12:13:54 GMT

Hi Kenneth,

Thanks for responding. Here are my responses:

I have a standard 10 pin SWD connector.
I can't set the correct "Family" to run nrfjprog --readuicr dump_uicr.hex. The default is set to NRF51 in nrfjprog.ini and I can't seem to modify it - I am getting some Windows Error saying I don't have enough privileges. Can you please tell me how to set the family while running this command?
I can't run nrfprog --eraseall either because of incorrect family setting.

Can you please tell me how to change the family using the commands?

RE: NRF52840 RESET Pin stuck at LOW

Kenneth — Wed, 04 Mar 2020 12:04:51 GMT

Which pins have you connected between your board and J-link? It should be sufficient to connect gnd, vdd, swdclk and swdio.

Also, if you open a command line window you can call 'nrfjprog --readuicr dump_uicr.hex' when failling, I just want to check if UICR still have pin reset enabled after all your changes.

To completely erase a board you can call 'nrfjprog --recover' or 'nrfjprog --eraseall'.

Best regards,
Kenneth