NRF52833 is locked every time after power reset

RE: NRF52833 is locked every time after power reset

Justin Gasprom — Wed, 21 Sep 2022 16:58:06 GMT

Thanks for suggestions mrono and Jared. Solved it, the problem was tricky Keil interface:

I always though that "Use latest installed version" in Device Startup properties would use the latest installed mdk version. (It is actually showing which version it is using in blank grey I was not paying enough attention)

Turns out it could be overwritten by "software packs" menu if "fixed" option is selected in it. So since I got 8.49.0 installed I always thought "use latest installed" would always give me 8.49.0, but it was actually using "8.44.1" as "fixed" because I was using a project from SDK example, ignoring latest installed 8.49.0.

Pretty much this blog post Jared shared is guiding through this process.

Device is now unlocked after power reset too. Thanks!

RE: NRF52833 is locked every time after power reset

Jared — Wed, 21 Sep 2022 11:57:50 GMT

Hi,

[quote user=""]

Questions:

1. What "2. Program code compiled with an MDK 8.45.0 or later" actually means? I had a hard time figuring this out. I assume MDK 8.45.0 is nRF MDK pack as found here. First of all there is no version for Keil 5 (my Keil is 5.36.0.0), so I tried downloading Keil 4 pack but it does nothing, code compiles with or without it and my code generation tab only provides these options:

[/quote]

Yes, that's the MDK. The MDK contains the header files, startup files, workaround for errata's etc that is necessary for working with our microcontrollers. You're correct, Keil µvision doesn't have that MDK version in the downloads list under pack installer, but you can download and install it manually from our webpage. Just follow the instructions in this blogpost.

[quote user=""]2. Am I doing something wrong so my device is locking after power reset? [/quote]

You're doing it correct but you have to download the correct MDK so that the fw part of the app protect is also unlocked.

Can you try to manually install the MDK and see if it fixes your issue?

regards
Jared

RE: NRF52833 is locked every time after power reset

mrono — Wed, 21 Sep 2022 07:34:38 GMT

[quote userid="6231" url="~/f/nordic-q-a/92157/nrf52833-is-locked-every-time-after-power-reset"]So what is exactly nRF MDK and how to use it? Is it usable with Keil 5?[/quote]

Yes, open Keil's Pack installer and install an updated nRF_DeviceFamilyPack. Or alternatively select the "Pack" version from the webpage.

Then use Keil's Select software packs tool to use the newly installed MDK.