Replacing nrfjprog with JLinkExe

RE: Replacing nrfjprog with JLinkExe

Håkon Alseth — Thu, 18 Jun 2020 06:41:00 GMT

Always happy to help!

Cheers,

Håkon

RE: Replacing nrfjprog with JLinkExe

PB — Wed, 17 Jun 2020 19:44:13 GMT

Thank you for your help!

RE: Replacing nrfjprog with JLinkExe

Håkon Alseth — Tue, 02 Jun 2020 08:53:09 GMT

Hi,

[quote user="PB"]Regarding this part I've found that i can just erase everything with JLinkExe without clearing RBP which first confused me since nrfjprog can't do that but on the other hand it makes some sense since it's erasing and not reading the memory contents. I will read more on the references you provided to understand it better because maybe i just didn't reset after rbp all so the setting didn't latch.[/quote]

Sounds like you haven't reset the device after writing to APPROTECT or that JLink recovered it for you.

Some versions of JLink Commander might also unlock the device, which should be in the log file:

Connecting to target via SWD
InitTarget() start
Device will be unsecured now.

The above is performed using JLink v6.64b, where it automatically unlocked the device (ie: erased it).

Kind regards,

Håkon

RE: Replacing nrfjprog with JLinkExe

PB — Tue, 02 Jun 2020 08:17:10 GMT

Hello Håkon,

Thank you for pointing me for your answers.

[quote userid="2115" url="~/f/nordic-q-a/62020/replacing-nrfjprog-with-jlinkexe/252615"]need to provide the equivalent to "nrfjprog --recover" in order to unlock the device[/quote]

Regarding this part I've found that i can just erase everything with JLinkExe without clearing RBP which first confused me since nrfjprog can't do that but on the other hand it makes some sense since it's erasing and not reading the memory contents. I will read more on the references you provided to understand it better because maybe i just didn't reset after rbp all so the setting didn't latch.

Is it a good idea to mix flashing with JLinkExe and later applying RBP with nrfjprog? Because on the outside everything seems great so far. I'm just worried that some register normally written by nrfjprog won't get written by JLink script and I'll learn that late in the process of flashing 🙂 and have to redo everything from the beginning.

RE: Replacing nrfjprog with JLinkExe

Håkon Alseth — Tue, 02 Jun 2020 06:27:54 GMT

Hi,

For nRF52832, the equivalent to "nrfjprog --rbp ALL" is writing to this register:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/uicr.html?cp=4_2_0_13_0_61#register.APPROTECT

You should do a reset afterwards in order to latch the new setting

Note that you need to provide the equivalent to "nrfjprog --recover" in order to unlock the device, which you can find posted in this thread:

https://devzone.nordicsemi.com/f/nordic-q-a/12484/approtect-and-dap

Kind regards,

Håkon