nrf52833-dk read protection

RE: nrf52833-dk read protection

Sigurd — Thu, 13 Oct 2022 14:21:23 GMT

[quote user="Gaston"]Ok, thanks works now.[/quote]

Great!

[quote user="Gaston"]But wouldn't it be a good idea to update the SDK of tread and zigbee with this latest mdk?[/quote]

Ideally, yes, but our main focus is now on nRF Connect SDK. See this post for more information: nRF Connect SDK and nRF5 SDK statement

RE: nrf52833-dk read protection

Gueston — Thu, 13 Oct 2022 13:24:08 GMT

Ok, thanks works now.

But wouldn't it be a good idea to update the SDK of tread and zigbee with this latest mdk?

RE: nrf52833-dk read protection

Sigurd — Wed, 12 Oct 2022 15:41:43 GMT

[quote user="Gaston"]how can I see which MDK version this uses[/quote]

You can see that in <sdk root folder>/modules/nrfx/mdk/ in the nrf.h file. E.g.

/* MDK version */
#define MDK_MAJOR_VERSION 8
#define MDK_MINOR_VERSION 40
#define MDK_MICRO_VERSION 3

[quote user="Gaston"] And how can I update the MDK?[/quote]

Take a look at this post how to update MDK to handle APPROTECT

RE: nrf52833-dk read protection

Gueston — Wed, 12 Oct 2022 12:30:24 GMT

I use nRF5_SDK_for_Thread_and_Zigbee_v4.1.0, how can I see which MDK version this uses? And how can I update the MDK?

RE: nrf52833-dk read protection

Sigurd — Wed, 12 Oct 2022 11:58:00 GMT

Hi,

[quote user="Gaston"]I also read "Firmware must write APPROTECT.DISABLE to SwDisable", but I can't find the APPPROTECT register. How can I write SwDisable to this register?[/quote]

If you use the latest SDK version, this will be handled for you by the MDK startup code. If you are using an older SDK version, and don't want to update the SDK version, then please update the MDK version instead. We have also have an Informational Notice about the changes here https://infocenter.nordicsemi.com/pdf/in_149_v1.1.pdf?cp=18_13

RE: nrf52833-dk read protection

Gueston — Wed, 12 Oct 2022 09:18:04 GMT

Oh, I didn't know that has changed. I need to use --sectoranduicrerase because I only want to flash a certain area of the flash.

However, after a reset it's still protected.

I read that I need to disable it in the firmware, but when I type this NRF_UICR->APPROTECT=0x5A; it's still not disabled after reset.

I also read "Firmware must write APPROTECT.DISABLE to SwDisable", but I can't find the APPPROTECT register. How can I write SwDisable to this register?

I already spend a couple hours on this to fix it, I personally don't like this change that nordic made to enable rbp it by default. Would have been better to disable it and the with programming enable it, like I always do.

RE: nrf52833-dk read protection

Sigurd — Tue, 11 Oct 2022 11:48:59 GMT

Hi,

You likely have nRF52833 with build code Bxx(or later). Access port protection is enabled by default on these latest revision(s). You can find some more info about this here: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf52833%2Fdif.html&cp=4_1_0_3_7_1&anchor=concept_udr_mns_1s

Try to program the chip like this:

nrfjprog -f nrf52 --program [name_of_file].hex --recover