nRF53 Device is Protected after programming and I cannot debug

[nsga333]

When i program our new nRF5340 based radio boards the program returns Device Protected for both cores on completion. It is also impossible to debug the board as my segger refuses to connect.

I found a case with a similar issue:

https://devzone.nordicsemi.com/f/nordic-q-a/75406/problem-to-debug-net-cpu-after-segger-update-and-new-nrf5340-chip?ReplySortBy=CreatedDate&ReplySortOrder=Descending

and have tried the suggested solution of:

put the following in the NET Code at the start of main:

NRF_UICR_NS->APPROTECT=0x50fa50fa;
NRF_CTRLAP_NS->APPROTECT.DISABLE=0x50fa50fa;

put the following in the  APP Code the start of main:

NRF_UICR_S->APPROTECT=0x50fa50fa;
NRF_CTRLAP_S->APPROTECT.DISABLE=0x50fa50fa;

This does seem to allow the debugger to connect, However i get a hard fault from the command.

Is there a suggested way around this issue?

[Sigurd]

Hi,

How are you flashing the device? With nrfjprog or west?

Take a look at the commands on this page on how to flash the image:

http://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.5.0/nrf/ug_nrf5340.html#programming-from-the-command-line

[nsga333]

Not I am using the Programmer built into nRF Connect and just drag the images in so I wouldn't expect an issue.

As soon as i program the device the nRF Connect programmer reports it as protected

[emag nioj]

 But in nrf5340 revision A it was working all very good. Debugging Net Core was very simple.

Now with revision D  i m wasting lot of time.  

i have added this 

NRF_NVMC_NS->CONFIG = (NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos);
while (NRF_NVMC_NS->READY == NVMC_READY_READY_Busy) {};
NRF_UICR_NS->APPROTECT=0x50fa50fa;
while (NRF_NVMC_NS->READY == NVMC_READY_READY_Busy) {}
NRF_NVMC_NS->CONFIG = (NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos);
while (NRF_NVMC_NS->READY == NVMC_READY_READY_Busy){};
NRF_CTRLAP_NS->APPROTECT.DISABLE=0x50fa50fa;

in NET core at main function

and this in APP main

NRF_NVMC_S->CONFIG = (NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos);
while (NRF_NVMC_S->READY == NVMC_READY_READY_Busy) {};
NRF_UICR_S->APPROTECT=0x50fa50fa;
while (NRF_NVMC_S->READY == NVMC_READY_READY_Busy) {}
NRF_NVMC_S->CONFIG = (NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos);
while (NRF_NVMC_S->READY == NVMC_READY_READY_Busy){};
NRF_CTRLAP_S->APPROTECT.DISABLE=0x50fa50fa;
NRF_CTRLAP_S->SECUREAPPROTECT.DISABLE=1;

so i m expecting  to attach the debug without problems but not.

So  HOW TO  DO?

Thank you!

[nsga333]

Hi emag nioj

How did you manage to get that to run - i got a hard failt as soonas i tried to set NRF_CTRLAP_NS->APPROTECT.DISABLE and NRF_CTRLAP_S->APPROTECT.DISABLE

Thanks

[emag nioj]

here i haven't hard fault i can check just because the uploaded firmware seems to work 

but the flash in net core when updated programmatically seems to be erased after, but i haven't a way to verify.

i m thinking to not continue i have other projects delayed 

[Sigurd]

This is handled by the start-up code:

https://github.com/zephyrproject-rtos/hal_nordic/blob/master/nrfx/mdk/system_nrf53_approtect.h

https://github.com/zephyrproject-rtos/hal_nordic/blob/master/nrfx/mdk/system_nrf5340_application.c#L233

https://github.com/zephyrproject-rtos/hal_nordic/blob/574493fe29c79140df4827ab5d4a23df79d03681/nrfx/mdk/system_nrf5340_network.c#L87

If you have a nRF5340 revision D, I recommend using NCS v.1.5.0, or higher, and make sure to use the latest version of nrfjprog.

[emag nioj]

hello thank you!

about nrfjprog

i have this error  ERROR: JLinkARM DLL not found. Please reinstall latest JLinkARM. 

how to reinstall?

this errr after the update.

[Sigurd]

Try uninstall Segger J-link, and then run the nRF Command Line Tools installer again,

https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-Command-Line-Tools/Download#infotabs