Pattern for Writing to UICR while Soft Device Enabled

[koniho]

I have a case where a module that can perform bit clears in the UICR needs to execute while a Soft Device is present and enabled.

I am aware that any direct flash access to the UICR while the Soft Device is enabled will result in a hard fault.

I can temporarily disable the Soft Device via softdevice_handler_sd_disable() and later re-enable via softdevice_enable() but the approach seems heavy handed. Is there a cleaner way to approach this problem?

In SDK V12.2.0 I found that there are new functions available softdevice_handler_suspend() and softdevice_handler_resume() but it does not appear that this will prevent hard fault when writing to flash.

I noted in Question 39317 that there was a possibility of allowing sd_flash_write() to access UICR region. Is there any update on if that capability is available?

[FormerMember]

Unfortunately, the functionality for writing to UICR while the softdevice is enabled will not be implemented.

[Collin]

Is this the case in SDK 13.0.0 as well? I would like to use the UICR customer registers, but am running into the hardfault problem. If I reset the MCU, the data is written (not trying to erase, just write the erased page with data). Still, I would like a way to write without having to reset via hard fault.

[FormerMember]

Instead of writing to UICR, you can write to flash, using for example FDS.