UICR Serial Number + DFU Compatibility SDK 15.2

[JeffW]

Using softdevice 6.1.0 and SDK 15.2:

Is it safe to use NRF_UICR->CUSTOMER[0] through CUSTOMER[5] for storing serial numbers?

It seems through in previous versions of SDK/SD/DFU some of these UICR registers were used for doing DFU.

Thanks,
Jeff

[AndreasF]

Hi.

As long as the SoftDevice is enabled, it's not possible to write to UICR. Ref [0], [1]

You can write if you have disabled the SoftDevice.

Best regards,

Andreas

[JeffW]

Andreas,

Thanks for the response. I was intending to program UICR at factory.
Looking at compiled hex images, it seems like DFU uses UICR->NRFFW, and not the CUSTOMER specific bits.
Please let me know if my conclusion is wrong. 
Thanks,
Jeff

[Nguyen Hoan Hoang]

You can use CUSTOMER with DFU no problem.