how to write data to UICR？

RE: how to write data to UICR？

Carl Sun — Wed, 03 Mar 2021 03:29:52 GMT

Hi, Einar,

I changed the command to:

nrfjprog -f nrf53 --memwr 0x00FF8100 --val 0x00010000

It works.

Thanks for your support.

Carl.

RE: how to write data to UICR？

Carl Sun — Wed, 03 Mar 2021 03:26:09 GMT

Hi, Einar.

In nRF5340 DK, I did this:

1. use nRF connect to "Erase all".

2. in power shell issued this two commands:

nrfjprog -f nrf52 --memwr 0x00FF8100 --val 0x00010000

nrfjprog -f nrf52 --memwr 0x00FF8000 --val 0x00010000

but I got error message, it seems I did write successfully.

What is the problem?

Thanks,

Carl.

RE: how to write data to UICR？

Einar Thorsrud — Tue, 02 Mar 2021 13:15:21 GMT

Hi Carl,

The UICR is just like any other flash memory, so you write it in the exact same way, for instance using nrfjprog like you suggest in your post. The only limitation is that the OTM emulation only allows writing once to each half-word, but that is generally no problem. You can see the available addresses under UICR in the product specification. Note that if you use some SDK modules that may also use some of the UICR OTP registers for other purposes (such as key storage in the immutable bootloader etc.) - if that is the case you should ensure no overlap.

As you can see from the PS, the UICR OTP registers for the app core starts at 0x00FF8100.

Einar