RE: writing UICR registers (Customer 0 and Customer 1) using JLINK or nrfjprog

Learner — Thu, 24 Aug 2023 08:54:20 GMT

Hi Daniel,

I am faced with a slightly different problem using nrfjprog when writing to the UICR customer[] register.

I want to write some values at production time in the UICR customer register such as device ID etc.... So, I do this

nrfjprog --memwr 0x10001080 --val 0x000AAE60 --verify

to write the device ID which is 4 bytes long and it works fine.

However, when I try to write a signed 16-bit data value to the next location in the customer register I am not sure how to do it?

nrfjprog --memwr 0x10001084 --val 0x0320 --verify

If I read the content of the customer register back I find both values occupy 4 bytes. see below,

:10108000B5B8001820030000FFFFFFFFFFFFFFFFC0

How do I tell nrfjprog to write only 'n' bytes and not 4 bytes each time?

Note, This operation is done at production time, just before flashing the application hex file into the target board.

Thank you.

Kind regards

Mohamed

RE: writing UICR registers (Customer 0 and Customer 1) using JLINK or nrfjprog

Daniel Veilleux — Wed, 28 Jun 2023 23:34:25 GMT

You can easily read (e.g. "nrfjprog --memrd 0x10001208") and write (e.g. "nrfjprog --memwr 0x10001208 --val 0x00") the UICR using nrfjprog. You can accomplish the same thing with JLink.exe but that approach requires you to manually manipulate NRF_NVMC->CONFIG.