Reading UICR value at runtime for NRF53

[drumpros]

Hi there,

i have previously used the NRF52 series in which i read UICR customer values at runtime using the NRF_UICR->CUSTOMER pointer. This was on the old sdk (15.3)

from what i can tell this global is not available on the new SDK V2? 

i am using the following command to write to the UICR:

nrfjprog -f nrf53 --memwr 0x01FF8300 --val 0xC0FFEE

is there a way to read/write at runtime? do i need to use NVMC? additionally, can i read the UICR values on the Network core from the application core?

Many Thanks

[Sigurd]

Hi,

The UICR on the app core is a secure peripheral, https://infocenter.nordicsemi.com/topic/ps_nrf5340/chapters/uicr/doc/uicr.html?cp=4_0_0_4_3_2

It's possible to read the UICR, but if are building your app as non_secure, then TFM does not support UICR reading out-the-box today. The method to add support for this is shown in this post for nRF9160,  RE: Programming and reading OTP but the same method applies for the nRF5340.

additionally, can i read the UICR values on the Network core from the application core?

No, not directly.

i am using the following command to write to the UICR:

nrfjprog -f nrf53 --memwr 0x01FF8300 --val 0xC0FFEE

Note that this is for the network core. (Might need to also need to use --coprocessor argument here)

[BrianW]

just to add point that confused me for a while : reading the UICR in a secure app (ie an app that is NOT 'ns' with the TFM) is possible just by accessing memory at 0x00FF8XXX but must be done as a 32 bit word read, not byte by byte!