Writing to UICR Customer Registers

[mmak]

Hi,

Just wondering if it is possible to configure the UICR Customer registers after erasing and flashing/programming the nrf52832. The hex file used to program the device consists of the dfu bootloader, the custom application, and softdevice s132 v7.0.1. The entire project is based on sdk 16.0.0.

I've read that a previously written UICR register cannot be written without erasing it (https://devzone.nordicsemi.com/f/nordic-q-a/7163/can-i-write-to-the-uicr-registers-with-a-segger-and-jlink), hence the question.

Also, just wanted to verify if Customer[0] can still be used for sdk16.0.0 and does not contain device type and revision information as specified here: https://devzone.nordicsemi.com/f/nordic-q-a/13030/trouble-writing-nrf52832-s-uicr--customer-through-j-flash

Thanks,

Matthew

[Jared]

Hi,

I've read that a previously written UICR register cannot be written without erasing it (https://devzone.nordicsemi.com/f/nordic-q-a/7163/can-i-write-to-the-uicr-registers-with-a-segger-and-jlink), hence the question.

 Yes, the UICR is not meant to be written to multiple times, but rather once during production. 

Also, just wanted to verify if Customer[0] can still be used for sdk16.0.0 and does not contain device type and revision information as specified here: https://devzone.nordicsemi.com/f/nordic-q-a/13030/trouble-writing-nrf52832-s-uicr--customer-through-j-flash

 Yes, the information in the linked thread is old and not valid anymore. The register is free to be used.

regards

Jared 

[mmak]

Hi Jared,

Thanks for the clarifying!

Me and my colleague will attempt to write custom bytes to the UICR customer registers with j-flash once the device has been flashed with our hex application. To my understanding, as long as the target address was not written prior during the initial flashing process, the custom bytes should be able to be written to the UICR customer registers.

Matthew

[Jared]

Hi,

Yes you can write to the UICR register if you have not already done it before during production.

regards

Jared