Hello,
I know that this question has been asked in the past but I could not find any recent post about this topic, and there have been many updates to the SDK since the last asked one, so I hope it's okay to bring up this issue again.
I am trying to save a variable to non-volatile memory so that it's value will remain after a power cycle. This variable is not a constant and could change during runtime by user interference - the user will enter a new value to store over a UART interface. I am running my program with the s130 SoftDevice loaded.
I have been looking at the documentation for the nRF5 SDK V12.1.0, specifically, the documentation for the driver for the NVMC peripheral. It says on the page that the function nrf_nvmc_page_erase can be used to erase a page of the UICR. It takes an address of the page as an argument. I was able to use the function nrf_nvmc_write_word to write a 0 value to address 0x10001080 but I was unable to set it back to 0xFFFFFFFF by using the nrf_nvmc_page_erase function. The page address I passed to the nrf_nvmc_page_erase function was 0x10001080. That is the part I am unsure about - is the page address different from the address of a single memory block? Or am I doing something else wrong?
I figured that if a function exists to erase a page of the UICR, it must be possible. But I have gone through a lot of forum Q&As about this issue and everywhere, it said that I have to erase the entire UICR in order to clear it for re-use. Is that still the case? If so, what is my best bet for achieving my need of retaining a variable value upon losing power?
Thank you for your time.
Regards, Sid
