NVMC nrf51822

RE: NVMC nrf51822

RK — Thu, 30 Apr 2015 00:02:12 GMT

The configuration will only take effect after a reset, which means if you write one of the UICR registers which affects configuration, like XTALFREQ, CLENR0, that change will only take effect after a reset. The values written however are available for reading after the write has completed, like other non-volatile memory.

And it is indeed 32 x 32bit words, not much, and remember you can only change bits from '1' to '0' before you have to clear the whole area.

And of course you can write to flash if you prefer, that works too.

RE: NVMC nrf51822

Jose Xavier — Wed, 29 Apr 2015 20:10:48 GMT

Datasheet says the following: 6.1.2 Writing to User Information Configuration Registers UICR registers are written as ordinary non-volatile memory. After the UICR has been written, the new UICR configuration will only take effect after a reset.

RE: NVMC nrf51822

Susheel Nuguru — Wed, 29 Apr 2015 17:32:48 GMT

not really, they are available after when you finished writing to them.

RE: NVMC nrf51822

Jose Xavier — Wed, 29 Apr 2015 17:29:10 GMT

Can you confirm me that the data wrote on these registers are only available after a reset?

RE: NVMC nrf51822

Susheel Nuguru — Wed, 29 Apr 2015 16:30:09 GMT

nRF51822 comes with flash memory that is either 128KB or 256KB depending on which version you have. You cannot use NVMC to write user data on the code as writing to already written memory cannot be done without erasing aleast that page. you probably already know this.

There is limited amount of space on UICR that can also be used to store user data, I cannot remember how much but its atleast 32 registers as far as i remember.