Will OTA DFU NRF51822 overwirte the whole flash region ?

[ambiych]

Hi everyone, I am working on an NRF51822 project which requires the use of non-volatile memory to store user profile (so I think either flash or external EEPROM). As far as I know, I can choose to perform OTA update on bootloader, softdevice and application files.

So, the problem is, can I specify a particular region of flash (application files, not the rest two) to be updated only, such that I can still keep my user profile in somewhere even after the DFU. Or in this condition, it is better to use an external EEPROM to prevent from accidentally erased ?

Thank you very much

[bjorn-spockeli]

You can configure the bootloader to retain the app data section, shown on this page on our Infocenter. In order to configure the bootloader to retain this section you have to set the

#define DFU_APP_DATA_RESERVED           0x0000

to the number of bytes(must be a multiple of the flash page size) you want to retain.

You'll find more information on this Infocenter page.

Best regards

Bjørn