How Can I Store the Device Name that won't change after a firmware update ?

[Christos.Bou]

Hi,

We are trying to change the name of our BLE device of our solution with being always different for each device. The device name would be like a serial number that is unique to each device.

Our project has a bootloader and via this bootloader, we can update the firmware of the device.

The goal is to have the possibility to change the device name via a mobile app (which works) but this device name needs to not changed when the firmware is updated, like a variable that is store in a part of the NRF52 that is not erased.

Does anyone knows how to do that ?

Big thanks,

Chris

[Jørgen Holmefjord]

Hi,

You have two options for persistent storage: 

• UICR — User information configuration registers
• NVMC — Non-volatile memory controller (Flash)

UICR is likely the simplest option, but it is a bit limited in the number of available registers. Also note that in order to change the information in an already written UICR register, the whole UICR needs to be erased.

For storing in Flash, you can either manually set aside a page that will be used to store this information, outside of the Bootloader/application area, or use Flash Data Storage (FDS) to handle the storing of information for you. You should make sure to follow the instructions in Preserving application data, to make sure you do not loose data during application updates.

Best regards,
Jørgen