RE: nRF52840 SDK16 - OTA DFU - Application version

Vidar Berg — Mon, 19 Oct 2020 08:29:54 GMT

Hello,

[quote user=""]1. Can I use float numbers for versioning e.g 1.1[/quote]

Technically not a float, but you can specify the application version as a string instead of an integer value, see help text below.

nrfutil pkg generate --help

[quote user=""]2. What is the procedure if I want to initialize the version numbering (for example to downgrade from v.5 to v.1). I need to compile a new bootloader with new public key?[/quote]

Downgrades can be accepted by building the bootloader with NRF_DFU_APP_DOWNGRADE_PREVENTION disabled in sdk_config.h

[quote user=""]3. When I flashed the secure bootloader I was not asked to enter any version.. I just used nrfjprog -f NRF52 --program file.hex --chiperase -r to flash the softdevice and nrfjprog -f NRF52 --program file.hex -r to flash the bootloader. So, If I want to flash a new secure bootloader how I will increament its version? Is this something that is performed automatically by the system?[/quote]

The version numbers are specified when you generate Bootloader settings page. You can find instructions on how to generate it here: Combine application, bootloader and softdevice image - Bootloader setting

[quote user=""]4. How can I keep track of the current version of the application? I mean how could I know the current version of my application running on chip?[/quote]

It will be stored in the bootloader settings structure (nrf_dfu_settings_t) at the last flash page, so you can reference it with a pointer.

Best regards,

Vidar