DFU over BLE - Memory Requirements

[Mats N]

I am going to implement DFU over BLE in my nRF52832 project.
Since the size of my application + softdevice larger than half my memory size I wonder how the update is performed.

Do I need to have space available locally on my board for the whole DFU package in order to be able to update or can the update be performed more "stepwise"?

[Einar Thorsrud]

Hi,

The SDK bootloader will perform dual bank updated if there is enough space, otherwise it will perform single bank updates. In this case, the application will be deleted in the beginning of the upgrade procedure to make room for the new application. The SoftDevice is always upgraded with dual bank method, deleting the application first if necessary. See Dual-bank and single-bank updates for details.

[Mats N]

Allright! Thanks for the quick response!