RE: Transferring data over to external memory using DFU (SPI)

MartinBL — Mon, 18 Sep 2017 09:29:49 GMT

Hi,

What you are suggesting should be possible, but naturally you will have to modify the bootloader. Today our bootloader solution supports 4 "filetypes": Softdevice, Bootloader, Application, and Softdevice+Bootloader, so you will have to add support for your image files and make the bootloader store them in external flash instead of internal flash.

The DFU works like this:

The peer application unpacks the .zip-file.
The initialization .dat-file is transferred and stored in flash.
The new firmware .bin-file is transferred and stored in flash.
<- Insert implementation of transfer and storage of image files in external flash.
The nRF51 resets itself.
Bootloader verifies the received files.
Bootloader updates firmware and bootloader settings.