DFU to update third-party ECU

[YaroslavRakhnenko]

We would like to try using the standard DFU process to update third party ECU connected to the nrf52 chip.
Our idea is to modify the standard DFU zip package - to add a new parameter to the manifest.json, for example a motor controller:

Then, when receiving the contents of mcM221.hex, write it to external memory (SPI \ i2C FLASH) and perform all further actions.

I didn't find the parsing of the manifest file in bootloader. Until I dived into the depths of the code I would like to ask support if the scenario described is possible? If so, please let me know where can I find the code responsible for parsing the manifest.json file and processing the bin_file\dat_file?

PS: we're using softdevice ver 332

[Vidar Berg]

Hello,

If you use nRF5 SDK 15.3.0 or later and look at the source code, you should see that there is a FW update type called "External application". It's still an experimental feature, and documentation is lacking, but should be a good starting point for what you are trying to do.

sdk_config.h setting from nRF5 SDK 17.0.2

Do you expect Bank 1 on your device to be large enough to receive the full image before transferring it over SPI/i2c?

Bank 1 is the free area between main application and reserved application data/bootloader: