RE: nrf52840 simple uart bootloader

Einar Thorsrud — Tue, 25 Feb 2020 08:19:26 GMT

Hi,

Yes, the protocol is documented in the bootloader modules documentation.

RE: nrf52840 simple uart bootloader

Fiske — Tue, 25 Feb 2020 01:21:17 GMT

Do you have any documents describing the communication protocol between the DFU and the firmware sender?

RE: nrf52840 simple uart bootloader

Einar Thorsrud — Mon, 24 Feb 2020 14:04:40 GMT

Hi,

Nordic does not provide documentation or an example of other bootloaders than what you find in the SDK. However, you could refer to selected parts of the SDK example bootloaders and use that together with your minimal bootloader:

You can refer to nrf_dfu_app_continue() as an example of how to copy in place the application.
If you use a SoftDevice, you will have the MBR. So this can be used to copy in place the SoftDevice or bootloader itself (nrf_dfu_mbr_copy_sd() / nrf_dfu_mbr_copy_bl())
You can refer to nrf_bootloader_app_start() and nrf_bootloader_app_start_impl() to see how to branch to the application.