Bootloader causes NRF52840 to stop advertising

[Shri1395]

Hi,

I am trying to program the bootloader for the nrf52840. I am trying to create a settings for the specific hex file, and then programming using the nrfjprog commands. But for some reason, whenever i upload the bootloader on top of the soft device and the program, the device stops advertising.

Here are the commands i am using:

 

nrfutil settings generate --family NRF52840 --application ..\Firmware\version\s140\armgcc\_build\nrf52840_xxaa.hex --application-version 2 --bootloader-version 2 --bl-settings-version 1 settingsV10.hex --no-backup

mergehex -m secure_bootloader\pca10056_ble\armgcc\_build\nrf52840_xxaa_s140.hex settingsV10.hex -o bootloaderV10.hex

nrfjprog --family NRF52 -e
nrfjprog --reset --program ..\..\components\softdevice\s140\hex\s140_nrf52_6.0.0_softdevice.hex --family NRF52 --sectoranduicrerase
nrfjprog --reset --program ..\Firmware\version\s140\armgcc\_build\nrf52840_xxaa.hex --family NRF52 --sectoranduicrerase
nrfjprog --reset --program bootloaderV10.hex --family NRF52 --sectoranduicrerase

[Turbo J]

You either have to flash the application with the bootloader or generate the "bootloader settings page" with "nrfutil" and flash it via debugger.

The bootloader should advertise itself as "DfuTarget" when running, with a different bluetooth address.

[Shri1395]

The problem is not the DFUTarget, advertising. The problem is, once i upload the soft device and application hex files along with the bootloader, or when i upload the package, the application stops advertising.

[Turbo J]

The bootloader won't run the application without the correct checksum in it settings page - which is written either during DFU or manually generated with nrfutil.

You can verify this behaviour with a debugger.

[Shri1395]

The debugger actually doesn't show up any problem. It programmes all three things without any problem. But, if you are saying, it needs a checksum, does it need to be generated separately, then merged with the settings file, and then, again merge that settings with the bootloader file?  

[Turbo J]

OK, I was blind: Your posted nrfjprog commands never flash the generated file

bootloaderV10.hex

You can also simply flash the settingsV10.hex with nrfjprog as the last step.

[Shri1395]

No that was a typing mistake. I've tried both bootloaderV10.hex and settingsV10.hex. they dont work with the application. The bootloader works i.e. it advertises when i switch it to bootloader mode, but the application does not work