nRF52840 BLE DFU (OTA ) example

[Pony Ma]

Is there any example  for nRF52840 DFU?

Detail steps is better...

I want upgrade my firmware through nRF connect app...

[Amanda Hsieh]

Hi Pony, 

Please see the

Example: BLE Secure DFU Bootloader, Buttonless DFU Template Application 

Toturial: getting-started-with-nordics-secure-dfu-bootloader

-Amanda H.

[Pony Ma]

Refer to the website links you provided , I added DFU function to my project  ,it works .I could upgrade my firmware upon nrf-connect app.

There is another question : 

When I directly programed firmware to my borad  by MDK-arm, the ble name changed to "DFU-TARG"，it seems  startup with "bootloader" mode.

How to fix it ?

Thanks a lot.

[Amanda Hsieh]

Hi Pony, 

Do you generate bootloader setting and merge bootloader with bootloader_setting.hex as the tutorial?

-Amanda H.

[Pony Ma]

Yes，but MDK Program have no these steps

[Amanda Hsieh]

Hi Pony, 

May I know what are the commands you use to generate and flash the images?

You have to download nRF-Command-Line-Tools to generate bootloader_setting and merge the image. 

I usually do like this:

mergehex -m softdevice.hex bootloader.hex -o merged_SD_bootloader.hex
nrfjprog --program merged_SD_bootloader.hex --chiperase

nrfutil settings generate --family NRF52840 --application app.hex --application-version 1 --bootloader-version 1 --bl-settings-version 1 settings.hex
mergehex -m hrs_app.hex settings.hex -o merged.hex
nrfjprog --program merged.hex --sectorerase -r

When you generate the bootloader setting, you should use --family NRF52840 for nRF52840.

-Amanda H.