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.

[Pony Ma]

Sorry， I   mean: just press this button "load"

did not work. 

[Amanda Hsieh]

Hi Pony, 

Which SDK and example are you using?

Does it happen to other example projects?

What version of Keil are you using? Is the license available? 

Are you able to use nRF-Command-Line-Tools to program the image?

-Amanda H.