To enter dfu mode from application buttonless

[Anil Hegde]

Hi, 

I have been working on DFU ble update with nrf52840 DK.

Using the onboard buttons I'm able to go to DFU mode where as for our custom board there's no buttons and I need to switch from application to DFU mode without button press. 

I tried to update the structure variable s_dfu_settings.enter_buttonless_dfu using nrf_dfu_settings_write( ); function.

But not able to compile.....how do I proceed further , please suggest.

• Thank you.

[sudharsan]

Hi,

Please look at the following 

1. Have you built the bootloader code by enabling "#define NRF_BL_DFU_ENTER_METHOD_BUTTONLESS 1" in sdk_config.h

You don't need to change any lines in bootloder file...only you have to focus on sdk_config.h of bootloader code

There are few setting needs to be done in your application code as well as bootloader code.

Follow the below post which is having clear instructions about button as well as buttonless DFU process

Link: https://devzone.nordicsemi.com/nordic/short-range-guides/b/software-development-kit/posts/getting-started-with-nordics-secure-dfu-bootloader

Follow the below document also which I followed and it worked.

8623.Add-NordicSemiconductorDFU-to-SDKexample_AppNote_(UBX-19050198).pdf

Regards,

Sudharsan