Can not DFU after merge Bootloader setting, bootloader and application

[nguyen huy]

Hi, 

I wanna  my appication run first instead of bootloader. Here is my steps:

Create bootloader_setting: nrfutil settings generate --family NRF51 --application application.hex --application-version 1 --bootloader-version 1 --bl-settings-version 1 bootloader_setting.hex --no-backup 

Merge bootloader and bootloader_setting: mergehex --merge bootloader_setting.hex bootloader.hex --output output.hex

Merge output.hex and appication.hex: mergehex --merge  output.hex  and appication.hex --output combine.hex 

Then i flash combine.hex

i am sucessful to run application instead of bootloader but when i start DFU, i stuck in connection like image

Is there anything wrong in my steps? 

[Vidar Berg]

Hello,

It looks like the device is failing to enter DFU mode from the application. Have you tried the same with the Experimental: Buttonless DFU Template Application to see if it works then?

[nguyen huy]

Yes, i tried this example and was successful.   

[Vidar Berg]

Ok, thanks. So that indicates that something must be missing in your Buttonless DFU integration. Are you able to share your project here so I can take a look at it?

[nguyen huy]

oh, it seems that my application has some problems, i will check it again 

[nguyen huy]

hi, after checking agian my application. I found that i am using WDT and if i increase WDT reload value, the application works fine. But i don not understand, can you help me explain? 

[Vidar Berg]

I assume you got a WD reset because it was not reloaded in time. Where and when are you feeding the timer, and what was the timeout set to?