Bootloader does not start application

[seanbites]

Hello,

I am trying to get my device (nrf52832) to do DFU OTA, and to do so I am programming the bootloader before programming the s132 softdevice and the application. However, the device seems to stay stuck in bootloader mode without ever starting the application. I am able to perform a DFU using a test application, so the bootloader is indeed functionnal. I have tried merging the bootloader settings file at this location : here. If I only program the softdevice and the application, everything works well (except dfu).

This does not fix my problem. Do my settings have to be different than the ones found in this file? I have already looked through a dozen posts on this site and have yet to find a solution that works. I am using SDK 9.2 and Eclipse gcc. Any help would be greatly appreciated!

Thanks!

[Pavan kumar]

I think the meged hex settings are different than the board that you are using. Any how in order to jump from bootloader mode to application the controller first checks weather there is valid flag set or not in the location BOOTLOADER_SETTINGS. So once try to write the value 0x01 using jprog That may resolve the issue

[seanbites]

Could you explain what you mean by " So once try to write the value 0x01 using jprog That may resolve the issue "? Thanks!

[Pavan kumar]

Generally the bootloader initially checks weather a valid app is present or not in the DFU_BANK_0 by looking at the location BOOTLOADER_SETTINGS. If the p_bootloader_settings->bank_0 flag is set to 1. It assume that there is a valid app. generally it sets while doing dfu. So you can write this flag using jprog at location BOOTLOADER_SETTINGS. you can check bootloader_app_is_valid() function in bootoader.c for more info

[seanbites]

This worked really well thank you! If there are any others out there who need help on this, enter this command line for nrf52:
nrfjprog --family nrf52 --memwr 0x7F000 --val 1 and it is 0x3FC00 for nrf51

[Kyle Krueger]

When trying to enter this command I am receiving an error.

nrfjprog --family nrf52 --memwr 0x7F000 --val 1

Parsing parameters.

ERROR: The area to write is not erased.

Also, is there any reason this is not being automatically set when a DFU application update has been successful?