nRF52833 not going into DFU when setting GPREGRET

RE: nRF52833 not going into DFU when setting GPREGRET

jerome.sc — Wed, 26 Apr 2023 13:38:18 GMT

Ok, I figured out what was wrong. It was my sdk_config.h file. Previously, I was using the Nordic DFU Service, but was switching to a button based approach. I kept these two definitions to set.
NRF_SDH_BLE_SERVICE_CHANGED
NRF_DFU_BLE_REQUIRES_BONDS

RE: nRF52833 not going into DFU when setting GPREGRET

Einar Thorsrud — Wed, 26 Apr 2023 12:48:11 GMT

I see. Which changes have you made to your bootloader project compared to the unmodified one from the SDK? Can you upload a diff here where you diff everything, including the project files (so not just the source files)?

RE: nRF52833 not going into DFU when setting GPREGRET

jerome.sc — Wed, 26 Apr 2023 12:14:48 GMT

I also merged the files with my main application, softdevice etc and the debug version works. However, if i use the hex file of the sercure_bootloader_ble_s113_pca10100 it doesn't work.

RE: nRF52833 not going into DFU when setting GPREGRET

jerome.sc — Wed, 26 Apr 2023 12:02:14 GMT

I just tested the debug version, and it works. But the non-debug version doesn't. This is purely running the example codes, but changing the dfu_public_key.c file. This however, is the same for both versions.

RE: nRF52833 not going into DFU when setting GPREGRET

Einar Thorsrud — Wed, 26 Apr 2023 11:54:39 GMT

Hi,

Everything look OK here as far as I can see. Can you test with the debug bootloader with RTT logging? That prints a lot of information during boot including reasons for entering / not entering DFU mode, so that might give some hints. You can then also easily add additional logging in the bootloader to know more, like reading and printing the GPREGRET value when entering the bootloader.