Difference between different HEX files found in build/zephyr folder of nRF Connect SDK project

[witch_mountain]

Hi all! 

I've been working on a project using the nRF Connect extension for VS Code and I've been trying to figure out which HEX file in my build/zephyr folder for my application I'm supposed to flash onto the Thingy 91? I'm asking based of this closed post from ~2 years ago.  Thingy 91 not connecting to VS studio 

I know I'm supposed to be looking for the app_signed.hex file but instead I have:

• b0_container.hex
• s0.hex
• s0_image.hex
• s1.hex
• signed_by_b0_s0_image.hex
• signed_by_b0_s1_image.hex
• signed_by_mcuboot_and_b0_s0_image_moved_test_update.hex
• signed_by_mcuboot_and_b0_s0_image_signed.hex
• signed_by_mcuboot_and_b0_s0_image_test_update.hex
• ssigned_by_mcuboot_and_b0_s1_image_moved_test_update.hex
• signed_by_mcuboot_and_b0_s1_image_signed.hex
• signed_by_mcuboot_and_b0_s1_image_test_update.hex

There's a lot more HEX files than expected and because this was from a few years ago I wanted to ask if what I'm looking for is under a different name? 

Thanks!

[Einar Thorsrud]

Hi,

Please see Output build files.

[witch_mountain]

Hi, 

Yes so I did look through that document before posting and tried those hex files and tired to rebuild to get the app_signed.hex file. I'm trying to flash my application onto the Thingy 91 device and it seems to not be working either through the programmer app or through VS Code. 

Thanks

[witch_mountain]

Also when I do rebuild I seem to be getting this error log:

[Einar Thorsrud]

Hi,

If the project never built successfully it is a separate matter that needs to be addressed. If the project did not build the file is never generated.

Assuming you are able to biuld the project and that consists of multiple images (which most projects do), the image that shoudl be flashed is called merged.hex and you should find it inside the build folder. If you use nRF Connect for VS Code and program from there it will automatically select the file.

For reference, here is the file that is programmed in that case on my computer when i flash the asset tracker application from nRF Connect SDK 2.7.0: /opt/nordic/ncs/v2.7.0/nrf/applications/asset_tracker_v2/build/merged.hex

[witch_mountain]

Hi!

Hmm that's what I suspected but I wanted to make sure, thanks. Looking a the build error I have, I already have my code file in the same larger folder as my toolchain as other posts on Devzone say to move your code to stop the errors. I'm not sure what to do in my case?