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  • Case ID: 347005
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I think I broke my bootloader, looking for help.

ulao

So I got me one of these

and after a day of making it work on windows I was able to lunch visual code from wsl and compile. the next day I found how to make a flash with nrfutil and was able to create a zip. So I pressed the button and the LED changed its blink rate, and I ran a few commands.

nrfutil keys generate private.key       

nrfutil pkg generate --hw-version 52 --sd-req 0x00 --application nrf52832_xxaa.hex --application-version 1 --key-file private.key app_dfu_package.zip    

nrfutil dfu serial -p COM5 -pkg app_dfu_package.zip -b 115200

I then got this

  [####################################]  100%
Device programmed.

now the device is dead. I tried holding down the button on insert and pressing after it was in. no USB chine no led. I flashed the gpiote example in hopes it woudl be a BT device that used GPIO pins, but it just make a brick.

Can this be fixed? If not, what did I do wrong?

Parents Reply
  • 0 in reply to ulao

    You can solder a 10 pin header to the bottom of the dongle, then connect to an external debugger.

    For most development work I'd recommend a full development kit, it's not a great experience to use the dongle and use serial DFU vs. a full debugger.

    My guess is that the bootloader fails to use an image with your own keys and dies before executing the application.

Children
  • 0 in reply to khelmutlord

    I have a full dev kit, I just need to know how to make the dongle work as my device will also use that.

    DFU is not new, this is a hugely common way to update firmware, why does everyone keep dodging the question, on here, in email, online... DFU is for the user experience why is this so difficult?

    Yes, I have a dev board, that is not my issue.I need to know how to flash the DFU  correctly and how to recover it ( this should not even be happening).  Guessing 1,2,3,4,5 down 6,7,8,9,10 up, and this is a j-tag? the dev board (nRF52840 ) has no 10 pin header I can find.

    Can I download a key that works with the bootloader? the firmware creation required I make one.

    I have the 10 pin on the bottom, but I'd need some type of wiring guide to show what I need to solder it to. Guessing it connects to my dev board (somehow.

    Normally, at least in my experience, you make a device, with a dev kit, then you make a boot loader for updates. The user has software to update it. That boot loader and software need to be nearly rock solid, because no one wants to spent time repairing a device they bought. So far the boot loader seem to be the hardest part of all of this. I'm thinking maybe I have misunderstood something here but I'm not sure.




  • 0 in reply to ulao

    It's impossible to tell you what is wrong with the bootloader since you cannot get logs out of it on the dongle. If boot fails, no logs come through the USB-CDC ACM port. That's why my recommendation is to use a development kit to diagnose these issues, building for an nRF52840-DK target before moving to the dongle. You also appear to have flashed an nRF52832 image to an nRF52840 dongle. 

    "nrfutil pkg generate --hw-version 52 --sd-req 0x00 --application nrf52832_xxaa.hex --application-version 1 --key-file private.key app_dfu_package.zip"

    Here is info on how to access the SWD pins on the dongle where it can be flashed with an MCUboot enabled application:

    https://docs.nordicsemi.com/bundle/ug_nrf52840_dongle/page/UG/nrf52840_Dongle/hw_swd_if.html

    For more information on adding MCUboot serial DFU to an application:

    academy.nordicsemi.com/.../

  • 0 in reply to ulao

    I think Chat GPT explained it best. This is not a dongle I can use its just junk to evaluate. So I need to some how program my boot loader to this via the 10 pin connector. Or manually solder on the chip ( hope not) to test how this will work for a user experience



    Also I think I can just make this connection to program the bootloader with my keys

    • DK P19 SWDIO → Dongle SWDIO

    • DK P19 SWDCLK → Dongle SWDCLK

    • DK P19 GND → Dongle GND

    • DK P19 VCC → Dongle VCC 

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