nRF52840 dongle with J-Link EDU Mini fails in VSCode debugging and also fails with external power supply

RE: nRF52840 dongle with J-Link EDU Mini fails in VSCode debugging and also fails with external power supply

user90435 — Thu, 02 Jun 2022 17:00:36 GMT

This seems to be the case I added "CONFIG_BOARD_HAS_NRF5_BOOTLOADER=n" to my proj.conf file and now VSCode can run/debug on the dongle through the J-Link Mini. The Dongle's normal bootloader resides in the first 0x1000 offset which doesn't apply when using a debugger which wipes out the bootloader...

RE: nRF52840 dongle with J-Link EDU Mini fails in VSCode debugging and also fails with external power supply

user90435 — Wed, 01 Jun 2022 16:24:16 GMT

Apparently the behavior changes with which board you select.

I used VSCode to compile the same code (both blinky and my app), but changed the target board from the nRF52840dongle_nrf52840 to nRF52840dk_nrf52840 and now both codes work with an external supply.

So there must be some configuration discrepancy between the two.

Perhaps it has to do with the presence of the DFU bootloader and startup vector or something.

RE: nRF52840 dongle with J-Link EDU Mini fails in VSCode debugging and also fails with external power supply

user90435 — Wed, 01 Jun 2022 14:46:10 GMT

I took an un-modified dongle and programmed the blinky hex file using DFU and the Programmer 3.0.0.

Then modified it for external supply...yes it apparently worked (blinks) from 3.3v external supply.

RE: nRF52840 dongle with J-Link EDU Mini fails in VSCode debugging and also fails with external power supply

user73165 — Wed, 01 Jun 2022 13:30:38 GMT

Hi there,

I was able to flash and execute the blinky example on the Dongle with NCS v1.8.0.

If you set the device in DFU mode, does it show up on your computer? Can you try to reprogram the bootloader by following this guide?

regards

Jared