nrf52840 dongle alway boot in dfu

[nicolasp]

Tried to flash ncp .hex for pca10059 on a brand new dongle and now it is stuck in dfu (pulsing red led). The process worked on a second dongle without any issues.

Something is wrong with the dongle?

[Simonr]

Hi

How are you flashing your Dongle? To program it from DFU mode, please see the Program application using nRF Connect Programmer section in our nRF52840 Dongle programming tutorial.

Best regards,

Simon

[nicolasp]

Im flashing using nrf connect. I used nRF5_SDK_for_Thread_and_Zigbee_v3.1.0_c7c4730/examples/peripheral/blinky/hex/blinky_pca10059_mbr.hex

Booting with a JLink connected and resseting using debugger seems to get the firmware going.

[Simonr]

nicolasp said:

Booting with a JLink connected and resseting using debugger seems to get the firmware going.

 Does this mean you got it to work?

It should not be necessary with a JLink device when the Dongle is in DFU mode and you're using the nRFConnect Programmer app.

Best regards,

Simon

[nicolasp]

No, its only working while the debugger is connected. I also cant seem to erase uicr with nrfjprog, reading bootloader location address alway return weird values and not 0xffffffff after nrfjprog -e . I think the mcu is faulty. 

[Simonr]

It might be that the MCU is faulty, but I'd like to do some further tests first. Could you try the command nrfjprog --recover on the chip. This should reset the chip to the factory settings. You could also, while the chip is in DFU mode, select the Dongle in the nRFConnect Programmer app, and run a System report (the "hamburger" button in the top left corner) and upload the .txt. file here so I can have a look.

Best regards,

Simon