nrf52840 DK, no drive, no jlink

[carlberg74]

Hi,

One of my nrf52840 DK cards wont detect as jlink, nor bootloader drive anymore. But I can still program it using a Segger jtag programmer and P18 port.
Running Windows, I know I'm not missing drivers, as the other nrf52840 DK card works (both jlink and bootloader drive).

I don't think the USB connector is broken, as I can see that it at least get power through it.
I think I'm missing the bootloader on the card, but I am not sure how to flash that.

I have tested all on this thread.
My nRF52/nRF51 DK kit doesn't work. - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)
and nrfjprog --recover

Suggestions?

Best Regards
-Anders

[Amanda Hsieh]

Hi Anders, 

I think I'm missing the bootloader on the card, but I am not sure how to flash that.

Have you tried to press the IF BOOT/RESET button while power cycling the kit? It should then show up as a Removable Storage Device named "BOOTLOADER". Then you can drag-and-drop the J-LINK interface MCU firmware found here (v170724) onto the storage device to reprogram the JLINK firmware.

If the kit does not show up as "BOOTLOADER", try to download and install the mbed Windows serial port driver from here: http://developer.mbed.org/media/downloads/drivers/mbedWinSerial_16466.exe

Also attached here:
mbedWinSerial_16466.rar

-Amanda H.

[carlberg74]

Hi Amanda,

No, the drive does not appear when holding down BOOT/RESET button when powering on.
This does work on the other card, a BOOTLOADER drive appears..
I installed the mbedWinSerial driver, but that did not help.

I think I need to flash the card using the Segger jtag programmer. And I think this is how I ended up with this problem, meaning, I have used the P18 port and a programmer to program the card and that way lost the bootloader.

Any idea what else I can try?

Best Regards
-Anders

[Amanda Hsieh]

Hi,

I would suggest change a new DK. Contact your provider to ask if it's possible to change. 

Regards,
Amanda 

[carlberg74]

Hi Amanda,

What do you mean with "change a new DK", do you mean replace the card?

Regards
- Anders

[Amanda Hsieh]

Hi  Anders,

carlberg74 said:

And I think this is how I ended up with this problem, meaning, I have used the P18 port and a programmer to program the card and that way lost the bootloader.

Seems you still can use P18 to program the DK. 

If you want to program via the onboard debugger (usb port), you might need to change a new board. 

Regards,
Amanda