nRF52840-DK onboard Segger J-Link

RE: nRF52840-DK onboard Segger J-Link

Øyvind — Tue, 30 Apr 2019 12:12:15 GMT

Glad to hear that everything is working! 🙂

-Øyvind

RE: nRF52840-DK onboard Segger J-Link

Jack Porter — Tue, 30 Apr 2019 00:19:34 GMT

Hi, I reflashed the J-Link firmware and everything works now.

FYI I had overwritten J-Link with Daplink when I started working with Arm Mbed OS and they seem to recommend Daplink. But J-Link and Daplink seem to do all the same things WRT Mbed OS development, and J-Link retains compatibility with Segger’s software and nrfjprog.

Thanks for the help!

Jack

RE: nRF52840-DK onboard Segger J-Link

Øyvind — Thu, 25 Apr 2019 11:46:57 GMT

Hi, yes it should be the same. But to be on the safe side, use the link from the nRF52840-DK download page 🙂

Kind regards,
Øyvind

RE: nRF52840-DK onboard Segger J-Link

Jack Porter — Thu, 25 Apr 2019 11:19:07 GMT

Hi, just double-checking before I re-flash the board. The page you referred me to is labelled "nRF52 DK" and specifically mentions nRF52810 and nRF52832 but not nRF52840. Do the downloads actually apply to nRF52840 as well ? Thanks

RE: nRF52840-DK onboard Segger J-Link

Øyvind — Thu, 25 Apr 2019 07:37:45 GMT

Thanks for the screenshots!
I just realized that it is configured as DAPLink, which is not J-Link. The FW on the Segger device is not correct and you need to reset this.

Please go to this link and download latest Interface MCU firmware for J-Link (J-Link OB-SAM3U128-V2-NordicSemi 170724.bin).
Put the device into bootloader mode (holding down reset while power cycling)
A new Mass Storage Device, probably called BOOTLOADER, should have appeared
Drag and drop the J-Link OB-SAM3U128-V2-NordicSemi 170724.bin onto the mass storage device
After it has been programmed, power cycle the device again

Let me know how that works!

Kind regards,
Øyvind

RE: nRF52840-DK onboard Segger J-Link

Jack Porter — Wed, 24 Apr 2019 13:21:57 GMT

Hi,

I installed nrfjprog. It doesn't see the nRF52840-DK either:

I created a new project in J-Flash, selected nRF52840_xxAA, SWD, 4000 kHz. When I clicked Target, Connect I got the "No emulators connected popup". When I confirmed that, I got the "Cannot connect" popup:

Meanwhile, here's Device Manager:

Sorry for all the whitespace between the pictures, I couldn't figure out how to get rid of it.

Thanks

RE: nRF52840-DK onboard Segger J-Link

Øyvind — Wed, 24 Apr 2019 07:13:01 GMT

Due to Easter Holiday, our support team has not been fully staffed. We apologize for the late answer, and any inconvenience this may have caused.

Hello,

What happens if you use our tool nrfjprog? I.e.

nrfjprog -i

Using J-Flash, how are you trying to connect our device? Are you able to connect using File -> New Project, a pop-up will ask for a target device. Choose target interface SWD:

Then you should be able to connect via menu Target -> Connect.

Kind regards,
Øyvind