nRF52840-DK onboard Segger J-Link

[Jack Porter]

Hi,

The User Guide v1.3 in Chapter 2 (minimum requirements) states "SEGGER J-Link Software" under "Software requirements".  Is there J-Link software specifically for use with Nordic boards ?

I have already downloaded and installed Segger J-Flash V6.44b.  It is able to detect, connect to and work with my standalone Segger J-Link Plus.  But it is not able to detect the nRF52840-DK.  J-Flash reports "No emulators connected via USB". 

Meanwhile, Device Manager shows the following wtih the nRF52840-DK J-Link USB connected to my Windows 10 PC:

Portable Devices: DAPLINK

Ports (COM & LPT): USB Serial Device (COM12)

Universal Serial Bus devices: WebUSB: CMSIS-DAP

Keil uVision is able to detect and work with the nRF52840-DK, but only with Debug configured as "CMSIS-DAP Debugger".  If I configure Debug as "J-Link / J-Trace Cortex", it reports "Cannot read J-Link version number".

Any advice would be appreciated.

Thanks

[Jack Porter]

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

[Øyvind]

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

[Jack Porter]

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

[Øyvind]

Glad to hear that everything is working!

-Øyvind