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nRF52840 DK J-link not working

GaryS

Hi - I'm using a nRF52840 DK for the first time with my 2010 MacBook pro running OSX Sierra version 10.12.6. I have SEGGER Embedded Studio for ARM 4.12 installed and Segger J-link V6.40 tools running in /Applications/SEGGER/JLink. My DK board has a PCA10056 debugger chip v1.0.0. 

I have the Power switch on the DK board set to on, coin cell battery removed, power switch set to VDD. 

When I connect the DK board to my Mac via micro USB cable, I see LED5 blinking about once a second, and LED1 pulsating about once per 3 sec. 

The big problem I'm having is that I can't get the Segger Embedded Studio to see the DK; when I select "Connect J-Link" in the Target menu, I keep getting a "Can't connect to J-Link via USB" pop-up. 

Also, I don't consistently see a "JLINK" drive widget in my Finder window. And even when I do see it and tell Segger ES to connect to the board, it ejects the JLINK drive and fails to connect as it does in all other cases. 

Any ideas?

Thanks. 

  • 0 in reply to GaryS

    2. Tried another cable - no joy, unfortunately. 

    3. Will try a different computer later. 

    4. Will measure supply voltage later. 

    5. Regarding Jlink version, I'm running V6.40 which I think is the latest version. Most times when I run /Applications/SEGGER/JLink/JLinkExe it fails right away like this:

    Gary-Sugars-MacBook-Pro:~ gsugar$ /Applications/SEGGER/JLink/JLinkExe
    SEGGER J-Link Commander V6.40 (Compiled Oct 26 2018 15:07:23)
    DLL version V6.40, compiled Oct 26 2018 15:07:12

    Connecting to J-Link via USB...FAILED: Cannot connect to J-Link via USB.

    Sometimes (when the JLINK drive icon appears in finder window) I see this:

    Gary-Sugars-MacBook-Pro:~ gsugar$ /Applications/SEGGER/JLink/JLinkExe
    SEGGER J-Link Commander V6.40 (Compiled Oct 26 2018 15:07:23)
    DLL version V6.40, compiled Oct 26 2018 15:07:12

    Connecting to J-Link via USB...Updating firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Jul 12 2018 11:44:41
    Replacing firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Jul 24 2017 17:30:12
    FAILED: Communication timeout. Emulator did not re-enumerate.

  • 0 in reply to GaryS

    6. Since I can't connect to the DK via JLinkExe, I would think that this approach won't work. Let me know if you disagree. 

  • 0 in reply to GaryS

    OK here's some good news ... I just rebooted my Mac and got everything to work somehow. Here's what happened when I ran JLinkExe after reboot:

    SEGGER J-Link Commander V6.40 (Compiled Oct 26 2018 15:07:23)
    DLL version V6.40, compiled Oct 26 2018 15:07:12

    Connecting to J-Link via USB...Updating firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Jul 12 2018 11:44:41
    Replacing firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Jul 24 2017 17:30:12
    Waiting for new firmware to boot
    New firmware booted successfully
    O.K.
    Firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Jul 12 2018 11:44:41
    Hardware version: V1.00
    S/N: 683009000
    VTref=3.300V

    I then ran the Segger Embedded Studio app, selected Target->Connect J-Link, and saw the screen below. Repeatedly disconnected and reconnected several times and it still works. Not sure how I got this to work, but it seems to now. Yuck - hope most folks have an easier time of this than I did! Thanks for your help. 

  • 0 in reply to GaryS

    Hi.

    Great to hear that you got it working.

    Best regards,

    Andreas

  • 0 in reply to AndreasF

    Excellent!!!

    This works! later on, segger updated jlink. no issue!

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