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No connection with nRF52840 DK from PC via USB (J2)?

KPC_Lunav

Hi,

I saw a similar post (Case ID: 249969) and this just happen to me.

I have not used my nRF52840 DK for a few weeks. It has been in its original plastic bag the whole time. Connected it today and nothing happen (no light on LED5), no responds from Windows that it connected. I also plugged in a nRF52 DK on the same USB cable and that "turned" on, LED blinking and I could connect to it with the nRF Connect application (v3.3.3) and programer v1.4.2.

made sure it was like below:

I checked power on TP11 and TP12 - found 5V as expected. I also checked other TPs and found 3.19V (TP31) and 4.65V (TP32).  Also measured 2.98V on VDDnRF and same on TP7.

So I'm very curious on what has happen with my nRF52840 DK?

Could it be something wrong with the interface MCU? IF BOOT/RESET button?

Any suggestion would be appreciated.

best regards,

Peter 

  • 0

    Hi Peter

    When connecting the board to your computer (using J2), do you see it as a JLINK device on your computer at all? If so, you can try to drag and drop the MCU firmware .bin file, downloadable here, into the JLink drive to see if that helps.

    have you used this board for current measurement perhaps? If so, check if solder bride SB40 is cut. If it is, you will need a jumper on pin header P22 in order to make the board run as normal. Can you also provide the markings on the board, PCA10056 and so on? You should also check the board physically to see if any components seem to be missing.

    Best regards,

    Simon

  • 0 in reply to Simonr

    Hi Simon,

    The this is the specification of the DK:

    I have only used it for programming other nRF52832 and nRF52840 boards via P19 with a Tag-Connect cable. I have not performed any current measurement etc. all solder bridges are intact as original.

    The JLINK device is not available when I connect the Dev Kit to my PC. However, it shows up as expected when I connect the nRF52 DK. 

    All components on the board seems to be intact. 

    Peter

  • 0

    Hi again

    Can you try to completely power cycle your board? Turn the ON-OFF button off, remove the battery, and USB cable, before inserting the cable and try powering it back on. You can also try another USB cable to confirm that it's not a bad cable that is the problem.

    If you still don't see any life signs, I think your board might be bricked somehow.

    Best regards,

    Simon

  • 0 in reply to Simonr

    Hi Simon,

    I have done complete power cycle with no battery, no USB and several different USB cables. Still no connection to J-LINK.

    The whole board is not "bricked" as the nRF52840 was flashed with a program a few weeks back and this is running as normal - i.e. it is a Bluetooth mesh node and it pops up in the nRF Connect app on my phone and on my MQTT broker. 

    So it looks like the J-LINK interface is "bricked".

    Is there anything we can do with the IF BOOT button or other hacks to get it back to normal?

    Kind of need to flash a bunch of nRF52840 boards....

    Peter

  • 0

    Hi

    Okay, try the following:

    1. Download the MCU firmware (.bin file) from the DK's download page if you haven't already.

    2. Hold reset button and power on the DK.

    3. You should see a "bootloader" drive on your computer, insert the .bin file in this drive. Do not put any other files here!

    4. Let the interface MCU flash itself. It should reconnect as a J-Link, and be usable again.

    PS: This will happen if you hold the reset button on DK power-up, so that might be what has happened.

    Best regards,

    Simon

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