Trying to establish a serial port connection to a local device (nRF52840DK) from the Bluetooth Low Energy App of the nRF Connect for Desktop.

[Jacek Majda]

Good day,

I want to use the Bluetooth Low Energy App of the nRF Connect for Desktop with my nRF52840DK as a local device.

After I have connected my device (nRF52840DK) to the USB port of my PC, I am getting the following message, as shown on the attached screenshot:

"Using JLink version: JLink_V7.96f

Installed JLink version does not match the provided version (V7.66a)".

What exactly shall I do in order to establish serial port connection to my local device (nRF52840DK)?

Regards,

JM

[Edvin]

Hello,

Click the "Select Device" menu in the top left corner, and select your DK. You will probably be asked if you want to program the DK. If so, select "Yes".

Then you should see some options, such as "Start scan".

Best regards,

Edvin

[Jacek Majda]

Hello,

When I click the "Select Device" menu in the top left corner, I see the message: "Connect a Nordic development kit to your computer".

But despite me having connected my nRF52840DK to my PC over the USB port - the above message stays on and I can't select my DK, as it is not displayed there - as shown on the attached screenshot.

It appears as if my DK is not being recognized by by the nRF Connect for Desktop Bluetooth Low Energy Standalone v4.0.4

Regards,

JM

[Edvin]

Are you using the correct USB port? The one on the short side of the DK? This one:

And is it powered on with the switch in the lower left corner?

Any lights on any on the LEDs on the DK?

And are you sure you are not using a USB charging cable (one without data lines)?

So: Make sure it is connected to the correct USB port on the kit, make sure it is powered on, and try with a different cable if it still doesn't work.

Best regards,

Edvin

[Jacek Majda]

Yes, I am using the correct USB port, on the short side of the DK.

As advised, I changed the USB cable - and this resolved my problem, as my nRF52840DK is now visible to the nRF Connect for Desktop.

So now when I click on "Select device", I can see my nRF52840DK listed in the top left corner. 

And when I click/select this device (nRF52840DK) a pop-up window comes up with the message:

 "Confirm

Device must be programmed, do you want to proceed?

"YES"   "NO"

When I click on "YES", I can see the LED on my nRF52840DK flashing once - but no info appears under "Discovered devices" - despite me knowing that there are several beacons transmitting in the vicinity of my PC.

I attach a screenshot showing the relevant page of the Bluetooth Low Energy App of the nRF Connect for Desktop.

Regards,

JM

[Edvin]

Try installing the a later version of JLink from segger.com. I am using v7.88j. Try to install this, restart your computer, and see if anything changes.

Best regards,

Edvin