JLink communication time out

RE: JLink communication time out

Jared — Tue, 03 Sep 2024 09:16:43 GMT

Hi,

I'm sorry for the late feedback.

Do you get any error when you try to flash the board from VS code, can you share the log output?

Can you also specify whether you used Toolchain manger or installed the SDK manually?

regards

Jared

RE: JLink communication time out

AndrewCichy — Tue, 27 Aug 2024 15:50:09 GMT

For any future reader who encounters this issue and is wondering how they can do what I am doing,

Use the SDK in VSCode to build your application.

In a command prompt connect to your dev kit using JLink CLI (I have a nrf52840dk)

JLink.exe -device nRF52840_xxAA -if SWD -speed 4000 -autoconnect 1

In the J-Link console flash the generated hex file to your board (Mine is located under build\zephyr\zephyr.hex):

C:\ {YOUR PATH TO PROJECT}\build\zephyr\zephyr.hex

Reset the board and run the new firmware

RE: JLink communication time out

AndrewCichy — Tue, 27 Aug 2024 15:44:02 GMT

I have figured out the problem is not with the hardware or with JLink itself but seems to be with the SDK. When using the flashing option provided through the SDK in VSCode, I encounter the issue described in the post. However, when I use JLink through the command line I can flash the board without failure.

So I have found a way to flash the board, but to any Nordic Engineer reading this there is an error with the flash functionality in the SDK. I have uninstalled and reinstalled the SDK and toolchain multiple times and the issue did not go away.

RE: JLink communication time out

AndrewCichy — Mon, 26 Aug 2024 18:02:51 GMT

I am attempting to put the board in bootloader mode (Option 4 in the link you provided) but the board is not entering bootloader mode when pressing the reset button while powering the board on.

RE: JLink communication time out

AndrewCichy — Fri, 23 Aug 2024 18:21:35 GMT

I would like to fix this issue, but I am using the board to develop and demonstrate some Bluetooth functionality which is time sensitive for me. What is your policy on replacement / refund considering I purchased this board less than a month ago?

RE: JLink communication time out

AndrewCichy — Fri, 23 Aug 2024 18:17:22 GMT

The USB port does not seem damaged. I used a new cable, I don't have a different computer to try flashing with. I don't have a volt meter to measure the voltage currently but I can get one next week. The board was working better for a couple days when I used an additional USB connected to power, but now the board will no longer flash an application. I have replaced the coin cell battery and that did not improve things.

RE: JLink communication time out

Jared — Fri, 16 Aug 2024 08:00:41 GMT

Hi,

Thank you for the clear description of your problem.

Have you checked that the USB port hasn't been physically damaged and that the USB header is still firmly connected to the solder pads? It hasn't been loosened, has it? Sometimes this can happen if the USB cable is bent while it's inserted into the DK?
Can you go through the steps here and see if any of them fixed your issue?
What voltage do you measure on RESET, GND, and VDD?
Can you share a picture of your board that shows the sticker with version number?

regards
Jared