No Serial Output from Matter Samples on nRF5340 DK with SDK 2.9.1 and 3.1.0

[vishal gade]

I have attempted running various Matter sample applications on the nRF5340 DK board using both nRF Connect SDK v2.9.1 and the latest stable v3.1.0 releases.

All samples were built and flashed successfully, but no serial output appears on any of the serial ports when using the nRF Connect serial terminal. I have tried connecting to the default USB CDC ACM ports at 115200 baud and tested both UART and USB serial interfaces, but no boot or debug logs are visible.

It seems like the device might not be fully booting or initializing properly post-flashing.

Any help or pointers to known issues would be highly appreciated.

Thank you.

[Elfving]

Hi Vishal,

I assume this is either a problem with the USB cable/port, or you connecting to the wrong COM port. As the 5340 has multiple cores, it might show up as having multiple COM ports. Could you try the other one, reset the board, and see if it works?

If none of this works could you try other samples for the 5340? They should all print something on the COM port.

Regards,

Elfving

[vishal gade]

Hi Elfving,

Thank you for your response. I have already tried connecting to both VCOM ports and verified that other non-Matter sample applications print correctly to the serial terminal (I attached few examples). The issue only occurs with the Matter examples; they build and flash successfully but do not produce any serial output.

Regards,
Vishal Gade.

[vishal gade]

Hi Elfving,

It turns out the issue was with my nRF5340 DK board itself. After replacing it with a new board, the Matter samples worked as expected and started printing logs correctly. Thanks for the support and guidance!