Interferance when using uart0 port on light_bulb matter sample

[Ignacio]

Hi,

I have found interference when implementing uart0 on the light_bulb matter sample.

RX and TX work fine when not connected, but once connected on a loop back the line because very noisy.

My queries are:

- Is uart0 used for any other process on the light_bulb matter sample?

- Is any of the default uart0 pins used for any other process on the light_bulb matter sample?

I have managed to get uart working by using uart1 port but I was wondering why uart0 is unavailable.

Thanks

[Jørgen Holmefjord]

Hi,

Which device/board are you building for, and which version of nRF Connect SDK are you using?

RX and TX work fine when not connected, but once connected on a loop back the line because very noisy.

What do you mean by connected and not connected? Does this refer to the physical UART lines, or the Matter radio communication?

- Is uart0 used for any other process on the light_bulb matter sample?

The samples does not usually reference exact instances. The instances are configured using Devicetree nodes, to enable samples to run on many different boards.

UART0 is typically by default configured as console/logging interface for most samples in nRF Connect SDK.

- Is any of the default uart0 pins used for any other process on the light_bulb matter sample?

This is also configured in devicetree, and might differ between different devices/boards.

Best regards,
Jørgen