Matter Light Bulb Sample External GPIO not working as expected

[g204]

Hi,

I am able to successfully build and flash the Matter Light Bulb sample onto my nRF52840 DK.

I am now getting ready to configure the firmware for use on a custom board. Before I do so I am trying to get the sample flashed onto the same DK with the use of external LEDs/Buttons.

In the file 'nrf52840dk_nrf52840.dts' I am simply changing the GPIO pinout mappings to match the headers on the DK I wish to connect my external LEDs/Buttons to.

As an example, if you build and flash the sample as is, before you pair the accessory to a border router, LED 1 on the DK (Green LED 0) will continuously toggle on and off.

If I simply change the GPIO pin from P0.13 to P0.17, I then connect an LED using a breadboard up to P0.17 on the DK. Once I rebuild and re-flash I would expect the LED to toggle on and off just as it did on the DK with LED1 set to P0.13, but it does not.

I am having the exact same issue when reconfiguring the buttons.

I feel I am missing something extremely obvious but can't seem to work it out.

Below is a screenshot for the code in question just for reference.

P.S I know this is not the best method for uploading firmware to a new custom board. I am simply using the current DK dts file for simplicity of debugging, as I am having seperate issues that I need to resolve when flashing onto my custom board.

Cheers,

Gideon

[g204]

Just for clarification, here is the circuit diagram, where the red lines indicate connections.