GPIO1.01 Pin Unresponsive on nRF5340 After Upgrading from NCS 2.4 to NCS v3.0.1

RE: GPIO1.01 Pin Unresponsive on nRF5340 After Upgrading from NCS 2.4 to NCS v3.0.1

Ben_M — Fri, 22 Aug 2025 03:50:00 GMT

Hi all，

Simply disabling UART in the device tree was not sufficient, because the forwarder node was still holding these pins.

The solution was to explicitly delete the UART node under gpio_fwd as follows:

&gpio_fwd
{ 
    /delete-node/ uart; 
};

This successfully released the pins, and they now work as expected.

I post this resolution in case it helps others who face similar issues.

Best regards,

Ben

RE: GPIO1.01 Pin Unresponsive on nRF5340 After Upgrading from NCS 2.4 to NCS v3.0.1

Ben_M — Fri, 22 Aug 2025 02:22:53 GMT

Hi szhaulai,

did you solve this issue? I encountered the same problem as yours: GPIO1 doesn't work by using gpio_pin_set_dt() when upgraded from ncs2.6.0 to ncs2.9.0.

I would be grateful if you could give me some tips.

Best Regards!

Ben

RE: GPIO1.01 Pin Unresponsive on nRF5340 After Upgrading from NCS 2.4 to NCS v3.0.1

Kenneth — Wed, 25 Jun 2025 13:21:57 GMT

Check if it's possible you are forwarding the control of the pins from the appcore to the netcore by e.g.:

	gpio_fwd: nrf-gpio-forwarder {
		compatible = "nordic,nrf-gpio-forwarder";
		status = "okay";
		uart {
			gpios = < &gpio1 0x1 0x0 >, < &gpio1 0x0 0x0 >, < &gpio0 0xb 0x0 >, < &gpio0 0xa 0x0 >;
		};
	};

Kenneth

RE: GPIO1.01 Pin Unresponsive on nRF5340 After Upgrading from NCS 2.4 to NCS v3.0.1

szhaulai — Tue, 24 Jun 2025 13:41:49 GMT

The following are the project configuration files, sysbuild folder, and boards folderdevzone.nordicsemi.com/.../6683.nrf5340dk_5F00_nrf5340_5F00_cpuapp.overlay

CONFIG_LOG=n
CONFIG_SERIAL=n

sysbuild/hci_ipc.conf

CONFIG_LOG=n

sysbuild/mcuboot.conf

devzone.nordicsemi.com/.../34706.prj.conf