Enabling UART2 on nRF9151 DK using P0.02 and P0.03 – Verification Needed

RE: Enabling UART2 on nRF9151 DK using P0.02 and P0.03 – Verification Needed

Edvin — Wed, 04 Mar 2026 14:40:33 GMT

How do you determine that no data is output on the UART? Did you try to switch the TX and RX pin in the .overlay file? Both for uart2_default and uart2_sleep:

&pinctrl {
	uart2_default: uart2_default {
		group1 {
			psels = <NRF_PSEL(UART_TX, 0, 2)>;
		};

		group2 {
			psels = <NRF_PSEL(UART_RX, 0, 3)>;
			bias-pull-up;
		};
	};

    uart2_sleep: uart2_sleep {
		group1 {
			psels = <NRF_PSEL(UART_TX, 0, 2)>,
				<NRF_PSEL(UART_RX, 0, 3)>;
			low-power-enable;
		};
	};
};

Have you tried analysing the pins using a logic analyzer to see if there is any data?

Best regards,

Edvin

RE: Enabling UART2 on nRF9151 DK using P0.02 and P0.03 – Verification Needed

Suhas0 — Wed, 04 Mar 2026 14:00:08 GMT

Hi, Edvin

I tested your attached project.

The build and flash are successful, but no data is observed on UART2 (P0.02 / P0.03).

Could you please confirm if anything additional is required to enable UART2 output on the nRF9151 DK?

Thanks.

Best regards,
Suhas

RE: Enabling UART2 on nRF9151 DK using P0.02 and P0.03 – Verification Needed

Edvin — Fri, 27 Feb 2026 14:28:41 GMT

Hello,

Please try the attached sample:

devzone.nordicsemi.com/.../hello_5F00_world_5F00_uart2.zip

Your overlay file doesn't look correct, see how I did it in the attached project. I tested this, building it for nrf9151dk/nrf9151/ns, using NCS v3.2.2, and flashed it. It seems to work using pins P0.02 and P0.03 (I may have mixed up TX and RX).

Best regards,

Edvin