Unable to get UART log output on nRF9151 DK

RE: Unable to get UART log output on nRF9151 DK

gterrell — Wed, 20 Aug 2025 17:02:08 GMT

Big thanks Hakon, the correct nrf9151dk_nrf9151_common-pinctrl.dtsi did the trick. I must have accidently changed the file while creating the board definitions for our custom board.

RE: Unable to get UART log output on nRF9151 DK

gterrell — Wed, 20 Aug 2025 15:21:36 GMT

My nrf9151dk_nrf9151_common-pinctrl.dtsi does not match yours, it is likely that the file on my system was inadvertently changed. I have pasted your content in and will test UART log functionality today.

RE: Unable to get UART log output on nRF9151 DK

Hakon — Wed, 20 Aug 2025 15:15:21 GMT

[quote user="gterrell"]nrf9151dk_nrf9151_common-pinctrl.dtsi nrf9151dk_nrf9151_common.dtsi[/quote]

Have you changed nrf9151dk_nrf9151_common-pinctrl.dtsi? It should look like this

/*
 * Copyright (c) 2023 Nordic Semiconductor
 * SPDX-License-Identifier: Apache-2.0
 */

&pinctrl {
	uart0_default: uart0_default {
		group1 {
			psels = <NRF_PSEL(UART_TX, 0, 27)>,
				<NRF_PSEL(UART_RTS, 0, 14)>;
		};
		group2 {
			psels = <NRF_PSEL(UART_RX, 0, 26)>,
				<NRF_PSEL(UART_CTS, 0, 15)>;
			bias-pull-up;
		};
	};

	uart0_sleep: uart0_sleep {
		group1 {
			psels = <NRF_PSEL(UART_TX, 0, 27)>,
				<NRF_PSEL(UART_RX, 0, 26)>,
				<NRF_PSEL(UART_RTS, 0, 14)>,
				<NRF_PSEL(UART_CTS, 0, 15)>;
			low-power-enable;
		};
	};

	uart1_default: uart1_default {
		group1 {
			psels = <NRF_PSEL(UART_TX, 0, 29)>,
				<NRF_PSEL(UART_RTS, 0, 16)>;
		};
		group2 {
			psels = <NRF_PSEL(UART_RX, 0, 28)>,
				<NRF_PSEL(UART_CTS, 0, 17)>;
			bias-pull-up;
		};
	};

	uart1_sleep: uart1_sleep {
		group1 {
			psels = <NRF_PSEL(UART_TX, 0, 29)>,
				<NRF_PSEL(UART_RX, 0, 28)>,
				<NRF_PSEL(UART_RTS, 0, 16)>,
				<NRF_PSEL(UART_CTS, 0, 17)>;
			low-power-enable;
		};
	};

	i2c2_default: i2c2_default {
		group1 {
			psels = <NRF_PSEL(TWIM_SDA, 0, 30)>,
				<NRF_PSEL(TWIM_SCL, 0, 31)>;
		};
	};

	i2c2_sleep: i2c2_sleep {
		group1 {
			psels = <NRF_PSEL(TWIM_SDA, 0, 30)>,
				<NRF_PSEL(TWIM_SCL, 0, 31)>;
			low-power-enable;
		};
	};

	pwm0_default: pwm0_default {
		group1 {
			psels = <NRF_PSEL(PWM_OUT0, 0, 0)>;
		};
	};

	pwm0_sleep: pwm0_sleep {
		group1 {
			psels = <NRF_PSEL(PWM_OUT0, 0, 0)>;
			low-power-enable;
		};
	};

	spi3_default: spi3_default {
		group1 {
			psels = <NRF_PSEL(SPIM_SCK, 0, 13)>,
				<NRF_PSEL(SPIM_MISO, 0, 12)>,
				<NRF_PSEL(SPIM_MOSI, 0, 11)>;
			nordic,drive-mode = <NRF_DRIVE_H0H1>;
		};
	};

	spi3_sleep: spi3_sleep {
		group1 {
			psels = <NRF_PSEL(SPIM_SCK, 0, 13)>,
				<NRF_PSEL(SPIM_MISO, 0, 12)>,
				<NRF_PSEL(SPIM_MOSI, 0, 11)>;
			low-power-enable;
		};
	};
};

RE: Unable to get UART log output on nRF9151 DK

gterrell — Wed, 20 Aug 2025 11:03:11 GMT

No overlay, double checked. I don't see the register addresses in my 9151 board pinctrl file, that must get translated during build into the dts file.

Should I reinstall SDK 3.0.2?devzone.nordicsemi.com/.../nrf9151dk_5F00_nrf9151_5F00_common_2D00_pinctrl.dtsi devzone.nordicsemi.com/.../nrf9151dk_5F00_nrf9151_5F00_common.dtsi

RE: Unable to get UART log output on nRF9151 DK

Hakon — Wed, 20 Aug 2025 08:57:15 GMT

Are you using an overlay file that you did not upload in the zip? I get this when I diff your zephyr.dts file with mine

RE: Unable to get UART log output on nRF9151 DK

gterrell — Tue, 19 Aug 2025 15:41:10 GMT

Settings are 115200, 8n1, no RTS/CTS

RE: Unable to get UART log output on nRF9151 DK

gterrell — Tue, 19 Aug 2025 15:39:51 GMT

Files requested are attached in zip.

Windows 11 is workstation OS. Tried using nRF Connect for Desktop, Serial Terminal and the nRF Terminal within VSCode. The 2nd virtual COM port attach the the TF-M works, I get a startup message on reset press (for both Desktop Serial Terminal and VSCode nRF Terminal). I have tried this on 2 different nRF9151 DK boards.

devzone.nordicsemi.com/.../8032.build_5F00_files.zip

RE: Unable to get UART log output on nRF9151 DK

Hakon — Tue, 19 Aug 2025 15:10:15 GMT

Hello,

I tried running your code and it did successfully print on the UART. I did not do any modifications.

Can you please provide full build config found in build/app_name/zephyr/.config and also zephyr.dts found in the same location? Also, can you describe what OS and program used to read the serial port? What are your settings there?