Issues with custom board files & simple peripherals.

RE: Issues with custom board files & simple peripherals.

Simonr — Wed, 12 Nov 2025 07:50:04 GMT

Hi Al

I see. I guess we don't have any specific coverage of using multiple PWM channels no, and for learning purposes the Devacademy is the best resource we have. Other things to check out:

PWM API: https://docs.nordicsemi.com/bundle/nrfx-apis-latest/page/group_nrf_pwm.html

Application development in NCS: https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/app_dev.html

The DevZone blog: Blogs

The DevZone NCS project collection: nRF Connect SDK projects

These are at least some good starting points to read up on. Let me know if you're looking for anything in specific and I'll try to help you dig it out. There is a lot of documentation, so I understand the confusion

Best regards,

Simon

RE: Issues with custom board files & simple peripherals.

Monkeytronics — Tue, 11 Nov 2025 05:39:48 GMT

The dev academy course is great. But it only has a single PWM channel in the example - so didn't address the aspect that was confusing me (I appreciate that it's on me to learn how device tree works though). Is dev academy the only nrf connect specific resource for developers, or would you recommend other resources? It's all a bit new, but I'm keen to read around as much as possible.

RE: Issues with custom board files & simple peripherals.

Simonr — Mon, 10 Nov 2025 07:59:05 GMT

The PWM lesson in our NCS DevAcademy course available here should cover generic PWM usage. If you think anything specific is missing from it, please let me know and I'll chase down further documentation.

Best regards,

Simon

RE: Issues with custom board files & simple peripherals.

Monkeytronics — Sun, 09 Nov 2025 22:11:44 GMT

Figured it out. It's in the device tree code. I was defining the 3 PWMs as separate PWM instances: I should have defined one PWM with 3 channels like this.

PRO: Should only need to do this stuff once.

CON: I can't find great documentation for this stuff. Am I missing it? Would appreciate a link.

&pwm0 {
	status = "okay";
	pinctrl-0 = <&pwm0_default>;
	pinctrl-1 = <&pwm0_sleep>;
	pinctrl-names = "default", "sleep";
};

&pinctrl {
	...
	
	pwm0_default: pwm0_default {
		group1 {
			psels = <NRF_PSEL(PWM_OUT0, 0, 0)>,
				<NRF_PSEL(PWM_OUT1, 0, 1)>,
				<NRF_PSEL(PWM_OUT2, 0, 2)>;
		};
	};

	pwm0_sleep: pwm0_sleep {
		group1 {
			psels = <NRF_PSEL(PWM_OUT0, 0, 0)>,
				<NRF_PSEL(PWM_OUT1, 0, 1)>,
				<NRF_PSEL(PWM_OUT2, 0, 2)>;
			low-power-enable;
		};
	};

    ...
}