zephyr pwm sequence

RE: zephyr pwm sequence

Einar Thorsrud — Sat, 20 Aug 2022 11:01:57 GMT

The interrupt priority comes from the devicetree file. For PWM0 on the nRF52833 you have this section in zephyr/dts/arm/nordic/nrf52833.dtsi (there are also similar for the other PWM instances):

		pwm0: pwm@4001c000 {
			compatible = "nordic,nrf-pwm";
			reg = <0x4001c000 0x1000>;
			interrupts = <28 NRF_DEFAULT_IRQ_PRIORITY>;
			status = "disabled";
			label = "PWM_0";
			#pwm-cells = <3>;
		};

The default priority is 1. If you want to change the interrupt priority, you can make an overlay file for your board where you set a different priority. The PWM related part would then be something like this (here the priority is set to 0, adjust as needed):

&pwm0 {
	interrupts = <28 0>;
};

RE: zephyr pwm sequence

Jay — Thu, 18 Aug 2022 18:40:40 GMT

In the old SDK the irq defines such as APP_IRQ_PRIORITY_LOWEST were defined in the in the file app_util_platform.h.

In the new ncs SDK where can I find the irq defines?

RE: zephyr pwm sequence

Jay — Mon, 08 Aug 2022 20:30:04 GMT

That is what I thought. But I had to check.

Thanks.

RE: zephyr pwm sequence

Einar Thorsrud — Mon, 08 Aug 2022 13:45:47 GMT

Hi,

The Zephyr PWM API does not allow you to play out waveforms. Using the nrfx PWM driver (nrfx_pwm) directly as you mention is probably most sensible in this case.