Current consumption of GRTC PWM Out

[Tom.Fu]

Hi Support Team 

How is the current consumption for GRTC PWM OUT of nRF54L15? Thanks.

[Susheel Nuguru]

not with the GRTC and PWM combination. Should be able to test it yourself with simple test like with below

#include <zephyr/kernel.h>
#include <hal/nrf_grtc.h>
#include <hal/nrf_pwm.h>

static void grtc_on(void)
{
	/* Make sure LF source is ready before starting. */
	nrf_grtc_task_trigger(NRF_GRTC, NRF_GRTC_TASK_LFCLKSTART);
	while (!nrf_grtc_event_check(NRF_GRTC, NRF_GRTC_EVENT_LFCLKSTARTED)) {
	}

	nrf_grtc_task_trigger(NRF_GRTC, NRF_GRTC_TASK_START);
}

static void grtc_off(void)
{
	nrf_grtc_task_trigger(NRF_GRTC, NRF_GRTC_TASK_STOP);
	nrf_grtc_task_trigger(NRF_GRTC, NRF_GRTC_TASK_LFCLKSTOP);
}

static void pwm_on(void)
{
	NRF_PWM_Type *pwm = NRF_PWM120; /* pick the instance you want to measure */

	nrf_pwm_disable(pwm);
	pwm->PRESCALER = PWM_PRESCALER_PRESCALER_DIV_8; /* any value is fine */
	pwm->COUNTERTOP = 16000;
	pwm->MODE = PWM_MODE_UPDOWN_Up;

	pwm->PSEL.OUT[0] = PWM_PSEL_OUT_CONNECT_Disconnected;

	pwm->SEQ[0].CNT = 1;
	pwm->SEQ[0].REFRESH = 0;
	pwm->SEQ[0].ENDDELAY = 0;
	pwm->SEQ[0].PTR = (uint32_t)&pwm->COUNTERTOP; /* dummy constant */
	pwm->SEQ[0].MAXCNT = 1;

	nrf_pwm_enable(pwm);
	nrf_pwm_task_trigger(pwm, NRF_PWM_TASK_SEQSTART0);
}

static void pwm_off(void)
{
	NRF_PWM_Type *pwm = NRF_PWM120;

	nrf_pwm_task_trigger(pwm, NRF_PWM_TASK_STOP);
	while (!nrf_pwm_event_check(pwm, NRF_PWM_EVENT_STOPPED)) {
	}

	nrf_pwm_disable(pwm);
}

void main(void)
{
	k_sleep(K_SECONDS(5));

	grtc_on();
	k_sleep(K_SECONDS(5));
	grtc_off();

	pwm_on();
	k_sleep(K_SECONDS(5));
	pwm_off();

	/* stay idle so you can measure post-test baseline if needed */
	while (true) {
		k_sleep(K_SECONDS(1));
	}
}