samples/boards/nrf52/power_mgr/src/power.c

/*
 * Copyright (c) 2018 Nordic Semiconductor ASA.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include "sample.h"

/*
 * Application defined function for doing any target specific operations
 * for low power entry.
 */
void sys_pm_notify_power_state_entry(enum power_states state)
{
	switch (state) {
	case SYS_POWER_STATE_SLEEP_2:
		printk("--> Entering to SYS_POWER_STATE_SLEEP_2 state.\n");

		/*
		 * This power state is implemented by this sample.
		 * Perform enter to the low power state by turning off LED2.
		 */
		gpio_pin_write(gpio_port, LED_1, LED_ON);
		gpio_pin_write(gpio_port, LED_2, LED_OFF);
		k_cpu_idle();
		break;

	case SYS_POWER_STATE_SLEEP_3:
		printk("--> Entering to SYS_POWER_STATE_SLEEP_3 state.\n");

		/*
		 * This power state is implemented by this sample.
		 * Perform enter to the low power state by turning off LEDs.
		 */
		gpio_pin_write(gpio_port, LED_1, LED_OFF);
		gpio_pin_write(gpio_port, LED_2, LED_OFF);
		k_cpu_idle();
		break;

	case SYS_POWER_STATE_DEEP_SLEEP_1:
		printk("--> Entering to SYS_POWER_STATE_DEEP_SLEEP_1 state.\n");

		/*
		 * This power mode is already implemented by the OS. It will be
		 * handled by SoC-specific code. Here we just turn off the LEDs
		 * to save power.
		 */
		gpio_pin_write(gpio_port, LED_1, LED_OFF);
		gpio_pin_write(gpio_port, LED_2, LED_OFF);

		/* Nothing else to do */
		break;

	default:
		printk("Unsupported power state %u", state);
		break;
	}
}

/*
 * Application defined function for doing any target specific operations
 * for low power exit.
 */
void sys_pm_notify_power_state_exit(enum power_states state)
{
	switch (state) {
	case SYS_POWER_STATE_SLEEP_2:
		printk("--> Exited from SYS_POWER_STATE_SLEEP_2 state.\n");

		/* Perform exit from the low power state by turning on LEDs */
		gpio_pin_write(gpio_port, LED_1, LED_ON);
		gpio_pin_write(gpio_port, LED_2, LED_ON);
		break;

	case SYS_POWER_STATE_SLEEP_3:
		printk("--> Exited from SYS_POWER_STATE_SLEEP_3 state.\n");

		/* Perform exit from the low power state by turning on LEDs */
		gpio_pin_write(gpio_port, LED_1, LED_ON);
		gpio_pin_write(gpio_port, LED_2, LED_ON);
		break;

	case SYS_POWER_STATE_DEEP_SLEEP_1:
		printk("--> Exited from SYS_POWER_STATE_DEEP_SLEEP_1 state.\n");

		/* Turn on LEDs which were powered down before deep sleep. */
		gpio_pin_write(gpio_port, LED_1, LED_ON);
		gpio_pin_write(gpio_port, LED_2, LED_ON);
		break;

	default:
		printk("Unsupported power state %u", state);
		break;
	}
}