/**
 * @file power.h
 * @brief Power management: DC/DC regulator, GPIOTE wakeup, WFI sleep.
 */
#pragma once
#include <stdbool.h>

/** @brief Enable the DC/DC converter, configure GPIO input and GPIOTE wakeup on the PTT button. */
void power_init(void);

/**
 * @brief Enter SYSTEM_ON low-power sleep and return on the next GPIOTE event.
 *
 * Sets TASKS_LOWPWR then executes WFI.  The CPU wakes when the GPIOTE
 * interrupt fires (button press) and resumes from here.
 */
void power_sleep_until_button(void);

/**
 * @brief Return the current state of the PTT button.
 * @return true when the button is pressed.
 */
bool power_button_pressed(void);