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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019 Jeff Epler for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef __INCLUDED_SUPERVISOR_TICK_H
#define __INCLUDED_SUPERVISOR_TICK_H
#include <stdint.h>
#include <stdbool.h>
/** @brief To be called once every ms
*
* The port must call supervisor_tick once per millisecond to perform regular tasks.
* This is called from the SysTick interrupt or similar, and is safe to call in an
* interrupt context.
*/
extern void supervisor_tick(void);
/** @brief Get the lower 32 bits of the time in milliseconds
*
* This can be more efficient than supervisor_ticks_ms64, for sites where a wraparound
* of ~49.5 days is not harmful.
*/
extern uint32_t supervisor_ticks_ms32(void);
/** @brief Get the full time in milliseconds
*
* Because common ARM mcus cannot atomically work with 64-bit quantities, this
* function must briefly disable interrupts in order to return the value. If
* only relative durations of less than about ~49.5 days need to be considered,
* then it may be possible to use supervisor_ticks_ms32() instead.
*/
extern uint64_t supervisor_ticks_ms64(void);
/** @brief Run background ticks, but only about every millisecond.
*
* Normally, this is not called directly. Instead use the RUN_BACKGROUND_TASKS
* macro.
*/
extern void supervisor_run_background_if_tick(void);
extern void supervisor_enable_tick(void);
extern void supervisor_disable_tick(void);
/**
* @brief Return true if tick-based background tasks ran within the last 1s
*
* Note that when ticks are not enabled, this function can return false; this is
* intended.
*/
extern bool supervisor_background_tasks_ok(void);
#endif
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