97 lines
2.9 KiB
C
97 lines
2.9 KiB
C
/* Reflow Oven Controller
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*
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* Copyright (C) 2020 Mario Hüttel <mario.huettel@gmx.net>
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*
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* This file is part of the Reflow Oven Controller Project.
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*
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* The reflow oven controller is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* GDSII-Converter is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with the reflow oven controller project.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file systick.h
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*/
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#ifndef __SYSTICK_H__
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#define __SYSTICK_H__
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#include <stdint.h>
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#include <stdbool.h>
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/**
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* @brief Reload value for the systick timer.
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*
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* This value has to be configured to set the systick to a 100 us tick interval
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* The default value is 16800, which results in a 100us tick for 168 MHz CPU speed
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*/
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#define SYSTICK_RELOAD (16800UL)
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/**
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* @brief Variable used by the systick_wait_ms function
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*/
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extern volatile uint32_t wait_tick_ms;
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/**
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* @brief Systemclock in milliseconds.
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*
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* This value must not be reset during the whole runtime.
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* @warning In order to use this, you must assure that the read access is atomic.
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*/
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extern volatile uint64_t global_tick_ms;
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/**
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* @brief Wait counter for the display. This must not be used anywhere else
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*/
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extern volatile uint32_t lcd_tick_100us;
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/**
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* @brief Setup the Systick timer to generate a 100 us tick
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*/
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void systick_setup(void);
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/**
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* @brief Wait for x milliseconds
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*
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* This function is not reentrant and must not be called from an interrupt
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*
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* @warning Do not use in interrupt context
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* @param ms wait time in ms
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*/
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void systick_wait_ms(uint32_t ms);
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/**
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* @brief Get the gloabl millisecond tick. This can be used to implement all sorts of time based procedures / waits.
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* @warning Use this with care in interrupts. It may lead to race conditions. It is generally safe for use in standard program flow though.
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* @return Global millisecond tick.
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*/
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uint64_t systick_get_global_tick(void);
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/**
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* @brief Calculate the uptime from the current millisecond tick.
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* @param[out] days Days. May be NULL.
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* @param[out] hours Hours. May be NULL.
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* @param[out] minutes Minutes. May be NULL.
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* @param[out] seconds Seconds. May be NULL.
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*/
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void systick_get_uptime_from_tick(uint32_t *days, uint32_t *hours, uint32_t *minutes, uint32_t *seconds);
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/**
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* @brief Check if \p ticks (milliseconds) have passed since \p start_timestamp
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* @param start_timestamp Start timestamp
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* @param ticks tick count
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* @return true: Time has passed
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*/
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bool systick_ticks_have_passed(uint64_t start_timestamp, uint64_t ticks);
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#endif /* __SYSTICK_H__ */
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