121 lines
2.5 KiB
C
121 lines
2.5 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2006-03-12 Bernard first version
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* 2006-05-27 Bernard add support for same priority thread schedule
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* 2006-08-10 Bernard remove the last rt_schedule in rt_tick_increase
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* 2010-03-08 Bernard remove rt_passed_second
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* 2010-05-20 Bernard fix the tick exceeds the maximum limits
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* 2010-07-13 Bernard fix rt_tick_from_millisecond issue found by kuronca
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* 2011-06-26 Bernard add rt_tick_set function.
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* 2018-11-22 Jesven add per cpu tick
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*/
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#include <rthw.h>
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#include <rtthread.h>
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static rt_tick_t rt_tick = 0;
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/**
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* This function will initialize system tick and set it to zero.
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* @ingroup SystemInit
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*
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* @deprecated since 1.1.0, this function does not need to be invoked
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* in the system initialization.
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*/
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void rt_system_tick_init(void)
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{
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}
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/**
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* @addtogroup Clock
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*/
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/**@{*/
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/**
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* This function will return current tick from operating system startup
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*
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* @return current tick
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*/
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rt_tick_t rt_tick_get(void)
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{
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/* return the global tick */
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return rt_tick;
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}
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/**
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* This function will set current tick
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*/
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void rt_tick_set(rt_tick_t tick)
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{
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rt_base_t level;
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level = rt_hw_interrupt_disable();
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rt_tick = tick;
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rt_hw_interrupt_enable(level);
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}
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/**
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* This function will notify kernel there is one tick passed. Normally,
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* this function is invoked by clock ISR.
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*/
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void rt_tick_increase(void)
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{
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struct rt_thread *thread;
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/* increase the global tick */
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++ rt_tick;
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/* check time slice */
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thread = rt_thread_self();
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-- thread->remaining_tick;
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if (thread->remaining_tick == 0)
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{
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/* change to initialized tick */
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thread->remaining_tick = thread->init_tick;
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/* yield */
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rt_thread_yield();
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}
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/* check timer */
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rt_timer_check();
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}
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/**
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* This function will calculate the tick from millisecond.
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*
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* @param ms the specified millisecond
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* - Negative Number wait forever
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* - Zero not wait
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* - Max 0x7fffffff
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*
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* @return the calculated tick
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*/
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rt_tick_t rt_tick_from_millisecond(rt_int32_t ms)
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{
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rt_tick_t tick;
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if (ms < 0)
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{
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tick = (rt_tick_t)RT_WAITING_FOREVER;
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}
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else
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{
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tick = RT_TICK_PER_SECOND * (ms / 1000);
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tick += (RT_TICK_PER_SECOND * (ms % 1000) + 999) / 1000;
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}
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/* return the calculated tick */
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return tick;
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}
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/**@}*/
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