100 lines
1.9 KiB
C
100 lines
1.9 KiB
C
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/*
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* File : clock.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://openlab.rt-thread.com/license/LICENSE
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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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*/
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#include <rtthread.h>
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static rt_tick_t rt_tick;
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static rt_time_t rt_passed_second;
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extern void rt_timer_check(void);
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/**
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* This function will init system tick and set it to zero.
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* @ingroup SystemInit
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*
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*/
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void rt_system_tick_init()
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{
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rt_tick = 0;
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rt_passed_second = 0;
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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()
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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 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()
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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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if (rt_tick % RT_TICK_PER_SECOND == 0)
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{
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++rt_passed_second;
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}
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/* check timer */
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rt_timer_check();
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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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}
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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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*
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* @return the calculated tick
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*/
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rt_tick_t rt_tick_from_millisecond(rt_uint32_t ms)
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{
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/* return the calculated tick */
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return RT_TICK_PER_SECOND * (ms / 1000);
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}
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/*@}*/
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