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/*
* File : clock.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2009, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2006-03-12 Bernard first version
* 2006-05-27 Bernard add support for same priority thread schedule
* 2006-08-10 Bernard remove the last rt_schedule in rt_tick_increase
* 2010-03-08 Bernard remove rt_passed_second
* 2010-05-20 Bernard fix the tick exceeds the maximum limits
* 2010-07-13 Bernard fix rt_tick_from_millisecond issue found by kuronca
*/
#include <rtthread.h>
static rt_tick_t rt_tick;
extern void rt_timer_check(void);
extern void rt_timer_switch(void);
/**
* This function will init system tick and set it to zero.
* @ingroup SystemInit
*
*/
void rt_system_tick_init()
{
rt_tick = 0;
}
/**
* @addtogroup Clock
*/
/*@{*/
/**
* This function will return current tick from operating system startup
*
* @return current tick
*/
rt_tick_t rt_tick_get()
{
/* return the global tick */
return rt_tick;
}
/**
* This function will notify kernel there is one tick passed. Normally,
* this function is invoked by clock ISR.
*/
void rt_tick_increase()
{
struct rt_thread* thread;
/* increase the global tick */
if (rt_tick == RT_TICK_MAX)
{
/* switch to long timer list */
rt_timer_switch();
rt_tick = 0;
}
else ++ rt_tick;
/* check time slice */
thread = rt_thread_self();
-- thread->remaining_tick;
if (thread->remaining_tick == 0)
{
/* change to initialized tick */
thread->remaining_tick = thread->init_tick;
/* yield */
rt_thread_yield();
}
/* check timer */
rt_timer_check();
}
/**
* This function will calculate the tick from millisecond.
*
* @param ms the specified millisecond
*
* @return the calculated tick
*/
rt_tick_t rt_tick_from_millisecond(rt_uint32_t ms)
{
/* return the calculated tick */
return (RT_TICK_PER_SECOND * ms) / 1000 + (RT_TICK_PER_SECOND * ms) % 1000 ? 1:0;
}
/*@}*/
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