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/*
* File : cputime.h
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2017, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2017-12-23 Bernard first version
*/
#include <rtdevice.h>
#include <rtthread.h>
static const struct rt_clock_cputime_ops *_cputime_ops = RT_NULL;
/**
* The clock_cpu_getres() function shall return the resolution of CPU time, the
* number of nanosecond per tick.
*
* @return the number of nanosecond per tick
*/
float clock_cpu_getres(void)
{
if (_cputime_ops)
return _cputime_ops->cputime_getres();
rt_set_errno(-ENOSYS);
return 0;
}
/**
* The clock_cpu_gettime() function shall return the current value of cpu time tick.
*
* @return the cpu tick
*/
uint32_t clock_cpu_gettime(void)
{
if (_cputime_ops)
return _cputime_ops->cputime_gettime();
rt_set_errno(-ENOSYS);
return 0;
}
/**
* The clock_cpu_microsecond() fucntion shall return the microsecond according to
* cpu_tick parameter.
*
* @param cpu_tick the cpu tick
*
* @return the microsecond
*/
uint32_t clock_cpu_microsecond(uint32_t cpu_tick)
{
float unit = clock_cpu_getres();
return (cpu_tick * unit) / 1000;
}
/**
* The clock_cpu_microsecond() fucntion shall return the millisecond according to
* cpu_tick parameter.
*
* @param cpu_tick the cpu tick
*
* @return the millisecond
*/
uint32_t clock_cpu_millisecond(uint32_t cpu_tick)
{
float unit = clock_cpu_getres();
return (cpu_tick * unit) / (1000 * 1000);
}
/**
* The clock_cpu_seops() function shall set the ops of cpu time.
*
* @return always return 0.
*/
int clock_cpu_setops(const struct rt_clock_cputime_ops *ops)
{
_cputime_ops = ops;
if (ops)
{
RT_ASSERT(ops->cputime_getres != RT_NULL);
RT_ASSERT(ops->cputime_gettime != RT_NULL);
}
return 0;
}
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