142 lines
4.6 KiB
C
142 lines
4.6 KiB
C
/****************************************************************************
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* sched/clock/clock_systimespec.c
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <time.h>
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#include <nuttx/arch.h>
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#include <nuttx/clock.h>
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#include "clock/clock.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: clock_systimespec
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*
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* Description:
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* Return the current value of the system timer counter as a struct
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* timespec.
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*
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* Parameters:
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* ts - Location to return the time
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*
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* Return Value:
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* Current version always returns OK
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*
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* Assumptions:
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*
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****************************************************************************/
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int clock_systimespec(FAR struct timespec *ts)
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{
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#ifdef CONFIG_RTC_HIRES
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/* Do we have a high-resolution RTC that can provide us with the time? */
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if (g_rtc_enabled)
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{
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/* Get the hi-resolution time from the RTC */
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return up_rtc_gettime(ts);
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}
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else
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#endif
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{
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#if defined(CONFIG_SCHED_TICKLESS)
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/* In tickless mode, all timing is controlled by platform-specific
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* code. Let the platform timer do the work.
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*/
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return up_timer_gettime(ts);
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#elif defined(CONFIG_HAVE_LONG_LONG) && (CONFIG_USEC_PER_TICK % 1000) != 0
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/* 64-bit microsecond calculations should improve our accuracy. */
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uint64_t usecs;
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uint64_t secs;
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uint64_t nsecs;
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/* Get the time since power-on in seconds and milliseconds */
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usecs = TICK2MSEC(clock_systimer());
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secs = usecs / USEC_PER_SEC;
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/* Return the elapsed time in seconds and nanoseconds */
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nsecs = (usecs - (secs * USEC_PER_SEC)) * NSEC_PER_USEC;
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ts->tv_sec = (time_t)secs;
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ts->tv_nsec = (long)nsecs;
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return OK;
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#else
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/* 32-bit millisecond calculations should be just fine. */
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uint32_t msecs;
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uint32_t secs;
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uint32_t nsecs;
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/* Get the time since power-on in seconds and milliseconds */
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msecs = TICK2MSEC(clock_systimer());
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secs = msecs / MSEC_PER_SEC;
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/* Return the elapsed time in seconds and nanoseconds */
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nsecs = (msecs - (secs * MSEC_PER_SEC)) * NSEC_PER_MSEC;
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ts->tv_sec = (time_t)secs;
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ts->tv_nsec = (long)nsecs;
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return OK;
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#endif
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}
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}
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