forked from Archive/PX4-Autopilot
103 lines
4.0 KiB
C
103 lines
4.0 KiB
C
|
/********************************************************************************
|
||
|
|
* sched/clock_time2ticks.c
|
||
|
|
*
|
||
|
|
* Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
|
||
|
|
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
*
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in
|
||
|
|
* the documentation and/or other materials provided with the
|
||
|
|
* distribution.
|
||
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
||
|
|
* used to endorse or promote products derived from this software
|
||
|
|
* without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*
|
||
|
|
********************************************************************************/
|
||
|
|
|
||
|
|
/********************************************************************************
|
||
|
|
* Included Files
|
||
|
|
********************************************************************************/
|
||
|
|
|
||
|
|
#include <nuttx/config.h>
|
||
|
|
|
||
|
|
#include <stdint.h>
|
||
|
|
#include <time.h>
|
||
|
|
|
||
|
|
#include "clock_internal.h"
|
||
|
|
|
||
|
|
/********************************************************************************
|
||
|
|
* Definitions
|
||
|
|
********************************************************************************/
|
||
|
|
|
||
|
|
/********************************************************************************
|
||
|
|
* Private Type Declarations
|
||
|
|
********************************************************************************/
|
||
|
|
|
||
|
|
/********************************************************************************
|
||
|
|
* Global Variables
|
||
|
|
********************************************************************************/
|
||
|
|
|
||
|
|
/********************************************************************************
|
||
|
|
* Private Variables
|
||
|
|
********************************************************************************/
|
||
|
|
|
||
|
|
/********************************************************************************
|
||
|
|
* Private Functions
|
||
|
|
********************************************************************************/
|
||
|
|
|
||
|
|
/********************************************************************************
|
||
|
|
* Public Functions
|
||
|
|
********************************************************************************/
|
||
|
|
|
||
|
|
/********************************************************************************
|
||
|
|
* Function: clock_time2ticks
|
||
|
|
*
|
||
|
|
* Description:
|
||
|
|
* Convert a timespec delay to system timer ticks. This function is suitable
|
||
|
|
* for calculating relative time delays and does not depend on the other
|
||
|
|
* clock_* logic.
|
||
|
|
*
|
||
|
|
* Parameters:
|
||
|
|
* reltime - Convert this relative time to system clock ticks.
|
||
|
|
* ticks - Return the converted number of ticks here.
|
||
|
|
*
|
||
|
|
* Return Value:
|
||
|
|
* Always returns OK
|
||
|
|
*
|
||
|
|
* Assumptions:
|
||
|
|
*
|
||
|
|
********************************************************************************/
|
||
|
|
|
||
|
|
int clock_time2ticks(FAR const struct timespec *reltime, FAR int *ticks)
|
||
|
|
{
|
||
|
|
int32_t relusec;
|
||
|
|
|
||
|
|
/* Convert the relative time into microseconds.*/
|
||
|
|
|
||
|
|
relusec = reltime->tv_sec * USEC_PER_SEC + reltime->tv_nsec / NSEC_PER_USEC;
|
||
|
|
|
||
|
|
/* Convert microseconds to clock ticks */
|
||
|
|
|
||
|
|
*ticks = relusec / USEC_PER_TICK;
|
||
|
|
return OK;
|
||
|
|
}
|