nuttx/sched/clock/clock_ticks2time.c

/****************************************************************************
 * sched/clock/clock_ticks2time.c
 *
 *   Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * 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,
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 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <time.h>
#include "clock/clock.h"

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: clock_ticks2time
 *
 * Description:
 *   Convert the system time tick value to a relative time.
 *
 * Parameters:
 *   ticks - The number of system time ticks to convert.
 *   reltime - Return the converted system time here.
 *
 * Return Value:
 *   Always returns OK
 *
 * Assumptions:
 *
 ****************************************************************************/

int clock_ticks2time(int ticks, FAR struct timespec *reltime)
{
  int remainder;

  reltime->tv_sec  = ticks / TICK_PER_SEC;
  remainder        = ticks - TICK_PER_SEC * reltime->tv_sec;
  reltime->tv_nsec = remainder * NSEC_PER_TICK;
  return OK;
}