// Copyright (c) 2011, XMOS Ltd, All rights reserved
// This software is freely distributable under a derivative of the
// University of Illinois/NCSA Open Source License posted in
// LICENSE.txt and at <http://github.xcore.com/>


/**
 * \defgroup clock Clock interface
 *
 * The clock interface is the interface between the \ref timer "timer library"
 * and the platform specific clock functionality. The clock
 * interface must be implemented for each platform that uses the \ref
 * timer "timer library".
 *
 * The clock interface does only one this: it measures time. The clock
 * interface provides a macro, CLOCK_SECOND, which corresponds to one
 * second of system time.
 *
 * \sa \ref timer "Timer library"
 *
 * @{
 */

/*
 * Copyright (c) 2004, Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * 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 of the Institute 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 INSTITUTE 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 INSTITUTE 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.
 *
 * This file is part of the uIP TCP/IP stack
 *
 * Author: Adam Dunkels <adam@sics.se>
 *
 * $Id: clock.h,v 1.3 2006/06/11 21:46:39 adam Exp $
 */
#ifndef __CLOCK_H__
#define __CLOCK_H__

#include "clock-arch.h"
/**
 * A second, measured in system clock time.
 *
 * \hideinitializer
 */
#ifdef CLOCK_CONF_SECOND
#define CLOCK_SECOND CLOCK_CONF_SECOND
#else
#define CLOCK_SECOND (clock_time_t)32
#endif

/**
 * Initialize the clock library.
 *
 * This function initializes the clock library and should be called
 * from the main() function of the system.
 *
 */
void clock_init(void);

/**
 * Get the current clock time.
 *
 * This function returns the current system clock time.
 *
 * \return The current clock time, measured in system ticks.
 */
clock_time_t clock_time(void);

/**
 * Get the current value of the platform seconds.
 *
 * This could be the number of seconds since startup, or
 * since a standard epoch.
 *
 * \return The value.
 */
unsigned long clock_seconds(void);

/**
 * Set the value of the platform seconds.
 * \param sec   The value to set.
 *
 */
void clock_set_seconds(unsigned long sec);

/**
 * Update the current system second counter
 *
 */
void upd_clock_seconds(void);


#endif /* __CLOCK_H__ */

/** @} */
