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147 lines
4.3 KiB
C
147 lines
4.3 KiB
C
/*
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* Copyright (c) 2004, Swedish Institute of Computer Science.
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* All rights reserved.
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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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* 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 the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be 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 INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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/** \addtogroup sys
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* @{
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*/
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/**
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* \defgroup clock Clock library
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*
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* The clock library is the interface between Contiki and the platform
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* specific clock functionality. The clock library defines a macro,
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* CLOCK_SECOND, to convert seconds into the tick resolution of the platform.
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* Typically this is 1-10 milliseconds, e.g. 4*CLOCK_SECOND could be 512.
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* A 16 bit counter would thus overflow every 1-10 minutes.
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* Platforms use the tick interrupt to maintain a long term count
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* of seconds since startup.
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*
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* Platforms may also implement rtimers for greater time resolution
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* and for real-time interrupts, These use a corresponding RTIMER_SECOND.
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*
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* \note These timers do not necessarily have a common divisor or are phase locked.
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* One may be crystal controlled and the other may not. Low power operation
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* or sleep will often use one for wake and disable the other, then give
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* it a tick correction after wakeup.
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*
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* \note The clock library need in many cases not be used
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* directly. Rather, the \ref timer "timer library", \ref etimer
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* "event timers", or \ref rtimer "rtimer library" should be used.
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*
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* \sa \ref timer "Timer library"
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* \sa \ref etimer "Event timers"
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* \sa \ref rtimer "Realtime library"
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*
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* @{
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*/
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#ifndef CLOCK_H_
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#define CLOCK_H_
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#include "contiki-conf.h"
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/**
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* A second, measured in system clock time.
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*
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* \hideinitializer
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*/
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#ifdef CLOCK_CONF_SECOND
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#define CLOCK_SECOND CLOCK_CONF_SECOND
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#else
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#define CLOCK_SECOND (clock_time_t)32
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#endif
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/**
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* Initialize the clock library.
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*
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* This function initializes the clock library and should be called
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* from the main() function of the system.
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*
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*/
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void clock_init(void);
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/**
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* Get the current clock time.
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*
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* This function returns the current system clock time.
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*
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* \return The current clock time, measured in system ticks.
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*/
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CCIF clock_time_t clock_time(void);
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/**
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* Get the current value of the platform seconds.
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*
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* This could be the number of seconds since startup, or
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* since a standard epoch.
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*
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* \return The value.
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*/
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CCIF unsigned long clock_seconds(void);
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/**
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* Set the value of the platform seconds.
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* \param sec The value to set.
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*
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*/
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void clock_set_seconds(unsigned long sec);
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/**
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* Wait for a given number of ticks.
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* \param t How many ticks.
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*
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*/
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void clock_wait(clock_time_t t);
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/**
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* Delay a given number of microseconds.
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* \param dt How many microseconds to delay.
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*
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* \note Interrupts could increase the delay by a variable amount.
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*/
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void clock_delay_usec(uint16_t dt);
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/**
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* Deprecated platform-specific routines.
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*
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*/
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int clock_fine_max(void);
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unsigned short clock_fine(void);
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void clock_delay(unsigned int delay);
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#endif /* CLOCK_H_ */
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/** @} */
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/** @} */
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