77 lines
2.8 KiB
C
77 lines
2.8 KiB
C
/*
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* Copyright (c) 2015, SICS Swedish ICT.
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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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*/
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/**
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* \addtogroup tsch
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* @{
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* \file
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* TSCH adaptive time synchronization
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*/
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#ifndef __TSCH_ADAPTIVE_TIMESYNC_H__
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#define __TSCH_ADAPTIVE_TIMESYNC_H__
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/********** Includes **********/
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#include "contiki.h"
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/***** External Variables *****/
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/** \brief The neighbor last used as our time source */
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extern struct tsch_neighbor *last_timesource_neighbor;
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/********** Functions *********/
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/**
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* \brief Updates timesync information for a given neighbor
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* \param n The neighbor
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* \param time_delta_asn ASN time delta since last synchronization, i.e. number of slots elapsed
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* \param drift_correction The measured drift in ticks since last synchronization
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*/
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void tsch_timesync_update(struct tsch_neighbor *n, uint16_t time_delta_asn, int32_t drift_correction);
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/**
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* \brief Computes time compensation for a given point in the future
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* \param delta_ticks The number of ticks in the future we want to calculate compensation for
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* \return The time compensation
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*/
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int32_t tsch_timesync_adaptive_compensate(rtimer_clock_t delta_ticks);
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/**
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* \brief Gives the estimated clock drift w.r.t. the time source in PPM (parts per million)
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* \return The time drift in PPM
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*/
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long int tsch_adaptive_timesync_get_drift_ppm(void);
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#endif /* __TSCH_ADAPTIVE_TIMESYNC_H__ */
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/** @} */
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