nes-proj/os/services/tsch-cs/tsch-cs.h

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2017-11-28 14:58:42 +00:00
/*
* Copyright (c) 2016-2018, University of Bristol - http://www.bristol.ac.uk
*
* 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 copyright holder 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.
*
*/
/**
* \file
* Header file for TSCH adaptive channel selection
* \author
* Atis Elsts <atis.elsts@bristol.ac.uk>
*/
#ifndef __TSCH_CS_H__
#define __TSCH_CS_H__
#include "contiki.h"
#include <stdbool.h>
/* If `channel_free_ewma` value is less than this, the channel is considered busy */
#ifdef TSCH_CS_CONF_FREE_THRESHOLD
#define TSCH_CS_FREE_THRESHOLD TSCH_CS_CONF_FREE_THRESHOLD
#else
/* < 85% free */
#define TSCH_CS_FREE_THRESHOLD ((tsch_stat_t)(85ul * TSCH_STATS_BINARY_SCALING_FACTOR / 100))
#endif
#define TSCH_CS_LEARNING_PERIOD_SEC 30
/**
* \brief Initializes the TSCH hopping sequence selection module.
*/
void tsch_cs_adaptations_init(void);
/**
* \brief Signal the need to potentially update the TSCH hopping sequence.
* \param updated_channel The channel with the updated RSSI measurement
* \param old_busyness_metric The EWMA value of the "channel busy" status before the last RSSI measurement
*/
void tsch_cs_channel_stats_updated(uint8_t updated_channel, uint16_t old_busyness_metric);
/**
* \brief Potentially update the TSCH hopping sequence
* \return true if the hopping sequence was updated, false otherwise
*/
bool tsch_cs_process(void);
/* A bit corresponds to a channel; `uint16_t` value is OK for up to 16 channels. */
typedef uint16_t tsch_cs_bitmap_t;
#endif /* __TSCH_CS_H__ */