nes-proj/os/net/mac/tsch/tsch-schedule.h
2018-04-28 13:02:11 -07:00

163 lines
6.0 KiB
C

/*
* Copyright (c) 2014, SICS Swedish ICT.
* 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 Contiki operating system.
*
*/
/**
* \addtogroup tsch
* @{
* \file
* TSCH scheduling engine
*/
#ifndef __TSCH_SCHEDULE_H__
#define __TSCH_SCHEDULE_H__
/********** Includes **********/
#include "contiki.h"
#include "net/linkaddr.h"
/********** Functions *********/
/**
* \brief Module initialization, call only once at init
* \return 1 if success, 0 if failure
*/
int tsch_schedule_init(void);
/**
* \brief Create a 6tisch minimal schedule with length TSCH_SCHEDULE_DEFAULT_LENGTH
*/
void tsch_schedule_create_minimal(void);
/**
* \brief Prints out the current schedule (all slotframes and links)
*/
void tsch_schedule_print(void);
/**
* \brief Creates and adds a new slotframe
* \param handle the slotframe handle
* \param size the slotframe size
* \return the new slotframe, NULL if failure
*/
struct tsch_slotframe *tsch_schedule_add_slotframe(uint16_t handle, uint16_t size);
/**
* \brief Looks up a slotframe by handle
* \param handle the slotframe handle
* \return the slotframe with required handle, if any. NULL otherwise.
*/
struct tsch_slotframe *tsch_schedule_get_slotframe_by_handle(uint16_t handle);
/**
* \brief Removes a slotframe
* \param slotframe The slotframe to be removed
* \return 1 if success, 0 if failure
*/
int tsch_schedule_remove_slotframe(struct tsch_slotframe *slotframe);
/**
* \brief Removes all slotframes, resulting in an empty schedule
* \return 1 if success, 0 if failure
*/
int tsch_schedule_remove_all_slotframes(void);
/**
* \brief Adds a link to a slotframe
* \param slotframe The slotframe that will contain the new link
* \param link_options The link options, as a bitfield (LINK_OPTION_* flags)
* \param link_type The link type (advertising, normal)
* \param address The link address of the intended destination. Use &tsch_broadcast_address for a slot towards any neighbor
* \param timeslot The link timeslot within the slotframe
* \param channel_offset The link channel offset
* \return A pointer to the new link, NULL if failure
*/
struct tsch_link *tsch_schedule_add_link(struct tsch_slotframe *slotframe,
uint8_t link_options, enum link_type link_type, const linkaddr_t *address,
uint16_t timeslot, uint16_t channel_offset);
/**
* \brief Looks for a link from a handle
* \param handle The target handle
* \return The link with required handle, if any. Otherwise, NULL
*/
struct tsch_link *tsch_schedule_get_link_by_handle(uint16_t handle);
/**
* \brief Looks within a slotframe for a link with a given timeslot
* \param slotframe The desired slotframe
* \param timeslot The desired timeslot
* \return The link if found, NULL otherwise
*/
struct tsch_link *tsch_schedule_get_link_by_timeslot(struct tsch_slotframe *slotframe, uint16_t timeslot);
/**
* \brief Removes a link
* \param slotframe The slotframe the link belongs to
* \param l The link to be removed
* \return 1 if success, 0 if failure
*/
int tsch_schedule_remove_link(struct tsch_slotframe *slotframe, struct tsch_link *l);
/**
* \brief Removes a link from a slotframe and timeslot
* \param slotframe The slotframe where to look for the link
* \param timeslot The timeslot where to look for the link within the target slotframe
* \return 1 if success, 0 if failure
*/
int tsch_schedule_remove_link_by_timeslot(struct tsch_slotframe *slotframe, uint16_t timeslot);
/**
* \brief Returns the next active link after a given ASN, and a backup link (for the same ASN, with Rx flag)
* \param asn The base ASN, from which we look for the next active link
* \param time_offset A pointer to uint16_t where to store the time offset between base ASN and link found
* \param backup_link A pointer where to write the address of a backup link, to be executed should the original be no longer active at wakeup
* \return The next active link if any, NULL otherwise
*/
struct tsch_link * tsch_schedule_get_next_active_link(struct tsch_asn_t *asn, uint16_t *time_offset,
struct tsch_link **backup_link);
/**
* \brief Access the first item in the list of slotframes
* \return The first slotframe in the schedule if any, NULL otherwise
*/
struct tsch_slotframe *tsch_schedule_slotframe_head(void);
/**
* \brief Access the next item in the list of slotframes
* \param sf The current slotframe (item in the list)
* \return The next slotframe if any, NULL otherwise
*/
struct tsch_slotframe *tsch_schedule_slotframe_next(struct tsch_slotframe *sf);
#endif /* __TSCH_SCHEDULE_H__ */
/** @} */