nes-proj/os/net/mac/tsch/tsch-schedule.h
2017-09-29 22:18:48 +02:00

174 lines
6.6 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
* @{
*/
#ifndef __TSCH_SCHEDULE_H__
#define __TSCH_SCHEDULE_H__
/********** Includes **********/
#include "contiki.h"
#include "lib/list.h"
#include "net/mac/tsch/tsch-private.h"
#include "net/mac/tsch/tsch-queue.h"
#include "net/mac/tsch/tsch-slot-operation.h"
#include "net/linkaddr.h"
/******** Configuration *******/
/* Initializes TSCH with a 6TiSCH minimal schedule */
#ifdef TSCH_SCHEDULE_CONF_WITH_6TISCH_MINIMAL
#define TSCH_SCHEDULE_WITH_6TISCH_MINIMAL TSCH_SCHEDULE_CONF_WITH_6TISCH_MINIMAL
#else
#define TSCH_SCHEDULE_WITH_6TISCH_MINIMAL 1
#endif
/* 6TiSCH Minimal schedule slotframe length */
#ifdef TSCH_SCHEDULE_CONF_DEFAULT_LENGTH
#define TSCH_SCHEDULE_DEFAULT_LENGTH TSCH_SCHEDULE_CONF_DEFAULT_LENGTH
#else
#define TSCH_SCHEDULE_DEFAULT_LENGTH 7
#endif
/* Max number of TSCH slotframes */
#ifdef TSCH_SCHEDULE_CONF_MAX_SLOTFRAMES
#define TSCH_SCHEDULE_MAX_SLOTFRAMES TSCH_SCHEDULE_CONF_MAX_SLOTFRAMES
#else
#define TSCH_SCHEDULE_MAX_SLOTFRAMES 4
#endif
/* Max number of links */
#ifdef TSCH_SCHEDULE_CONF_MAX_LINKS
#define TSCH_SCHEDULE_MAX_LINKS TSCH_SCHEDULE_CONF_MAX_LINKS
#else
#define TSCH_SCHEDULE_MAX_LINKS 32
#endif
/********** Constants *********/
/* Link options */
#define LINK_OPTION_TX 1
#define LINK_OPTION_RX 2
#define LINK_OPTION_SHARED 4
#define LINK_OPTION_TIME_KEEPING 8
/************ Types ***********/
/* 802.15.4e link types.
* LINK_TYPE_ADVERTISING_ONLY is an extra one: for EB-only links. */
enum link_type { LINK_TYPE_NORMAL, LINK_TYPE_ADVERTISING, LINK_TYPE_ADVERTISING_ONLY };
struct tsch_link {
/* Links are stored as a list: "next" must be the first field */
struct tsch_link *next;
/* Unique identifier */
uint16_t handle;
/* MAC address of neighbor */
linkaddr_t addr;
/* Slotframe identifier */
uint16_t slotframe_handle;
/* Identifier of Slotframe to which this link belongs
* Unused. */
/* uint8_t handle; */
/* Timeslot for this link */
uint16_t timeslot;
/* Channel offset for this link */
uint16_t channel_offset;
/* A bit string that defines
* b0 = Transmit, b1 = Receive, b2 = Shared, b3 = Timekeeping, b4 = reserved */
uint8_t link_options;
/* Type of link. NORMAL = 0. ADVERTISING = 1, and indicates
the link may be used to send an Enhanced beacon. */
enum link_type link_type;
/* Any other data for upper layers */
void *data;
};
struct tsch_slotframe {
/* Slotframes are stored as a list: "next" must be the first field */
struct tsch_slotframe *next;
/* Unique identifier */
uint16_t handle;
/* Number of timeslots in the slotframe.
* Stored as struct asn_divisor_t because we often need ASN%size */
struct tsch_asn_divisor_t size;
/* List of links belonging to this slotframe */
LIST_STRUCT(links_list);
};
/********** Functions *********/
/* Module initialization, call only once at startup. Returns 1 is success, 0 if failure. */
int tsch_schedule_init(void);
/* Create a 6TiSCH minimal schedule */
void tsch_schedule_create_minimal(void);
/* Prints out the current schedule (all slotframes and links) */
void tsch_schedule_print(void);
/* Adds and returns a slotframe (NULL if failure) */
struct tsch_slotframe *tsch_schedule_add_slotframe(uint16_t handle, uint16_t size);
/* Looks for a slotframe from a handle */
struct tsch_slotframe *tsch_schedule_get_slotframe_by_handle(uint16_t handle);
/* Removes a slotframe Return 1 if success, 0 if failure */
int tsch_schedule_remove_slotframe(struct tsch_slotframe *slotframe);
/* Removes all slotframes, resulting in an empty schedule */
int tsch_schedule_remove_all_slotframes(void);
/* Returns next slotframe */
struct tsch_slotframe *tsch_schedule_slotframes_next(struct tsch_slotframe *sf);
/* Adds a link to a slotframe, return a pointer to it (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);
/* Looks for a link from a handle */
struct tsch_link *tsch_schedule_get_link_by_handle(uint16_t handle);
/* Looks within a slotframe for a link with a given timeslot */
struct tsch_link *tsch_schedule_get_link_by_timeslot(struct tsch_slotframe *slotframe, uint16_t timeslot);
/* Removes a link. Return 1 if success, 0 if failure */
int tsch_schedule_remove_link(struct tsch_slotframe *slotframe, struct tsch_link *l);
/* Removes a link from slotframe and timeslot. Return a 1 if success, 0 if failure */
int tsch_schedule_remove_link_by_timeslot(struct tsch_slotframe *slotframe, uint16_t timeslot);
/* Returns the next active link after a given ASN, and a backup link (for the same ASN, with Rx flag) */
struct tsch_link * tsch_schedule_get_next_active_link(struct tsch_asn_t *asn, uint16_t *time_offset,
struct tsch_link **backup_link);
/* Access to slotframe list */
struct tsch_slotframe *tsch_schedule_slotframe_head(void);
struct tsch_slotframe *tsch_schedule_slotframe_next(struct tsch_slotframe *sf);
#endif /* __TSCH_SCHEDULE_H__ */
/** @} */