2015-09-21 20:01:01 +00:00
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/*
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* Copyright (c) 2014, 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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* \file
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* IEEE 802.15.4 TSCH MAC schedule manager.
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* \author
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* Simon Duquennoy <simonduq@sics.se>
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* Beshr Al Nahas <beshr@sics.se>
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*/
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#include "contiki.h"
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#include "dev/leds.h"
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#include "lib/memb.h"
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#include "net/nbr-table.h"
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#include "net/packetbuf.h"
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#include "net/queuebuf.h"
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#include "net/mac/tsch/tsch.h"
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#include "net/mac/tsch/tsch-queue.h"
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#include "net/mac/tsch/tsch-private.h"
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#include "net/mac/tsch/tsch-packet.h"
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#include "net/mac/tsch/tsch-schedule.h"
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#include "net/mac/tsch/tsch-log.h"
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2017-05-16 16:20:34 +00:00
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#include "net/mac/framer/frame802154.h"
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2015-09-21 20:01:01 +00:00
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#include "sys/process.h"
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#include "sys/rtimer.h"
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#include <string.h>
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2017-06-20 16:06:30 +00:00
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/* Log configuration */
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#include "sys/log.h"
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2017-06-23 19:12:36 +00:00
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#define LOG_MODULE "TSCH Sched"
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2017-06-20 16:06:30 +00:00
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#define LOG_LEVEL MAC_LOG_LEVEL
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2015-09-21 20:01:01 +00:00
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/* Pre-allocated space for links */
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MEMB(link_memb, struct tsch_link, TSCH_SCHEDULE_MAX_LINKS);
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/* Pre-allocated space for slotframes */
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MEMB(slotframe_memb, struct tsch_slotframe, TSCH_SCHEDULE_MAX_SLOTFRAMES);
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/* List of slotframes (each slotframe holds its own list of links) */
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LIST(slotframe_list);
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/* Adds and returns a slotframe (NULL if failure) */
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struct tsch_slotframe *
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tsch_schedule_add_slotframe(uint16_t handle, uint16_t size)
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{
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if(size == 0) {
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return NULL;
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}
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if(tsch_schedule_get_slotframe_by_handle(handle)) {
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/* A slotframe with this handle already exists */
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return NULL;
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}
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if(tsch_get_lock()) {
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struct tsch_slotframe *sf = memb_alloc(&slotframe_memb);
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if(sf != NULL) {
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/* Initialize the slotframe */
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sf->handle = handle;
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2016-12-14 15:50:28 +00:00
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TSCH_ASN_DIVISOR_INIT(sf->size, size);
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2015-09-21 20:01:01 +00:00
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LIST_STRUCT_INIT(sf, links_list);
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/* Add the slotframe to the global list */
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list_add(slotframe_list, sf);
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}
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2017-06-20 16:06:30 +00:00
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LOG_INFO("add_slotframe %u %u\n",
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2015-09-21 20:01:01 +00:00
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handle, size);
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tsch_release_lock();
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return sf;
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}
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return NULL;
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}
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/*---------------------------------------------------------------------------*/
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/* Removes all slotframes, resulting in an empty schedule */
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int
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tsch_schedule_remove_all_slotframes(void)
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{
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struct tsch_slotframe *sf;
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while((sf = list_head(slotframe_list))) {
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if(tsch_schedule_remove_slotframe(sf) == 0) {
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return 0;
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}
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}
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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/* Removes a slotframe Return 1 if success, 0 if failure */
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int
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tsch_schedule_remove_slotframe(struct tsch_slotframe *slotframe)
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{
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if(slotframe != NULL) {
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/* Remove all links belonging to this slotframe */
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struct tsch_link *l;
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while((l = list_head(slotframe->links_list))) {
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tsch_schedule_remove_link(slotframe, l);
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}
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/* Now that the slotframe has no links, remove it. */
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if(tsch_get_lock()) {
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2017-06-20 16:06:30 +00:00
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LOG_INFO("remove slotframe %u %u\n", slotframe->handle, slotframe->size.val);
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2015-09-21 20:01:01 +00:00
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memb_free(&slotframe_memb, slotframe);
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list_remove(slotframe_list, slotframe);
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tsch_release_lock();
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return 1;
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}
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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/* Looks for a slotframe from a handle */
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struct tsch_slotframe *
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tsch_schedule_get_slotframe_by_handle(uint16_t handle)
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{
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if(!tsch_is_locked()) {
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struct tsch_slotframe *sf = list_head(slotframe_list);
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while(sf != NULL) {
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if(sf->handle == handle) {
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return sf;
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}
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sf = list_item_next(sf);
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}
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}
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return NULL;
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}
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/*---------------------------------------------------------------------------*/
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/* Looks for a link from a handle */
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struct tsch_link *
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tsch_schedule_get_link_by_handle(uint16_t handle)
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{
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if(!tsch_is_locked()) {
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struct tsch_slotframe *sf = list_head(slotframe_list);
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while(sf != NULL) {
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struct tsch_link *l = list_head(sf->links_list);
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/* Loop over all items. Assume there is max one link per timeslot */
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while(l != NULL) {
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if(l->handle == handle) {
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return l;
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}
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l = list_item_next(l);
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}
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sf = list_item_next(sf);
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}
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}
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return NULL;
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}
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/*---------------------------------------------------------------------------*/
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/* Adds a link to a slotframe, return a pointer to it (NULL if failure) */
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struct tsch_link *
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tsch_schedule_add_link(struct tsch_slotframe *slotframe,
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uint8_t link_options, enum link_type link_type, const linkaddr_t *address,
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uint16_t timeslot, uint16_t channel_offset)
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{
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struct tsch_link *l = NULL;
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if(slotframe != NULL) {
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/* We currently support only one link per timeslot in a given slotframe. */
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/* Start with removing the link currently installed at this timeslot (needed
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* to keep neighbor state in sync with link options etc.) */
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tsch_schedule_remove_link_by_timeslot(slotframe, timeslot);
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if(!tsch_get_lock()) {
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2017-06-20 16:06:30 +00:00
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LOG_ERR("! add_link memb_alloc couldn't take lock\n");
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2015-09-21 20:01:01 +00:00
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} else {
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l = memb_alloc(&link_memb);
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if(l == NULL) {
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2017-06-20 16:06:30 +00:00
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LOG_ERR("! add_link memb_alloc failed\n");
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2016-03-31 08:09:47 +00:00
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tsch_release_lock();
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2015-09-21 20:01:01 +00:00
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} else {
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static int current_link_handle = 0;
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struct tsch_neighbor *n;
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/* Add the link to the slotframe */
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list_add(slotframe->links_list, l);
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/* Initialize link */
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l->handle = current_link_handle++;
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l->link_options = link_options;
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l->link_type = link_type;
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l->slotframe_handle = slotframe->handle;
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l->timeslot = timeslot;
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l->channel_offset = channel_offset;
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l->data = NULL;
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if(address == NULL) {
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address = &linkaddr_null;
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}
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linkaddr_copy(&l->addr, address);
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2017-06-23 19:12:36 +00:00
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LOG_INFO("add_link %u %u %u %u %u ",
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slotframe->handle, link_options, link_type, timeslot, channel_offset);
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LOG_INFO_LLADDR(address);
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LOG_INFO_("\n");
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2015-09-21 20:01:01 +00:00
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/* Release the lock before we update the neighbor (will take the lock) */
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tsch_release_lock();
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if(l->link_options & LINK_OPTION_TX) {
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n = tsch_queue_add_nbr(&l->addr);
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/* We have a tx link to this neighbor, update counters */
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if(n != NULL) {
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n->tx_links_count++;
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if(!(l->link_options & LINK_OPTION_SHARED)) {
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n->dedicated_tx_links_count++;
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}
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}
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}
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}
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}
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}
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return l;
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}
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/*---------------------------------------------------------------------------*/
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/* Removes a link from slotframe. Return 1 if success, 0 if failure */
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int
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tsch_schedule_remove_link(struct tsch_slotframe *slotframe, struct tsch_link *l)
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{
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if(slotframe != NULL && l != NULL && l->slotframe_handle == slotframe->handle) {
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if(tsch_get_lock()) {
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uint8_t link_options;
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linkaddr_t addr;
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/* Save link option and addr in local variables as we need them
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* after freeing the link */
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link_options = l->link_options;
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linkaddr_copy(&addr, &l->addr);
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/* The link to be removed is scheduled as next, set it to NULL
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* to abort the next link operation */
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if(l == current_link) {
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current_link = NULL;
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}
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2017-06-23 19:12:36 +00:00
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LOG_INFO("remove_link %u %u %u %u ",
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slotframe->handle, l->link_options, l->timeslot, l->channel_offset);
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LOG_INFO_LLADDR(&l->addr);
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LOG_INFO_("\n");
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2015-09-21 20:01:01 +00:00
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list_remove(slotframe->links_list, l);
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memb_free(&link_memb, l);
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/* Release the lock before we update the neighbor (will take the lock) */
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tsch_release_lock();
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/* This was a tx link to this neighbor, update counters */
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if(link_options & LINK_OPTION_TX) {
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struct tsch_neighbor *n = tsch_queue_add_nbr(&addr);
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if(n != NULL) {
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n->tx_links_count--;
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if(!(link_options & LINK_OPTION_SHARED)) {
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n->dedicated_tx_links_count--;
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}
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}
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}
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return 1;
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} else {
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2017-06-20 16:06:30 +00:00
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LOG_ERR("! remove_link memb_alloc couldn't take lock\n");
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2015-09-21 20:01:01 +00:00
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}
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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/* Removes a link from slotframe and timeslot. Return a 1 if success, 0 if failure */
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int
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tsch_schedule_remove_link_by_timeslot(struct tsch_slotframe *slotframe, uint16_t timeslot)
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{
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return slotframe != NULL &&
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tsch_schedule_remove_link(slotframe, tsch_schedule_get_link_by_timeslot(slotframe, timeslot));
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}
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/*---------------------------------------------------------------------------*/
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/* Looks within a slotframe for a link with a given timeslot */
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struct tsch_link *
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tsch_schedule_get_link_by_timeslot(struct tsch_slotframe *slotframe, uint16_t timeslot)
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{
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if(!tsch_is_locked()) {
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if(slotframe != NULL) {
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struct tsch_link *l = list_head(slotframe->links_list);
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/* Loop over all items. Assume there is max one link per timeslot */
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while(l != NULL) {
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if(l->timeslot == timeslot) {
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return l;
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}
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l = list_item_next(l);
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}
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return l;
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}
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}
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return NULL;
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}
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/*---------------------------------------------------------------------------*/
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/* Returns the next active link after a given ASN, and a backup link (for the same ASN, with Rx flag) */
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struct tsch_link *
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2016-12-14 15:50:28 +00:00
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tsch_schedule_get_next_active_link(struct tsch_asn_t *asn, uint16_t *time_offset,
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2015-09-21 20:01:01 +00:00
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struct tsch_link **backup_link)
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{
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uint16_t time_to_curr_best = 0;
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struct tsch_link *curr_best = NULL;
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struct tsch_link *curr_backup = NULL; /* Keep a back link in case the current link
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turns out useless when the time comes. For instance, for a Tx-only link, if there is
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no outgoing packet in queue. In that case, run the backup link instead. The backup link
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must have Rx flag set. */
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if(!tsch_is_locked()) {
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struct tsch_slotframe *sf = list_head(slotframe_list);
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/* For each slotframe, look for the earliest occurring link */
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while(sf != NULL) {
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/* Get timeslot from ASN, given the slotframe length */
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2016-12-14 15:50:28 +00:00
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uint16_t timeslot = TSCH_ASN_MOD(*asn, sf->size);
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2015-09-21 20:01:01 +00:00
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struct tsch_link *l = list_head(sf->links_list);
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while(l != NULL) {
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uint16_t time_to_timeslot =
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l->timeslot > timeslot ?
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l->timeslot - timeslot :
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sf->size.val + l->timeslot - timeslot;
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if(curr_best == NULL || time_to_timeslot < time_to_curr_best) {
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time_to_curr_best = time_to_timeslot;
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curr_best = l;
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|
|
|
curr_backup = NULL;
|
|
|
|
} else if(time_to_timeslot == time_to_curr_best) {
|
|
|
|
struct tsch_link *new_best = NULL;
|
|
|
|
/* Two links are overlapping, we need to select one of them.
|
|
|
|
* By standard: prioritize Tx links first, second by lowest handle */
|
|
|
|
if((curr_best->link_options & LINK_OPTION_TX) == (l->link_options & LINK_OPTION_TX)) {
|
|
|
|
/* Both or neither links have Tx, select the one with lowest handle */
|
|
|
|
if(l->slotframe_handle < curr_best->slotframe_handle) {
|
|
|
|
new_best = l;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* Select the link that has the Tx option */
|
|
|
|
if(l->link_options & LINK_OPTION_TX) {
|
|
|
|
new_best = l;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Maintain backup_link */
|
|
|
|
if(curr_backup == NULL) {
|
|
|
|
/* Check if 'l' best can be used as backup */
|
|
|
|
if(new_best != l && (l->link_options & LINK_OPTION_RX)) { /* Does 'l' have Rx flag? */
|
|
|
|
curr_backup = l;
|
|
|
|
}
|
|
|
|
/* Check if curr_best can be used as backup */
|
|
|
|
if(new_best != curr_best && (curr_best->link_options & LINK_OPTION_RX)) { /* Does curr_best have Rx flag? */
|
|
|
|
curr_backup = curr_best;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Maintain curr_best */
|
|
|
|
if(new_best != NULL) {
|
|
|
|
curr_best = new_best;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
l = list_item_next(l);
|
|
|
|
}
|
|
|
|
sf = list_item_next(sf);
|
|
|
|
}
|
|
|
|
if(time_offset != NULL) {
|
|
|
|
*time_offset = time_to_curr_best;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if(backup_link != NULL) {
|
|
|
|
*backup_link = curr_backup;
|
|
|
|
}
|
|
|
|
return curr_best;
|
|
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
/* Module initialization, call only once at startup. Returns 1 is success, 0 if failure. */
|
|
|
|
int
|
|
|
|
tsch_schedule_init(void)
|
|
|
|
{
|
|
|
|
if(tsch_get_lock()) {
|
|
|
|
memb_init(&link_memb);
|
|
|
|
memb_init(&slotframe_memb);
|
|
|
|
list_init(slotframe_list);
|
|
|
|
tsch_release_lock();
|
|
|
|
return 1;
|
|
|
|
} else {
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
/* Create a 6TiSCH minimal schedule */
|
|
|
|
void
|
|
|
|
tsch_schedule_create_minimal(void)
|
|
|
|
{
|
|
|
|
struct tsch_slotframe *sf_min;
|
|
|
|
/* First, empty current schedule */
|
|
|
|
tsch_schedule_remove_all_slotframes();
|
|
|
|
/* Build 6TiSCH minimal schedule.
|
|
|
|
* We pick a slotframe length of TSCH_SCHEDULE_DEFAULT_LENGTH */
|
|
|
|
sf_min = tsch_schedule_add_slotframe(0, TSCH_SCHEDULE_DEFAULT_LENGTH);
|
|
|
|
/* Add a single Tx|Rx|Shared slot using broadcast address (i.e. usable for unicast and broadcast).
|
|
|
|
* We set the link type to advertising, which is not compliant with 6TiSCH minimal schedule
|
|
|
|
* but is required according to 802.15.4e if also used for EB transmission.
|
|
|
|
* Timeslot: 0, channel offset: 0. */
|
|
|
|
tsch_schedule_add_link(sf_min,
|
|
|
|
LINK_OPTION_RX | LINK_OPTION_TX | LINK_OPTION_SHARED | LINK_OPTION_TIME_KEEPING,
|
|
|
|
LINK_TYPE_ADVERTISING, &tsch_broadcast_address,
|
|
|
|
0, 0);
|
|
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
/* Prints out the current schedule (all slotframes and links) */
|
|
|
|
void
|
|
|
|
tsch_schedule_print(void)
|
|
|
|
{
|
|
|
|
if(!tsch_is_locked()) {
|
|
|
|
struct tsch_slotframe *sf = list_head(slotframe_list);
|
|
|
|
|
|
|
|
printf("Schedule: slotframe list\n");
|
|
|
|
|
|
|
|
while(sf != NULL) {
|
|
|
|
struct tsch_link *l = list_head(sf->links_list);
|
|
|
|
|
|
|
|
printf("[Slotframe] Handle %u, size %u\n", sf->handle, sf->size.val);
|
|
|
|
printf("List of links:\n");
|
|
|
|
|
|
|
|
while(l != NULL) {
|
|
|
|
printf("[Link] Options %02x, type %u, timeslot %u, channel offset %u, address %u\n",
|
|
|
|
l->link_options, l->link_type, l->timeslot, l->channel_offset, l->addr.u8[7]);
|
|
|
|
l = list_item_next(l);
|
|
|
|
}
|
|
|
|
|
|
|
|
sf = list_item_next(sf);
|
|
|
|
}
|
|
|
|
|
|
|
|
printf("Schedule: end of slotframe list\n");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|