nes-proj/os/net/mac/tsch/tsch-const.h

/*
 * Copyright (c) 2015, 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 constants
 * \author
 *         Simon Duquennoy <simonduq@sics.se>
 */

#ifndef __TSCH_CONST_H__
#define __TSCH_CONST_H__

/********** Includes **********/
#include "net/packetbuf.h"
#include "net/mac/tsch/tsch-conf.h" /* Required for timestlot timing consts */

/********** Constants **********/

/* Link options */
#define LINK_OPTION_TX              1
#define LINK_OPTION_RX              2
#define LINK_OPTION_SHARED          4
#define LINK_OPTION_TIME_KEEPING    8

/* Default IEEE 802.15.4e hopping sequences, obtained from https://gist.github.com/twatteyne/2e22ee3c1a802b685695 */
/* 16 channels, sequence length 16 */
#define TSCH_HOPPING_SEQUENCE_16_16 (uint8_t[]){ 16, 17, 23, 18, 26, 15, 25, 22, 19, 11, 12, 13, 24, 14, 20, 21 }
/* 4 channels, sequence length 16 */
#define TSCH_HOPPING_SEQUENCE_4_16 (uint8_t[]){ 20, 26, 25, 26, 15, 15, 25, 20, 26, 15, 26, 25, 20, 15, 20, 25 }
/* 4 channels, sequence length 4 */
#define TSCH_HOPPING_SEQUENCE_4_4 (uint8_t[]){ 15, 25, 26, 20 }
/* 2 channels, sequence length 2 */
#define TSCH_HOPPING_SEQUENCE_2_2 (uint8_t[]){ 20, 25 }
/* 1 channel, sequence length 1 */
#define TSCH_HOPPING_SEQUENCE_1_1 (uint8_t[]){ 20 }

/* Max TSCH packet lenght */
#define TSCH_PACKET_MAX_LEN MIN(127, PACKETBUF_SIZE)

/* The jitter to remove in ticks.
 * This should be the sum of measurement errors on Tx and Rx nodes.
 * */
#define TSCH_TIMESYNC_MEASUREMENT_ERROR US_TO_RTIMERTICKS(32)

/* The approximate number of slots per second */
#define TSCH_SLOTS_PER_SECOND (1000000 / TSCH_DEFAULT_TS_TIMESLOT_LENGTH)

/* Calculate packet tx/rx duration in rtimer ticks based on sent
 * packet len in bytes with 802.15.4 250kbps data rate.
 * One byte = 32us. Add two bytes for CRC and one for len field */
#define TSCH_PACKET_DURATION(len) US_TO_RTIMERTICKS(32 * ((len) + 3))

/* Convert rtimer ticks to clock and vice versa */
#define TSCH_CLOCK_TO_TICKS(c) (((c) * RTIMER_SECOND) / CLOCK_SECOND)
#define TSCH_CLOCK_TO_SLOTS(c, timeslot_length) (TSCH_CLOCK_TO_TICKS(c) / timeslot_length)

/* The default timeslot timing in the standard is a guard time of
 * 2200 us, a Tx offset of 2120 us and a Rx offset of 1120 us.
 * As a result, the listening device has a guard time not centered
 * on the expected Tx time. This is to be fixed in the next iteration
 * of the standard. This can be enabled with:
 * #define TSCH_DEFAULT_TS_TX_OFFSET          2120
 * #define TSCH_DEFAULT_TS_RX_OFFSET          1120
 * #define TSCH_DEFAULT_TS_RX_WAIT            2200
 *
 * Instead, we align the Rx guard time on expected Tx time. The Rx
 * guard time is user-configurable with TSCH_CONF_RX_WAIT.

 * (TS_TX_OFFSET - (TS_RX_WAIT / 2)) instead */

#if TSCH_CONF_DEFAULT_TIMESLOT_LENGTH == 10000
/* Default timeslot timing as per IEEE 802.15.4e */

#define TSCH_DEFAULT_TS_CCA_OFFSET         1800
#define TSCH_DEFAULT_TS_CCA                128
#define TSCH_DEFAULT_TS_TX_OFFSET          2120
#define TSCH_DEFAULT_TS_RX_OFFSET          (TSCH_DEFAULT_TS_TX_OFFSET - (TSCH_CONF_RX_WAIT / 2))
#define TSCH_DEFAULT_TS_RX_ACK_DELAY       800
#define TSCH_DEFAULT_TS_TX_ACK_DELAY       1000
#define TSCH_DEFAULT_TS_RX_WAIT            TSCH_CONF_RX_WAIT
#define TSCH_DEFAULT_TS_ACK_WAIT           400
#define TSCH_DEFAULT_TS_RX_TX              192
#define TSCH_DEFAULT_TS_MAX_ACK            2400
#define TSCH_DEFAULT_TS_MAX_TX             4256
#define TSCH_DEFAULT_TS_TIMESLOT_LENGTH    10000

#elif TSCH_CONF_DEFAULT_TIMESLOT_LENGTH == 15000
/* Default timeslot timing for platforms requiring 15ms slots */

#define TSCH_DEFAULT_TS_CCA_OFFSET         1800
#define TSCH_DEFAULT_TS_CCA                128
#define TSCH_DEFAULT_TS_TX_OFFSET          4000
#define TSCH_DEFAULT_TS_RX_OFFSET          (TSCH_DEFAULT_TS_TX_OFFSET - (TSCH_CONF_RX_WAIT / 2))
#define TSCH_DEFAULT_TS_RX_ACK_DELAY       3600
#define TSCH_DEFAULT_TS_TX_ACK_DELAY       4000
#define TSCH_DEFAULT_TS_RX_WAIT            TSCH_CONF_RX_WAIT
#define TSCH_DEFAULT_TS_ACK_WAIT           800
#define TSCH_DEFAULT_TS_RX_TX              2072
#define TSCH_DEFAULT_TS_MAX_ACK            2400
#define TSCH_DEFAULT_TS_MAX_TX             4256
#define TSCH_DEFAULT_TS_TIMESLOT_LENGTH    15000

#elif TSCH_CONF_DEFAULT_TIMESLOT_LENGTH == 65000U
/* 65ms timeslot, i.e. nearly the max length allowed by standard (16-bit unsigned in micro-seconds).
 * Useful for running link-layer security on sky in Cooja, where only S/W security is supported.
 * Note: this slot timing would require a total of 120ms. If a slot overlaps with the next active slot,
 * the latter will be skipped.
 * This configuration is mostly a work-around to test link-layer security in Cooja, it is recommended
 * to use it with a 6TiSCH minimal schedule of length >= 2. */

#define TSCH_DEFAULT_TS_CCA_OFFSET         1800
#define TSCH_DEFAULT_TS_CCA                128
#define TSCH_DEFAULT_TS_TX_OFFSET          52000
#define TSCH_DEFAULT_TS_RX_OFFSET          (TSCH_DEFAULT_TS_TX_OFFSET - (TSCH_CONF_RX_WAIT / 2))
#define TSCH_DEFAULT_TS_RX_ACK_DELAY       58600
#define TSCH_DEFAULT_TS_TX_ACK_DELAY       59000
#define TSCH_DEFAULT_TS_RX_WAIT            TSCH_CONF_RX_WAIT
#define TSCH_DEFAULT_TS_ACK_WAIT           800
#define TSCH_DEFAULT_TS_RX_TX              2072
#define TSCH_DEFAULT_TS_MAX_ACK            2400
#define TSCH_DEFAULT_TS_MAX_TX             4256
#define TSCH_DEFAULT_TS_TIMESLOT_LENGTH    65000

#else
#error "TSCH: Unsupported default timeslot length"
#endif

#endif /* __TSCH_CONST_H__ */
/** @} */