tsch-const.h

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/*
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/**
* \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/netstack.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 length equal to the length of the packet buffer */
#define TSCH_PACKET_MAX_LEN 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_timing_us[tsch_ts_timeslot_length])

/* Calculate packet tx/rx duration in rtimer ticks based on packet length in bytes. */
#define TSCH_PACKET_DURATION(len) US_TO_RTIMERTICKS(RADIO_BYTE_AIR_TIME * ((len) + RADIO_PHY_OVERHEAD))

/* 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 - 1) / timeslot_length)

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