nes-proj/os/net/mac/tsch/tsch-timeslot-timing.c
2018-10-04 13:07:25 +02:00

80 lines
2.7 KiB
C

/*
* Copyright (c) 2018, RISE SICS.
* 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.
*
*/
/**
* \file
* IEEE 802.15.4 TSCH timeslot timings
* \author
* Simon Duquennoy <simon.duquennoy@ri.se>
*
*/
/**
* \addtogroup tsch
* @{
*/
#include "contiki.h"
#include "net/mac/tsch/tsch.h"
/**
* \brief 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:
* TxOffset: 2120
* RxOffset: 1120
* RxWait: 2200
*
* Instead, we align the Rx guard time on expected Tx time. The Rx
* guard time is user-configurable with TSCH_CONF_RX_WAIT.
* (TxOffset - (RxWait / 2)) instead
*/
const uint16_t tsch_timeslot_timing_us_10000[tsch_ts_elements_count] = {
1800, /* CCAOffset */
128, /* CCA */
2120, /* TxOffset */
(2120 - (TSCH_CONF_RX_WAIT / 2)), /* RxOffset */
800, /* RxAckDelay */
1000, /* TxAckDelay */
TSCH_CONF_RX_WAIT, /* RxWait */
400, /* AckWait */
192, /* RxTx */
2400, /* MaxAck */
4256, /* MaxTx */
10000, /* TimeslotLength */
};
/** @} */