133 lines
4.7 KiB
C
133 lines
4.7 KiB
C
/*
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* Copyright (c) 2015, 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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* \addtogroup tsch
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* @{
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*/
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#ifndef __TSCH_SLOT_OPERATION_H__
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#define __TSCH_SLOT_OPERATION_H__
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/********** Includes **********/
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#include "contiki.h"
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#include "lib/ringbufindex.h"
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#include "net/mac/tsch/tsch-packet.h"
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#include "net/mac/tsch/tsch-private.h"
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/******** Configuration *******/
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/* Size of the ring buffer storing dequeued outgoing packets (only an array of pointers).
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* Must be power of two, and greater or equal to QUEUEBUF_NUM */
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#ifdef TSCH_CONF_DEQUEUED_ARRAY_SIZE
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#define TSCH_DEQUEUED_ARRAY_SIZE TSCH_CONF_DEQUEUED_ARRAY_SIZE
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#else
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/* By default, round QUEUEBUF_CONF_NUM to next power of two
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* (in the range [4;256]) */
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#if QUEUEBUF_CONF_NUM <= 4
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#define TSCH_DEQUEUED_ARRAY_SIZE 4
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#elif QUEUEBUF_CONF_NUM <= 8
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#define TSCH_DEQUEUED_ARRAY_SIZE 8
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#elif QUEUEBUF_CONF_NUM <= 16
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#define TSCH_DEQUEUED_ARRAY_SIZE 16
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#elif QUEUEBUF_CONF_NUM <= 32
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#define TSCH_DEQUEUED_ARRAY_SIZE 32
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#elif QUEUEBUF_CONF_NUM <= 64
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#define TSCH_DEQUEUED_ARRAY_SIZE 64
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#elif QUEUEBUF_CONF_NUM <= 128
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#define TSCH_DEQUEUED_ARRAY_SIZE 128
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#else
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#define TSCH_DEQUEUED_ARRAY_SIZE 256
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#endif
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#endif
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/* Size of the ring buffer storing incoming packets.
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* Must be power of two */
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#ifdef TSCH_CONF_MAX_INCOMING_PACKETS
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#define TSCH_MAX_INCOMING_PACKETS TSCH_CONF_MAX_INCOMING_PACKETS
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#else
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#define TSCH_MAX_INCOMING_PACKETS 4
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#endif
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/*********** Callbacks *********/
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/* Called by TSCH form interrupt after receiving a frame, enabled upper-layer to decide
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* whether to ACK or NACK */
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#ifdef TSCH_CALLBACK_DO_NACK
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int TSCH_CALLBACK_DO_NACK(struct tsch_link *link, linkaddr_t *src, linkaddr_t *dst);
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#endif
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/************ Types ***********/
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/* Stores data about an incoming packet */
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struct input_packet {
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uint8_t payload[TSCH_PACKET_MAX_LEN]; /* Packet payload */
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struct tsch_asn_t rx_asn; /* ASN when the packet was received */
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int len; /* Packet len */
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int16_t rssi; /* RSSI for this packet */
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uint8_t channel; /* Channel we received the packet on */
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};
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/***** External Variables *****/
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/* A ringbuf storing outgoing packets after they were dequeued.
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* Will be processed layer by tsch_tx_process_pending */
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extern struct ringbufindex dequeued_ringbuf;
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extern struct tsch_packet *dequeued_array[TSCH_DEQUEUED_ARRAY_SIZE];
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/* A ringbuf storing incoming packets.
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* Will be processed layer by tsch_rx_process_pending */
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extern struct ringbufindex input_ringbuf;
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extern struct input_packet input_array[TSCH_MAX_INCOMING_PACKETS];
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/* Last clock_time_t where synchronization happened */
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extern clock_time_t last_sync_time;
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/********** Functions *********/
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/* Returns a 802.15.4 channel from an ASN and channel offset */
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uint8_t tsch_calculate_channel(struct tsch_asn_t *asn, uint8_t channel_offset);
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/* Is TSCH locked? */
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int tsch_is_locked(void);
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/* Lock TSCH (no link operation) */
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int tsch_get_lock(void);
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/* Release TSCH lock */
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void tsch_release_lock(void);
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/* Set global time before starting slot operation,
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* with a rtimer time and an ASN */
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void tsch_slot_operation_sync(rtimer_clock_t next_slot_start,
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struct tsch_asn_t *next_slot_asn);
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/* Start actual slot operation */
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void tsch_slot_operation_start(void);
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#endif /* __TSCH_SLOT_OPERATION_H__ */
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/** @} */
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