osd-contiki/core/net/mac/tsch/tsch-slot-operation.h

119 lines
4.5 KiB
C

/*
* 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.
*
*/
#ifndef __TSCH_SLOT_OPERATION_H__
#define __TSCH_SLOT_OPERATION_H__
/********** Includes **********/
#include "contiki.h"
#include "lib/ringbufindex.h"
#include "net/mac/tsch/tsch-packet.h"
#include "net/mac/tsch/tsch-private.h"
/******** Configuration *******/
/* Size of the ring buffer storing dequeued outgoing packets (only an array of pointers).
* Must be power of two, and greater or equal to QUEUEBUF_NUM */
#ifdef TSCH_CONF_DEQUEUED_ARRAY_SIZE
#define TSCH_DEQUEUED_ARRAY_SIZE TSCH_CONF_DEQUEUED_ARRAY_SIZE
#else
#define TSCH_DEQUEUED_ARRAY_SIZE 16
#endif
/* Size of the ring buffer storing incoming packets.
* Must be power of two */
#ifdef TSCH_CONF_MAX_INCOMING_PACKETS
#define TSCH_MAX_INCOMING_PACKETS TSCH_CONF_MAX_INCOMING_PACKETS
#else
#define TSCH_MAX_INCOMING_PACKETS 4
#endif
/* Use SFD timestamp for synchronization? By default we merely rely on rtimer and busy wait
* until SFD is high, which we found to provide greater accuracy on JN516x and CC2420.
* Note: for association, however, we always use SFD timestamp to know the time of arrival
* of the EB (because we do not busy-wait for the whole scanning process)
* */
#ifdef TSCH_CONF_RESYNC_WITH_SFD_TIMESTAMPS
#define TSCH_RESYNC_WITH_SFD_TIMESTAMPS TSCH_CONF_RESYNC_WITH_SFD_TIMESTAMPS
#else
#define TSCH_RESYNC_WITH_SFD_TIMESTAMPS 0
#endif
/*********** Callbacks *********/
/* Called by TSCH form interrupt after receiving a frame, enabled upper-layer to decide
* whether to ACK or NACK */
#ifdef TSCH_CALLBACK_DO_NACK
int TSCH_CALLBACK_DO_NACK(struct tsch_link *link, linkaddr_t *src, linkaddr_t *dst);
#endif
/************ Types ***********/
/* Stores data about an incoming packet */
struct input_packet {
uint8_t payload[TSCH_PACKET_MAX_LEN]; /* Packet payload */
struct asn_t rx_asn; /* ASN when the packet was received */
int len; /* Packet len */
uint16_t rssi; /* RSSI for this packet */
};
/***** External Variables *****/
/* A ringbuf storing outgoing packets after they were dequeued.
* Will be processed layer by tsch_tx_process_pending */
extern struct ringbufindex dequeued_ringbuf;
extern struct tsch_packet *dequeued_array[TSCH_DEQUEUED_ARRAY_SIZE];
/* A ringbuf storing incoming packets.
* Will be processed layer by tsch_rx_process_pending */
extern struct ringbufindex input_ringbuf;
extern struct input_packet input_array[TSCH_MAX_INCOMING_PACKETS];
/********** Functions *********/
/* Returns a 802.15.4 channel from an ASN and channel offset */
uint8_t tsch_calculate_channel(struct asn_t *asn, uint8_t channel_offset);
/* Is TSCH locked? */
int tsch_is_locked(void);
/* Lock TSCH (no link operation) */
int tsch_get_lock(void);
/* Release TSCH lock */
void tsch_release_lock(void);
/* Set global time before starting slot operation,
* with a rtimer time and an ASN */
void tsch_slot_operation_sync(rtimer_clock_t next_slot_start,
struct asn_t *next_slot_asn);
/* Start actual slot operation */
void tsch_slot_operation_start(void);
#endif /* __TSCH_SLOT_OPERATION_H__ */