108 lines
3.6 KiB
C
108 lines
3.6 KiB
C
/*
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* Copyright (c) 2007, Swedish Institute of Computer Science.
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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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* $Id: mac.h,v 1.10 2010/02/03 01:17:32 adamdunkels Exp $
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*/
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/**
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* \file
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* MAC driver header file
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#ifndef __MAC_H__
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#define __MAC_H__
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#include "dev/radio.h"
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/**
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* The structure of a MAC protocol driver in Contiki.
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*/
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struct mac_driver {
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char *name;
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/** Initialize the MAC driver */
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const struct mac_driver *(* init)(const struct radio_driver *r);
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/** Send a packet from the Rime buffer */
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int (* send)(void);
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/** Read a received packet into the Rime buffer. */
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int (* read)(void);
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/** Set a function to be called when a packet has been received. */
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void (* set_receive_function)(void (*f)(const struct mac_driver *d));
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/** Turn the MAC layer on. */
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int (* on)(void);
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/** Turn the MAC layer off. */
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int (* off)(int keep_radio_on);
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/** Returns the channel check interval, expressed in clock_time_t ticks. */
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unsigned short (* channel_check_interval)(void);
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};
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/* Generic MAC return values. */
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enum {
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/**< The MAC layer transmission was OK. */
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MAC_TX_OK,
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/**< The MAC layer transmission could not be performed due to a
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collision. */
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MAC_TX_COLLISION,
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/**< The MAC layer did not get an acknowledgement for the packet. */
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MAC_TX_NOACK,
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/**< The MAC layer transmission could not be performed because of an
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error. The upper layer may try again later. */
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MAC_TX_ERR,
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/**< The MAC layer transmission could not be performed because of a
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fatal error. The upper layer does not need to try again, as the
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error will be fatal then as well. */
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MAC_TX_ERR_FATAL,
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};
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#ifdef MAC_CONF_CHANNEL_CHECK_RATE
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#define MAC_CHANNEL_CHECK_RATE MAC_CONF_CHANNEL_CHECK_RATE
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#else /* MAC_CHANNEL_CHECK_RATE */
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#define MAC_CHANNEL_CHECK_RATE 4
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#endif /* MAC_CHANNEL_CHECK_RATE */
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#if (MAC_CHANNEL_CHECK_RATE & (MAC_CHANNEL_CHECK_RATE - 1)) != 0
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#error MAC_CONF_CHANNEL_CHECK_RATE must be a power of two (i.e., 1, 2, 4, 8, 16, 32, 64, ...).
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#error Change MAC_CONF_CHANNEL_CHECK_RATE in contiki-conf.h or in your Makefile.
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#endif
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#endif /* __MAC_H__ */
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