osd-contiki/core/net/mac/mac.h

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/*
* Copyright (c) 2007, Swedish Institute of Computer Science.
* 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.
*
* $Id: mac.h,v 1.11 2010/02/03 16:45:12 adamdunkels Exp $
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*/
/**
* \file
* MAC driver header file
* \author
* Adam Dunkels <adam@sics.se>
*/
#ifndef __MAC_H__
#define __MAC_H__
#include "contiki-conf.h"
#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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*/
struct mac_driver {
char *name;
/** Initialize the MAC driver */
const struct mac_driver *(* init)(const struct radio_driver *r);
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/** Send a packet from the Rime buffer */
int (* send)(void);
/** Read a received packet into the Rime buffer. */
int (* read)(void);
/** Set a function to be called when a packet has been received. */
void (* set_receive_function)(void (*f)(const struct mac_driver *d));
/** Turn the MAC layer on. */
int (* on)(void);
/** Turn the MAC layer off. */
int (* off)(int keep_radio_on);
/** Returns the channel check interval, expressed in clock_time_t ticks. */
unsigned short (* channel_check_interval)(void);
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};
/* Generic MAC return values. */
enum {
/**< The MAC layer transmission was OK. */
MAC_TX_OK,
/**< The MAC layer transmission could not be performed due to a
collision. */
MAC_TX_COLLISION,
/**< The MAC layer did not get an acknowledgement for the packet. */
MAC_TX_NOACK,
/**< The MAC layer transmission could not be performed because of an
error. The upper layer may try again later. */
MAC_TX_ERR,
/**< The MAC layer transmission could not be performed because of a
fatal error. The upper layer does not need to try again, as the
error will be fatal then as well. */
MAC_TX_ERR_FATAL,
};
#ifndef MAC_CHANNEL_CHECK_RATE
#ifdef MAC_CONF_CHANNEL_CHECK_RATE
#define MAC_CHANNEL_CHECK_RATE MAC_CONF_CHANNEL_CHECK_RATE
#else /* MAC_CONF_CHANNEL_CHECK_RATE */
#define MAC_CHANNEL_CHECK_RATE 4
#endif /* MAC_CONF_CHANNEL_CHECK_RATE */
#endif /* MAC_CHANNEL_CHECK_RATE */
#if (MAC_CHANNEL_CHECK_RATE & (MAC_CHANNEL_CHECK_RATE - 1)) != 0
#error MAC_CONF_CHANNEL_CHECK_RATE must be a power of two (i.e., 1, 2, 4, 8, 16, 32, 64, ...).
#error Change MAC_CONF_CHANNEL_CHECK_RATE in contiki-conf.h or in your Makefile.
#endif
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#endif /* __MAC_H__ */