osd-contiki/core/net/mac/nullmac.c

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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: nullmac.c,v 1.13 2010/01/25 11:43:32 adamdunkels Exp $
*/
/**
* \file
* A MAC protocol that does not do anything.
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "net/mac/nullmac.h"
#include "net/rime/packetbuf.h"
static const struct radio_driver *radio;
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static void (* receiver_callback)(const struct mac_driver *);
/*---------------------------------------------------------------------------*/
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static int
send_packet(void)
{
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if(radio->send(packetbuf_hdrptr(), packetbuf_totlen()) == RADIO_TX_OK) {
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return MAC_TX_OK;
}
return MAC_TX_ERR;
}
/*---------------------------------------------------------------------------*/
static void
input_packet(const struct radio_driver *d)
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{
if(receiver_callback) {
receiver_callback(&nullmac_driver);
}
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}
/*---------------------------------------------------------------------------*/
static int
read_packet(void)
{
int len;
packetbuf_clear();
len = radio->read(packetbuf_dataptr(), PACKETBUF_SIZE);
packetbuf_set_datalen(len);
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return len;
}
/*---------------------------------------------------------------------------*/
static void
set_receive_function(void (* recv)(const struct mac_driver *))
{
receiver_callback = recv;
}
/*---------------------------------------------------------------------------*/
static int
on(void)
{
return radio->on();
}
/*---------------------------------------------------------------------------*/
static int
off(int keep_radio_on)
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{
if(keep_radio_on) {
return radio->on();
} else {
return radio->off();
}
}
/*---------------------------------------------------------------------------*/
static unsigned short
channel_check_interval(void)
{
return 0;
}
/*---------------------------------------------------------------------------*/
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const struct mac_driver nullmac_driver = {
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"nullmac",
nullmac_init,
send_packet,
read_packet,
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set_receive_function,
on,
off,
channel_check_interval,
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};
/*---------------------------------------------------------------------------*/
const struct mac_driver *
nullmac_init(const struct radio_driver *d)
{
radio = d;
radio->set_receive_function(input_packet);
radio->on();
return &nullmac_driver;
}
/*---------------------------------------------------------------------------*/