104 lines
3.4 KiB
C
104 lines
3.4 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: nullmac.c,v 1.4 2007/10/23 21:27:57 adamdunkels Exp $
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*/
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/**
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* \file
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* A MAC protocol that does not do anything.
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include "net/mac/nullmac.h"
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#include "net/rime/rimebuf.h"
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static const struct radio_driver *radio;
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static void (* receiver_callback)(const struct mac_driver *);
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/*---------------------------------------------------------------------------*/
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static int
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send(void)
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{
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return radio->send(rimebuf_hdrptr(), rimebuf_totlen());
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}
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/*---------------------------------------------------------------------------*/
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static void
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input(const struct radio_driver *d)
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{
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receiver_callback(&nullmac_driver);
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}
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/*---------------------------------------------------------------------------*/
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static int
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read(void)
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{
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int len;
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rimebuf_clear();
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len = radio->read(rimebuf_dataptr(), RIMEBUF_SIZE);
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rimebuf_set_datalen(len);
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return len;
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}
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/*---------------------------------------------------------------------------*/
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static void
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set_receive_function(void (* recv)(const struct mac_driver *))
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{
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receiver_callback = recv;
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}
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/*---------------------------------------------------------------------------*/
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static int
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on(void)
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{
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return radio->on();
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}
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/*---------------------------------------------------------------------------*/
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static int
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off(void)
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{
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return radio->off();
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}
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/*---------------------------------------------------------------------------*/
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const struct mac_driver nullmac_driver = {
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send,
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read,
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set_receive_function,
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on,
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off,
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};
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/*---------------------------------------------------------------------------*/
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const struct mac_driver *
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nullmac_init(const struct radio_driver *d)
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{
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radio = d;
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radio->set_receive_function(input);
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radio->on();
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return &nullmac_driver;
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}
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/*---------------------------------------------------------------------------*/
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