nes-proj/core/net/rime/uc.c

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/**
* \addtogroup rimeuc
* @{
*/
/*
* Copyright (c) 2006, 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.
*
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* $Id: uc.c,v 1.10 2007/05/15 08:09:21 adamdunkels Exp $
*/
/**
* \file
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* Single-hop unicast
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "net/rime.h"
#include "net/rime/uc.h"
#include <string.h>
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/* XXX This is a hack: MAC protocols may use this address as the
receiver address of packets. */
rimeaddr_t uc_receiver;
struct uc_hdr {
rimeaddr_t receiver;
};
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#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static void
recv_from_ibc(struct ibc_conn *ibc, rimeaddr_t *from)
{
struct uc_conn *c = (struct uc_conn *)ibc;
struct uc_hdr *hdr = rimebuf_dataptr();
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PRINTF("%d: uc: recv_from_ibc, receiver %d %p hdr %p\n",
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rimeaddr_node_addr.u16, hdr->receiver.u16, c, hdr);
if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_node_addr)) {
rimebuf_hdrreduce(sizeof(struct uc_hdr));
c->u->recv(c, from);
}
}
/*---------------------------------------------------------------------------*/
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static const struct ibc_callbacks uc = {recv_from_ibc};
/*---------------------------------------------------------------------------*/
void
uc_open(struct uc_conn *c, u16_t channel,
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const struct uc_callbacks *u)
{
ibc_open(&c->c, channel, &uc);
c->u = u;
}
/*---------------------------------------------------------------------------*/
void
uc_close(struct uc_conn *c)
{
ibc_close(&c->c);
}
/*---------------------------------------------------------------------------*/
int
uc_send(struct uc_conn *c, rimeaddr_t *receiver)
{
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PRINTF("%d: uc_send to %d\n", rimeaddr_node_addr.u16, receiver->u16);
if(rimebuf_hdralloc(sizeof(struct uc_hdr))) {
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int ret;
struct uc_hdr *hdr = rimebuf_hdrptr();
rimeaddr_copy(&hdr->receiver, receiver);
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rimeaddr_copy(&uc_receiver, receiver);
ret = ibc_send(&c->c);
rimeaddr_copy(&uc_receiver, &rimeaddr_null);
return ret;
}
return 0;
}
/*---------------------------------------------------------------------------*/
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/** @} */