contiki/core/net/mac/nullrdc-framer.c

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/*
* Copyright (c) 2010, 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: nullrdc-framer.c,v 1.3 2010/06/14 19:19:17 adamdunkels Exp $
*/
/**
* \file
* A null RDC implementation that uses framer for headers.
* \author
* Adam Dunkels <adam@sics.se>
* Niclas Finne <nfi@sics.se>
*/
#include "net/mac/nullrdc-framer.h"
#include "net/packetbuf.h"
#include "net/netstack.h"
#include "sys/rtimer.h"
#include "dev/watchdog.h"
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
#ifndef NULLRDC_FRAMER_802154_AUTOACK
#ifdef NULLRDC_FRAMER_CONF_802154_AUTOACK
#define NULLRDC_FRAMER_802154_AUTOACK NULLRDC_FRAMER_CONF_802154_AUTOACK
#else
#define NULLRDC_FRAMER_802154_AUTOACK 0
#endif /* NULLRDC_FRAMER_CONF_802154_AUTOACK */
#endif /* NULLRDC_FRAMER_802154_AUTOACK */
#define ACK_WAIT_TIME RTIMER_SECOND / 2500
#define AFTER_ACK_DETECTED_WAIT_TIME RTIMER_SECOND / 1500
#define ACK_LEN 3
/*---------------------------------------------------------------------------*/
static void
send_packet(mac_callback_t sent, void *ptr)
{
int ret;
packetbuf_set_addr(PACKETBUF_ADDR_SENDER, &rimeaddr_node_addr);
#if NULLRDC_FRAMER_802154_AUTOACK
packetbuf_set_attr(PACKETBUF_ATTR_MAC_ACK, 1);
#endif /* NULLRDC_FRAMER_802154_AUTOACK */
if(NETSTACK_FRAMER.create() == 0) {
/* Failed to allocate space for headers */
PRINTF("nullrdc_framer: send failed, too large header\n");
ret = MAC_TX_ERR_FATAL;
} else {
#if NULLRDC_FRAMER_802154_AUTOACK
int is_broadcast;
uint8_t dsn;
dsn = ((uint8_t *)packetbuf_hdrptr())[2] & 0xff;
NETSTACK_RADIO.prepare(packetbuf_hdrptr(), packetbuf_totlen());
is_broadcast = rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
&rimeaddr_null);
if(NETSTACK_RADIO.receiving_packet() ||
(!is_broadcast && NETSTACK_RADIO.pending_packet())) {
/* Currently receiving a packet over air or the radio has
already received a packet that needs to be read before
sending with auto ack. */
ret = MAC_TX_COLLISION;
} else {
switch(NETSTACK_RADIO.transmit(packetbuf_totlen())) {
case RADIO_TX_OK:
if(is_broadcast) {
ret = MAC_TX_OK;
} else {
rtimer_clock_t wt;
/* Check for ack */
wt = RTIMER_NOW();
watchdog_periodic();
while(RTIMER_CLOCK_LT(RTIMER_NOW(), wt + ACK_WAIT_TIME));
ret = MAC_TX_NOACK;
if(NETSTACK_RADIO.receiving_packet() ||
NETSTACK_RADIO.pending_packet() ||
NETSTACK_RADIO.channel_clear() == 0) {
int len;
uint8_t ackbuf[ACK_LEN];
wt = RTIMER_NOW();
watchdog_periodic();
while(RTIMER_CLOCK_LT(RTIMER_NOW(),
wt + AFTER_ACK_DETECTED_WAIT_TIME));
if(NETSTACK_RADIO.pending_packet()) {
len = NETSTACK_RADIO.read(ackbuf, ACK_LEN);
if(len == ACK_LEN && ackbuf[2] == dsn) {
/* Ack received */
ret = MAC_TX_OK;
} else {
/* Not an ack or ack not for us: collision */
ret = MAC_TX_COLLISION;
}
}
}
}
break;
case RADIO_TX_COLLISION:
ret = MAC_TX_COLLISION;
break;
default:
ret = MAC_TX_ERR;
break;
}
}
#else /* ! NULLRDC_FRAMER_802154_AUTOACK */
switch(NETSTACK_RADIO.send(packetbuf_hdrptr(), packetbuf_totlen())) {
case RADIO_TX_OK:
ret = MAC_TX_OK;
break;
case RADIO_TX_COLLISION:
ret = MAC_TX_COLLISION;
break;
default:
ret = MAC_TX_ERR;
break;
}
#endif /* ! NULLRDC_FRAMER_802154_AUTOACK */
}
mac_call_sent_callback(sent, ptr, ret, 1);
}
/*---------------------------------------------------------------------------*/
static void
packet_input(void)
{
#if NULLRDC_FRAMER_802154_AUTOACK
if(packetbuf_datalen() == ACK_LEN) {
/* Ignore ack packets */
/* PRINTF("nullrdc_framer: ignored ack\n"); */
} else
#endif /* NULLRDC_FRAMER_802154_AUTOACK */
if(NETSTACK_FRAMER.parse() == 0) {
PRINTF("nullrdc_framer: failed to parse %u\n", packetbuf_datalen());
} else {
NETSTACK_MAC.input();
}
}
/*---------------------------------------------------------------------------*/
static int
on(void)
{
return NETSTACK_RADIO.on();
}
/*---------------------------------------------------------------------------*/
static int
off(int keep_radio_on)
{
if(keep_radio_on) {
return NETSTACK_RADIO.on();
} else {
return NETSTACK_RADIO.off();
}
}
/*---------------------------------------------------------------------------*/
static unsigned short
channel_check_interval(void)
{
return 0;
}
/*---------------------------------------------------------------------------*/
static void
init(void)
{
on();
}
/*---------------------------------------------------------------------------*/
const struct rdc_driver nullrdc_framer_driver = {
"nullrdc-framer",
init,
send_packet,
packet_input,
on,
off,
channel_check_interval,
};
/*---------------------------------------------------------------------------*/