260 lines
7.9 KiB
C
260 lines
7.9 KiB
C
/*
|
|
* 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.c,v 1.4 2010/11/23 18:11:00 nifi 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.h"
|
|
#include "net/packetbuf.h"
|
|
#include "net/netstack.h"
|
|
|
|
#define DEBUG 0
|
|
#if DEBUG
|
|
#include <stdio.h>
|
|
#define PRINTF(...) printf(__VA_ARGS__)
|
|
#else
|
|
#define PRINTF(...)
|
|
#endif
|
|
|
|
#ifndef NULLRDC_802154_AUTOACK
|
|
#ifdef NULLRDC_CONF_802154_AUTOACK
|
|
#define NULLRDC_802154_AUTOACK NULLRDC_CONF_802154_AUTOACK
|
|
#else
|
|
#define NULLRDC_802154_AUTOACK 0
|
|
#endif /* NULLRDC_CONF_802154_AUTOACK */
|
|
#endif /* NULLRDC_802154_AUTOACK */
|
|
|
|
#if NULLRDC_802154_AUTOACK
|
|
#include "sys/rtimer.h"
|
|
#include "dev/watchdog.h"
|
|
|
|
#define ACK_WAIT_TIME RTIMER_SECOND / 2500
|
|
#define AFTER_ACK_DETECTED_WAIT_TIME RTIMER_SECOND / 1500
|
|
#define ACK_LEN 3
|
|
|
|
struct seqno {
|
|
rimeaddr_t sender;
|
|
uint8_t seqno;
|
|
};
|
|
|
|
#ifdef NETSTACK_CONF_MAC_SEQNO_HISTORY
|
|
#define MAX_SEQNOS NETSTACK_CONF_MAC_SEQNO_HISTORY
|
|
#else /* NETSTACK_CONF_MAC_SEQNO_HISTORY */
|
|
#define MAX_SEQNOS 16
|
|
#endif /* NETSTACK_CONF_MAC_SEQNO_HISTORY */
|
|
|
|
static struct seqno received_seqnos[MAX_SEQNOS];
|
|
#endif /* NULLRDC_802154_AUTOACK */
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
send_packet(mac_callback_t sent, void *ptr)
|
|
{
|
|
int ret;
|
|
packetbuf_set_addr(PACKETBUF_ADDR_SENDER, &rimeaddr_node_addr);
|
|
#if NULLRDC_802154_AUTOACK
|
|
packetbuf_set_attr(PACKETBUF_ATTR_MAC_ACK, 1);
|
|
#endif /* NULLRDC_802154_AUTOACK */
|
|
|
|
if(NETSTACK_FRAMER.create() == 0) {
|
|
/* Failed to allocate space for headers */
|
|
PRINTF("nullrdc: send failed, too large header\n");
|
|
ret = MAC_TX_ERR_FATAL;
|
|
} else {
|
|
|
|
#if NULLRDC_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_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_802154_AUTOACK */
|
|
}
|
|
mac_call_sent_callback(sent, ptr, ret, 1);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
packet_input(void)
|
|
{
|
|
#if NULLRDC_802154_AUTOACK
|
|
if(packetbuf_datalen() == ACK_LEN) {
|
|
/* Ignore ack packets */
|
|
/* PRINTF("nullrdc: ignored ack\n"); */
|
|
} else
|
|
#endif /* NULLRDC_802154_AUTOACK */
|
|
if(NETSTACK_FRAMER.parse() == 0) {
|
|
PRINTF("nullrdc: failed to parse %u\n", packetbuf_datalen());
|
|
} else {
|
|
#if NULLRDC_802154_AUTOACK
|
|
/* Check for duplicate packet by comparing the sequence number
|
|
of the incoming packet with the last few ones we saw. */
|
|
int i;
|
|
for(i = 0; i < MAX_SEQNOS; ++i) {
|
|
if(packetbuf_attr(PACKETBUF_ATTR_PACKET_ID) == received_seqnos[i].seqno &&
|
|
rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_SENDER),
|
|
&received_seqnos[i].sender)) {
|
|
/* Drop the packet. */
|
|
PRINTF("nullrdc: drop duplicate link layer packet %u\n",
|
|
packetbuf_attr(PACKETBUF_ATTR_PACKET_ID));
|
|
return;
|
|
}
|
|
}
|
|
for(i = MAX_SEQNOS - 1; i > 0; --i) {
|
|
memcpy(&received_seqnos[i], &received_seqnos[i - 1],
|
|
sizeof(struct seqno));
|
|
}
|
|
received_seqnos[0].seqno = packetbuf_attr(PACKETBUF_ATTR_PACKET_ID);
|
|
rimeaddr_copy(&received_seqnos[0].sender,
|
|
packetbuf_addr(PACKETBUF_ADDR_SENDER));
|
|
#endif /* NULLRDC_802154_AUTOACK */
|
|
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_driver = {
|
|
"nullrdc",
|
|
init,
|
|
send_packet,
|
|
packet_input,
|
|
on,
|
|
off,
|
|
channel_check_interval,
|
|
};
|
|
/*---------------------------------------------------------------------------*/
|