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3bd78893e5
nullrdc (previously nullrdc-framer) is now a RDC implementation that does not do any radio duty cycling but supports link layer addresses and frame format via framer (for example 802.15.4). nullrdc can now be used in the same way as contikimac, xmac, etc. nullrdc-noframer (previously nullrdc) is a null RDC implementation that does not do any radio duty cycling, does not add any header of its own to the packets, and does not support link layer addresses.
255 lines
7.7 KiB
C
255 lines
7.7 KiB
C
/*
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* Copyright (c) 2010, 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: nullrdc.c,v 1.4 2010/11/23 18:11:00 nifi Exp $
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*/
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/**
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* \file
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* A null RDC implementation that uses framer for headers.
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* \author
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* Adam Dunkels <adam@sics.se>
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* Niclas Finne <nfi@sics.se>
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*/
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#include "net/mac/nullrdc.h"
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#include "net/packetbuf.h"
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#include "net/netstack.h"
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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#ifndef NULLRDC_802154_AUTOACK
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#ifdef NULLRDC_CONF_802154_AUTOACK
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#define NULLRDC_802154_AUTOACK NULLRDC_CONF_802154_AUTOACK
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#else
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#define NULLRDC_802154_AUTOACK 0
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#endif /* NULLRDC_CONF_802154_AUTOACK */
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#endif /* NULLRDC_802154_AUTOACK */
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#if NULLRDC_802154_AUTOACK
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#include "sys/rtimer.h"
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#include "dev/watchdog.h"
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#define ACK_WAIT_TIME RTIMER_SECOND / 2500
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#define AFTER_ACK_DETECTED_WAIT_TIME RTIMER_SECOND / 1500
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#define ACK_LEN 3
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struct seqno {
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rimeaddr_t sender;
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uint8_t seqno;
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};
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#define MAX_SEQNOS 8
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static struct seqno received_seqnos[MAX_SEQNOS];
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#endif /* NULLRDC_802154_AUTOACK */
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/*---------------------------------------------------------------------------*/
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static void
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send_packet(mac_callback_t sent, void *ptr)
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{
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int ret;
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packetbuf_set_addr(PACKETBUF_ADDR_SENDER, &rimeaddr_node_addr);
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#if NULLRDC_802154_AUTOACK
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packetbuf_set_attr(PACKETBUF_ATTR_MAC_ACK, 1);
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#endif /* NULLRDC_802154_AUTOACK */
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if(NETSTACK_FRAMER.create() == 0) {
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/* Failed to allocate space for headers */
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PRINTF("nullrdc: send failed, too large header\n");
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ret = MAC_TX_ERR_FATAL;
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} else {
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#if NULLRDC_802154_AUTOACK
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int is_broadcast;
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uint8_t dsn;
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dsn = ((uint8_t *)packetbuf_hdrptr())[2] & 0xff;
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NETSTACK_RADIO.prepare(packetbuf_hdrptr(), packetbuf_totlen());
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is_broadcast = rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
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&rimeaddr_null);
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if(NETSTACK_RADIO.receiving_packet() ||
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(!is_broadcast && NETSTACK_RADIO.pending_packet())) {
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/* Currently receiving a packet over air or the radio has
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already received a packet that needs to be read before
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sending with auto ack. */
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ret = MAC_TX_COLLISION;
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} else {
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switch(NETSTACK_RADIO.transmit(packetbuf_totlen())) {
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case RADIO_TX_OK:
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if(is_broadcast) {
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ret = MAC_TX_OK;
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} else {
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rtimer_clock_t wt;
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/* Check for ack */
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wt = RTIMER_NOW();
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watchdog_periodic();
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while(RTIMER_CLOCK_LT(RTIMER_NOW(), wt + ACK_WAIT_TIME));
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ret = MAC_TX_NOACK;
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if(NETSTACK_RADIO.receiving_packet() ||
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NETSTACK_RADIO.pending_packet() ||
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NETSTACK_RADIO.channel_clear() == 0) {
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int len;
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uint8_t ackbuf[ACK_LEN];
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wt = RTIMER_NOW();
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watchdog_periodic();
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while(RTIMER_CLOCK_LT(RTIMER_NOW(),
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wt + AFTER_ACK_DETECTED_WAIT_TIME));
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if(NETSTACK_RADIO.pending_packet()) {
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len = NETSTACK_RADIO.read(ackbuf, ACK_LEN);
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if(len == ACK_LEN && ackbuf[2] == dsn) {
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/* Ack received */
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ret = MAC_TX_OK;
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} else {
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/* Not an ack or ack not for us: collision */
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ret = MAC_TX_COLLISION;
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}
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}
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}
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}
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break;
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case RADIO_TX_COLLISION:
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ret = MAC_TX_COLLISION;
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break;
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default:
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ret = MAC_TX_ERR;
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break;
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}
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}
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#else /* ! NULLRDC_802154_AUTOACK */
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switch(NETSTACK_RADIO.send(packetbuf_hdrptr(), packetbuf_totlen())) {
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case RADIO_TX_OK:
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ret = MAC_TX_OK;
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break;
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case RADIO_TX_COLLISION:
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ret = MAC_TX_COLLISION;
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break;
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default:
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ret = MAC_TX_ERR;
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break;
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}
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#endif /* ! NULLRDC_802154_AUTOACK */
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}
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mac_call_sent_callback(sent, ptr, ret, 1);
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}
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/*---------------------------------------------------------------------------*/
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static void
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packet_input(void)
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{
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#if NULLRDC_802154_AUTOACK
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if(packetbuf_datalen() == ACK_LEN) {
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/* Ignore ack packets */
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/* PRINTF("nullrdc: ignored ack\n"); */
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} else
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#endif /* NULLRDC_802154_AUTOACK */
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if(NETSTACK_FRAMER.parse() == 0) {
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PRINTF("nullrdc: failed to parse %u\n", packetbuf_datalen());
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} else {
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#if NULLRDC_802154_AUTOACK
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/* Check for duplicate packet by comparing the sequence number
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of the incoming packet with the last few ones we saw. */
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int i;
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for(i = 0; i < MAX_SEQNOS; ++i) {
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if(packetbuf_attr(PACKETBUF_ATTR_PACKET_ID) == received_seqnos[i].seqno &&
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rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_SENDER),
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&received_seqnos[i].sender)) {
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/* Drop the packet. */
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PRINTF("nullrdc: drop duplicate link layer packet %u\n",
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packetbuf_attr(PACKETBUF_ATTR_PACKET_ID));
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return;
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}
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}
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for(i = MAX_SEQNOS - 1; i > 0; --i) {
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memcpy(&received_seqnos[i], &received_seqnos[i - 1],
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sizeof(struct seqno));
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}
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received_seqnos[0].seqno = packetbuf_attr(PACKETBUF_ATTR_PACKET_ID);
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rimeaddr_copy(&received_seqnos[0].sender,
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packetbuf_addr(PACKETBUF_ADDR_SENDER));
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#endif /* NULLRDC_802154_AUTOACK */
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NETSTACK_MAC.input();
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}
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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 NETSTACK_RADIO.on();
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}
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/*---------------------------------------------------------------------------*/
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static int
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off(int keep_radio_on)
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{
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if(keep_radio_on) {
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return NETSTACK_RADIO.on();
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} else {
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return NETSTACK_RADIO.off();
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}
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}
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/*---------------------------------------------------------------------------*/
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static unsigned short
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channel_check_interval(void)
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{
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static void
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init(void)
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{
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on();
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}
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/*---------------------------------------------------------------------------*/
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const struct rdc_driver nullrdc_driver = {
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"nullrdc",
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init,
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send_packet,
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packet_input,
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on,
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off,
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channel_check_interval,
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};
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/*---------------------------------------------------------------------------*/
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