273 lines
8.4 KiB
C
273 lines
8.4 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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#include <string.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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#ifndef NULLRDC_802154_AUTOACK_HW
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#ifdef NULLRDC_CONF_802154_AUTOACK_HW
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#define NULLRDC_802154_AUTOACK_HW NULLRDC_CONF_802154_AUTOACK_HW
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#else
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#define NULLRDC_802154_AUTOACK_HW 0
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#endif /* NULLRDC_CONF_802154_AUTOACK_HW */
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#endif /* NULLRDC_802154_AUTOACK_HW */
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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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#endif /* NULLRDC_802154_AUTOACK */
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#if NULLRDC_802154_AUTOACK || NULLRDC_802154_AUTOACK_HW
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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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#ifdef NETSTACK_CONF_MAC_SEQNO_HISTORY
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#define MAX_SEQNOS NETSTACK_CONF_MAC_SEQNO_HISTORY
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#else /* NETSTACK_CONF_MAC_SEQNO_HISTORY */
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#define MAX_SEQNOS 16
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#endif /* NETSTACK_CONF_MAC_SEQNO_HISTORY */
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static struct seqno received_seqnos[MAX_SEQNOS];
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#endif /* NULLRDC_802154_AUTOACK || NULLRDC_802154_AUTOACK_HW */
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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 || NULLRDC_802154_AUTOACK_HW
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packetbuf_set_attr(PACKETBUF_ATTR_MAC_ACK, 1);
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#endif /* NULLRDC_802154_AUTOACK || NULLRDC_802154_AUTOACK_HW */
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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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case RADIO_TX_NOACK:
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ret = MAC_TX_NOACK;
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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 || NULLRDC_802154_AUTOACK_HW
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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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