535 lines
14 KiB
C
535 lines
14 KiB
C
/*
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* Copyright (c) 2007, 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: cxmac.c,v 1.4 2009/06/22 11:14:11 nifi Exp $
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*/
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/**
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* \file
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* A simple power saving MAC protocol based on X-MAC [SenSys 2006]
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include "sys/pt.h"
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#include "net/mac/cxmac.h"
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#include "net/rime/ctimer.h"
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#include "dev/leds.h"
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#include "net/rime.h"
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#include "dev/radio.h"
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#include "contiki-conf.h"
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#ifdef CHAMELEON
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#include "net/chameleon/packattr.h"
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#endif
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#define WITH_RECEIVER 1
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#define WITH_QUEUE 0
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/* XMAC_CONF_ON_TIME and XMAC_CONF_OFF_TIME are defined with
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RTIMER_ARCH so we undef them for now. */
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#undef XMAC_CONF_ON_TIME
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#undef XMAC_CONF_OFF_TIME
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/*
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#undef XMAC_CONF_ON_TIME
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#undef XMAC_CONF_OFF_TIME
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#define XMAC_CONF_ON_TIME RTIMER_ARCH_SECOND / 100
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#define XMAC_CONF_OFF_TIME RTIMER_ARCH_SECOND / 10
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*/
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#if WITH_RECEIVER
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extern
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#else
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static
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#endif
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rimeaddr_t uc_receiver;
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struct powercycle {
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struct pt pt;
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struct ctimer ct;
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clock_time_t ontime, offtime;
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int num_strobes;
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};
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struct xmac_hdr {
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rimeaddr_t sender;
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rimeaddr_t receiver;
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};
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static struct ctimer ct;
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static struct pt pt;
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static struct ctimer ctimer;
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#ifdef XMAC_CONF_ON_TIME
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#define ON_TIME (XMAC_CONF_ON_TIME)
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#else
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#define ON_TIME (CLOCK_SECOND / 100)
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#endif
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#ifdef XMAC_CONF_OFF_TIME
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#define OFF_TIME (XMAC_CONF_OFF_TIME)
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#else
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#define OFF_TIME (ON_TIME * 10)
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#endif
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#define STROBE_WAIT_TIME (ON_TIME) / 2
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#define QUEUE_SEND_TIME 0
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static volatile unsigned char should_be_awake = 0;
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static volatile unsigned char someone_is_sending = 0;
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static volatile unsigned char we_are_sending = 0;
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static volatile unsigned char radio_is_on = 0;
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static volatile unsigned char long_off = 0;
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static volatile unsigned char should_stop = 0;
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static const struct radio_driver *radio;
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static struct queuebuf *queued_packet;
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static struct ctimer qsend_timer;
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#undef LEDS_ON
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#undef LEDS_OFF
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#undef LEDS_TOGGLE
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#include <stdio.h>
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#define DEBUG 1
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#if DEBUG
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#define LEDS_ON(x) leds_on(x)
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#define LEDS_OFF(x) leds_off(x)
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#define LEDS_TOGGLE(x) leds_toggle(x)
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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 LEDS_ON(x)
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#define LEDS_OFF(x)
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#define LEDS_TOGGLE(x)
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#define PRINTF(...)
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#endif
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static void (* receiver_callback)(const struct mac_driver *);
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/*---------------------------------------------------------------------------*/
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static void
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set_receive_function(void (* recv)(const struct mac_driver *))
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{
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receiver_callback = recv;
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}
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/*---------------------------------------------------------------------------*/
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static int powercycle(struct ctimer *t, void *ptr);
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static void
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powercycle_call(void *ptr)
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{
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powercycle(&ct, ptr);
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}
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/*---------------------------------------------------------------------------*/
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static int
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powercycle(struct ctimer *t, void *ptr)
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{
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int r;
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/* printf("powercycle\n");*/
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if(should_stop) {
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/* Do not reschedule */
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return 0;
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}
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PT_BEGIN(&pt);
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while(1) {
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static clock_time_t t1, t2;
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t1 = clock_time();
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if(should_be_awake == 0) {
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radio->off();
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radio_is_on = 0;
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LEDS_OFF(LEDS_RED);
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} else {
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should_be_awake++;
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if(should_be_awake > 2) {
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should_be_awake = 0;
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}
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}
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ctimer_set(t, OFF_TIME,
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powercycle_call, ptr);
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/* if(r) {
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PRINTF("xmac: 1 could not set rtimer %d\n", r);
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}*/
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t2 = clock_time();
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/* printf("xmac 1 %d\n", t2 - t1); */
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PT_YIELD(&pt);
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if(we_are_sending) {
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PRINTF("xmac: we are sending 1, stopping timer\n");
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PT_YIELD(&pt);
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}
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t1 = clock_time();
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if(radio_is_on == 0) {
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radio->on();
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radio_is_on = 1;
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LEDS_ON(LEDS_RED);
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}
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ctimer_set(t, ON_TIME,
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powercycle_call, ptr);
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/* if(r) {
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PRINTF("xmac: 2 could not set rtimer %d\n", r);
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}*/
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t2 = clock_time();
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/* printf("xmac 2 %d\n", t2 - t1); */
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PT_YIELD(&pt);
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if(we_are_sending) {
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PRINTF("xmac: we are sending 2, stopping timer\n");
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PT_YIELD(&pt);
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}
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if(long_off) {
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/* XXX should wait for a complete packet that is not destined to
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us to swisch past us. */
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PRINTF("xmac: long off turning on again.\n");
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radio->off();
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radio_is_on = 0;
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LEDS_OFF(LEDS_RED);
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ctimer_set(t, OFF_TIME,
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powercycle_call, ptr);
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long_off = 0;
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someone_is_sending = 0;
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}
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}
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PT_END(&pt);
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}
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/*---------------------------------------------------------------------------*/
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static int
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send(void)
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{
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clock_time_t t0, t1;
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int strobes;
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struct xmac_hdr *hdr;
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int got_ack = 0;
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we_are_sending = 1;
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should_be_awake = 1;
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radio_is_on = 1;
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radio->on();
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/* printf("xmac_send\n");*/
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#if !CHAMELEON
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PRINTF("xmac: send() len %d to %d.%d\n", packetbuf_totlen(),
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uc_receiver.u8[0], uc_receiver.u8[1]);
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#endif
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packetbuf_hdralloc(sizeof(struct xmac_hdr));
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hdr = packetbuf_hdrptr();
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rimeaddr_copy(&hdr->sender, &rimeaddr_node_addr);
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#if CHAMELEON
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rimeaddr_copy(&hdr->receiver, packattr_aget(PACKATTR_RECEIVER));
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#else
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rimeaddr_copy(&hdr->receiver, &uc_receiver);
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#endif
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packetbuf_compact();
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/* should_be_awake = 1;
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while(!radio_is_on) {}*/
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t0 = clock_time();
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strobes = 0;
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do {
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struct xmac_hdr msg;
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clock_time_t t;
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int len;
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t = clock_time();
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LEDS_TOGGLE(LEDS_GREEN);
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rimeaddr_copy(&msg.sender, &rimeaddr_node_addr);
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#if CHAMELEON
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rimeaddr_copy(&msg.receiver, packattr_aget(PACKATTR_RECEIVER));
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#else
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rimeaddr_copy(&msg.receiver, &uc_receiver);
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#endif
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/* printf("sender %d.%d receiver %d.%d node %d.%d.\n",
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msg.sender.u8[0],msg.sender.u8[1],
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msg.receiver.u8[0],msg.receiver.u8[1],
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);*/
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radio->send((const uint8_t *)&msg, sizeof(struct xmac_hdr));
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/* while(RTIMER_CLOCK_LT(RTIMER_NOW(), t + STROBE_WAIT_TIME)) {*/
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while(clock_time() < t + STROBE_WAIT_TIME) {
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/* printf("now %d then %d wait %d\n",
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RTIMER_NOW(), t, STROBE_WAIT_TIME);*/
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/* See if we got an ACK */
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/* printf("befor read\n");*/
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len = radio->read((uint8_t *)&msg, sizeof(struct xmac_hdr));
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/* printf("after read len %d\n", len);*/
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if(len > 0) {
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PRINTF("xmac len %d sender %d.%d receiver %d.%d node %d.%d.\n", len,
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msg.sender.u8[0],msg.sender.u8[1],
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msg.receiver.u8[0],msg.receiver.u8[1],
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
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if(rimeaddr_cmp(&msg.receiver, &rimeaddr_node_addr)) {
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/* We got an ACK from the receiver, so we can immediately send
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the packet. */
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got_ack = 1;
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break;
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} else {
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RIMESTATS_ADD(sendingdrop);
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}
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}
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}
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/* PRINTF("xmac Strobe %d got_ack %d\n", strobes, got_ack);*/
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++strobes;
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if(got_ack) {
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break;
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}
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} while(clock_time() < t0 + OFF_TIME + ON_TIME);
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/* } while(RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + OFF_TIME + ON_TIME * 2));*/
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radio->send(packetbuf_hdrptr(), packetbuf_totlen());
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/* printf("xmac send time %d\n", (rtimer_clock_t)(RTIMER_NOW() - t0));
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if((rtimer_clock_t)(RTIMER_NOW() - t0) > 10000) {
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printf("Too long send\n");
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abort();
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}*/
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PRINTF("xmac: send, done\n");
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/* printf("Strobe %d got_ack %d\n", strobes, got_ack);*/
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LEDS_OFF(LEDS_GREEN);
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PT_INIT(&pt);
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/* if(rtimer_set(&rt, RTIMER_NOW() + ON_TIME, 1,
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(rtimer_callback_t)powercycle, NULL)) {
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PRINTF("xmac: could not set rtimer after send\n");
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}*/
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ctimer_set(&ct, ON_TIME, powercycle_call, NULL);
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we_are_sending = 0;
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should_be_awake = 0;
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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static int
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qsend(void)
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{
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if(someone_is_sending) {
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PRINTF("xmac: should queue packet, now just dropping %d %d %d %d.\n",
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should_be_awake, someone_is_sending, we_are_sending, radio_is_on);
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if(queued_packet != NULL) {
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RIMESTATS_ADD(contentiondrop);
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return 0;
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} else {
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#if WITH_QUEUE
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queued_packet = queuebuf_new_from_packetbuf();
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return 1;
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#else
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RIMESTATS_ADD(contentiondrop);
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return 0;
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#endif
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}
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} else {
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PRINTF("xmac: send immediately.\n");
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return send();
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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send_queued(void *ptr)
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{
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queuebuf_to_packetbuf(queued_packet);
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queuebuf_free(queued_packet);
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queued_packet = NULL;
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qsend();
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}
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/*---------------------------------------------------------------------------*/
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static void
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input(const struct radio_driver *d)
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{
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if(receiver_callback) {
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should_be_awake = 1;
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receiver_callback(&cxmac_driver);
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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reset_state(void *ptr)
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{
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someone_is_sending = 0;
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should_be_awake = 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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read(void)
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{
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struct xmac_hdr *hdr;
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uint8_t len;
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packetbuf_clear();
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PRINTF("xmac: input ");
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len = radio->read(packetbuf_dataptr(), PACKETBUF_SIZE);
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PRINTF("%d bytes at %d.%d\n", len,
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rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1]);
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if(len > 0) {
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someone_is_sending = 1;
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ctimer_set(&ctimer,
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(OFF_TIME * 2),
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reset_state, NULL);
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packetbuf_set_datalen(len);
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hdr = packetbuf_dataptr();
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packetbuf_hdrreduce(sizeof(struct xmac_hdr));
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if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_node_addr)) {
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should_be_awake = 1;
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PRINTF("xmac: for us\n");
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if(!rimeaddr_cmp(&hdr->sender, &rimeaddr_node_addr) &&
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packetbuf_totlen() == 0) {
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/* XXX Send an ACK and wait for packet . */
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PRINTF("xmac: got sender %d.%d receiver %d.%d\n",
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hdr->sender.u8[0],hdr->sender.u8[1],
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hdr->receiver.u8[0],hdr->receiver.u8[1]);
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while(!radio_is_on) {}
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{
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struct xmac_hdr msg;
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rimeaddr_copy(&msg.receiver, &hdr->sender);
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rimeaddr_copy(&msg.sender, &hdr->sender);
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PRINTF("xmac: sending sender %d.%d receiver %d.%d\n",
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msg.sender.u8[0],msg.sender.u8[1],
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msg.receiver.u8[0],msg.receiver.u8[1]);
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radio->send((const uint8_t *)&msg, sizeof(struct xmac_hdr));
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}
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}
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} else if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_null)) {
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/* Wait for the actual packet to arrive. */
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should_be_awake = 1;
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PRINTF("xmac: broadcast from %d.%d\n",
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hdr->sender.u8[0],hdr->sender.u8[1]);
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/* PRINTF("xmac: broadcast\n");*/
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} else {
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/* Go back to sleep. XXX should not turn on the radio again
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until this packet has passed. */
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should_be_awake = 0;
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someone_is_sending = 1;
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long_off = 1;
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PRINTF("xmac: long off");
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/* XXX set timer to turn someone_is_sending off again and send queued packet. */
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/* PRINTF("xmac: not for us\n");*/
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}
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if(packetbuf_totlen() > 0) {
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/* We have received the final packet, so we can go back to being
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asleep. */
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someone_is_sending = 0;
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should_be_awake = 0;
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PRINTF("xmac: final packet received\n");
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#if WITH_QUEUE
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/* XXX should set timer to send queued packet later. */
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if(queued_packet != NULL) {
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ctimer_set(&qsend_timer, QUEUE_SEND_TIME, send_queued, queued_packet);
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}
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#endif
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return packetbuf_totlen();
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}
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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const struct mac_driver *
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cxmac_init(const struct radio_driver *d)
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{
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radio_is_on = 0;
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should_be_awake = 0;
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should_stop = 0;
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PT_INIT(&pt);
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/* rtimer_set(&rt, RTIMER_NOW() + OFF_TIME, 1,
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(rtimer_callback_t)powercycle, NULL);*/
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ctimer_set(&ct, OFF_TIME, powercycle_call, NULL);
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radio = d;
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radio->set_receive_function(input);
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return &cxmac_driver;
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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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should_stop = 0;
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radio_is_on = 0;
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should_be_awake = 0;
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should_stop = 0;
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PT_INIT(&pt);
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/* rtimer_set(&rt, RTIMER_NOW() + OFF_TIME, 1,
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(rtimer_callback_t)powercycle, NULL); */
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ctimer_set(&ct, OFF_TIME, powercycle_call, NULL);
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return 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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should_stop = 1;
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if(keep_radio_on) {
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return radio->on();
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} else {
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return radio->off();
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}
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}
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/*---------------------------------------------------------------------------*/
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const struct mac_driver cxmac_driver =
|
|
{
|
|
"CXMAC",
|
|
cxmac_init,
|
|
qsend,
|
|
read,
|
|
set_receive_function,
|
|
on,
|
|
off
|
|
};
|