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Power saving MAC protocol based on X-MAC [SenSys 2006]
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adamdunkels
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core/net/mac/xmac.c
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211
core/net/mac/xmac.c
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/*
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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: xmac.c,v 1.1 2007/04/07 05:43:31 adamdunkels 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/xmac.h"
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#include "sys/rtimer.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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struct powercycle {
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struct pt pt;
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struct rtimer rt;
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rtimer_clock_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 receiver;
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};
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static struct rtimer rt;
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static struct pt pt;
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#define BASE_TIME (RTIMER_ARCH_SECOND / 100)
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#define OFF_TIME BASE_TIME * 10
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#define ON_TIME BASE_TIME
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#define STROBE_WAIT_TIME ON_TIME / 10
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static volatile unsigned char should_be_awake = 0;
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static volatile unsigned char radio_is_on = 0;
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static int (*send_func)(const u8_t *buf, u8_t len);
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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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#define DEBUG 0
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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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#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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#endif
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/*---------------------------------------------------------------------------*/
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static void
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powercycle(struct rtimer *t, void *ptr)
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{
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static int awake_periods = 0;
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PT_BEGIN(&pt);
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while(1) {
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if(should_be_awake == 0) {
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awake_periods = 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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awake_periods++;
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/* if(awake_periods > 4) {
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awake_periods = 0;
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should_be_awake = 0;
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}*/
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}
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rtimer_set(t, RTIMER_TIME(t) + OFF_TIME, 1, powercycle, ptr);
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PT_YIELD(&pt);
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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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rtimer_set(t, RTIMER_TIME(t) + ON_TIME, 1, powercycle, ptr);
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PT_YIELD(&pt);
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}
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PT_END(&pt);
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}
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/*---------------------------------------------------------------------------*/
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void
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xmac_init(void)
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{
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radio_is_on = 0;
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should_be_awake = 0;
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PT_INIT(&pt);
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rtimer_set(&rt, RTIMER_NOW() + OFF_TIME, 1, powercycle, NULL);
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rime_set_output(xmac_send);
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}
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/*---------------------------------------------------------------------------*/
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void
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xmac_send(void)
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{
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rtimer_clock_t t0, t1;
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int strobes;
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/* printf("xmac_send\n");*/
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rimebuf_hdralloc(sizeof(struct xmac_hdr));
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rimebuf_compact();
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should_be_awake = 1;
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while(!radio_is_on);
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t0 = RTIMER_NOW();
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strobes = 0;
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do {
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struct xmac_hdr msg;
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rtimer_clock_t t;
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t = RTIMER_NOW();
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LEDS_TOGGLE(LEDS_GREEN);
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msg.receiver.u16[0] = 0;
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if(send_func) {
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send_func((const u8_t *)&msg, sizeof(struct xmac_hdr));
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}
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while(RTIMER_CLOCK_LT(RTIMER_NOW(), t + STROBE_WAIT_TIME));
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/* printf("Strobe %d\n", strobes);*/
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++strobes;
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} while(RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + OFF_TIME + ON_TIME));
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if(send_func) {
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send_func(rimebuf_hdrptr(), rimebuf_totlen());
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}
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LEDS_OFF(LEDS_GREEN);
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should_be_awake = 0;
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/* printf("xmac_send after\n");*/
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}
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/*---------------------------------------------------------------------------*/
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void
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xmac_set_sendfunc(int (*f)(const u8_t *, u8_t))
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{
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send_func = f;
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}
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/*---------------------------------------------------------------------------*/
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void
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xmac_input(void)
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{
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struct xmac_hdr *hdr = rimebuf_dataptr();
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rimebuf_hdrreduce(sizeof(struct xmac_hdr));
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if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_node_addr)) {
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/* XXX Send an ACK and wait for packet . */
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should_be_awake = 1;
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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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} else {
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/* Go back to sleep. */
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should_be_awake = 0;
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}
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if(rimebuf_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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should_be_awake = 0;
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rime_input();
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}
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}
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/*---------------------------------------------------------------------------*/
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54
core/net/mac/xmac.h
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54
core/net/mac/xmac.h
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@ -0,0 +1,54 @@
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/*
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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: xmac.h,v 1.1 2007/04/07 05:43:31 adamdunkels 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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#ifndef __XMAC_H__
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#define __XMAC_H__
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#include "contiki-net.h"
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void xmac_init(void);
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void xmac_send(void);
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void xmac_set_sendfunc(int (*f)(const u8_t *, u8_t));
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void xmac_input(void);
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#endif /* __XMAC_H__ */
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