mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-11-12 03:04:57 +00:00
212 lines
5.5 KiB
C
212 lines
5.5 KiB
C
/*
|
|
* Copyright (c) 2007, Swedish Institute of Computer Science.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* This file is part of the Contiki operating system.
|
|
*
|
|
* $Id: xmac.c,v 1.1 2007/04/07 05:43:31 adamdunkels Exp $
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* A simple power saving MAC protocol based on X-MAC [SenSys 2006]
|
|
* \author
|
|
* Adam Dunkels <adam@sics.se>
|
|
*/
|
|
|
|
#include "sys/pt.h"
|
|
#include "net/mac/xmac.h"
|
|
#include "sys/rtimer.h"
|
|
#include "dev/leds.h"
|
|
#include "net/rime.h"
|
|
#include "dev/radio.h"
|
|
|
|
struct powercycle {
|
|
struct pt pt;
|
|
struct rtimer rt;
|
|
rtimer_clock_t ontime, offtime;
|
|
int num_strobes;
|
|
};
|
|
|
|
struct xmac_hdr {
|
|
rimeaddr_t receiver;
|
|
};
|
|
|
|
static struct rtimer rt;
|
|
static struct pt pt;
|
|
|
|
#define BASE_TIME (RTIMER_ARCH_SECOND / 100)
|
|
|
|
#define OFF_TIME BASE_TIME * 10
|
|
#define ON_TIME BASE_TIME
|
|
#define STROBE_WAIT_TIME ON_TIME / 10
|
|
|
|
static volatile unsigned char should_be_awake = 0;
|
|
static volatile unsigned char radio_is_on = 0;
|
|
|
|
static int (*send_func)(const u8_t *buf, u8_t len);
|
|
|
|
#undef LEDS_ON
|
|
#undef LEDS_OFF
|
|
#undef LEDS_TOGGLE
|
|
|
|
#define DEBUG 0
|
|
#if DEBUG
|
|
#define LEDS_ON(x) leds_on(x)
|
|
#define LEDS_OFF(x) leds_off(x)
|
|
#define LEDS_TOGGLE(x) leds_toggle(x)
|
|
#else
|
|
#define LEDS_ON(x)
|
|
#define LEDS_OFF(x)
|
|
#define LEDS_TOGGLE(x)
|
|
#endif
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
powercycle(struct rtimer *t, void *ptr)
|
|
{
|
|
static int awake_periods = 0;
|
|
PT_BEGIN(&pt);
|
|
|
|
while(1) {
|
|
if(should_be_awake == 0) {
|
|
awake_periods = 0;
|
|
radio_off();
|
|
radio_is_on = 0;
|
|
LEDS_OFF(LEDS_RED);
|
|
} else {
|
|
awake_periods++;
|
|
/* if(awake_periods > 4) {
|
|
awake_periods = 0;
|
|
should_be_awake = 0;
|
|
}*/
|
|
}
|
|
rtimer_set(t, RTIMER_TIME(t) + OFF_TIME, 1, powercycle, ptr);
|
|
PT_YIELD(&pt);
|
|
|
|
if(radio_is_on == 0) {
|
|
radio_on();
|
|
radio_is_on = 1;
|
|
LEDS_ON(LEDS_RED);
|
|
}
|
|
rtimer_set(t, RTIMER_TIME(t) + ON_TIME, 1, powercycle, ptr);
|
|
PT_YIELD(&pt);
|
|
|
|
}
|
|
|
|
PT_END(&pt);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
xmac_init(void)
|
|
{
|
|
radio_is_on = 0;
|
|
should_be_awake = 0;
|
|
PT_INIT(&pt);
|
|
rtimer_set(&rt, RTIMER_NOW() + OFF_TIME, 1, powercycle, NULL);
|
|
|
|
rime_set_output(xmac_send);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
xmac_send(void)
|
|
{
|
|
rtimer_clock_t t0, t1;
|
|
int strobes;
|
|
|
|
/* printf("xmac_send\n");*/
|
|
|
|
rimebuf_hdralloc(sizeof(struct xmac_hdr));
|
|
rimebuf_compact();
|
|
|
|
should_be_awake = 1;
|
|
while(!radio_is_on);
|
|
|
|
t0 = RTIMER_NOW();
|
|
strobes = 0;
|
|
|
|
do {
|
|
struct xmac_hdr msg;
|
|
rtimer_clock_t t;
|
|
|
|
t = RTIMER_NOW();
|
|
|
|
LEDS_TOGGLE(LEDS_GREEN);
|
|
msg.receiver.u16[0] = 0;
|
|
if(send_func) {
|
|
send_func((const u8_t *)&msg, sizeof(struct xmac_hdr));
|
|
}
|
|
while(RTIMER_CLOCK_LT(RTIMER_NOW(), t + STROBE_WAIT_TIME));
|
|
|
|
/* printf("Strobe %d\n", strobes);*/
|
|
++strobes;
|
|
} while(RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + OFF_TIME + ON_TIME));
|
|
|
|
if(send_func) {
|
|
send_func(rimebuf_hdrptr(), rimebuf_totlen());
|
|
}
|
|
LEDS_OFF(LEDS_GREEN);
|
|
|
|
should_be_awake = 0;
|
|
|
|
/* printf("xmac_send after\n");*/
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
xmac_set_sendfunc(int (*f)(const u8_t *, u8_t))
|
|
{
|
|
send_func = f;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
xmac_input(void)
|
|
{
|
|
struct xmac_hdr *hdr = rimebuf_dataptr();
|
|
|
|
rimebuf_hdrreduce(sizeof(struct xmac_hdr));
|
|
if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_node_addr)) {
|
|
/* XXX Send an ACK and wait for packet . */
|
|
should_be_awake = 1;
|
|
} else if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_null)) {
|
|
/* Wait for the actual packet to arrive. */
|
|
should_be_awake = 1;
|
|
} else {
|
|
/* Go back to sleep. */
|
|
should_be_awake = 0;
|
|
}
|
|
|
|
if(rimebuf_totlen() > 0) {
|
|
|
|
/* We have received the final packet, so we can go back to being
|
|
asleep. */
|
|
|
|
should_be_awake = 0;
|
|
rime_input();
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|