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osd-contiki/core/net/mac/xmac.c

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/*
* 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 1.13 2008/01/14 09:26:42 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"
#include "lib/random.h"
/*#include "lib/bb.h"*/
#include "contiki-conf.h"
#if CHAMELEON
#include "net/chameleon/packattr.h"
#endif
#define WITH_RECEIVER 1
#define WITH_QUEUE 0
#if !CHAMELEON
#if WITH_RECEIVER
extern
#else
static
#endif
rimeaddr_t uc_receiver;
#endif /* !CHAMELEON */
struct xmac_hdr {
rimeaddr_t sender;
rimeaddr_t receiver;
};
#ifdef XMAC_CONF_ON_TIME
#define DEFAULT_ON_TIME (XMAC_CONF_ON_TIME)
#else
#define DEFAULT_ON_TIME (RTIMER_ARCH_SECOND / 100)
#endif
#ifdef XMAC_CONF_OFF_TIME
#define DEFAULT_OFF_TIME (XMAC_CONF_OFF_TIME)
#else
#define DEFAULT_OFF_TIME ((RTIMER_ARCH_SECOND / 2) - DEFAULT_ON_TIME)
#endif
#define DEFAULT_STROBE_WAIT_TIME (DEFAULT_ON_TIME) / 2
struct xmac_config xmac_config = {
DEFAULT_ON_TIME,
DEFAULT_OFF_TIME,
DEFAULT_ON_TIME + DEFAULT_OFF_TIME,
DEFAULT_STROBE_WAIT_TIME
};
#include <stdio.h>
static struct rtimer rt;
static struct pt pt;
static int xmac_is_on = 0;
static volatile unsigned char should_be_awake = 0;
static volatile unsigned char someone_is_sending = 0;
static volatile unsigned char we_are_sending = 0;
static volatile unsigned char radio_is_on = 0;
static const struct radio_driver *radio;
#undef LEDS_ON
#undef LEDS_OFF
#undef LEDS_TOGGLE
#define BB_SET(x,y)
#define BB_INC(x,y)
/* #define BB_SET(x,y) bb_set(x,y) */
/* #define BB_INC(x,y) bb_inc(x,y) */
#define LEDS_ON(x) leds_on(x)
#define LEDS_OFF(x) leds_off(x)
#define LEDS_TOGGLE(x) leds_toggle(x)
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#undef LEDS_ON
#undef LEDS_OFF
#undef LEDS_TOGGLE
#define LEDS_ON(x)
#define LEDS_OFF(x)
#define LEDS_TOGGLE(x)
#define PRINTF(...)
#endif
static void (* receiver_callback)(const struct mac_driver *);
/*---------------------------------------------------------------------------*/
static void
set_receive_function(void (* recv)(const struct mac_driver *))
{
receiver_callback = recv;
}
/*---------------------------------------------------------------------------*/
static char
powercycle(struct rtimer *t, void *ptr)
{
int r;
/* printf("%d\n", pt.lc);*/
PT_BEGIN(&pt);
while(1) {
/* Only wait for some cycles to pass for someone to start sending */
if(someone_is_sending > 0) {
someone_is_sending--;
}
if(xmac_config.off_time > 0) {
if(should_be_awake == 0) {
if(xmac_is_on && we_are_sending == 0) {
radio->off();
LEDS_OFF(LEDS_RED);
radio_is_on = 0;
}
} else {
should_be_awake++;
if(should_be_awake > 2) {
should_be_awake = 0;
}
}
r = rtimer_set(t, RTIMER_TIME(t) + xmac_config.off_time, 1,
(void (*)(struct rtimer *, void *))powercycle, ptr);
if(r) {
PRINTF("xmac: 1 could not set rtimer %d\n", r);
}
PT_YIELD(&pt);
}
if(radio_is_on == 0) {
if(xmac_is_on && we_are_sending == 0 && should_be_awake == 0) {
radio->on();
LEDS_ON(LEDS_RED);
radio_is_on = 1;
}
}
r = rtimer_set(t, RTIMER_TIME(t) + xmac_config.on_time, 1,
(void (*)(struct rtimer *, void *))powercycle, ptr);
if(r) {
PRINTF("xmac: 2 could not set rtimer %d\n", r);
}
PT_YIELD(&pt);
}
PT_END(&pt);
}
/*---------------------------------------------------------------------------*/
static int
send_packet(void)
{
rtimer_clock_t t0;
rtimer_clock_t t;
int strobes;
struct xmac_hdr *hdr;
int got_ack = 0;
struct xmac_hdr msg;
int len;
we_are_sending = 1;
radio->on();
LEDS_ON(LEDS_RED);
radio_is_on = 1;
/* printf("xmac_send\n");*/
#if !CHAMELEON
PRINTF("xmac: send() len %d to %d.%d\n", rimebuf_totlen(),
uc_receiver.u8[0], uc_receiver.u8[1]);
#endif
rimebuf_hdralloc(sizeof(struct xmac_hdr));
hdr = rimebuf_hdrptr();
rimeaddr_copy(&hdr->sender, &rimeaddr_node_addr);
#if CHAMELEON
rimeaddr_copy(&hdr->receiver, packattr_aget(PACKATTR_RECEIVER));
#else
rimeaddr_copy(&hdr->receiver, &uc_receiver);
#endif
rimebuf_compact();
t0 = RTIMER_NOW();
strobes = 0;
BB_SET(XMAC_RECEIVER, hdr->receiver.u16[0]);
LEDS_ON(LEDS_YELLOW);
do {
if(strobes & 1) {
LEDS_OFF(LEDS_GREEN);
} else {
LEDS_ON(LEDS_GREEN);
}
t = RTIMER_NOW();
rimeaddr_copy(&msg.sender, &rimeaddr_node_addr);
#if CHAMELEON
rimeaddr_copy(&msg.receiver, packattr_aget(PACKATTR_RECEIVER));
#else
rimeaddr_copy(&msg.receiver, &uc_receiver);
#endif
/* printf("sender %d.%d receiver %d.%d node %d.%d.\n",
msg.sender.u8[0],msg.sender.u8[1],
msg.receiver.u8[0],msg.receiver.u8[1],
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);*/
radio->send((const u8_t *)&msg, sizeof(struct xmac_hdr));
while(RTIMER_CLOCK_LT(RTIMER_NOW(), t + xmac_config.strobe_wait_time)) {
PRINTF("xmac: now %u then %u wait %d\n",
RTIMER_NOW(), t, xmac_config.strobe_wait_time);
/* See if we got an ACK */
/* printf("before read\n");*/
len = radio->read((u8_t *)&msg, sizeof(struct xmac_hdr));
/* printf("after read len %d\n", len);*/
if(len > 0) {
PRINTF("xmac: len %d sender %d.%d receiver %d.%d node %d.%d.\n", len,
msg.sender.u8[0],msg.sender.u8[1],
msg.receiver.u8[0],msg.receiver.u8[1],
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
if(rimeaddr_cmp(&msg.sender, &rimeaddr_node_addr) &&
rimeaddr_cmp(&msg.receiver, &rimeaddr_node_addr)) {
/* We got an ACK from the receiver, so we can immediately send
the packet. */
got_ack = 1;
break;
} else {
/* RIMESTATS_ADD(sendingdrop);*/
}
}
}
/* PRINTF("xmac Strobe %d got_ack %d\n", strobes, got_ack);*/
++strobes;
if(got_ack) {
break;
}
} while(RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + xmac_config.strobe_time));
LEDS_OFF(LEDS_YELLOW);
radio->send(rimebuf_hdrptr(), rimebuf_totlen());
PRINTF("xmac: send (strobes=%u,len=%u,%s), done\n", strobes,
rimebuf_totlen(), got_ack ? "ack" : "no ack");
BB_SET(XMAC_STROBES, strobes);
if(got_ack) {
BB_INC(XMAC_SEND_WITH_ACK, 1);
} else {
BB_INC(XMAC_SEND_WITH_NOACK, 1);
}
/* printf("Strobe %d got_ack %d\n", strobes, got_ack);*/
we_are_sending = 0;
LEDS_OFF(LEDS_GREEN);
return 1;
}
/*---------------------------------------------------------------------------*/
static struct queuebuf *queued_packet;
static int
qsend_packet(void)
{
if(someone_is_sending) {
PRINTF("xmac: should queue packet, now just dropping %d %d %d %d.\n",
should_be_awake, someone_is_sending, we_are_sending, radio_is_on);
if(queued_packet != NULL) {
RIMESTATS_ADD(sendingdrop);
return 0;
} else {
#if WITH_QUEUE
queued_packet = queuebuf_new_from_rimebuf();
return 1;
#else
RIMESTATS_ADD(sendingdrop);
return 0;
#endif
}
} else {
PRINTF("xmac: send immediately.\n");
return send_packet();
}
}
/*---------------------------------------------------------------------------*/
static void
input_packet(const struct radio_driver *d)
{
if(receiver_callback) {
receiver_callback(&xmac_driver);
}
}
/*---------------------------------------------------------------------------*/
static int
read_packet(void)
{
struct xmac_hdr *hdr;
u8_t len;
rimebuf_clear();
PRINTF("xmac: input ");
len = radio->read(rimebuf_dataptr(), RIMEBUF_SIZE);
PRINTF("%d bytes\n", len);
if(len > 0) {
someone_is_sending = 2;
rimebuf_set_datalen(len);
hdr = rimebuf_dataptr();
rimebuf_hdrreduce(sizeof(struct xmac_hdr));
if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_node_addr)) {
should_be_awake = 1;
radio->on();
radio_is_on = 1;
PRINTF("xmac: for us\n");
/* Only send strobe ack if the packet itself is not a strobe ack
to us. */
if(!rimeaddr_cmp(&hdr->sender, &rimeaddr_node_addr) &&
rimebuf_totlen() == 0) {
/* XXX Send an ACK and wait for packet . */
PRINTF("xmac: got sender %d.%d receiver %d.%d\n",
hdr->sender.u8[0],hdr->sender.u8[1],
hdr->receiver.u8[0],hdr->receiver.u8[1]);
/* while(!radio_is_on) { printf(".");}*/
{
struct xmac_hdr msg;
rimeaddr_copy(&msg.receiver, &hdr->sender);
/* Using the same address as both sender and receiver will
flag the message as a strobe ack. */
rimeaddr_copy(&msg.sender, &hdr->sender);
PRINTF("xmac: sending sender %d.%d receiver %d.%d\n",
msg.sender.u8[0],msg.sender.u8[1],
msg.receiver.u8[0],msg.receiver.u8[1]);
radio->send((const u8_t *)&msg, sizeof(struct xmac_hdr));
}
}
} else if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_null)) {
/* Wait for the actual packet to arrive. */
should_be_awake = 1;
PRINTF("xmac: broadcast from %d.%d\n",
hdr->sender.u8[0],hdr->sender.u8[1]);
/* PRINTF("xmac: broadcast\n");*/
} else {
/* Go back to sleep. XXX should not turn on the radio again
until this packet has passed. */
radio->off();
radio_is_on = 0;
should_be_awake = 0;
/* long_off = 1;*/
/* XXX set timer to turn someone_is_sending off again and send queued packet. */
/* PRINTF("xmac: not for us\n");*/
}
if(rimebuf_totlen() > 0) {
/* We have received the final packet, so we can go back to being
asleep. */
someone_is_sending = 0;
should_be_awake = 0;
PRINTF("xmac: final packet received\n");
/* XXX should set timer to send queued packet later. */
if(queued_packet != NULL) {
queuebuf_free(queued_packet);
queued_packet = NULL;
}
return rimebuf_totlen();
}
}
return 0;
}
/*---------------------------------------------------------------------------*/
const struct mac_driver *
xmac_init(const struct radio_driver *d)
{
radio_is_on = 0;
should_be_awake = 0;
PT_INIT(&pt);
rtimer_set(&rt, RTIMER_NOW() + xmac_config.off_time, 1,
(void (*)(struct rtimer *, void *))powercycle, NULL);
xmac_is_on = 1;
radio = d;
radio->set_receive_function(input_packet);
BB_SET("xmac.state_addr", (int) &should_be_awake);
BB_SET(XMAC_RECEIVER, 0);
BB_SET(XMAC_STROBES, 0);
BB_SET(XMAC_SEND_WITH_ACK, 0);
BB_SET(XMAC_SEND_WITH_NOACK, 0);
return &xmac_driver;
}
/*---------------------------------------------------------------------------*/
static int
on(void)
{
xmac_is_on = 1;
return 1;
}
/*---------------------------------------------------------------------------*/
static int
off(void)
{
xmac_is_on = 0;
return radio->off();
}
/*---------------------------------------------------------------------------*/
const struct mac_driver xmac_driver =
{
qsend_packet,
read_packet,
set_receive_function,
on,
off
};
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