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contiki/core/net/mac/contikimac.c

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/*
* Copyright (c) 2010, 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: contikimac.c,v 1.10 2010/03/09 20:37:02 adamdunkels Exp $
*/
/**
* \file
* The Contiki power-saving MAC protocol (ContikiMAC)
* \author
* Adam Dunkels <adam@sics.se>
* Niclas Finne <nfi@sics.se>
* Joakim Eriksson <joakime@sics.se>
*/
#include "net/netstack.h"
#include "dev/leds.h"
#include "dev/radio.h"
#include "dev/watchdog.h"
#include "lib/random.h"
#include "net/mac/contikimac.h"
#include "net/rime.h"
#include "sys/compower.h"
#include "sys/pt.h"
#include "sys/rtimer.h"
#include "contiki-conf.h"
#ifdef EXPERIMENT_SETUP
#include "experiment-setup.h"
#endif
#include <string.h>
#ifndef WITH_ACK_OPTIMIZATION
#define WITH_ACK_OPTIMIZATION 0
#endif
#ifndef WITH_PHASE_OPTIMIZATION
#define WITH_PHASE_OPTIMIZATION 1
#endif
#ifndef WITH_STREAMING
#define WITH_STREAMING 1
#endif
struct announcement_data {
uint16_t id;
uint16_t value;
};
/* The maximum number of announcements in a single announcement
message - may need to be increased in the future. */
#define ANNOUNCEMENT_MAX 10
/* The structure of the announcement messages. */
struct announcement_msg {
uint16_t num;
struct announcement_data data[ANNOUNCEMENT_MAX];
};
/* The length of the header of the announcement message, i.e., the
"num" field in the struct. */
#define ANNOUNCEMENT_MSG_HEADERLEN (sizeof (uint16_t))
#define DISPATCH 0
#define TYPE_ANNOUNCEMENT 0x12
#ifdef CONTIKIMAC_CONF_CYCLE_TIME
#define CYCLE_TIME (CONTIKIMAC_CONF_CYCLE_TIME)
#else
#define CYCLE_TIME (RTIMER_ARCH_SECOND / MAC_CHANNEL_CHECK_RATE)
#endif
#define CCA_COUNT_MAX 2
#define CCA_CHECK_TIME RTIMER_ARCH_SECOND / 8192
#define CCA_SLEEP_TIME RTIMER_ARCH_SECOND / 2000 + CCA_CHECK_TIME
#define CHECK_TIME (CCA_COUNT_MAX * (CCA_CHECK_TIME + CCA_SLEEP_TIME))
#define INTER_PACKET_INTERVAL RTIMER_ARCH_SECOND / 2500
#define AFTER_ACK_DETECTECT_WAIT_TIME RTIMER_ARCH_SECOND / 1500
#define LISTEN_TIME_AFTER_PACKET_DETECTED RTIMER_ARCH_SECOND / 100
#define SHORTEST_PACKET_SIZE 18
/* The cycle time for announcements. */
#define ANNOUNCEMENT_PERIOD 4 * CLOCK_SECOND
/* The time before sending an announcement within one announcement
cycle. */
#define ANNOUNCEMENT_TIME (random_rand() % (ANNOUNCEMENT_PERIOD))
#define STROBE_WAIT_TIME (RTIMER_ARCH_SECOND / 600)
#define STROBE_TIME (CYCLE_TIME + 8 * CHECK_TIME)
#define ACK_LEN 3
#include <stdio.h>
static struct rtimer rt;
static struct pt pt;
static volatile uint8_t contikimac_is_on = 0;
static volatile unsigned char we_are_sending = 0;
static volatile unsigned char radio_is_on = 0;
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#define PRINTDEBUG(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#define PRINTDEBUG(...)
#endif
#if CONTIKIMAC_CONF_ANNOUNCEMENTS
/* Timers for keeping track of when to send announcements. */
static struct ctimer announcement_cycle_ctimer, announcement_ctimer;
static int announcement_radio_txpower;
#endif /* CONTIKIMAC_CONF_ANNOUNCEMENTS */
/* Flag that is used to keep track of whether or not we are listening
for announcements from neighbors. */
static uint8_t is_listening;
#if CONTIKIMAC_CONF_COMPOWER
static struct compower_activity current_packet;
#endif /* CONTIKIMAC_CONF_COMPOWER */
#if WITH_PHASE_OPTIMIZATION
#include "net/mac/phase.h"
#define MAX_PHASE_NEIGHBORS 30
PHASE_LIST(phase_list, MAX_PHASE_NEIGHBORS);
#endif /* WITH_PHASE_OPTIMIZATION */
static uint8_t is_streaming;
static rimeaddr_t is_streaming_to, is_streaming_to_too;
static rtimer_clock_t stream_until;
#define DEFAULT_STREAM_TIME (RTIMER_ARCH_SECOND)
#ifndef MIN
#define MIN(a, b) ((a) < (b)? (a) : (b))
#endif /* MIN */
static volatile uint8_t packet_indication_flag;
static volatile uint16_t packet_indicated_but_not_received,
packet_indicated_but_not_received_clear_third_time;
volatile uint16_t
packet_indicated_but_not_received_clear_second_time;
struct cca_checks_stats {
volatile char check[CCA_COUNT_MAX];
};
#define LATEST_CCA_CHECKS_NUM 16
static volatile struct cca_checks_stats cca_checks[LATEST_CCA_CHECKS_NUM];
static volatile struct cca_checks_stats *latest_cca_check = &cca_checks[LATEST_CCA_CHECKS_NUM - 1];
/*---------------------------------------------------------------------------*/
static void
on(void)
{
if(contikimac_is_on && radio_is_on == 0) {
radio_is_on = 1;
NETSTACK_RADIO.on();
}
}
/*---------------------------------------------------------------------------*/
static void
off(void)
{
if(contikimac_is_on && radio_is_on != 0 && is_listening == 0 && is_streaming == 0) {
radio_is_on = 0;
NETSTACK_RADIO.off();
}
}
/*---------------------------------------------------------------------------*/
static char powercycle(struct rtimer *t, void *ptr);
static void
schedule_powercycle(struct rtimer *t, rtimer_clock_t time)
{
int r;
if(contikimac_is_on) {
if(RTIMER_CLOCK_LT(RTIMER_TIME(t) + time, RTIMER_NOW())) {
time = RTIMER_NOW() - RTIMER_TIME(t);
}
while(RTIMER_TIME(t) + time == RTIMER_NOW() ||
RTIMER_TIME(t) + time == RTIMER_NOW() + 1) {
++time;
}
#if NURTIMER
r = rtimer_reschedule(t, time, 1);
#else
r = rtimer_set(t, RTIMER_TIME(t) + time, 1,
(void (*)(struct rtimer *, void *))powercycle, NULL);
#endif
if(r != RTIMER_OK) {
printf("schedule_powercycle: could not set rtimer\n");
}
}
}
static void
powercycle_turn_radio_off(void)
{
if(we_are_sending == 0) {
off();
}
}
static void
powercycle_turn_radio_on(void)
{
if(we_are_sending == 0) {
on();
}
}
static char
powercycle(struct rtimer *t, void *ptr)
{
rtimer_clock_t start;
if(is_streaming) {
start = RTIMER_NOW();
#if NURTIMER
if(!RTIMER_CLOCK_LT(start, RTIMER_NOW(), stream_until))
#else
if(!RTIMER_CLOCK_LT(RTIMER_NOW(), stream_until))
#endif
{
is_streaming = 0;
rimeaddr_copy(&is_streaming_to, &rimeaddr_null);
rimeaddr_copy(&is_streaming_to_too, &rimeaddr_null);
}
}
PT_BEGIN(&pt);
while(1) {
static uint8_t packet_seen;
static rtimer_clock_t t0, cycle_start;
static uint8_t count;
static uint8_t clear_second_time, clear_third_time;
cycle_start = RTIMER_NOW();
for(count = 1; count < LATEST_CCA_CHECKS_NUM; ++count) {
cca_checks[count - 1] = cca_checks[count];
}
latest_cca_check->check[0] =
latest_cca_check->check[1] = 2;
packet_seen = 0;
clear_second_time = clear_third_time = 0;
if(we_are_sending == 0) {
latest_cca_check->check[0] =
latest_cca_check->check[1] = -1;
for(count = 0; count < CCA_COUNT_MAX; ++count) {
t0 = RTIMER_NOW();
powercycle_turn_radio_on();
#if NURTIMER
while(RTIMER_CLOCK_LT(t0, RTIMER_NOW(), t0 + CCA_CHECK_TIME));
#else
while(RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + CCA_CHECK_TIME));
#endif
if(NETSTACK_RADIO.channel_clear() == 0) {
latest_cca_check->check[count] = 0;
packet_indication_flag = 1;
packet_seen = 1;
break;
} else {
latest_cca_check->check[count] = 1;
}
powercycle_turn_radio_off();
schedule_powercycle(t, CCA_SLEEP_TIME + CCA_CHECK_TIME);
PT_YIELD(&pt);
}
#if 1
/* If there were a packet in the air, turn radio on */
if(packet_seen) {
static rtimer_clock_t start;
static uint8_t silence_periods, periods;
start = RTIMER_NOW();
periods = silence_periods = 0;
while(we_are_sending == 0 && radio_is_on &&
RTIMER_CLOCK_LT(RTIMER_NOW(), (start + LISTEN_TIME_AFTER_PACKET_DETECTED))) {
/* Check for two consecutive periods of non-activity. If we
see two such periods, we turn the radio off. Also, if a
packet has been successfully received (as indicated by
the NETSTACK_RADIO.pending_packet() function), we stop
listening. */
if(NETSTACK_RADIO.channel_clear()) {
++silence_periods;
} else {
silence_periods = 0;
}
++periods;
if(NETSTACK_RADIO.receiving_packet()) {
silence_periods = 0;
}
if(silence_periods > 5) {
latest_cca_check->check[count] = -silence_periods;
leds_on(LEDS_RED);
powercycle_turn_radio_off();
#if CONTIKIMAC_CONF_COMPOWER
compower_accumulate(&compower_idle_activity);
#endif /* CONTIKIMAC_CONF_COMPOWER */
leds_off(LEDS_RED);
break;
}
if(periods > 10 && !(NETSTACK_RADIO.receiving_packet() ||
NETSTACK_RADIO.pending_packet())) {
latest_cca_check->check[count] = periods;
leds_on(LEDS_GREEN);
powercycle_turn_radio_off();
#if CONTIKIMAC_CONF_COMPOWER
compower_accumulate(&compower_idle_activity);
#endif /* CONTIKIMAC_CONF_COMPOWER */
leds_off(LEDS_GREEN);
break;
}
if(NETSTACK_RADIO.pending_packet()) {
break;
}
schedule_powercycle(t, CCA_CHECK_TIME + CCA_SLEEP_TIME);
leds_on(LEDS_BLUE);
PT_YIELD(&pt);
leds_off(LEDS_BLUE);
}
if(radio_is_on && !(NETSTACK_RADIO.receiving_packet() &&
NETSTACK_RADIO.pending_packet())) {
latest_cca_check->check[count] = -78;
leds_on(LEDS_RED + LEDS_GREEN);
powercycle_turn_radio_off();
#if CONTIKIMAC_CONF_COMPOWER
compower_accumulate(&compower_idle_activity);
#endif /* CONTIKIMAC_CONF_COMPOWER */
leds_off(LEDS_RED + LEDS_GREEN);
}
} else {
#if CONTIKIMAC_CONF_COMPOWER
compower_accumulate(&compower_idle_activity);
#endif /* CONTIKIMAC_CONF_COMPOWER */
}
#else /* 0 */
if(packet_seen) {
schedule_powercycle(t, LISTEN_TIME);
PT_YIELD(&pt);
if(!(NETSTACK_RADIO.receiving_packet() ||
NETSTACK_RADIO.pending_packet())) {
powercycle_turn_radio_off();
#if CONTIKIMAC_CONF_COMPOWER
compower_accumulate(&compower_idle_activity);
#endif /* CONTIKIMAC_CONF_COMPOWER */
}
}
#endif /* 0 */
/* If the packet indication flag is still set, it means that
there was never a packet received by the radio. We increase
the packet_indicated_but_not_received counter. */
if(packet_indication_flag) {
packet_indicated_but_not_received += packet_indication_flag;
packet_indication_flag = 0;
}
}
if(RTIMER_NOW() - cycle_start < CYCLE_TIME) {
schedule_powercycle(t, CYCLE_TIME - (RTIMER_NOW() - cycle_start));
PT_YIELD(&pt);
}
}
PT_END(&pt);
}
/*---------------------------------------------------------------------------*/
#if CONTIKIMAC_CONF_ANNOUNCEMENTS
static int
parse_announcements(const rimeaddr_t * from)
{
/* Parse incoming announcements */
struct announcement_msg adata;
int i;
memcpy(&adata, packetbuf_dataptr(),
MIN(packetbuf_datalen(), sizeof(adata)));
/* printf("%d.%d: probe from %d.%d with %d announcements\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
from->u8[0], from->u8[1], adata->num); */
/* for(i = 0; i < packetbuf_datalen(); ++i) {
printf("%02x ", ((uint8_t *)packetbuf_dataptr())[i]);
}
printf("\n"); */
for(i = 0; i < adata.num; ++i) {
/* printf("%d.%d: announcement %d: %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
adata->data[i].id,
adata->data[i].value); */
announcement_heard(from, adata.data[i].id, adata.data[i].value);
}
return i;
}
/*---------------------------------------------------------------------------*/
static int
format_announcement(char *hdr)
{
struct announcement_msg adata;
struct announcement *a;
/* Construct the announcements */
/* adata = (struct announcement_msg *)hdr; */
adata.num = 0;
for(a = announcement_list();
a != NULL && adata.num < ANNOUNCEMENT_MAX; a = a->next) {
adata.data[adata.num].id = a->id;
adata.data[adata.num].value = a->value;
adata.num++;
}
memcpy(hdr, &adata, sizeof(struct announcement_msg));
if(adata.num > 0) {
return ANNOUNCEMENT_MSG_HEADERLEN +
sizeof(struct announcement_data) * adata.num;
} else {
return 0;
}
}
#endif /* CONTIKIMAC_CONF_ANNOUNCEMENTS */
/*---------------------------------------------------------------------------*/
static int
send_packet(mac_callback_t mac_callback, void *mac_callback_ptr)
{
rtimer_clock_t t0;
rtimer_clock_t t;
rtimer_clock_t encounter_time = 0;
int strobes;
int got_strobe_ack = 0;
int len;
int is_broadcast = 0;
int is_reliable = 0;
uint8_t collisions;
int transmit_len;
int i;
if(packetbuf_totlen() == 0) {
PRINTF("contikimac: send_packet data len 0\n");
return MAC_TX_ERR_FATAL;
}
#if WITH_PHASE_OPTIMIZATION
#if WITH_ACK_OPTIMIZATION
/* Wait until the receiver is expected to be awake */
if(packetbuf_attr(PACKETBUF_ATTR_PACKET_TYPE) !=
PACKETBUF_ATTR_PACKET_TYPE_ACK && is_streaming == 0) {
if(phase_wait(&phase_list, packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
CYCLE_TIME, 6 * CHECK_TIME,
mac_callback, mac_callback_ptr) == PHASE_DEFERRED) {
return MAC_TX_DEFERRED;
}
}
#else /* WITH_ACK_OPTIMIZATION */
if(is_streaming == 0) {
if(phase_wait(&phase_list, packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
CYCLE_TIME, 6 * CHECK_TIME,
mac_callback, mac_callback_ptr) == PHASE_DEFERRED) {
return MAC_TX_DEFERRED;
}
}
#endif /* WITH_ACK_OPTIMIZATION */
#endif /* WITH_PHASE_OPTIMIZATION */
/* Make sure that the packet is longer or equal to the shorest
packet length. */
if(packetbuf_totlen() < SHORTEST_PACKET_SIZE) {
PRINTF("contikimac: shorter than shortest (%d)\n", packetbuf_totlen());
packetbuf_set_datalen(SHORTEST_PACKET_SIZE);
}
/* Create the MAC header for the data packet. */
packetbuf_set_addr(PACKETBUF_ADDR_SENDER, &rimeaddr_node_addr);
if(rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER), &rimeaddr_null)) {
is_broadcast = 1;
PRINTDEBUG("contikimac: send broadcast\n");
} else {
#if UIP_CONF_IPV6
PRINTDEBUG("contikimac: send unicast to %02x%02x:%02x%02x:%02x%02x:%02x%02x\n",
packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[0],
packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[1],
packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[2],
packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[3],
packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[4],
packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[5],
packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[6],
packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[7]);
#else
PRINTDEBUG("contikimac: send unicast to %u.%u\n",
packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[0],
packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[1]);
#endif /* UIP_CONF_IPV6 */
}
is_reliable = packetbuf_attr(PACKETBUF_ATTR_RELIABLE) ||
packetbuf_attr(PACKETBUF_ATTR_ERELIABLE);
len = NETSTACK_FRAMER.create();
if(len == 0) {
/* Failed to send */
PRINTF("contikimac: send failed, too large header\n");
return MAC_TX_ERR_FATAL;
}
packetbuf_compact();
NETSTACK_RADIO.prepare(packetbuf_hdrptr(), packetbuf_totlen());
transmit_len = packetbuf_totlen();
#if WITH_STREAMING
if(packetbuf_attr(PACKETBUF_ATTR_PACKET_TYPE) ==
PACKETBUF_ATTR_PACKET_TYPE_STREAM) {
is_streaming = 1;
if(rimeaddr_cmp(&is_streaming_to, &rimeaddr_null)) {
rimeaddr_copy(&is_streaming_to,
packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
} else
if(!rimeaddr_cmp
(&is_streaming_to, packetbuf_addr(PACKETBUF_ADDR_RECEIVER))) {
rimeaddr_copy(&is_streaming_to_too,
packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
}
stream_until = RTIMER_NOW() + DEFAULT_STREAM_TIME;
}
#endif /* WITH_STREAMING */
/* By setting we_are_sending to one, we ensure that the rtimer
powercycle interrupt do not interfere with us sending the packet. */
we_are_sending = 1;
/* If we have a pending packet in the radio, we should not send now,
because we will trash the received packet. Instead, we signal
that we have a collision, which lets the packet be received. This
packet will be retransmitted later by the MAC protocol
instread. */
if(NETSTACK_RADIO.receiving_packet() || NETSTACK_RADIO.pending_packet()) {
we_are_sending = 0;
PRINTF("contikimac: collision receiving %d, pending %d\n",
NETSTACK_RADIO.receiving_packet(), NETSTACK_RADIO.pending_packet());
return MAC_TX_COLLISION;
}
/* Switch off the radio to ensure that we didn't start sending while
the radio was doing a channel check. */
off();
strobes = 0;
/* Send a train of strobes until the receiver answers with an ACK. */
collisions = 0;
got_strobe_ack = 0;
if(packetbuf_attr(PACKETBUF_ATTR_PACKET_TYPE) !=
PACKETBUF_ATTR_PACKET_TYPE_ACK && is_streaming == 0) {
/* Check if there are any transmissions by others. */
for(i = 0; i < CCA_COUNT_MAX; ++i) {
t0 = RTIMER_NOW();
on();
#if NURTIMER
while(RTIMER_CLOCK_LT(t0, RTIMER_NOW(), t0 + CCA_CHECK_TIME));
#else
while(RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + CCA_CHECK_TIME)) { }
#endif
if(NETSTACK_RADIO.channel_clear() == 0) {
collisions++;
off();
break;
}
off();
#if NURTIMER
while(RTIMER_CLOCK_LT(t0, RTIMER_NOW(), t0 + CCA_SLEEP_TIME + CCA_CHECK_TIME));
#else
while(RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + CCA_SLEEP_TIME + CCA_CHECK_TIME)) { }
#endif
}
}
if(collisions > 0) {
we_are_sending = 0;
off();
PRINTF("contikimac: collisions before sending\n");
return MAC_TX_COLLISION;
}
t0 = RTIMER_NOW();
t = RTIMER_NOW();
#if NURTIMER
for(strobes = 0, collisions = 0;
got_strobe_ack == 0 && collisions == 0 &&
RTIMER_CLOCK_LT(t0, RTIMER_NOW(), t0 + STROBE_TIME); strobes++) {
#else
for(strobes = 0, collisions = 0;
got_strobe_ack == 0 && collisions == 0 &&
RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + STROBE_TIME); strobes++) {
#endif
/* Let the watchdog know we are still alive. */
watchdog_periodic();
len = 0;
t = RTIMER_NOW();
/*if(is_broadcast) {
NETSTACK_RADIO.transmit(transmit_len);
off();b
} else*/ {
rtimer_clock_t wt;
rtimer_clock_t now = RTIMER_NOW();
leds_on(LEDS_RED);
NETSTACK_RADIO.transmit(transmit_len);
leds_off(LEDS_RED);
if(!is_broadcast) {
on();
}
/* Turn off the radio for a while to let the other side
respond. We don't need to keep our radio on when we know
that the other side needs some time to produce a reply. */
wt = RTIMER_NOW();
#if NURTIMER
while(RTIMER_CLOCK_LT
(wt, RTIMER_NOW(), wt + INTER_PACKET_INTERVAL));
#else
while(RTIMER_CLOCK_LT
(RTIMER_NOW(), wt + INTER_PACKET_INTERVAL)) { }
#endif
if(!is_broadcast && (NETSTACK_RADIO.receiving_packet() ||
NETSTACK_RADIO.pending_packet() ||
NETSTACK_RADIO.channel_clear() == 0)) {
uint8_t ackbuf[ACK_LEN];
wt = RTIMER_NOW();
#if NURTIMER
while(RTIMER_CLOCK_LT
(wt, RTIMER_NOW(), wt + AFTER_ACK_DETECTECT_WAIT_TIME));
#else
while(RTIMER_CLOCK_LT
(RTIMER_NOW(), wt + AFTER_ACK_DETECTECT_WAIT_TIME)) { }
#endif
len = NETSTACK_RADIO.read(ackbuf, ACK_LEN);
if(len == ACK_LEN) {
got_strobe_ack = 1;
encounter_time = now;
packet_indication_flag = 0;
} else {
PRINTF("contikimac: collisions while sending\n");
packet_indication_flag = 0;
collisions++;
}
} else {
}
}
}
#if WITH_ACK_OPTIMIZATION
/* If we have received the strobe ACK, and we are sending a packet
that will need an upper layer ACK (as signified by the
PACKETBUF_ATTR_RELIABLE packet attribute), we keep the radio on. */
if(got_strobe_ack && is_reliable) {
on(); /* Wait for ACK packet */
} else {
off();
}
#else /* WITH_ACK_OPTIMIZATION */
off();
#endif /* WITH_ACK_OPTIMIZATION */
#if WITH_PHASE_OPTIMIZATION
#if WITH_ACK_OPTIMIZATION
if(got_strobe_ack && packetbuf_attr(PACKETBUF_ATTR_PACKET_TYPE) !=
PACKETBUF_ATTR_PACKET_TYPE_ACK && is_streaming == 0) {
phase_register(&phase_list, packetbuf_addr(PACKETBUF_ADDR_RECEIVER), encounter_time);
}
#else /* WITH_ACK_OPTIMIZATION */
if(got_strobe_ack && is_streaming == 0) {
phase_register(&phase_list, packetbuf_addr(PACKETBUF_ADDR_RECEIVER), encounter_time);
}
#endif /* WITH_ACK_OPTIMIZATION */
#endif /* WITH_PHASE_OPTIMIZATION */
PRINTF("contikimac: send (strobes=%u,len=%u,%s), done\n", strobes,
packetbuf_totlen(), got_strobe_ack ? "ack" : "no ack");
#if CONTIKIMAC_CONF_COMPOWER
/* Accumulate the power consumption for the packet transmission. */
compower_accumulate(&current_packet);
/* Convert the accumulated power consumption for the transmitted
packet to packet attributes so that the higher levels can keep
track of the amount of energy spent on transmitting the
packet. */
compower_attrconv(&current_packet);
/* Clear the accumulated power consumption so that it is ready for
the next packet. */
compower_clear(&current_packet);
#endif /* CONTIKIMAC_CONF_COMPOWER */
we_are_sending = 0;
if(collisions > 0) {
return MAC_TX_COLLISION;
}
if(!is_broadcast && !got_strobe_ack) {
return MAC_TX_NOACK;
} else {
return MAC_TX_OK;
}
}
/*---------------------------------------------------------------------------*/
static void
qsend_packet(mac_callback_t sent, void *ptr)
{
int ret = send_packet(sent, ptr);
if(ret != MAC_TX_DEFERRED) {
mac_call_sent_callback(sent, ptr, ret, 1);
}
}
/*---------------------------------------------------------------------------*/
static void
input_packet(void)
{
/* We have received the packet, so we can go back to being
asleep. */
off();
packet_indication_flag = 0;
if(packetbuf_totlen() > 0 && NETSTACK_FRAMER.parse()) {
if(packetbuf_datalen() > 0 &&
packetbuf_totlen() > 0 &&
(rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
&rimeaddr_node_addr) ||
rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
&rimeaddr_null))) {
/* This is a regular packet that is destined to us or to the
broadcast address. */
#if CONTIKIMAC_CONF_COMPOWER
/* Accumulate the power consumption for the packet reception. */
compower_accumulate(&current_packet);
/* Convert the accumulated power consumption for the received
packet to packet attributes so that the higher levels can
keep track of the amount of energy spent on receiving the
packet. */
compower_attrconv(&current_packet);
/* Clear the accumulated power consumption so that it is ready
for the next packet. */
compower_clear(&current_packet);
#endif /* CONTIKIMAC_CONF_COMPOWER */
PRINTDEBUG("contikimac: data(%u)\n", packetbuf_datalen());
NETSTACK_MAC.input();
return;
} else {
PRINTDEBUG("contikimac: data not for us\n");
}
} else {
PRINTF("contikimac: failed to parse (%u)\n", packetbuf_totlen());
}
}
/*---------------------------------------------------------------------------*/
#if CONTIKIMAC_CONF_ANNOUNCEMENTS
static void
send_announcement(void *ptr)
{
struct contikimac_hdr *hdr;
int announcement_len;
/* Set up the probe header. */
packetbuf_clear();
hdr = packetbuf_dataptr();
announcement_len = format_announcement((char *)hdr +
sizeof(struct contikimac_hdr));
if(announcement_len > 0) {
packetbuf_set_datalen(sizeof(struct contikimac_hdr) + announcement_len);
hdr->dispatch = DISPATCH;
hdr->type = TYPE_ANNOUNCEMENT;
packetbuf_set_addr(PACKETBUF_ADDR_SENDER, &rimeaddr_node_addr);
packetbuf_set_addr(PACKETBUF_ADDR_RECEIVER, &rimeaddr_null);
packetbuf_set_attr(PACKETBUF_ATTR_RADIO_TXPOWER,
announcement_radio_txpower);
if(NETSTACK_FRAMER.create()) {
we_are_sending = 1;
NETSTACK_RADIO.send(packetbuf_hdrptr(), packetbuf_totlen());
we_are_sending = 0;
}
}
}
/*---------------------------------------------------------------------------*/
static void
cycle_announcement(void *ptr)
{
ctimer_set(&announcement_ctimer, ANNOUNCEMENT_TIME,
send_announcement, NULL);
ctimer_set(&announcement_cycle_ctimer, ANNOUNCEMENT_PERIOD,
cycle_announcement, NULL);
if(is_listening > 0) {
is_listening--;
/* printf("is_listening %d\n", is_listening); */
}
}
/*---------------------------------------------------------------------------*/
static void
listen_callback(int periods)
{
is_listening = periods + 1;
}
#endif /* CONTIKIMAC_CONF_ANNOUNCEMENTS */
/*---------------------------------------------------------------------------*/
void
contikimac_set_announcement_radio_txpower(int txpower)
{
#if CONTIKIMAC_CONF_ANNOUNCEMENTS
announcement_radio_txpower = txpower;
#endif /* CONTIKIMAC_CONF_ANNOUNCEMENTS */
}
/*---------------------------------------------------------------------------*/
static void
init(void)
{
radio_is_on = 0;
PT_INIT(&pt);
#if NURTIMER
rtimer_setup(&rt, RTIMER_HARD,
(void (*)(struct rtimer *, void *, int status))powercycle,
NULL);
rtimer_schedule(&rt, CYCLE_TIME, 1);
#else
rtimer_set(&rt, RTIMER_NOW() + CYCLE_TIME, 1,
(void (*)(struct rtimer *, void *))powercycle, NULL);
#endif
contikimac_is_on = 1;
#if WITH_PHASE_OPTIMIZATION
phase_init(&phase_list);
#endif /* WITH_PHASE_OPTIMIZATION */
#if CONTIKIMAC_CONF_ANNOUNCEMENTS
announcement_register_listen_callback(listen_callback);
ctimer_set(&announcement_cycle_ctimer, ANNOUNCEMENT_TIME,
cycle_announcement, NULL);
#endif /* CONTIKIMAC_CONF_ANNOUNCEMENTS */
}
/*---------------------------------------------------------------------------*/
static int
turn_on(void)
{
contikimac_is_on = 1;
#if NURTIMER
rtimer_schedule(&rt, CYCLE_TIME, 1);
#else
rtimer_set(&rt, RTIMER_NOW() + CYCLE_TIME, 1,
(void (*)(struct rtimer *, void *))powercycle, NULL);
#endif
return 1;
}
/*---------------------------------------------------------------------------*/
static int
turn_off(int keep_radio_on)
{
contikimac_is_on = 0;
if(keep_radio_on) {
return NETSTACK_RADIO.on();
} else {
return NETSTACK_RADIO.off();
}
}
/*---------------------------------------------------------------------------*/
static unsigned short
duty_cycle(void)
{
return (1ul * CLOCK_SECOND * CYCLE_TIME) / RTIMER_ARCH_SECOND;
}
/*---------------------------------------------------------------------------*/
const struct rdc_driver contikimac_driver = {
"ContikiMAC",
init,
qsend_packet,
input_packet,
turn_on,
turn_off,
duty_cycle,
};
/*---------------------------------------------------------------------------*/
uint16_t
contikimac_debug_print(void)
{
int i;
for(i = 0; i < LATEST_CCA_CHECKS_NUM; ++i) {
printf("%d: %d, %d\n", i, cca_checks[i].check[0], cca_checks[i].check[1]);
}
return 0;
}
/*---------------------------------------------------------------------------*/
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