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nes-proj/core/net/mac/contikimac.c

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ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
/*
A work-in-progress rework of the Contiki MAC and radio layers. The main ideas are: * Separates the Contiki low-layer network stack into four layers: network (e.g. sicslowpan / rime), Medium Access Control MAC (e.g. CSMA), Radio Duty Cycling RDC (e.g. ContikiMAC, X-MAC), and radio (e.g. cc2420). * Introduces a new way to configure the network stack. Four #defines that specify what mechanism/protocol/driver to use at the four layers: NETSTACK_CONF_NETWORK, NETSTACK_CONF_MAC, NETSTACK_CONF_RDC, NETSTACK_CONF_RADIO. * Adds a callback mechanism to inform the MAC and network layers about the fate of a transmitted packet: if the packet was not possible to transmit, the cause of the failure is reported, and if the packets was successfully transmitted, the number of tries before it was finally transmitted is reported. * NULL-protocols at both the MAC and RDC layers: nullmac and nullrdc, which can be used when MAC and RDC functionality is not needed. * Extends the radio API with three new functions that enable more efficient radio duty cycling protocols: channel check, pending packet, and receiving packet. * New initialization mechanism, which takes advantage of the NETSTACK #defines.
2010-02-18 21:48:39 +00:00
* Copyright (c) 2010, Swedish Institute of Computer Science.
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
* 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.
*
Bugfix: the return value sometimes was wrong when a collision was detected.
2010-10-03 20:39:24 +00:00
* $Id: contikimac.c,v 1.38 2010/10/03 20:39:24 adamdunkels Exp $
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
*/
/**
* \file
A work-in-progress rework of the Contiki MAC and radio layers. The main ideas are: * Separates the Contiki low-layer network stack into four layers: network (e.g. sicslowpan / rime), Medium Access Control MAC (e.g. CSMA), Radio Duty Cycling RDC (e.g. ContikiMAC, X-MAC), and radio (e.g. cc2420). * Introduces a new way to configure the network stack. Four #defines that specify what mechanism/protocol/driver to use at the four layers: NETSTACK_CONF_NETWORK, NETSTACK_CONF_MAC, NETSTACK_CONF_RDC, NETSTACK_CONF_RADIO. * Adds a callback mechanism to inform the MAC and network layers about the fate of a transmitted packet: if the packet was not possible to transmit, the cause of the failure is reported, and if the packets was successfully transmitted, the number of tries before it was finally transmitted is reported. * NULL-protocols at both the MAC and RDC layers: nullmac and nullrdc, which can be used when MAC and RDC functionality is not needed. * Extends the radio API with three new functions that enable more efficient radio duty cycling protocols: channel check, pending packet, and receiving packet. * New initialization mechanism, which takes advantage of the NETSTACK #defines.
2010-02-18 21:48:39 +00:00
* The Contiki power-saving MAC protocol (ContikiMAC)
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
* \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"
Removed non-existant cooja-debug.h include
2010-04-04 12:31:47 +00:00
/*#include "cooja-debug.h"*/
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#include "contiki-conf.h"
#ifdef EXPERIMENT_SETUP
#include "experiment-setup.h"
#endif
#include <string.h>
#ifndef WITH_ACK_OPTIMIZATION
Extend the length of announcement packets if they are too short
2010-03-19 13:24:58 +00:00
#define WITH_ACK_OPTIMIZATION 0
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#endif
#ifndef WITH_PHASE_OPTIMIZATION
#define WITH_PHASE_OPTIMIZATION 1
#endif
#ifndef WITH_STREAMING
#define WITH_STREAMING 1
#endif
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
#ifndef WITH_CONTIKIMAC_HEADER
#define WITH_CONTIKIMAC_HEADER 1
#endif
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
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
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
#if WITH_CONTIKIMAC_HEADER
#define CONTIKIMAC_ID 0x00
struct hdr {
uint8_t id;
uint8_t len;
};
#endif /* WITH_CONTIKIMAC_HEADER */
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
/* The structure of the announcement messages. */
struct announcement_msg {
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
uint8_t announcement_magic[2];
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
uint16_t num;
struct announcement_data data[ANNOUNCEMENT_MAX];
};
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
#define ANNOUNCEMENT_MAGIC1 0xAD
#define ANNOUNCEMENT_MAGIC2 0xAD
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
/* The length of the header of the announcement message, i.e., the
"num" field in the struct. */
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
#define ANNOUNCEMENT_MSG_HEADERLEN (sizeof(uint16_t) * 2)
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#ifdef CONTIKIMAC_CONF_CYCLE_TIME
#define CYCLE_TIME (CONTIKIMAC_CONF_CYCLE_TIME)
#else
Bugfix: the return value sometimes was wrong when a collision was detected.
2010-10-03 20:39:24 +00:00
#define CYCLE_TIME (RTIMER_ARCH_SECOND / NETSTACK_RDC_CHANNEL_CHECK_RATE)
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#endif
Fine-tuned the timing and phase lock optimization
2010-03-31 20:27:15 +00:00
#define MAX_PHASE_STROBE_TIME RTIMER_ARCH_SECOND / 20
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
Added a packetbuf flag that indicates if the link layer acks should be used or not
2010-04-30 07:25:51 +00:00
#define CCA_COUNT_MAX 2
#define CCA_CHECK_TIME RTIMER_ARCH_SECOND / 8192
#define CCA_SLEEP_TIME RTIMER_ARCH_SECOND / 2000
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
#define CHECK_TIME (CCA_COUNT_MAX * (CCA_CHECK_TIME + CCA_SLEEP_TIME))
Fine-tuned the timing and phase lock optimization
2010-03-31 20:27:15 +00:00
#define STROBE_TIME (CYCLE_TIME + 2 * CHECK_TIME)
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
#define STREAM_CCA_COUNT (CYCLE_TIME / (CCA_SLEEP_TIME + CCA_CHECK_TIME) - CCA_COUNT_MAX)
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
Small timing tweaks
2010-04-04 21:01:24 +00:00
#define GUARD_TIME 7 * CHECK_TIME
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
Had previously not included the waiting time that the CC2420 introduces when sending a packet. Also increased the smallest packet size, just to be on the safe side.
2010-03-30 23:01:32 +00:00
#define INTER_PACKET_INTERVAL RTIMER_ARCH_SECOND / 5000
Rework of the timing conditions of ContikiMAC: the old timing did not work well on real hardware, the new one seems to work better
2010-03-09 13:19:05 +00:00
#define AFTER_ACK_DETECTECT_WAIT_TIME RTIMER_ARCH_SECOND / 1500
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
After a lot of tweaking and twiddling with the timing of the ContikiMAC code and the mechanisms in the CC2420 driver, things seem to work somewhat stable now - knock on wood!
2010-04-04 07:49:30 +00:00
#define LISTEN_TIME_AFTER_PACKET_DETECTED RTIMER_ARCH_SECOND / 80
Rework of the timing conditions of ContikiMAC: the old timing did not work well on real hardware, the new one seems to work better
2010-03-09 13:19:05 +00:00
Improved phase lock behaviour when neighbor is not duty cycling: senders notify receivers via the 802.15.4 pending bit that they are not duty cycling. Neighbors then will start sending packets immediately and not wait for neighbors' phase. Tweaking of ContikiMAC timers to make it more reliable.
2010-04-03 13:28:30 +00:00
#define SHORTEST_PACKET_SIZE 43
Had previously not included the waiting time that the CC2420 introduces when sending a packet. Also increased the smallest packet size, just to be on the safe side.
2010-03-30 23:01:32 +00:00
#define MAX_SILENCE_PERIODS 5
After a lot of tweaking and twiddling with the timing of the ContikiMAC code and the mechanisms in the CC2420 driver, things seem to work somewhat stable now - knock on wood!
2010-04-04 07:49:30 +00:00
#define MAX_NONACTIVITY_PERIODIC 10
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
/* The cycle time for announcements. */
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
#ifdef ANNOUNCEMENT_CONF_PERIOD
#define ANNOUNCEMENT_PERIOD ANNOUNCEMENT_CONF_PERIOD
#else /* ANNOUNCEMENT_CONF_PERIOD */
#define ANNOUNCEMENT_PERIOD 1 * CLOCK_SECOND
#endif /* ANNOUNCEMENT_CONF_PERIOD */
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
/* The time before sending an announcement within one announcement
cycle. */
#define ANNOUNCEMENT_TIME (random_rand() % (ANNOUNCEMENT_PERIOD))
#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
Fixed to only use leds when DEBUG is set
2010-04-20 11:41:16 +00:00
#define DEBUG_LEDS DEBUG
#undef LEDS_ON
#undef LEDS_OFF
#if DEBUG_LEDS
#define LEDS_ON(x) leds_on(x)
#define LEDS_OFF(x) leds_off(x)
#else
#define LEDS_ON(x)
#define LEDS_OFF(x)
#endif
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#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 */
Bugfixed stream mode: node listens 100% for 0.5 seconds in stream mode. Naming change: is_listening changed is_snooping.
2010-04-01 10:02:04 +00:00
/* Flag that is used to keep track of whether or not we are snooping
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
for announcements from neighbors. */
Bugfixed stream mode: node listens 100% for 0.5 seconds in stream mode. Naming change: is_listening changed is_snooping.
2010-04-01 10:02:04 +00:00
static volatile uint8_t is_snooping;
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#if CONTIKIMAC_CONF_COMPOWER
static struct compower_activity current_packet;
#endif /* CONTIKIMAC_CONF_COMPOWER */
#if WITH_PHASE_OPTIMIZATION
#include "net/mac/phase.h"
made number of phase neighbors configurable
2010-04-01 17:17:36 +00:00
#ifndef MAX_PHASE_NEIGHBORS
Rework of the timing conditions of ContikiMAC: the old timing did not work well on real hardware, the new one seems to work better
2010-03-09 13:19:05 +00:00
#define MAX_PHASE_NEIGHBORS 30
made number of phase neighbors configurable
2010-04-01 17:17:36 +00:00
#endif
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
PHASE_LIST(phase_list, MAX_PHASE_NEIGHBORS);
#endif /* WITH_PHASE_OPTIMIZATION */
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
static volatile uint8_t is_streaming;
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
static rimeaddr_t is_streaming_to, is_streaming_to_too;
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
static volatile rtimer_clock_t stream_until;
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
Improved phase lock behaviour when neighbor is not duty cycling: senders notify receivers via the 802.15.4 pending bit that they are not duty cycling. Neighbors then will start sending packets immediately and not wait for neighbors' phase. Tweaking of ContikiMAC timers to make it more reliable.
2010-04-03 13:28:30 +00:00
#define DEFAULT_STREAM_TIME (1 * CYCLE_TIME)
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#ifndef MIN
#define MIN(a, b) ((a) < (b)? (a) : (b))
#endif /* MIN */
Improved handling of duplicate packets
2010-04-08 09:32:56 +00:00
struct seqno {
rimeaddr_t sender;
uint8_t seqno;
};
#define MAX_SEQNOS 8
static struct seqno received_seqnos[MAX_SEQNOS];
Rework of the timing conditions of ContikiMAC: the old timing did not work well on real hardware, the new one seems to work better
2010-03-09 13:19:05 +00:00
Added an optional rate limit for broadcast transmissions
2010-04-06 11:57:43 +00:00
#if CONTIKIMAC_CONF_BROADCAST_RATE_LIMIT
static struct timer broadcast_rate_timer;
static int broadcast_rate_counter;
#endif /* CONTIKIMAC_CONF_BROADCAST_RATE_LIMIT */
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
/*---------------------------------------------------------------------------*/
static void
on(void)
{
if(contikimac_is_on && radio_is_on == 0) {
radio_is_on = 1;
NETSTACK_RADIO.on();
}
}
/*---------------------------------------------------------------------------*/
static void
off(void)
{
After a lot of tweaking and twiddling with the timing of the ContikiMAC code and the mechanisms in the CC2420 driver, things seem to work somewhat stable now - knock on wood!
2010-04-04 07:49:30 +00:00
if(contikimac_is_on && radio_is_on != 0 && is_streaming == 0/* && is_snooping == 0*/) {
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
radio_is_on = 0;
NETSTACK_RADIO.off();
}
}
/*---------------------------------------------------------------------------*/
Fiddled more with the timing: the phase seems stable now at least. Still bugs left though...
2010-04-04 12:28:29 +00:00
static volatile rtimer_clock_t cycle_start;
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
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) {
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
Small timing tweaks
2010-04-04 21:01:24 +00:00
if(RTIMER_CLOCK_LT(RTIMER_TIME(t) + time, RTIMER_NOW() + 2)) {
time = RTIMER_NOW() - RTIMER_TIME(t) + 2;
Improved detection of link-layer ACKs; increased the time ContikiMAC waits when it has detected a link-layer ACK; increased the number of silence periods required to detect a CCA false positive
2010-02-28 08:33:21 +00:00
}
Fiddled more with the timing: the phase seems stable now at least. Still bugs left though...
2010-04-04 12:28:29 +00:00
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#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
Fiddled more with the timing: the phase seems stable now at least. Still bugs left though...
2010-04-04 12:28:29 +00:00
schedule_powercycle_fixed(struct rtimer *t, rtimer_clock_t fixed_time)
{
int r;
if(contikimac_is_on) {
if(RTIMER_CLOCK_LT(fixed_time, RTIMER_NOW() + 1)) {
fixed_time = RTIMER_NOW() + 1;
}
#if NURTIMER
r = rtimer_reschedule(t, RTIMER_TIME(t) - time, 1);
#else
r = rtimer_set(t, fixed_time, 1,
(void (*)(struct rtimer *, void *))powercycle, NULL);
#endif
if(r != RTIMER_OK) {
printf("schedule_powercycle: could not set rtimer\n");
}
}
}
static void
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
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)
{
PT_BEGIN(&pt);
while(1) {
static uint8_t packet_seen;
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
static rtimer_clock_t t0;
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
static uint8_t count;
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
cycle_start = RTIMER_NOW();
Fiddled more with the timing: the phase seems stable now at least. Still bugs left though...
2010-04-04 12:28:29 +00:00
if(WITH_STREAMING && is_streaming) {
#if NURTIMER
if(!RTIMER_CLOCK_LT(cycle_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);
}
}
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
packet_seen = 0;
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
do {
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
for(count = 0; count < CCA_COUNT_MAX; ++count) {
t0 = RTIMER_NOW();
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
if(we_are_sending == 0) {
powercycle_turn_radio_on();
After a lot of tweaking and twiddling with the timing of the ContikiMAC code and the mechanisms in the CC2420 driver, things seem to work somewhat stable now - knock on wood!
2010-04-04 07:49:30 +00:00
#if 0
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#if NURTIMER
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
while(RTIMER_CLOCK_LT(t0, RTIMER_NOW(), t0 + CCA_CHECK_TIME));
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#else
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
while(RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + CCA_CHECK_TIME));
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#endif
Increase the required non-activity periods before turning off the radio; remove the strict phase requirement (which messes up things with low-power streaming)
2010-03-17 16:35:52 +00:00
#endif /* 0 */
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
/* Check if a packet is seen in the air. If so, we keep the
radio on for a while (LISTEN_TIME_AFTER_PACKET_DETECTED) to
be able to receive the packet. We also continuously check
the radio medium to make sure that we wasn't woken up by a
false positive: a spurious radio interference that was not
caused by an incoming packet. */
if(NETSTACK_RADIO.channel_clear() == 0) {
packet_seen = 1;
break;
}
powercycle_turn_radio_off();
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
}
Bugfix: timing fixed
2010-04-08 18:23:24 +00:00
schedule_powercycle_fixed(t, RTIMER_NOW() + CCA_SLEEP_TIME);
Small timing tweaks
2010-04-04 21:01:24 +00:00
/* COOJA_DEBUG_STR("yield\n");*/
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
PT_YIELD(&pt);
}
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
if(packet_seen) {
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
static rtimer_clock_t start;
static uint8_t silence_periods, periods;
start = RTIMER_NOW();
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
periods = silence_periods = 0;
while(we_are_sending == 0 && radio_is_on &&
Rework of the timing conditions of ContikiMAC: the old timing did not work well on real hardware, the new one seems to work better
2010-03-09 13:19:05 +00:00
RTIMER_CLOCK_LT(RTIMER_NOW(), (start + LISTEN_TIME_AFTER_PACKET_DETECTED))) {
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
/* Check for a number of 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
Bugfixed stream mode: node listens 100% for 0.5 seconds in stream mode. Naming change: is_listening changed is_snooping.
2010-04-01 10:02:04 +00:00
snooping. */
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
if(NETSTACK_RADIO.channel_clear()) {
++silence_periods;
} else {
silence_periods = 0;
}
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
++periods;
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
if(NETSTACK_RADIO.receiving_packet()) {
silence_periods = 0;
}
Had previously not included the waiting time that the CC2420 introduces when sending a packet. Also increased the smallest packet size, just to be on the safe side.
2010-03-30 23:01:32 +00:00
if(silence_periods > MAX_SILENCE_PERIODS) {
Fixed to only use leds when DEBUG is set
2010-04-20 11:41:16 +00:00
LEDS_ON(LEDS_RED);
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
powercycle_turn_radio_off();
#if CONTIKIMAC_CONF_COMPOWER
compower_accumulate(&compower_idle_activity);
#endif /* CONTIKIMAC_CONF_COMPOWER */
Fixed to only use leds when DEBUG is set
2010-04-20 11:41:16 +00:00
LEDS_OFF(LEDS_RED);
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
break;
}
Improved phase lock behaviour when neighbor is not duty cycling: senders notify receivers via the 802.15.4 pending bit that they are not duty cycling. Neighbors then will start sending packets immediately and not wait for neighbors' phase. Tweaking of ContikiMAC timers to make it more reliable.
2010-04-03 13:28:30 +00:00
#if 1
if(periods > MAX_NONACTIVITY_PERIODIC && !(NETSTACK_RADIO.receiving_packet() ||
NETSTACK_RADIO.pending_packet())) {
Fixed to only use leds when DEBUG is set
2010-04-20 11:41:16 +00:00
LEDS_ON(LEDS_GREEN);
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
powercycle_turn_radio_off();
#if CONTIKIMAC_CONF_COMPOWER
compower_accumulate(&compower_idle_activity);
#endif /* CONTIKIMAC_CONF_COMPOWER */
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
Fixed to only use leds when DEBUG is set
2010-04-20 11:41:16 +00:00
LEDS_OFF(LEDS_GREEN);
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
break;
}
Improved phase lock behaviour when neighbor is not duty cycling: senders notify receivers via the 802.15.4 pending bit that they are not duty cycling. Neighbors then will start sending packets immediately and not wait for neighbors' phase. Tweaking of ContikiMAC timers to make it more reliable.
2010-04-03 13:28:30 +00:00
#endif /* 0 */
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
if(NETSTACK_RADIO.pending_packet()) {
break;
}
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
schedule_powercycle(t, CCA_CHECK_TIME + CCA_SLEEP_TIME);
Fixed to only use leds when DEBUG is set
2010-04-20 11:41:16 +00:00
LEDS_ON(LEDS_BLUE);
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
PT_YIELD(&pt);
Fixed to only use leds when DEBUG is set
2010-04-20 11:41:16 +00:00
LEDS_OFF(LEDS_BLUE);
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
}
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
if(radio_is_on && !(NETSTACK_RADIO.receiving_packet() ||
Rework of the timing conditions of ContikiMAC: the old timing did not work well on real hardware, the new one seems to work better
2010-03-09 13:19:05 +00:00
NETSTACK_RADIO.pending_packet())) {
Fixed to only use leds when DEBUG is set
2010-04-20 11:41:16 +00:00
LEDS_ON(LEDS_RED + LEDS_GREEN);
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
powercycle_turn_radio_off();
#if CONTIKIMAC_CONF_COMPOWER
compower_accumulate(&compower_idle_activity);
#endif /* CONTIKIMAC_CONF_COMPOWER */
Fixed to only use leds when DEBUG is set
2010-04-20 11:41:16 +00:00
LEDS_OFF(LEDS_RED + LEDS_GREEN);
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
}
} else {
#if CONTIKIMAC_CONF_COMPOWER
compower_accumulate(&compower_idle_activity);
#endif /* CONTIKIMAC_CONF_COMPOWER */
}
After a lot of tweaking and twiddling with the timing of the ContikiMAC code and the mechanisms in the CC2420 driver, things seem to work somewhat stable now - knock on wood!
2010-04-04 07:49:30 +00:00
} while(is_snooping &&
RTIMER_CLOCK_LT(RTIMER_NOW() - cycle_start, CYCLE_TIME - CHECK_TIME));
Improved phase lock behaviour when neighbor is not duty cycling: senders notify receivers via the 802.15.4 pending bit that they are not duty cycling. Neighbors then will start sending packets immediately and not wait for neighbors' phase. Tweaking of ContikiMAC timers to make it more reliable.
2010-04-03 13:28:30 +00:00
if(is_snooping) {
Fixed to only use leds when DEBUG is set
2010-04-20 11:41:16 +00:00
LEDS_ON(LEDS_RED);
Improved phase lock behaviour when neighbor is not duty cycling: senders notify receivers via the 802.15.4 pending bit that they are not duty cycling. Neighbors then will start sending packets immediately and not wait for neighbors' phase. Tweaking of ContikiMAC timers to make it more reliable.
2010-04-03 13:28:30 +00:00
}
After a lot of tweaking and twiddling with the timing of the ContikiMAC code and the mechanisms in the CC2420 driver, things seem to work somewhat stable now - knock on wood!
2010-04-04 07:49:30 +00:00
if(RTIMER_CLOCK_LT(RTIMER_NOW() - cycle_start, CYCLE_TIME)) {
Fiddled more with the timing: the phase seems stable now at least. Still bugs left though...
2010-04-04 12:28:29 +00:00
/* schedule_powercycle(t, CYCLE_TIME - (RTIMER_NOW() - cycle_start));*/
schedule_powercycle_fixed(t, CYCLE_TIME + cycle_start);
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
/* printf("cycle_start 0x%02x now 0x%02x wait 0x%02x\n",
cycle_start, RTIMER_NOW(), CYCLE_TIME - (RTIMER_NOW() - cycle_start));*/
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
PT_YIELD(&pt);
}
Fixed to only use leds when DEBUG is set
2010-04-20 11:41:16 +00:00
LEDS_OFF(LEDS_RED);
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
}
PT_END(&pt);
}
/*---------------------------------------------------------------------------*/
#if CONTIKIMAC_CONF_ANNOUNCEMENTS
static int
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
parse_announcements(void)
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
{
/* Parse incoming announcements */
struct announcement_msg adata;
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
const rimeaddr_t *from;
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
int i;
memcpy(&adata, packetbuf_dataptr(),
MIN(packetbuf_datalen(), sizeof(adata)));
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
from = packetbuf_addr(PACKETBUF_ADDR_SENDER);
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
/* printf("%d.%d: probe from %d.%d with %d announcements\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
from->u8[0], from->u8[1], adata.num); */
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
/* for(i = 0; i < packetbuf_datalen(); ++i) {
printf("%02x ", ((uint8_t *)packetbuf_dataptr())[i]);
}
printf("\n"); */
Fine-tuned the timing and phase lock optimization
2010-03-31 20:27:15 +00:00
if(adata.num / sizeof(struct announcement_data) > sizeof(struct announcement_msg)) {
/* Sanity check. The number of announcements is too large -
corrupt packet has been received. */
return 0;
}
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
for(i = 0; i < adata.num; ++i) {
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
/* printf("%d.%d: announcement %d: %d\n",
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
adata.data[i].id,
adata.data[i].value); */
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
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; */
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
adata.announcement_magic[0] = ANNOUNCEMENT_MAGIC1;
adata.announcement_magic[1] = ANNOUNCEMENT_MAGIC2;
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
adata.num = 0;
for(a = announcement_list();
Improved phase lock behaviour when neighbor is not duty cycling: senders notify receivers via the 802.15.4 pending bit that they are not duty cycling. Neighbors then will start sending packets immediately and not wait for neighbors' phase. Tweaking of ContikiMAC timers to make it more reliable.
2010-04-03 13:28:30 +00:00
a != NULL && adata.num < ANNOUNCEMENT_MAX;
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
a = a->next) {
Improved phase lock behaviour when neighbor is not duty cycling: senders notify receivers via the 802.15.4 pending bit that they are not duty cycling. Neighbors then will start sending packets immediately and not wait for neighbors' phase. Tweaking of ContikiMAC timers to make it more reliable.
2010-04-03 13:28:30 +00:00
if(a->has_value) {
adata.data[adata.num].id = a->id;
adata.data[adata.num].value = a->value;
adata.num++;
}
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
}
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
Added an optional rate limit for broadcast transmissions
2010-04-06 11:57:43 +00:00
broadcast_rate_drop(void)
{
#if CONTIKIMAC_CONF_BROADCAST_RATE_LIMIT
if(!timer_expired(&broadcast_rate_timer)) {
broadcast_rate_counter++;
if(broadcast_rate_counter < CONTIKIMAC_CONF_BROADCAST_RATE_LIMIT) {
return 0;
} else {
return 1;
}
} else {
timer_set(&broadcast_rate_timer, CLOCK_SECOND);
broadcast_rate_counter = 0;
return 0;
}
#else /* CONTIKIMAC_CONF_BROADCAST_RATE_LIMIT */
return 0;
#endif /* CONTIKIMAC_CONF_BROADCAST_RATE_LIMIT */
}
/*---------------------------------------------------------------------------*/
static int
Improved handling of neighbor phase estimation: instead of busy-waiting while waiting for neighbor's phase, the new code schedules a timer just before neighbor wakes up
2010-02-28 20:19:47 +00:00
send_packet(mac_callback_t mac_callback, void *mac_callback_ptr)
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
{
rtimer_clock_t t0;
rtimer_clock_t t;
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
rtimer_clock_t encounter_time = 0, last_transmission_time = 0;
uint8_t first_transmission = 1;
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
int strobes;
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
uint8_t got_strobe_ack = 0;
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
int hdrlen, len;
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
uint8_t is_broadcast = 0;
uint8_t is_reliable = 0;
uint8_t is_known_receiver = 0;
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
uint8_t collisions;
int transmit_len;
int i;
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
int ret;
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
#if WITH_CONTIKIMAC_HEADER
struct hdr *chdr;
#endif /* WITH_CONTIKIMAC_HEADER */
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
Rework of the timing conditions of ContikiMAC: the old timing did not work well on real hardware, the new one seems to work better
2010-03-09 13:19:05 +00:00
if(packetbuf_totlen() == 0) {
PRINTF("contikimac: send_packet data len 0\n");
return MAC_TX_ERR_FATAL;
}
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
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");
Added an optional rate limit for broadcast transmissions
2010-04-06 11:57:43 +00:00
if(broadcast_rate_drop()) {
return MAC_TX_COLLISION;
}
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
} 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]);
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
#else /* UIP_CONF_IPV6 */
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
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);
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
if(WITH_STREAMING) {
if(packetbuf_attr(PACKETBUF_ATTR_PACKET_TYPE) ==
PACKETBUF_ATTR_PACKET_TYPE_STREAM) {
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;
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
is_streaming = 1;
After a lot of tweaking and twiddling with the timing of the ContikiMAC code and the mechanisms in the CC2420 driver, things seem to work somewhat stable now - knock on wood!
2010-04-04 07:49:30 +00:00
} else {
is_streaming = 0;
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
}
}
Small timing tweaks
2010-04-04 21:01:24 +00:00
if(is_streaming) {
Improved phase lock behaviour when neighbor is not duty cycling: senders notify receivers via the 802.15.4 pending bit that they are not duty cycling. Neighbors then will start sending packets immediately and not wait for neighbors' phase. Tweaking of ContikiMAC timers to make it more reliable.
2010-04-03 13:28:30 +00:00
packetbuf_set_attr(PACKETBUF_ATTR_PENDING, 1);
}
Added a packetbuf flag that indicates if the link layer acks should be used or not
2010-04-30 07:25:51 +00:00
packetbuf_set_attr(PACKETBUF_ATTR_MAC_ACK, 1);
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
#if WITH_CONTIKIMAC_HEADER
hdrlen = packetbuf_totlen();
if(packetbuf_hdralloc(sizeof(struct hdr)) == 0) {
/* Failed to allocate space for contikimac header */
PRINTF("contikimac: send failed, too large header\n");
return MAC_TX_ERR_FATAL;
}
chdr = packetbuf_hdrptr();
chdr->id = CONTIKIMAC_ID;
chdr->len = hdrlen;
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
/* Create the MAC header for the data packet. */
hdrlen = NETSTACK_FRAMER.create();
if(hdrlen == 0) {
/* Failed to send */
PRINTF("contikimac: send failed, too large header\n");
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
packetbuf_hdr_remove(sizeof(struct hdr));
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
return MAC_TX_ERR_FATAL;
}
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
hdrlen += sizeof(struct hdr);
#else /* WITH_CONTIKIMAC_HEADER */
/* Create the MAC header for the data packet. */
hdrlen = NETSTACK_FRAMER.create();
if(hdrlen == 0) {
/* Failed to send */
PRINTF("contikimac: send failed, too large header\n");
return MAC_TX_ERR_FATAL;
}
#endif /* WITH_CONTIKIMAC_HEADER */
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
/* Make sure that the packet is longer or equal to the shortest
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
packet length. */
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
transmit_len = packetbuf_totlen();
if(transmit_len < SHORTEST_PACKET_SIZE) {
#if 0
/* Pad with zeroes */
uint8_t *ptr;
ptr = packetbuf_dataptr();
memset(ptr + packetbuf_datalen(), 0, SHORTEST_PACKET_SIZE - packetbuf_totlen());
#endif
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
PRINTF("contikimac: shorter than shortest (%d)\n", packetbuf_totlen());
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
transmit_len = SHORTEST_PACKET_SIZE;
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
}
packetbuf_compact();
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
NETSTACK_RADIO.prepare(packetbuf_hdrptr(), transmit_len);
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
/* Remove the MAC-layer header since it will be recreated next time around. */
packetbuf_hdr_remove(hdrlen);
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
if(!is_broadcast && !is_streaming) {
#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) {
ret = phase_wait(&phase_list, packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
CYCLE_TIME, GUARD_TIME,
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
mac_callback, mac_callback_ptr);
if(ret == PHASE_DEFERRED) {
return MAC_TX_DEFERRED;
}
if(ret != PHASE_UNKNOWN) {
is_known_receiver = 1;
}
}
} else {
ret = phase_wait(&phase_list, packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
CYCLE_TIME, GUARD_TIME,
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
mac_callback, mac_callback_ptr);
if(ret == PHASE_DEFERRED) {
return MAC_TX_DEFERRED;
}
if(ret != PHASE_UNKNOWN) {
is_known_receiver = 1;
}
}
#endif /* WITH_PHASE_OPTIMIZATION */
}
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
/* 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;
Improved detection of link-layer ACKs; increased the time ContikiMAC waits when it has detected a link-layer ACK; increased the number of silence periods required to detect a CCA false positive
2010-02-28 08:33:21 +00:00
PRINTF("contikimac: collision receiving %d, pending %d\n",
NETSTACK_RADIO.receiving_packet(), NETSTACK_RADIO.pending_packet());
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
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;
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
off();
Rework of the timing conditions of ContikiMAC: the old timing did not work well on real hardware, the new one seems to work better
2010-03-09 13:19:05 +00:00
PRINTF("contikimac: collisions before sending\n");
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
return MAC_TX_COLLISION;
}
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
if(!is_broadcast) {
on();
}
Bugfix: the return value sometimes was wrong when a collision was detected.
2010-10-03 20:39:24 +00:00
watchdog_periodic();
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
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
Extend the length of announcement packets if they are too short
2010-03-19 13:24:58 +00:00
watchdog_periodic();
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
After a lot of tweaking and twiddling with the timing of the ContikiMAC code and the mechanisms in the CC2420 driver, things seem to work somewhat stable now - knock on wood!
2010-04-04 07:49:30 +00:00
if(is_known_receiver && !RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + MAX_PHASE_STROBE_TIME)) {
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
break;
After a lot of tweaking and twiddling with the timing of the ContikiMAC code and the mechanisms in the CC2420 driver, things seem to work somewhat stable now - knock on wood!
2010-04-04 07:49:30 +00:00
}
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
len = 0;
t = RTIMER_NOW();
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
{
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
rtimer_clock_t wt;
rtimer_clock_t now = RTIMER_NOW();
After a lot of tweaking and twiddling with the timing of the ContikiMAC code and the mechanisms in the CC2420 driver, things seem to work somewhat stable now - knock on wood!
2010-04-04 07:49:30 +00:00
int ret;
ret = NETSTACK_RADIO.transmit(transmit_len);
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
wt = RTIMER_NOW();
#if NURTIMER
Avoid newlines in macro expansions as cc65 doesn't support them between the macro name and the open parenthesis of the arguments. There were btw other even longer lines with expansions of the same macro already present.
2010-03-14 12:13:54 +00:00
while(RTIMER_CLOCK_LT(wt, RTIMER_NOW(), wt + INTER_PACKET_INTERVAL));
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#else
Avoid newlines in macro expansions as cc65 doesn't support them between the macro name and the open parenthesis of the arguments. There were btw other even longer lines with expansions of the same macro already present.
2010-03-14 12:13:54 +00:00
while(RTIMER_CLOCK_LT(RTIMER_NOW(), wt + INTER_PACKET_INTERVAL)) { }
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#endif
Improved detection of link-layer ACKs; increased the time ContikiMAC waits when it has detected a link-layer ACK; increased the number of silence periods required to detect a CCA false positive
2010-02-28 08:33:21 +00:00
if(!is_broadcast && (NETSTACK_RADIO.receiving_packet() ||
NETSTACK_RADIO.pending_packet() ||
NETSTACK_RADIO.channel_clear() == 0)) {
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
uint8_t ackbuf[ACK_LEN];
wt = RTIMER_NOW();
#if NURTIMER
Avoid newlines in macro expansions as cc65 doesn't support them between the macro name and the open parenthesis of the arguments. There were btw other even longer lines with expansions of the same macro already present.
2010-03-14 12:13:54 +00:00
while(RTIMER_CLOCK_LT(wt, RTIMER_NOW(), wt + AFTER_ACK_DETECTECT_WAIT_TIME));
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#else
Avoid newlines in macro expansions as cc65 doesn't support them between the macro name and the open parenthesis of the arguments. There were btw other even longer lines with expansions of the same macro already present.
2010-03-14 12:13:54 +00:00
while(RTIMER_CLOCK_LT(RTIMER_NOW(), wt + AFTER_ACK_DETECTECT_WAIT_TIME)) { }
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#endif
Improved detection of link-layer ACKs; increased the time ContikiMAC waits when it has detected a link-layer ACK; increased the number of silence periods required to detect a CCA false positive
2010-02-28 08:33:21 +00:00
len = NETSTACK_RADIO.read(ackbuf, ACK_LEN);
if(len == ACK_LEN) {
got_strobe_ack = 1;
Fiddled with the timing
2010-03-31 11:54:38 +00:00
// encounter_time = last_transmission_time;
encounter_time = now;
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
break;
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
} else {
Rework of the timing conditions of ContikiMAC: the old timing did not work well on real hardware, the new one seems to work better
2010-03-09 13:19:05 +00:00
PRINTF("contikimac: collisions while sending\n");
Improved detection of link-layer ACKs; increased the time ContikiMAC waits when it has detected a link-layer ACK; increased the number of silence periods required to detect a CCA false positive
2010-02-28 08:33:21 +00:00
collisions++;
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
}
}
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
last_transmission_time = now;
first_transmission = 0;
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
}
}
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
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();
}
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
} else {
off();
}
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
PRINTF("contikimac: send (strobes=%u, len=%u, %s, %s), done\n", strobes,
packetbuf_totlen(),
got_strobe_ack ? "ack" : "no ack",
collisions ? "collision" : "no collision");
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#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;
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
/* Determine the return value that we will return from the
function. We must pass this value to the phase module before we
return from the function. */
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
if(collisions > 0) {
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
ret = MAC_TX_COLLISION;
Bugfix: the return value sometimes was wrong when a collision was detected.
2010-10-03 20:39:24 +00:00
} else if(!is_broadcast && !got_strobe_ack) {
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
ret = MAC_TX_NOACK;
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
} else {
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
ret = MAC_TX_OK;
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
}
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
#if WITH_PHASE_OPTIMIZATION
After a lot of tweaking and twiddling with the timing of the ContikiMAC code and the mechanisms in the CC2420 driver, things seem to work somewhat stable now - knock on wood!
2010-04-04 07:49:30 +00:00
/* if(!first_transmission)*/ {
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
/* COOJA_DEBUG_PRINTF("first phase 0x%02x\n", encounter_time % CYCLE_TIME);*/
Two major changes: * Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
2010-03-14 22:59:23 +00:00
if(WITH_ACK_OPTIMIZATION) {
if(collisions == 0 && packetbuf_attr(PACKETBUF_ATTR_PACKET_TYPE) !=
PACKETBUF_ATTR_PACKET_TYPE_ACK && is_streaming == 0) {
phase_update(&phase_list, packetbuf_addr(PACKETBUF_ADDR_RECEIVER), encounter_time,
ret);
}
} else {
if(collisions == 0 && is_streaming == 0) {
phase_update(&phase_list, packetbuf_addr(PACKETBUF_ADDR_RECEIVER), encounter_time,
ret);
}
}
}
#endif /* WITH_PHASE_OPTIMIZATION */
return ret;
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
}
/*---------------------------------------------------------------------------*/
static void
qsend_packet(mac_callback_t sent, void *ptr)
{
Improved handling of neighbor phase estimation: instead of busy-waiting while waiting for neighbor's phase, the new code schedules a timer just before neighbor wakes up
2010-02-28 20:19:47 +00:00
int ret = send_packet(sent, ptr);
Don't call up the netstack if the transmission was deferred
2010-03-09 20:37:02 +00:00
if(ret != MAC_TX_DEFERRED) {
mac_call_sent_callback(sent, ptr, ret, 1);
}
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
}
/*---------------------------------------------------------------------------*/
static void
input_packet(void)
{
/* We have received the packet, so we can go back to being
asleep. */
off();
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
/* printf("cycle_start 0x%02x 0x%02x\n", cycle_start, cycle_start % CYCLE_TIME);*/
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
Replaced old framer (framer_get/framer_set) with new NETSTACK style configuration. Added nullrdc-framer that is a nullrdc with framer support.
2010-03-01 13:30:21 +00:00
if(packetbuf_totlen() > 0 && NETSTACK_FRAMER.parse()) {
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
#if WITH_CONTIKIMAC_HEADER
struct hdr *chdr;
chdr = packetbuf_dataptr();
if(chdr->id != CONTIKIMAC_ID) {
PRINTF("contikimac: failed to parse hdr (%u)\n", packetbuf_totlen());
return;
}
packetbuf_hdrreduce(sizeof(struct hdr));
packetbuf_set_datalen(chdr->len);
#endif /* WITH_CONTIKIMAC_HEADER */
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
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. */
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
#if CONTIKIMAC_CONF_ANNOUNCEMENTS
{
struct announcement_msg *hdr = packetbuf_dataptr();
uint8_t magic[2];
memcpy(magic, hdr->announcement_magic, 2);
if(magic[0] == ANNOUNCEMENT_MAGIC1 &&
magic[1] == ANNOUNCEMENT_MAGIC2) {
parse_announcements();
}
}
#endif /* CONTIKIMAC_CONF_ANNOUNCEMENTS */
Improved phase lock behaviour when neighbor is not duty cycling: senders notify receivers via the 802.15.4 pending bit that they are not duty cycling. Neighbors then will start sending packets immediately and not wait for neighbors' phase. Tweaking of ContikiMAC timers to make it more reliable.
2010-04-03 13:28:30 +00:00
#if WITH_PHASE_OPTIMIZATION
/* If the sender has set its pending flag, it has its radio
turned on and we should drop the phase estimation that we
have from before. */
if(packetbuf_attr(PACKETBUF_ATTR_PENDING)) {
phase_remove(&phase_list, packetbuf_addr(PACKETBUF_ADDR_SENDER));
}
#endif /* WITH_PHASE_OPTIMIZATION */
Added MAC-layer duplicate message suppression, which is very helpful when running with duty cycling turned off
2010-04-05 19:28:07 +00:00
/* Check for duplicate packet by comparing the sequence number
Improved handling of duplicate packets
2010-04-08 09:32:56 +00:00
of the incoming packet with the last few ones we saw. */
{
int i;
for(i = 0; i < MAX_SEQNOS; ++i) {
if(packetbuf_attr(PACKETBUF_ATTR_PACKET_ID) == received_seqnos[i].seqno &&
rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_SENDER),
&received_seqnos[i].sender)) {
/* Drop the packet. */
/* printf("Drop duplicate ContikiMAC layer packet\n");*/
return;
}
}
for(i = MAX_SEQNOS - 1; i > 0; --i) {
memcpy(&received_seqnos[i], &received_seqnos[i - 1],
sizeof(struct seqno));
}
received_seqnos[0].seqno = packetbuf_attr(PACKETBUF_ATTR_PACKET_ID);
rimeaddr_copy(&received_seqnos[0].sender,
packetbuf_addr(PACKETBUF_ADDR_SENDER));
Added MAC-layer duplicate message suppression, which is very helpful when running with duty cycling turned off
2010-04-05 19:28:07 +00:00
}
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#if CONTIKIMAC_CONF_COMPOWER
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
/* 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);
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#endif /* CONTIKIMAC_CONF_COMPOWER */
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
PRINTDEBUG("contikimac: data (%u)\n", packetbuf_datalen());
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
NETSTACK_MAC.input();
return;
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
} else {
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
PRINTDEBUG("contikimac: data not for us\n");
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
}
} else {
PRINTF("contikimac: failed to parse (%u)\n", packetbuf_totlen());
}
}
/*---------------------------------------------------------------------------*/
#if CONTIKIMAC_CONF_ANNOUNCEMENTS
static void
send_announcement(void *ptr)
{
int announcement_len;
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
int transmit_len;
#if WITH_CONTIKIMAC_HEADER
Bugfix: the return value sometimes was wrong when a collision was detected.
2010-10-03 20:39:24 +00:00
struct hdr *chdr;
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
#endif /* WITH_CONTIKIMAC_HEADER */
Bugfix: the return value sometimes was wrong when a collision was detected.
2010-10-03 20:39:24 +00:00
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
/* Set up the probe header. */
packetbuf_clear();
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
announcement_len = format_announcement(packetbuf_dataptr());
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
if(announcement_len > 0) {
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
packetbuf_set_datalen(announcement_len);
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
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);
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
#if WITH_CONTIKIMAC_HEADER
transmit_len = packetbuf_totlen();
if(packetbuf_hdralloc(sizeof(struct hdr)) == 0) {
/* Failed to allocate space for contikimac header */
PRINTF("contikimac: send announcement failed, too large header\n");
return;
}
chdr = packetbuf_hdrptr();
chdr->id = CONTIKIMAC_ID;
chdr->len = transmit_len;
#endif /* WITH_CONTIKIMAC_HEADER */
Replaced old framer (framer_get/framer_set) with new NETSTACK style configuration. Added nullrdc-framer that is a nullrdc with framer support.
2010-03-01 13:30:21 +00:00
if(NETSTACK_FRAMER.create()) {
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
rtimer_clock_t t;
int i, collisions;
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
we_are_sending = 1;
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
/* Make sure that the packet is longer or equal to the shorest
packet length. */
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
transmit_len = packetbuf_totlen();
if(transmit_len < SHORTEST_PACKET_SIZE) {
#if 0
/* Pad with zeroes */
uint8_t *ptr;
ptr = packetbuf_dataptr();
code cleanup
2010-04-26 17:55:11 +00:00
memset(ptr + packetbuf_datalen(), 0, SHORTEST_PACKET_SIZE - transmit_len);
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
#endif
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
PRINTF("contikimac: shorter than shortest (%d)\n", packetbuf_totlen());
code cleanup
2010-04-26 17:55:11 +00:00
transmit_len = SHORTEST_PACKET_SIZE;
Extend packet size after creating 802.15.4 header; prepare radio chip with packet before waiting for neighbor phase to make phase wait time deterministic
2010-03-29 21:51:36 +00:00
}
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
collisions = 0;
/* Check for collisions */
for(i = 0; i < CCA_COUNT_MAX; ++i) {
t = RTIMER_NOW();
on();
#if NURTIMER
while(RTIMER_CLOCK_LT(t, RTIMER_NOW(), t + CCA_CHECK_TIME));
#else
while(RTIMER_CLOCK_LT(RTIMER_NOW(), t + CCA_CHECK_TIME));
#endif
if(NETSTACK_RADIO.channel_clear() == 0) {
collisions++;
off();
break;
}
off();
#if NURTIMER
while(RTIMER_CLOCK_LT(t0, RTIMER_NOW(), t + CCA_SLEEP_TIME + CCA_CHECK_TIME));
#else
while(RTIMER_CLOCK_LT(RTIMER_NOW(), t + CCA_SLEEP_TIME + CCA_CHECK_TIME)) { }
#endif
}
Improved phase lock behaviour when neighbor is not duty cycling: senders notify receivers via the 802.15.4 pending bit that they are not duty cycling. Neighbors then will start sending packets immediately and not wait for neighbors' phase. Tweaking of ContikiMAC timers to make it more reliable.
2010-04-03 13:28:30 +00:00
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
if(collisions == 0) {
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
NETSTACK_RADIO.prepare(packetbuf_hdrptr(), transmit_len);
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
NETSTACK_RADIO.transmit(transmit_len);
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
t = RTIMER_NOW();
#if NURTIMER
while(RTIMER_CLOCK_LT(t, RTIMER_NOW(), t + INTER_PACKET_INTERVAL));
#else
while(RTIMER_CLOCK_LT(RTIMER_NOW(), t + INTER_PACKET_INTERVAL)) { }
#endif
Added MAC header to handle padding
2010-04-26 17:46:21 +00:00
NETSTACK_RADIO.transmit(transmit_len);
Bugfixes in low-power streaming mode, and re-added support for announcements. These now use the low-power streaming mode so that active listening for announcments have a radio duty cycle of 16% rather than 100%
2010-03-16 18:11:13 +00:00
}
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
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);
Bugfixed stream mode: node listens 100% for 0.5 seconds in stream mode. Naming change: is_listening changed is_snooping.
2010-04-01 10:02:04 +00:00
if(is_snooping > 0) {
is_snooping--;
/* printf("is_snooping %d\n", is_snooping); */
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
}
}
/*---------------------------------------------------------------------------*/
static void
listen_callback(int periods)
{
Fiddled more with the timing: the phase seems stable now at least. Still bugs left though...
2010-04-04 12:28:29 +00:00
printf("Snoop\n");
Bugfixed stream mode: node listens 100% for 0.5 seconds in stream mode. Naming change: is_listening changed is_snooping.
2010-04-01 10:02:04 +00:00
is_snooping = periods + 1;
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
}
#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)
{
After a lot of tweaking and twiddling with the timing of the ContikiMAC code and the mechanisms in the CC2420 driver, things seem to work somewhat stable now - knock on wood!
2010-04-04 07:49:30 +00:00
if(contikimac_is_on == 0) {
contikimac_is_on = 1;
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#if NURTIMER
After a lot of tweaking and twiddling with the timing of the ContikiMAC code and the mechanisms in the CC2420 driver, things seem to work somewhat stable now - knock on wood!
2010-04-04 07:49:30 +00:00
rtimer_schedule(&rt, CYCLE_TIME, 1);
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#else
After a lot of tweaking and twiddling with the timing of the ContikiMAC code and the mechanisms in the CC2420 driver, things seem to work somewhat stable now - knock on wood!
2010-04-04 07:49:30 +00:00
rtimer_set(&rt, RTIMER_NOW() + CYCLE_TIME, 1,
(void (*)(struct rtimer *, void *))powercycle, NULL);
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
#endif
After a lot of tweaking and twiddling with the timing of the ContikiMAC code and the mechanisms in the CC2420 driver, things seem to work somewhat stable now - knock on wood!
2010-04-04 07:49:30 +00:00
}
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
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;
}
/*---------------------------------------------------------------------------*/
Changed the network stack to use different structures for the different layers (network_driver, mac_driver, rdc_driver, radio_driver). This helps to avoid incorrect configuration.
2010-02-23 20:09:11 +00:00
const struct rdc_driver contikimac_driver = {
ntikiMAC: a new radio duty cycling mechanism that uses a combination of link-layer and MAC-layer mechanisms to achieve a very low power consumption: during idle listening the radio is switched off between 99.2% and 99.6% of the time. One unicast transmission typically adds between 0.07% and 1.2% additional radio time, depending on packet size. ContikiMAC uses the standard IEEE 802.15.4 message format and adds no additional headers. ContikiMAC is simple: it uses periodic two-shot channel sampling during idle listening to keep the radio on-time down. Transmissions are done with repeated transmissions until a link-layer ACK is received.
2010-02-18 21:26:15 +00:00
"ContikiMAC",
init,
qsend_packet,
input_packet,
turn_on,
turn_off,
duty_cycle,
};
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
/*---------------------------------------------------------------------------*/
uint16_t
contikimac_debug_print(void)
{
Fiddled more with the timing: the phase seems stable now at least. Still bugs left though...
2010-04-04 12:28:29 +00:00
static rtimer_clock_t one_cycle_start;
printf("Drift %d\n", (one_cycle_start - cycle_start) % CYCLE_TIME);
one_cycle_start = cycle_start;
Improved detection of link-layer ACKs; increased the time ContikiMAC waits when it has detected a link-layer ACK; increased the number of silence periods required to detect a CCA false positive
2010-02-28 08:33:21 +00:00
return 0;
Rework of parts of the ContikiMAC code based on input from experimental results. When channel check is triggered because of a false positive, the new version checks the radio several times to make sure that there really is an incoming packet. Otherwise, the radio is switched off. Cleaned up and removed old unused code. Added a few temporary debugging mechanisms and functions.
2010-02-23 18:49:05 +00:00
}
/*---------------------------------------------------------------------------*/
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