Rewrote most of the X-MAC code to make it easier to follow, debug and modify. Also added an optional, experimental time synchronized addition that makes X-MACs on different nodes explicitly de-synchronized
This commit is contained in:
adamdunkels
parent
c2ef303c24
commit
8a9b931a4b
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@ -28,7 +28,7 @@
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*
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* This file is part of the Contiki operating system.
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*
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* $Id: xmac.c,v 1.13 2008/01/14 09:26:42 adamdunkels Exp $
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* $Id: xmac.c,v 1.14 2008/01/23 15:00:54 adamdunkels Exp $
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*/
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/**
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@ -43,16 +43,21 @@
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#include "sys/rtimer.h"
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#include "dev/leds.h"
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#include "net/rime.h"
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#include "net/rime/timesynch.h"
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#include "dev/radio.h"
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#include "lib/random.h"
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/*#include "lib/bb.h"*/
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#include "sys/timetable.h"
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#include "contiki-conf.h"
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#if CHAMELEON
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#include "net/chameleon/packattr.h"
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#endif
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#define WITH_CHANNEL_CHECK 0 /* Seems to work bad */
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#define WITH_TIMESYNCH 1
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#define WITH_RECEIVER 1
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#define WITH_QUEUE 0
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@ -79,15 +84,15 @@ struct xmac_hdr {
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#ifdef XMAC_CONF_OFF_TIME
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#define DEFAULT_OFF_TIME (XMAC_CONF_OFF_TIME)
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#else
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#define DEFAULT_OFF_TIME ((RTIMER_ARCH_SECOND / 2) - DEFAULT_ON_TIME)
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#define DEFAULT_OFF_TIME (RTIMER_ARCH_SECOND / 2 - DEFAULT_ON_TIME)
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#endif
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#define DEFAULT_STROBE_WAIT_TIME (DEFAULT_ON_TIME) / 2
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#define DEFAULT_STROBE_WAIT_TIME (DEFAULT_ON_TIME / 2)
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struct xmac_config xmac_config = {
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DEFAULT_ON_TIME,
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DEFAULT_OFF_TIME,
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DEFAULT_ON_TIME + DEFAULT_OFF_TIME,
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2 * DEFAULT_ON_TIME + DEFAULT_OFF_TIME,
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DEFAULT_STROBE_WAIT_TIME
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};
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@ -97,7 +102,7 @@ static struct pt pt;
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static int xmac_is_on = 0;
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static volatile unsigned char should_be_awake = 0;
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static volatile unsigned char waiting_for_packet = 0;
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static volatile unsigned char someone_is_sending = 0;
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static volatile unsigned char we_are_sending = 0;
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static volatile unsigned char radio_is_on = 0;
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@ -109,6 +114,7 @@ static const struct radio_driver *radio;
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#undef LEDS_TOGGLE
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#define CPRINTF(...)
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#define BB_SET(x,y)
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#define BB_INC(x,y)
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@ -132,6 +138,9 @@ static const struct radio_driver *radio;
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#endif
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static void (* receiver_callback)(const struct mac_driver *);
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#define xmac_timetable_size 256
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TIMETABLE_NONSTATIC(xmac_timetable);
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/*---------------------------------------------------------------------------*/
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static void
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set_receive_function(void (* recv)(const struct mac_driver *))
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@ -139,12 +148,39 @@ set_receive_function(void (* recv)(const struct mac_driver *))
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receiver_callback = recv;
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}
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/*---------------------------------------------------------------------------*/
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static void
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on(void)
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{
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if(radio_is_on == 0) {
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radio_is_on = 1;
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radio->on();
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LEDS_ON(LEDS_RED);
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CPRINTF("/");
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TIMETABLE_TIMESTAMP(xmac_timetable, "on");
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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off(void)
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{
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if(radio_is_on != 0) {
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radio_is_on = 0;
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radio->off();
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TIMETABLE_TIMESTAMP(xmac_timetable, "off");
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LEDS_OFF(LEDS_RED);
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CPRINTF("\\");
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}
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}
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/*---------------------------------------------------------------------------*/
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static char
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powercycle(struct rtimer *t, void *ptr)
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{
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int r;
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#if WITH_TIMESYNCH
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rtimer_clock_t should_be, adjust;
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#endif /* WITH_TIMESYNCH */
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/* printf("%d\n", pt.lc);*/
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CPRINTF("*");
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PT_BEGIN(&pt);
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@ -155,37 +191,59 @@ powercycle(struct rtimer *t, void *ptr)
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}
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if(xmac_config.off_time > 0) {
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if(should_be_awake == 0) {
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if(xmac_is_on && we_are_sending == 0) {
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radio->off();
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LEDS_OFF(LEDS_RED);
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radio_is_on = 0;
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if(waiting_for_packet == 0) {
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if(xmac_is_on &&
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we_are_sending == 0) {
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off();
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}
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} else {
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should_be_awake++;
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if(should_be_awake > 2) {
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should_be_awake = 0;
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waiting_for_packet++;
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if(waiting_for_packet > 2) {
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/* We should not be awake for more than two consecutive
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power cycles without having heard a packet, so we turn off
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the radio. */
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waiting_for_packet = 0;
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TIMETABLE_TIMESTAMP(xmac_timetable, "off waiting");
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off();
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}
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}
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#if WITH_TIMESYNCH
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#define NUM_SLOTS 8
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should_be = ((timesynch_rtimer_to_time(RTIMER_TIME(t)) +
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xmac_config.off_time) &
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~(xmac_config.off_time + xmac_config.on_time - 1)) +
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(rimeaddr_node_addr.u8[0] % NUM_SLOTS *
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((xmac_config.off_time + xmac_config.on_time) / NUM_SLOTS));
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should_be = timesynch_time_to_rtimer(should_be);
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if(should_be - RTIMER_TIME(t) > xmac_config.off_time) {
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adjust = xmac_config.off_time / 2;
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} else {
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adjust = should_be - RTIMER_TIME(t);
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}
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r = rtimer_set(t, RTIMER_TIME(t) + adjust, 1,
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(void (*)(struct rtimer *, void *))powercycle, ptr);
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#else /* WITH_TIMESYNCH */
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r = rtimer_set(t, RTIMER_TIME(t) + xmac_config.off_time, 1,
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(void (*)(struct rtimer *, void *))powercycle, ptr);
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#endif /* WITH_TIMESYNCH */
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if(r) {
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PRINTF("xmac: 1 could not set rtimer %d\n", r);
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}
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PT_YIELD(&pt);
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}
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if(radio_is_on == 0) {
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if(xmac_is_on && we_are_sending == 0 && should_be_awake == 0) {
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radio->on();
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LEDS_ON(LEDS_RED);
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radio_is_on = 1;
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}
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if(xmac_is_on &&
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we_are_sending == 0 &&
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waiting_for_packet == 0) {
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on();
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}
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r = rtimer_set(t, RTIMER_TIME(t) + xmac_config.on_time, 1,
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(void (*)(struct rtimer *, void *))powercycle, ptr);
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if(r) {
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PRINTF("xmac: 2 could not set rtimer %d\n", r);
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PRINTF("xmac: 3 could not set rtimer %d\n", r);
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}
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PT_YIELD(&pt);
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@ -205,18 +263,32 @@ send_packet(void)
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struct xmac_hdr msg;
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int len;
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TIMETABLE_TIMESTAMP(xmac_timetable, "send");
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#if WITH_CHANNEL_CHECK
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/* Check if there are other strobes in the air. */
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waiting_for_packet = 1;
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on();
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t0 = RTIMER_NOW();
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while(RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + xmac_config.strobe_wait_time * 2)) {
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len = radio->read(&msg, sizeof(msg));
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if(len > 0) {
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someone_is_sending = 1;
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}
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}
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waiting_for_packet = 0;
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while(someone_is_sending); /* {printf("z");}*/
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TIMETABLE_TIMESTAMP(xmac_timetable, "send 2");
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#endif /* WITH_CHANNEL_CHECK */
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/* By setting we_are_sending to one, we ensure that the rtimer
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powercycle interrupt do not interfere with us sending the packet. */
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we_are_sending = 1;
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radio->on();
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LEDS_ON(LEDS_RED);
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radio_is_on = 1;
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/* printf("xmac_send\n");*/
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#if !CHAMELEON
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PRINTF("xmac: send() len %d to %d.%d\n", rimebuf_totlen(),
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uc_receiver.u8[0], uc_receiver.u8[1]);
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#endif
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off();
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rimebuf_hdralloc(sizeof(struct xmac_hdr));
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hdr = rimebuf_hdrptr();
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rimeaddr_copy(&hdr->sender, &rimeaddr_node_addr);
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@ -231,15 +303,20 @@ send_packet(void)
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strobes = 0;
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BB_SET(XMAC_RECEIVER, hdr->receiver.u16[0]);
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LEDS_ON(LEDS_BLUE);
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LEDS_ON(LEDS_YELLOW);
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do {
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/* Send a train of strobes until the receiver answers with an ACK. */
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if(strobes & 1) {
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LEDS_OFF(LEDS_GREEN);
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} else {
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LEDS_ON(LEDS_GREEN);
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}
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/* Turn on the radio to listen for the strobe ACK. XXX for
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broadcasts, don't turn radio on at all. */
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on();
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got_ack = 0;
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for(strobes = 0;
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got_ack == 0 &&
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RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + xmac_config.strobe_time);
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strobes++) {
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t = RTIMER_NOW();
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@ -250,48 +327,51 @@ send_packet(void)
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rimeaddr_copy(&msg.receiver, &uc_receiver);
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#endif
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/* printf("sender %d.%d receiver %d.%d node %d.%d.\n",
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msg.sender.u8[0],msg.sender.u8[1],
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msg.receiver.u8[0],msg.receiver.u8[1],
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);*/
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TIMETABLE_TIMESTAMP(xmac_timetable, "send strobe");
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/* Send the strobe packet. */
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radio->send((const u8_t *)&msg, sizeof(struct xmac_hdr));
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CPRINTF("+");
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while(RTIMER_CLOCK_LT(RTIMER_NOW(), t + xmac_config.strobe_wait_time)) {
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PRINTF("xmac: now %u then %u wait %d\n",
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RTIMER_NOW(), t, xmac_config.strobe_wait_time);
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while(got_ack == 0 &&
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RTIMER_CLOCK_LT(RTIMER_NOW(), t + xmac_config.strobe_wait_time)) {
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/* See if we got an ACK */
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/* printf("before read\n");*/
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len = radio->read((u8_t *)&msg, sizeof(struct xmac_hdr));
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/* printf("after read len %d\n", len);*/
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if(len > 0) {
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PRINTF("xmac: len %d sender %d.%d receiver %d.%d node %d.%d.\n", len,
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msg.sender.u8[0],msg.sender.u8[1],
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msg.receiver.u8[0],msg.receiver.u8[1],
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
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CPRINTF("_");
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if(rimeaddr_cmp(&msg.sender, &rimeaddr_node_addr) &&
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rimeaddr_cmp(&msg.receiver, &rimeaddr_node_addr)) {
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TIMETABLE_TIMESTAMP(xmac_timetable, "send ack received");
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CPRINTF("@");
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/* We got an ACK from the receiver, so we can immediately send
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the packet. */
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got_ack = 1;
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break;
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} else {
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/* RIMESTATS_ADD(sendingdrop);*/
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}
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}
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}
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/* PRINTF("xmac Strobe %d got_ack %d\n", strobes, got_ack);*/
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++strobes;
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if(got_ack) {
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break;
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}
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} while(RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + xmac_config.strobe_time));
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LEDS_OFF(LEDS_YELLOW);
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/* XXX: turn off radio if we haven't heard an ACK within a
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specified time interval. */
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radio->send(rimebuf_hdrptr(), rimebuf_totlen());
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/* if(got_ack == 0) {
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off();
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while(RTIMER_CLOCK_LT(RTIMER_NOW(), t + xmac_config.strobe_wait_time));
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on();
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}*/
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}
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if(got_ack /* XXX && needs_ack */) {
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TIMETABLE_TIMESTAMP(xmac_timetable, "send got ack");
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on(); /* Wait for possible ACK packet */
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} else {
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on(); /* shell ping don't seem to work with off() here, so we'll
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keep it on() for a while. */
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}
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if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_null) || got_ack) {
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TIMETABLE_TIMESTAMP(xmac_timetable, "send packet");
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radio->send(rimebuf_hdrptr(), rimebuf_totlen());
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CPRINTF("#");
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}
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PRINTF("xmac: send (strobes=%u,len=%u,%s), done\n", strobes,
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rimebuf_totlen(), got_ack ? "ack" : "no ack");
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@ -306,7 +386,8 @@ send_packet(void)
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/* printf("Strobe %d got_ack %d\n", strobes, got_ack);*/
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we_are_sending = 0;
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LEDS_OFF(LEDS_GREEN);
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TIMETABLE_TIMESTAMP(xmac_timetable, "send we_are_sending = 0");
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LEDS_OFF(LEDS_BLUE);
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return 1;
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}
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@ -317,7 +398,7 @@ qsend_packet(void)
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{
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if(someone_is_sending) {
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PRINTF("xmac: should queue packet, now just dropping %d %d %d %d.\n",
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should_be_awake, someone_is_sending, we_are_sending, radio_is_on);
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waiting_for_packet, someone_is_sending, we_are_sending, radio_is_on);
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if(queued_packet != NULL) {
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RIMESTATS_ADD(sendingdrop);
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return 0;
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@ -353,75 +434,78 @@ read_packet(void)
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rimebuf_clear();
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PRINTF("xmac: input ");
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len = radio->read(rimebuf_dataptr(), RIMEBUF_SIZE);
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PRINTF("%d bytes\n", len);
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if(len > 0) {
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someone_is_sending = 2;
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rimebuf_set_datalen(len);
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hdr = rimebuf_dataptr();
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rimebuf_hdrreduce(sizeof(struct xmac_hdr));
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if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_node_addr)) {
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should_be_awake = 1;
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radio->on();
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radio_is_on = 1;
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PRINTF("xmac: for us\n");
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/* Only send strobe ack if the packet itself is not a strobe ack
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to us. */
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if(!rimeaddr_cmp(&hdr->sender, &rimeaddr_node_addr) &&
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rimebuf_totlen() == 0) {
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/* XXX Send an ACK and wait for packet . */
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PRINTF("xmac: got sender %d.%d receiver %d.%d\n",
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hdr->sender.u8[0],hdr->sender.u8[1],
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hdr->receiver.u8[0],hdr->receiver.u8[1]);
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/* while(!radio_is_on) { printf(".");}*/
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if(rimebuf_totlen() == 0) {
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CPRINTF(".");
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/* There is no data in the packet so it has to be a strobe. */
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someone_is_sending = 2;
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if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_node_addr)) {
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/* This is a strobe packet for us. */
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{
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if(rimeaddr_cmp(&hdr->sender, &rimeaddr_node_addr)) {
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/* If the sender address is our node address, the strobe is
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a stray strobe ACK to us, which we ignore unless we are
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currently sending a packet. */
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CPRINTF("&");
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someone_is_sending = 0;
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} else {
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struct xmac_hdr msg;
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/* If the sender address is someone else, we should
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acknowledge the strobe and wait for the packet. By using
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the same address as both sender and receiver, we flag the
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message is a strobe ack. */
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TIMETABLE_TIMESTAMP(xmac_timetable, "read send ack");
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rimeaddr_copy(&msg.receiver, &hdr->sender);
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/* Using the same address as both sender and receiver will
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flag the message as a strobe ack. */
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rimeaddr_copy(&msg.sender, &hdr->sender);
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PRINTF("xmac: sending sender %d.%d receiver %d.%d\n",
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msg.sender.u8[0],msg.sender.u8[1],
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msg.receiver.u8[0],msg.receiver.u8[1]);
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CPRINTF("!");
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/* We turn on the radio in anticipation of the incoming
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packet. */
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someone_is_sending = 1;
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waiting_for_packet = 1;
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on();
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radio->send((const u8_t *)&msg, sizeof(struct xmac_hdr));
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}
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} else if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_null)) {
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/* If the receiver address is null, the strobe is sent to
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prepare for an incoming broadcast packet. If this is the
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case, we turn on the radio and wait for the incoming
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broadcast packet. */
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waiting_for_packet = 1;
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on();
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}
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} else if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_null)) {
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||||
/* Wait for the actual packet to arrive. */
|
||||
should_be_awake = 1;
|
||||
PRINTF("xmac: broadcast from %d.%d\n",
|
||||
hdr->sender.u8[0],hdr->sender.u8[1]);
|
||||
/* PRINTF("xmac: broadcast\n");*/
|
||||
/* We are done processing the strobe and we therefore return
|
||||
to the caller. */
|
||||
return RIME_OK;
|
||||
} else {
|
||||
/* Go back to sleep. XXX should not turn on the radio again
|
||||
until this packet has passed. */
|
||||
radio->off();
|
||||
radio_is_on = 0;
|
||||
should_be_awake = 0;
|
||||
/* long_off = 1;*/
|
||||
/* XXX set timer to turn someone_is_sending off again and send queued packet. */
|
||||
/* PRINTF("xmac: not for us\n");*/
|
||||
}
|
||||
|
||||
if(rimebuf_totlen() > 0) {
|
||||
/* We have received the final packet, so we can go back to being
|
||||
asleep. */
|
||||
CPRINTF("-");
|
||||
someone_is_sending = 0;
|
||||
should_be_awake = 0;
|
||||
PRINTF("xmac: final packet received\n");
|
||||
|
||||
/* XXX should set timer to send queued packet later. */
|
||||
if(queued_packet != NULL) {
|
||||
queuebuf_free(queued_packet);
|
||||
queued_packet = NULL;
|
||||
if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_node_addr) ||
|
||||
rimeaddr_cmp(&hdr->receiver, &rimeaddr_null)) {
|
||||
TIMETABLE_TIMESTAMP(xmac_timetable, "read got packet");
|
||||
/* This is a regular packet that is destined to us or to the
|
||||
broadcast address. */
|
||||
|
||||
/* We have received the final packet, so we can go back to being
|
||||
asleep. */
|
||||
off();
|
||||
waiting_for_packet = 0;
|
||||
|
||||
/* XXX should set timer to send queued packet later. */
|
||||
if(queued_packet != NULL) {
|
||||
queuebuf_free(queued_packet);
|
||||
queued_packet = NULL;
|
||||
}
|
||||
|
||||
return rimebuf_totlen();
|
||||
}
|
||||
|
||||
return rimebuf_totlen();
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
|
|
@ -430,8 +514,9 @@ read_packet(void)
|
|||
const struct mac_driver *
|
||||
xmac_init(const struct radio_driver *d)
|
||||
{
|
||||
timetable_clear(&xmac_timetable);
|
||||
radio_is_on = 0;
|
||||
should_be_awake = 0;
|
||||
waiting_for_packet = 0;
|
||||
PT_INIT(&pt);
|
||||
rtimer_set(&rt, RTIMER_NOW() + xmac_config.off_time, 1,
|
||||
(void (*)(struct rtimer *, void *))powercycle, NULL);
|
||||
|
|
@ -440,7 +525,7 @@ xmac_init(const struct radio_driver *d)
|
|||
radio = d;
|
||||
radio->set_receive_function(input_packet);
|
||||
|
||||
BB_SET("xmac.state_addr", (int) &should_be_awake);
|
||||
BB_SET("xmac.state_addr", (int) &waiting_for_packet);
|
||||
BB_SET(XMAC_RECEIVER, 0);
|
||||
BB_SET(XMAC_STROBES, 0);
|
||||
BB_SET(XMAC_SEND_WITH_ACK, 0);
|
||||
|
|
@ -449,14 +534,14 @@ xmac_init(const struct radio_driver *d)
|
|||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
static int
|
||||
on(void)
|
||||
turn_on(void)
|
||||
{
|
||||
xmac_is_on = 1;
|
||||
return 1;
|
||||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
static int
|
||||
off(void)
|
||||
turn_off(void)
|
||||
{
|
||||
xmac_is_on = 0;
|
||||
return radio->off();
|
||||
|
|
@ -467,6 +552,6 @@ const struct mac_driver xmac_driver =
|
|||
qsend_packet,
|
||||
read_packet,
|
||||
set_receive_function,
|
||||
on,
|
||||
off
|
||||
turn_on,
|
||||
turn_off
|
||||
};
|
||||
|
|
|
|||
Loading…
Reference in a new issue