Added nicer configuration options. Added hack for optimizing X-MAC for unicast packets. Added statistics gathering. Turn radio off when someone else is receiving a packet. Queueing packets when X-MAC cannot send immediately (since someone else is transmitting).
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adamdunkels
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a495d1230b
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edd509acf5
@ -30,7 +30,7 @@
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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 1.3 2007/05/19 13:12:00 oliverschmidt Exp $
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* $Id: xmac.c,v 1.4 2007/05/22 20:55:24 adamdunkels Exp $
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*/
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/**
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@ -51,7 +51,21 @@
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#include "net/chameleon/packattr.h"
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#endif
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extern rimeaddr_t uc_receiver;
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#undef XMAC_CONF_ON_TIME
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#undef XMAC_CONF_OFF_TIME
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#define WITH_RECEIVER 1
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#define WITH_QUEUE 1
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#define XMAC_CONF_ON_TIME RTIMER_ARCH_SECOND / 100
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#define XMAC_CONF_OFF_TIME RTIMER_ARCH_SECOND / 10
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#if WITH_RECEIVER
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extern
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#else
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static
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#endif
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rimeaddr_t uc_receiver;
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struct powercycle {
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struct pt pt;
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@ -68,20 +82,18 @@ struct xmac_hdr {
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static struct rtimer rt;
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static struct pt pt;
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#ifdef XMAC_CONF_BASE_TIME
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#define BASE_TIME XMAC_CONF_BASE_TIME
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#ifdef XMAC_CONF_ON_TIME
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#define ON_TIME (XMAC_CONF_ON_TIME)
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#else
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#define BASE_TIME (RTIMER_ARCH_SECOND / 100)
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#define ON_TIME (RTIMER_ARCH_SECOND / 100)
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#endif
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#ifdef XMAC_CONF_DUTYCYCLE
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#define DUTYCYCLE XMAC_CONF_DUTYCYCLE
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#ifdef XMAC_CONF_OFF_TIME
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#define OFF_TIME (XMAC_CONF_OFF_TIME)
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#else
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#define DUTYCYCLE 10
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#define OFF_TIME (ON_TIME * 10)
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#endif
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#define OFF_TIME BASE_TIME * (DUTYCYCLE)
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#define ON_TIME BASE_TIME
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#define STROBE_WAIT_TIME ON_TIME / 2
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static volatile unsigned char should_be_awake = 0;
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@ -119,9 +131,9 @@ powercycle(struct rtimer *t, void *ptr)
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PT_BEGIN(&pt);
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while(1) {
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rtimer_clock_t t1, t2;
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/* rtimer_clock_t t1, t2; */
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t1 = rtimer_arch_now();
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/* t1 = rtimer_arch_now(); */
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if(should_be_awake == 0) {
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radio->off();
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radio_is_on = 0;
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@ -136,7 +148,7 @@ powercycle(struct rtimer *t, void *ptr)
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(void (*)(struct rtimer *, void *))powercycle, ptr)) {
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PRINTF("xmac: could not set rtimer\n");
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}
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t2 = rtimer_arch_now();
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/* t2 = rtimer_arch_now(); */
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/* printf("xmac 1 %d\n", t2 - t1); */
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PT_YIELD(&pt);
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@ -145,7 +157,7 @@ powercycle(struct rtimer *t, void *ptr)
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PT_YIELD(&pt);
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}
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t1 = rtimer_arch_now();
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/* t1 = rtimer_arch_now(); */
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if(radio_is_on == 0) {
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radio->on();
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radio_is_on = 1;
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@ -155,7 +167,7 @@ powercycle(struct rtimer *t, void *ptr)
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(void (*)(struct rtimer *, void *))powercycle, ptr)) {
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PRINTF("xmac: could not set rtimer\n");
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}
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t2 = rtimer_arch_now();
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/* t2 = rtimer_arch_now(); */
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/* printf("xmac 2 %d\n", t2 - t1); */
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PT_YIELD(&pt);
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@ -169,8 +181,14 @@ powercycle(struct rtimer *t, void *ptr)
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/* XXX should wait for a complete packet that is not destined to
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us to swisch past us. */
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radio->off();
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radio_is_on = 0;
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LEDS_OFF(LEDS_RED);
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if(rtimer_set(t, RTIMER_TIME(t) + OFF_TIME, 1, powercycle, ptr)) {
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PRINTF("xmac: could not set long off rtimer\n");
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}
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long_off = 0;
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someone_is_sending = 0;
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}
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}
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@ -189,9 +207,11 @@ send(void)
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we_are_sending = 1;
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radio->on();
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radio_is_on = 1;
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/* printf("xmac_send\n");*/
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PRINTF("xmac: send() len %d\n", rimebuf_totlen());
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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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rimebuf_hdralloc(sizeof(struct xmac_hdr));
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hdr = rimebuf_hdrptr();
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@ -246,6 +266,8 @@ send(void)
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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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@ -264,7 +286,6 @@ send(void)
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/* printf("Strobe %d got_ack %d\n", strobes, got_ack);*/
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LEDS_OFF(LEDS_GREEN);
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PT_INIT(&pt);
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if(rtimer_set(&rt, RTIMER_NOW() + ON_TIME, 1,
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(void (*)(struct rtimer *, void *))powercycle, NULL)) {
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@ -274,12 +295,22 @@ send(void)
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}
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/*---------------------------------------------------------------------------*/
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static struct queuebuf *queued_packet;
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static void
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qsend(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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if(queued_packet != NULL) {
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RIMESTATS_ADD(contentiondrop);
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} else {
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#if WITH_QUEUE
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queued_packet = queuebuf_new_from_rimebuf();
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#else
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RIMESTATS_ADD(contentiondrop);
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#endif
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}
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} else {
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PRINTF("xmac: send immediately.\n");
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send();
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@ -330,12 +361,14 @@ input(const struct radio_driver *d)
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} else if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_null)) {
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/* Wait for the actual packet to arrive. */
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should_be_awake = 1;
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PRINTF("xmac: broadcast from %d.%d\n",
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hdr->sender.u8[0],hdr->sender.u8[1]);
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/* PRINTF("xmac: broadcast\n");*/
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} else {
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/* Go back to sleep. XXX should not turn on the radio again
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until this packet has passed. */
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should_be_awake = 0;
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someone_is_sending = 0;
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someone_is_sending = 1;
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long_off = 1;
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/* XXX set timer to turn someone_is_sending off again and send queued packet. */
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/* PRINTF("xmac: not for us\n");*/
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@ -350,6 +383,12 @@ input(const struct radio_driver *d)
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PRINTF("xmac: final packet received\n");
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rime_input();
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/* XXX send queued packet. */
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if(queued_packet != NULL) {
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queuebuf_to_rimebuf(queued_packet);
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queuebuf_free(queued_packet);
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queued_packet = NULL;
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send();
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}
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}
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}
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}
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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.h,v 1.2 2007/05/15 08:07:07 adamdunkels Exp $
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* $Id: xmac.h,v 1.3 2007/05/22 20:55:24 adamdunkels Exp $
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*/
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/**
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@ -47,5 +47,4 @@
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void xmac_init(const struct radio_driver *d);
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#endif /* __XMAC_H__ */
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