Added MAC layer framing support to X-MAC so that packets now are standard 802.15.4 frames
This commit is contained in:
adamdunkels
parent
1b26fcd5c7
commit
9ec57d61ad
@ -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 1.37 2009/10/19 06:39:29 adamdunkels Exp $
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* $Id: xmac.c,v 1.38 2009/10/19 20:53:56 adamdunkels Exp $
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*/
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/**
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@ -36,19 +36,21 @@
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* A simple power saving MAC protocol based on X-MAC [SenSys 2006]
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* \author
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* Adam Dunkels <adam@sics.se>
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* Niclas Finne <nfi@sics.se>
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* Joakim Eriksson <joakime@sics.se>
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*/
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#include "sys/pt.h"
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#include "net/mac/xmac.h"
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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 "dev/watchdog.h"
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#include "lib/random.h"
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#include "net/mac/framer.h"
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#include "net/mac/xmac.h"
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#include "net/rime.h"
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#include "net/rime/timesynch.h"
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#include "sys/compower.h"
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#include "sys/pt.h"
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#include "sys/rtimer.h"
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#include "contiki-conf.h"
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@ -80,21 +82,23 @@ struct announcement_msg {
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"num" field in the struct. */
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#define ANNOUNCEMENT_MSG_HEADERLEN (sizeof (uint16_t))
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#define TYPE_STROBE 0
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#define TYPE_DATA 1
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#define TYPE_ANNOUNCEMENT 2
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#define TYPE_STROBE_ACK 3
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#define DISPATCH 0
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#define TYPE_STROBE 0x10
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/* #define TYPE_DATA 0x11 */
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#define TYPE_ANNOUNCEMENT 0x12
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#define TYPE_STROBE_ACK 0x13
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struct xmac_hdr {
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uint16_t type;
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rimeaddr_t sender;
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rimeaddr_t receiver;
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uint8_t dispatch;
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uint8_t type;
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};
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#define MAX_STROBE_SIZE 40
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#ifdef XMAC_CONF_ON_TIME
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#define DEFAULT_ON_TIME (XMAC_CONF_ON_TIME)
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#else
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#define DEFAULT_ON_TIME (RTIMER_ARCH_SECOND / 200)
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#define DEFAULT_ON_TIME (RTIMER_ARCH_SECOND / 160)
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#endif
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#ifdef XMAC_CONF_OFF_TIME
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@ -154,6 +158,7 @@ static const struct radio_driver *radio;
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#define PRINTDEBUG(...) printf(__VA_ARGS__)
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#else
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#undef LEDS_ON
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#undef LEDS_OFF
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@ -162,6 +167,7 @@ static const struct radio_driver *radio;
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#define LEDS_OFF(x)
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#define LEDS_TOGGLE(x)
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#define PRINTF(...)
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#define PRINTDEBUG(...)
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#endif
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#if XMAC_CONF_ANNOUNCEMENTS
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@ -251,7 +257,7 @@ powercycle(struct rtimer *t, void *ptr)
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#endif /* XMAC_CONF_COMPOWER */
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} else {
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waiting_for_packet++;
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if(waiting_for_packet >= 2) {
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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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@ -317,7 +323,7 @@ powercycle(struct rtimer *t, void *ptr)
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/*---------------------------------------------------------------------------*/
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#if XMAC_CONF_ANNOUNCEMENTS
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static int
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parse_announcements(rimeaddr_t *from)
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parse_announcements(const rimeaddr_t *from)
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{
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/* Parse incoming announcements */
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struct announcement_msg *adata = packetbuf_dataptr();
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@ -383,7 +389,7 @@ remove_encounter(void *encounter)
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}
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/*---------------------------------------------------------------------------*/
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static void
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register_encounter(rimeaddr_t *neighbor, rtimer_clock_t time)
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register_encounter(const rimeaddr_t *neighbor, rtimer_clock_t time)
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{
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struct encounter *e;
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@ -395,7 +401,7 @@ register_encounter(rimeaddr_t *neighbor, rtimer_clock_t time)
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break;
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}
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}
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/* No matchin encounter was found, so we allocate a new one. */
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/* No matching encounter was found, so we allocate a new one. */
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if(e == NULL) {
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e = memb_alloc(&encounter_memb);
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if(e == NULL) {
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@ -415,17 +421,16 @@ send_packet(void)
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{
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rtimer_clock_t t0;
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rtimer_clock_t t;
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rtimer_clock_t encounter_time;
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rtimer_clock_t encounter_time = 0;
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int strobes;
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struct xmac_hdr hdr;
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struct xmac_hdr *hdr;
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int got_strobe_ack = 0;
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struct {
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struct xmac_hdr hdr;
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struct announcement_msg announcement;
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} strobe;
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int len;
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uint8_t strobe[MAX_STROBE_SIZE];
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int strobe_len, len;
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int is_broadcast = 0;
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int is_reliable;
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struct encounter *e;
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struct queuebuf *packet;
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#if WITH_RANDOM_WAIT_BEFORE_SEND
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{
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@ -434,6 +439,50 @@ send_packet(void)
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}
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#endif /* WITH_RANDOM_WAIT_BEFORE_SEND */
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/* Create the X-MAC header for the data packet. */
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packetbuf_set_addr(PACKETBUF_ADDR_SENDER, &rimeaddr_node_addr);
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if(rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER), &rimeaddr_null)) {
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is_broadcast = 1;
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PRINTDEBUG("xmac: send broadcast\n");
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} else {
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#if UIP_CONF_IPV6
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PRINTDEBUG("xmac: send unicast to %02x%02x:%02x%02x:%02x%02x:%02x%02x\n",
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packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[0],
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packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[1],
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packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[2],
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packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[3],
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packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[4],
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packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[5],
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packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[6],
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packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[7]);
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#else
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PRINTDEBUG("xmac: send unicast to %u.%u\n",
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packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[0],
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packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[1]);
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#endif /* UIP_CONF_IPV6 */
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}
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is_reliable = packetbuf_attr(PACKETBUF_ATTR_RELIABLE) ||
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packetbuf_attr(PACKETBUF_ATTR_ERELIABLE);
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len = framer_get()->create();
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strobe_len = len + sizeof(struct xmac_hdr);
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if(len == 0 || strobe_len > sizeof(strobe)) {
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/* Failed to send */
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PRINTF("xmac: send failed, too large header\n");
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return 0;
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}
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memcpy(strobe, packetbuf_hdrptr(), len);
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strobe[len] = DISPATCH; /* dispatch */
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strobe[len + 1] = TYPE_STROBE; /* type */
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packetbuf_compact();
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packet = queuebuf_new_from_packetbuf();
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if(packet == NULL) {
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/* No buffer available */
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PRINTF("xmac: send failed, no queue buffer available (of %u)\n",
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QUEUEBUF_CONF_NUM);
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return 0;
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}
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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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@ -488,7 +537,6 @@ send_packet(void)
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receiver will already be awake. */
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while(RTIMER_CLOCK_LT(RTIMER_NOW(), expected));
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}
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#else /* WITH_ACK_OPTIMIZATION */
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/* Wait until the receiver is expected to be awake */
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while(RTIMER_CLOCK_LT(RTIMER_NOW(), expected));
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@ -497,22 +545,6 @@ send_packet(void)
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}
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#endif /* WITH_ENCOUNTER_OPTIMIZATION */
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/* Create the X-MAC header for the data packet. We cannot do this
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in-place in the packet buffer, because we cannot be sure of the
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alignment of the header in the packet buffer. */
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hdr.type = TYPE_DATA;
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rimeaddr_copy(&hdr.sender, &rimeaddr_node_addr);
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rimeaddr_copy(&hdr.receiver, packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
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if(rimeaddr_cmp(&hdr.receiver, &rimeaddr_null)) {
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is_broadcast = 1;
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}
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/* Copy the X-MAC header to the header portion of the packet
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buffer. */
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packetbuf_hdralloc(sizeof(struct xmac_hdr));
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memcpy(packetbuf_hdrptr(), &hdr, sizeof(struct xmac_hdr));
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packetbuf_compact();
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t0 = RTIMER_NOW();
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strobes = 0;
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@ -534,27 +566,45 @@ send_packet(void)
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t = RTIMER_NOW();
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strobe.hdr.type = TYPE_STROBE;
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rimeaddr_copy(&strobe.hdr.sender, &rimeaddr_node_addr);
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rimeaddr_copy(&strobe.hdr.receiver, packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
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/* Send the strobe packet. */
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radio->send((const uint8_t *)&strobe, sizeof(struct xmac_hdr));
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radio->send(strobe, strobe_len);
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while(got_strobe_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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if(!is_broadcast) {
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len = radio->read((uint8_t *)&strobe, sizeof(struct xmac_hdr));
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packetbuf_clear();
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len = radio->read(packetbuf_dataptr(), PACKETBUF_SIZE);
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if(len > 0) {
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if(rimeaddr_cmp(&strobe.hdr.sender, &rimeaddr_node_addr) &&
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rimeaddr_cmp(&strobe.hdr.receiver, &rimeaddr_node_addr)) {
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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_strobe_ack = 1;
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encounter_time = RTIMER_NOW();
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}
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}
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packetbuf_set_datalen(len);
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if(framer_get()->parse()) {
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hdr = packetbuf_dataptr();
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if(hdr->dispatch == DISPATCH && hdr->type == TYPE_STROBE_ACK) {
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if(rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
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&rimeaddr_node_addr)) {
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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_strobe_ack = 1;
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encounter_time = RTIMER_NOW();
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} else {
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PRINTDEBUG("xmac: strobe ack for someone else\n");
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}
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} else {
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/* TODO One of the nodes should back-off since several
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nodes are sending at once. If possible and if the
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packet is destined for this node: send a strobe ack
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if it is a strobe packet, queue the packet if it is a
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data packet? */
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PRINTDEBUG("xmac: ignored data %u\n", len);
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#if DEBUG
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/* collisions++;*/
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#endif /* DEBUG */
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}
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} else {
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PRINTF("xmac: send failed to parse %u\n", len);
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}
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}
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}
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}
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@ -587,6 +637,10 @@ send_packet(void)
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keep it on() for a while. */
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}
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/* restore the packet to send */
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queuebuf_to_packetbuf(packet);
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queuebuf_free(packet);
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/* Send the data packet. */
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if(is_broadcast || got_strobe_ack) {
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radio->send(packetbuf_hdrptr(), packetbuf_totlen());
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@ -594,7 +648,7 @@ send_packet(void)
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#if WITH_ENCOUNTER_OPTIMIZATION
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if(got_strobe_ack) {
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register_encounter(&hdr.receiver, encounter_time);
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register_encounter(packetbuf_addr(PACKETBUF_ADDR_RECEIVER), encounter_time);
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}
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#endif /* WITH_ENCOUNTER_OPTIMIZATION */
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watchdog_start();
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@ -667,74 +721,29 @@ read_packet(void)
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packetbuf_clear();
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len = radio->read(packetbuf_dataptr(), PACKETBUF_SIZE);
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if(len > 0) {
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packetbuf_set_datalen(len);
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if(len == 0) {
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return 0;
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}
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packetbuf_set_datalen(len);
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if(framer_get()->parse()) {
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hdr = packetbuf_dataptr();
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packetbuf_hdrreduce(sizeof(struct xmac_hdr));
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if(hdr->type == TYPE_STROBE) {
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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(hdr->dispatch != DISPATCH) {
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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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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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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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msg.type = TYPE_STROBE_ACK;
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rimeaddr_copy(&msg.receiver, &hdr->sender);
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rimeaddr_copy(&msg.sender, &hdr->sender);
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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 uint8_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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/* Check for annoucements in the strobe */
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/* if(packetbuf_datalen() > 0) {
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parse_announcements(&hdr->sender);
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}*/
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/* We are done processing the strobe and we therefore return
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to the caller. */
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return RIME_OK;
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} else if(hdr->type == TYPE_DATA) {
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someone_is_sending = 0;
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if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_node_addr) ||
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rimeaddr_cmp(&hdr->receiver, &rimeaddr_null)) {
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if(rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
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&rimeaddr_node_addr) ||
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rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
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&rimeaddr_null)) {
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/* This is a regular packet that is destined to us or to the
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broadcast address. */
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/* We have received the final packet, so we can go back to being
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asleep. */
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off();
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/* Set sender and receiver packet attributes */
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if(!rimeaddr_cmp(&hdr->receiver, &rimeaddr_null)) {
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packetbuf_set_addr(PACKETBUF_ADDR_RECEIVER, &hdr->receiver);
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}
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packetbuf_set_addr(PACKETBUF_ADDR_SENDER, &hdr->sender);
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#if XMAC_CONF_COMPOWER
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/* Accumulate the power consumption for the packet reception. */
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compower_accumulate(¤t_packet);
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@ -743,27 +752,81 @@ read_packet(void)
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keep track of the amount of energy spent on receiving the
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packet. */
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compower_attrconv(¤t_packet);
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/* Clear the accumulated power consumption so that it is ready
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for the next packet. */
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compower_clear(¤t_packet);
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#endif /* XMAC_CONF_COMPOWER */
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waiting_for_packet = 0;
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/* XXX should set timer to send queued packet later. */
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if(queued_packet != NULL) {
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queuebuf_free(queued_packet);
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queued_packet = NULL;
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}
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return packetbuf_totlen();
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PRINTDEBUG("xmac: data(%u)\n", packetbuf_datalen());
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return packetbuf_datalen();
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} else {
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PRINTDEBUG("xmac: data not for us\n");
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}
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} else if(hdr->type == TYPE_STROBE) {
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someone_is_sending = 2;
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if(rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
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&rimeaddr_node_addr)) {
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/* This is a strobe packet for us. */
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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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hdr->type = TYPE_STROBE_ACK;
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packetbuf_set_addr(PACKETBUF_ADDR_RECEIVER,
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packetbuf_addr(PACKETBUF_ADDR_SENDER));
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packetbuf_set_addr(PACKETBUF_ADDR_SENDER, &rimeaddr_node_addr);
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packetbuf_compact();
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if(framer_get()->create()) {
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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();
|
||||
radio->send(packetbuf_hdrptr(), packetbuf_totlen());
|
||||
PRINTDEBUG("xmac: send strobe ack %u\n", packetbuf_totlen());
|
||||
} else {
|
||||
PRINTF("xmac: failed to send strobe ack\n");
|
||||
}
|
||||
} else if(rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
|
||||
&rimeaddr_null)) {
|
||||
/* If the receiver address is null, the strobe is sent to
|
||||
prepare for an incoming broadcast packet. If this is the
|
||||
case, we turn on the radio and wait for the incoming
|
||||
broadcast packet. */
|
||||
waiting_for_packet = 1;
|
||||
on();
|
||||
} else {
|
||||
PRINTDEBUG("xmac: strobe not for us\n");
|
||||
}
|
||||
|
||||
/* We are done processing the strobe and we therefore return
|
||||
to the caller. */
|
||||
return RIME_OK;
|
||||
#if XMAC_CONF_ANNOUNCEMENTS
|
||||
} else if(hdr->type == TYPE_ANNOUNCEMENT) {
|
||||
parse_announcements(&hdr->sender);
|
||||
packetbuf_hdrreduce(sizeof(struct xmac_hdr));
|
||||
parse_announcements(packetbuf_addr(PACKETBUF_ADDR_SENDER));
|
||||
#endif /* XMAC_CONF_ANNOUNCEMENTS */
|
||||
} else if(hdr->type == TYPE_STROBE_ACK) {
|
||||
PRINTDEBUG("xmac: stray strobe ack\n");
|
||||
} else {
|
||||
PRINTF("xmac: unknown type %u (%u/%u)\n", hdr->type,
|
||||
packetbuf_datalen(), len);
|
||||
}
|
||||
} else {
|
||||
PRINTF("xmac: failed to parse (%u)\n", packetbuf_totlen());
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
@ -777,20 +840,22 @@ send_announcement(void *ptr)
|
||||
|
||||
/* Set up the probe header. */
|
||||
packetbuf_clear();
|
||||
packetbuf_set_datalen(sizeof(struct xmac_hdr));
|
||||
hdr = packetbuf_dataptr();
|
||||
hdr->type = TYPE_ANNOUNCEMENT;
|
||||
rimeaddr_copy(&hdr->sender, &rimeaddr_node_addr);
|
||||
rimeaddr_copy(&hdr->receiver, &rimeaddr_null);
|
||||
|
||||
announcement_len = format_announcement((char *)hdr +
|
||||
sizeof(struct xmac_hdr));
|
||||
|
||||
if(announcement_len > 0) {
|
||||
packetbuf_set_datalen(sizeof(struct xmac_hdr) + announcement_len);
|
||||
hdr->dispatch = DISPATCH;
|
||||
hdr->type = TYPE_ANNOUNCEMENT;
|
||||
|
||||
packetbuf_set_addr(PACKETBUF_ADDR_SENDER, &rimeaddr_node_addr);
|
||||
packetbuf_set_addr(PACKETBUF_ADDR_RECEIVER, &rimeaddr_null);
|
||||
packetbuf_set_attr(PACKETBUF_ATTR_RADIO_TXPOWER, announcement_radio_txpower);
|
||||
radio->send(packetbuf_hdrptr(), packetbuf_totlen());
|
||||
if(framer_get()->create()) {
|
||||
radio->send(packetbuf_hdrptr(), packetbuf_totlen());
|
||||
}
|
||||
}
|
||||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
|
||||
Loading…
Reference in New Issue
Block a user