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Added MAC-layer announcement beacons to X-MAC. Configuratble through XMAC_CONF_ANNOUNCEMENTS
This commit is contained in:
adamdunkels
parent
883d10e136
commit
e4b1ff461e
@ -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 1.22 2009/02/07 18:45:50 adamdunkels Exp $
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* $Id: xmac.c,v 1.23 2009/02/14 20:35:03 adamdunkels Exp $
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*/
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/**
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@ -47,7 +47,6 @@
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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 "lib/bb.h"*/
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#include "sys/timetable.h"
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@ -62,7 +61,31 @@
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#define WITH_TIMESYNCH 0
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#define WITH_QUEUE 0
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struct announcement_data {
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uint16_t id;
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uint16_t value;
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};
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/* The maximum number of announcements in a single announcement
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message - may need to be increased in the future. */
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#define ANNOUNCEMENT_MAX 10
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/* The length of the header of the announcement message, i.e., the
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"num" field in the struct. */
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#define ANNOUNCEMENT_MSG_HEADERLEN 2
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/* The structure of the announcement messages. */
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struct announcement_msg {
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uint16_t num;
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struct announcement_data data[ANNOUNCEMENT_MAX];
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};
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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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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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};
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@ -79,6 +102,13 @@ struct xmac_hdr {
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#define DEFAULT_OFF_TIME (RTIMER_ARCH_SECOND / 2 - DEFAULT_ON_TIME)
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#endif
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/* The cycle time for announcements. */
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#define ANNOUNCEMENT_PERIOD 4 * CLOCK_SECOND
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/* The time before sending an announcement within one announcement
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cycle. */
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#define ANNOUNCEMENT_TIME (rand() % (ANNOUNCEMENT_PERIOD))
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#define DEFAULT_STROBE_WAIT_TIME (7 * DEFAULT_ON_TIME / 8)
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struct xmac_config xmac_config = {
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@ -129,6 +159,15 @@ static const struct radio_driver *radio;
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#define PRINTF(...)
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#endif
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#if XMAC_CONF_ANNOUNCEMENTS
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/* Timers for keeping track of when to send announcements. */
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static struct ctimer announcement_cycle_ctimer, announcement_ctimer;
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#endif /* XMAC_CONF_ANNOUNCEMENTS */
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/* Flag that is used to keep track of whether or not we are listening
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for announcements from neighbors. */
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static uint8_t is_listening;
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static void (* receiver_callback)(const struct mac_driver *);
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#if WITH_TIMETABLE
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@ -159,7 +198,7 @@ on(void)
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static void
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off(void)
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{
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if(xmac_is_on && radio_is_on != 0) {
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if(xmac_is_on && radio_is_on != 0 && is_listening == 0) {
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radio_is_on = 0;
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radio->off();
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#if WITH_TIMETABLE
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@ -250,6 +289,54 @@ powercycle(struct rtimer *t, void *ptr)
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PT_END(&pt);
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}
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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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{
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/* Parse incoming announcements */
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struct announcement_msg *adata = rimebuf_dataptr();
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int i;
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PRINTF("%d.%d: probe from %d.%d with %d announcements\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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hdr->sender.u8[0], hdr->sender.u8[1], adata->num);
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for(i = 0; i < adata->num; ++i) {
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PRINTF("%d.%d: announcement %d: %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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adata->data[i].id,
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adata->data[i].value);
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announcement_heard(from,
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adata->data[i].id,
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adata->data[i].value);
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}
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return i;
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}
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/*---------------------------------------------------------------------------*/
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static int
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format_announcement(char *hdr)
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{
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struct announcement_msg *adata;
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struct announcement *a;
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/* Construct the announcements */
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adata = (struct announcement_msg *)hdr;
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adata->num = 0;
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for(a = announcement_list();
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a != NULL && adata->num < ANNOUNCEMENT_MAX;
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a = a->next) {
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adata->data[adata->num].id = a->id;
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adata->data[adata->num].value = a->value;
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adata->num++;
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}
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return ANNOUNCEMENT_MSG_HEADERLEN +
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sizeof(struct announcement_data) * adata->num;
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}
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#endif /* XMAC_CONF_ANNOUNCEMENTS */
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/*---------------------------------------------------------------------------*/
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static int
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send_packet(void)
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{
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@ -258,7 +345,10 @@ send_packet(void)
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int strobes;
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struct xmac_hdr *hdr;
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int got_ack = 0;
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struct xmac_hdr msg;
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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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int is_broadcast = 0;
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@ -272,7 +362,7 @@ send_packet(void)
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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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len = radio->read(&strobe.hdr, sizeof(strobe.hdr));
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if(len > 0) {
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someone_is_sending = 1;
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}
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@ -296,6 +386,7 @@ send_packet(void)
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rimebuf_hdralloc(sizeof(struct xmac_hdr));
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hdr = rimebuf_hdrptr();
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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, rimebuf_addr(RIMEBUF_ADDR_RECEIVER));
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if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_null)) {
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@ -325,35 +416,30 @@ send_packet(void)
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strobes++) {
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t = RTIMER_NOW();
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rimeaddr_copy(&msg.sender, &rimeaddr_node_addr);
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rimeaddr_copy(&msg.receiver, rimebuf_addr(RIMEBUF_ADDR_RECEIVER));
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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, rimebuf_addr(RIMEBUF_ADDR_RECEIVER));
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#if WITH_TIMETABLE
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if(rimeaddr_cmp(&msg.receiver, &rimeaddr_null)) {
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if(rimeaddr_cmp(&strobe.hdr.receiver, &rimeaddr_null)) {
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TIMETABLE_TIMESTAMP(xmac_timetable, "send broadcast strobe");
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} else {
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TIMETABLE_TIMESTAMP(xmac_timetable, "send strobe");
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}
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#endif
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if(0/*is_broadcast*/) {
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/* If we are sending a broadcast, we don't send strobes, we
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simply send the data packet repetedly */
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radio->send(rimebuf_hdrptr(), rimebuf_totlen());
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} else {
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/* Send the strobe packet. */
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radio->send((const uint8_t *)&msg, sizeof(struct xmac_hdr));
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}
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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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CPRINTF("+");
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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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len = radio->read((uint8_t *)&msg, sizeof(struct xmac_hdr));
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len = radio->read((uint8_t *)&strobe, sizeof(struct xmac_hdr));
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if(len > 0) {
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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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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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#if WITH_TIMETABLE
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TIMETABLE_TIMESTAMP(xmac_timetable, "send ack received");
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#endif
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@ -469,7 +555,7 @@ read_packet(void)
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rimebuf_hdrreduce(sizeof(struct xmac_hdr));
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if(rimebuf_totlen() == 0) {
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if(hdr->type == TYPE_STROBE) {
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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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@ -510,10 +596,15 @@ read_packet(void)
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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(rimebuf_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 {
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} else if(hdr->type == TYPE_DATA) {
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CPRINTF("-");
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someone_is_sending = 0;
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if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_node_addr) ||
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@ -537,11 +628,60 @@ read_packet(void)
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return rimebuf_totlen();
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}
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#if XMAC_CONF_ANNOUNCEMENTS
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} else if(hdr->type == TYPE_ANNOUNCEMENT) {
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parse_announcements(&hdr->sender);
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#endif /* XMAC_CONF_ANNOUNCEMENTS */
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}
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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#if XMAC_CONF_ANNOUNCEMENTS
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static void
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send_announcement(void *ptr)
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{
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struct xmac_hdr *hdr;
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struct announcement_msg *adata;
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struct announcement *a;
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int announcement_len;
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/* Set up the probe header. */
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rimebuf_clear();
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rimebuf_set_datalen(sizeof(struct xmac_hdr));
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hdr = rimebuf_dataptr();
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hdr->type = TYPE_ANNOUNCEMENT;
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rimeaddr_copy(&hdr->sender, &rimeaddr_node_addr);
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rimeaddr_copy(&hdr->receiver, &rimeaddr_null);
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announcement_len = format_announcement((char *)hdr +
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sizeof(struct xmac_hdr));
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rimebuf_set_datalen(sizeof(struct xmac_hdr) + announcement_len);
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/* PRINTF("Sending probe\n");*/
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radio->send(rimebuf_hdrptr(), rimebuf_totlen());
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}
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/*---------------------------------------------------------------------------*/
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static void
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cycle_announcement(void *ptr)
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{
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ctimer_set(&announcement_ctimer, ANNOUNCEMENT_TIME,
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send_announcement, NULL);
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ctimer_set(&announcement_cycle_ctimer, ANNOUNCEMENT_PERIOD,
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cycle_announcement, NULL);
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if(is_listening > 0) {
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is_listening--;
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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listen_callback(int periods)
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{
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is_listening = periods + 1;
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}
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#endif /* XMAC_CONF_ANNOUNCEMENTS */
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/*---------------------------------------------------------------------------*/
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const struct mac_driver *
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xmac_init(const struct radio_driver *d)
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{
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@ -563,6 +703,12 @@ xmac_init(const struct radio_driver *d)
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BB_SET(XMAC_STROBES, 0);
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BB_SET(XMAC_SEND_WITH_ACK, 0);
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BB_SET(XMAC_SEND_WITH_NOACK, 0);
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#if XMAC_CONF_ANNOUNCEMENTS
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announcement_register_listen_callback(listen_callback);
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ctimer_set(&announcement_cycle_ctimer, ANNOUNCEMENT_TIME,
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cycle_announcement, NULL);
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#endif /* XMAC_CONF_ANNOUNCEMENTS */
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return &xmac_driver;
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}
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/*---------------------------------------------------------------------------*/
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