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Added option to wait randomly before sending a packet. A few code cleanups. Avoid switching radio off when sending a packet with end-to-end acks, because an ACK may arrive shortly after the transmission.

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This commit is contained in:
adamdunkels 2009-04-28 14:00:53 +00:00
parent fdd05f5c71
commit 81ef83b856
1 changed files with 35 additions and 21 deletions
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42
core/net/mac/xmac.c
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@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: xmac.c,v 1.30 2009/03/23 21:06:26 adamdunkels Exp $
* $Id: xmac.c,v 1.31 2009/04/28 14:00:53 adamdunkels Exp $
*/
/**
@ -55,15 +55,12 @@
#include <string.h>
#if CHAMELEON
#include "net/chameleon/packattr.h"
#endif
#define WITH_TIMETABLE 0
#define WITH_CHANNEL_CHECK 0 /* Seems to work badly when enabled */
#define WITH_TIMESYNCH 0
#define WITH_QUEUE 0
#define WITH_ACK_OPTIMIZATION 1
#define WITH_RANDOM_WAIT_BEFORE_SEND 0
struct announcement_data {
uint16_t id;
@ -74,19 +71,20 @@ struct announcement_data {
message - may need to be increased in the future. */
#define ANNOUNCEMENT_MAX 10
/* The length of the header of the announcement message, i.e., the
"num" field in the struct. */
#define ANNOUNCEMENT_MSG_HEADERLEN 2
/* The structure of the announcement messages. */
struct announcement_msg {
uint16_t num;
struct announcement_data data[ANNOUNCEMENT_MAX];
};
/* The length of the header of the announcement message, i.e., the
"num" field in the struct. */
#define ANNOUNCEMENT_MSG_HEADERLEN (sizeof (uint16_t))
#define TYPE_STROBE 0
#define TYPE_DATA 1
#define TYPE_ANNOUNCEMENT 2
#define TYPE_STROBE_ACK 3
struct xmac_hdr {
uint16_t type;
@ -251,7 +249,9 @@ powercycle(struct rtimer *t, void *ptr)
#if WITH_TIMETABLE
TIMETABLE_TIMESTAMP(xmac_timetable, "off waiting");
#endif
if(we_are_sending == 0) {
off();
}
#if XMAC_CONF_COMPOWER
compower_accumulate(&compower_idle_activity);
#endif /* XMAC_CONF_COMPOWER */
@ -309,15 +309,19 @@ parse_announcements(rimeaddr_t *from)
struct announcement_msg *adata = packetbuf_dataptr();
int i;
PRINTF("%d.%d: probe from %d.%d with %d announcements\n",
/* printf("%d.%d: probe from %d.%d with %d announcements\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
hdr->sender.u8[0], hdr->sender.u8[1], adata->num);
from->u8[0], from->u8[1], adata->num);*/
/* for(i = 0; i < packetbuf_datalen(); ++i) {
printf("%02x ", ((uint8_t *)packetbuf_dataptr())[i]);
}
printf("\n");*/
for(i = 0; i < adata->num; ++i) {
PRINTF("%d.%d: announcement %d: %d\n",
/* printf("%d.%d: announcement %d: %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
adata->data[i].id,
adata->data[i].value);
adata->data[i].value);*/
announcement_heard(from,
adata->data[i].id,
@ -368,6 +372,13 @@ send_packet(void)
int len;
int is_broadcast = 0;
#if WITH_RANDOM_WAIT_BEFORE_SEND
{
rtimer_clock_t t = RTIMER_NOW() + (random_rand() % (xmac_config.on_time * 4));
while(RTIMER_CLOCK_LT(RTIMER_NOW(), t));
}
#endif /* WITH_RANDOM_WAIT_BEFORE_SEND */
#if WITH_TIMETABLE
TIMETABLE_TIMESTAMP(xmac_timetable, "send");
#endif
@ -483,7 +494,8 @@ send_packet(void)
/* If we have received the strobe ACK, and we are sending a packet
that will need an upper layer ACK (as signified by the
PACKETBUF_ATTR_RELIABLE packet attribute), we keep the radio on. */
if(got_strobe_ack && packetbuf_attr(PACKETBUF_ATTR_RELIABLE)) {
if(got_strobe_ack && (packetbuf_attr(PACKETBUF_ATTR_RELIABLE) ||
packetbuf_attr(PACKETBUF_ATTR_ERELIABLE))) {
#if WITH_TIMETABLE
TIMETABLE_TIMESTAMP(xmac_timetable, "send got ack");
#endif
@ -612,6 +624,7 @@ read_packet(void)
#if WITH_TIMETABLE
TIMETABLE_TIMESTAMP(xmac_timetable, "read send ack");
#endif
msg.type = TYPE_STROBE_ACK;
rimeaddr_copy(&msg.receiver, &hdr->sender);
rimeaddr_copy(&msg.sender, &hdr->sender);
CPRINTF("!");
@ -721,6 +734,7 @@ cycle_announcement(void *ptr)
cycle_announcement, NULL);
if(is_listening > 0) {
is_listening--;
/* printf("is_listening %d\n", is_listening);*/
}
}
/*---------------------------------------------------------------------------*/