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Added configurable support for 802.15.4 autoack

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This commit is contained in:
nifi 2010-05-26 14:12:33 +00:00
parent 320fa820ca
commit ac9b862cd0
1 changed files with 106 additions and 5 deletions
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107
core/net/mac/nullrdc-framer.c
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@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: nullrdc-framer.c,v 1.1 2010/03/01 13:30:23 nifi Exp $
* $Id: nullrdc-framer.c,v 1.2 2010/05/26 14:12:33 nifi Exp $
*/
/**
@ -42,6 +42,8 @@
#include "net/mac/nullrdc-framer.h"
#include "net/rime/packetbuf.h"
#include "net/netstack.h"
#include "sys/rtimer.h"
#include "dev/watchdog.h"
#define DEBUG 0
#if DEBUG
@ -51,21 +53,114 @@
#define PRINTF(...)
#endif
#ifndef NULLRDC_FRAMER_802154_AUTOACK
#ifdef NULLRDC_FRAMER_CONF_802154_AUTOACK
#define NULLRDC_FRAMER_802154_AUTOACK NULLRDC_FRAMER_CONF_802154_AUTOACK
#else
#define NULLRDC_FRAMER_802154_AUTOACK 0
#endif /* NULLRDC_FRAMER_CONF_802154_AUTOACK */
#endif /* NULLRDC_FRAMER_802154_AUTOACK */
#define ACK_WAIT_TIME RTIMER_SECOND / 2500
#define AFTER_ACK_DETECTED_WAIT_TIME RTIMER_SECOND / 1500
#define ACK_LEN 3
/*---------------------------------------------------------------------------*/
static void
send_packet(mac_callback_t sent, void *ptr)
{
int ret;
packetbuf_set_addr(PACKETBUF_ADDR_SENDER, &rimeaddr_node_addr);
#if NULLRDC_FRAMER_802154_AUTOACK
packetbuf_set_attr(PACKETBUF_ATTR_MAC_ACK, 1);
#endif /* NULLRDC_FRAMER_802154_AUTOACK */
if(NETSTACK_FRAMER.create() == 0) {
/* Failed to allocate space for headers */
PRINTF("nullrdc_framer: send failed, too large header\n");
ret = MAC_TX_ERR_FATAL;
} else if(NETSTACK_RADIO.send(packetbuf_hdrptr(), packetbuf_totlen())
== RADIO_TX_OK) {
} else {
#if NULLRDC_FRAMER_802154_AUTOACK
int is_broadcast;
uint8_t dsn;
dsn = ((uint8_t *)packetbuf_hdrptr())[2] & 0xff;
NETSTACK_RADIO.prepare(packetbuf_hdrptr(), packetbuf_totlen());
is_broadcast = rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
&rimeaddr_null);
if(NETSTACK_RADIO.receiving_packet() ||
(!is_broadcast && NETSTACK_RADIO.pending_packet())) {
/* Currently receiving a packet over air or the radio has
already received a packet that needs to be read before
sending with auto ack. */
ret = MAC_TX_COLLISION;
} else {
switch(NETSTACK_RADIO.transmit(packetbuf_totlen())) {
case RADIO_TX_OK:
if(is_broadcast) {
ret = MAC_TX_OK;
} else {
rtimer_clock_t wt;
/* Check for ack */
wt = RTIMER_NOW();
watchdog_periodic();
while(RTIMER_CLOCK_LT(RTIMER_NOW(), wt + ACK_WAIT_TIME));
ret = MAC_TX_NOACK;
if(NETSTACK_RADIO.receiving_packet() ||
NETSTACK_RADIO.pending_packet() ||
NETSTACK_RADIO.channel_clear() == 0) {
int len;
uint8_t ackbuf[ACK_LEN];
wt = RTIMER_NOW();
watchdog_periodic();
while(RTIMER_CLOCK_LT(RTIMER_NOW(),
wt + AFTER_ACK_DETECTED_WAIT_TIME));
if(NETSTACK_RADIO.pending_packet()) {
len = NETSTACK_RADIO.read(ackbuf, ACK_LEN);
if(len == ACK_LEN && ackbuf[2] == dsn) {
/* Ack received */
ret = MAC_TX_OK;
} else {
/* Not an ack or ack not for us: collision */
ret = MAC_TX_COLLISION;
}
}
}
}
break;
case RADIO_TX_COLLISION:
ret = MAC_TX_COLLISION;
break;
default:
ret = MAC_TX_ERR;
break;
}
}
#else /* ! NULLRDC_FRAMER_802154_AUTOACK */
switch(NETSTACK_RADIO.send(packetbuf_hdrptr(), packetbuf_totlen())) {
case RADIO_TX_OK:
ret = MAC_TX_OK;
break;
case RADIO_TX_COLLISION:
ret = MAC_TX_COLLISION;
break;
default:
ret = MAC_TX_ERR;
break;
}
#endif /* ! NULLRDC_FRAMER_802154_AUTOACK */
}
mac_call_sent_callback(sent, ptr, ret, 1);
}
@ -73,6 +168,12 @@ send_packet(mac_callback_t sent, void *ptr)
static void
packet_input(void)
{
#if NULLRDC_FRAMER_802154_AUTOACK
if(packetbuf_datalen() == ACK_LEN) {
/* Ignore ack packets */
/* PRINTF("nullrdc_framer: ignored ack\n"); */
} else
#endif /* NULLRDC_FRAMER_802154_AUTOACK */
if(NETSTACK_FRAMER.parse() == 0) {
PRINTF("nullrdc_framer: failed to parse %u\n", packetbuf_datalen());
} else {