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* Changed implementation for dealing with retransmissions to be

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strictly event driven. The old implementation was rather process
  like and the new one is still implemented as a process.
This commit is contained in:
bg- 2007-05-31 10:15:57 +00:00
parent f528ff9fe2
commit 81b684414d
1 changed files with 42 additions and 50 deletions
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92
core/dev/cc2420.c
View file

@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* @(#)$Id: cc2420.c,v 1.17 2007/05/21 14:24:51 bg- Exp $
* @(#)$Id: cc2420.c,v 1.18 2007/05/31 10:15:57 bg- Exp $
*/
/*
* This code is almost device independent and should be easy to port.
@ -196,7 +196,7 @@ cc2420_send(struct hdr_802_15 *hdr, u8_t hdr_len,
const u8_t *payload, u8_t payload_len)
{
u8_t spiStatusByte;
int s, ret;
int s;
/* struct hdr_802_15::len shall *not* be counted, thus the -1.
* 2 == sizeof(footer).
@ -231,14 +231,8 @@ cc2420_send(struct hdr_802_15 *hdr, u8_t hdr_len,
FASTSPI_WRITE_FIFO(payload, payload_len);
splx(s);
ret = cc2420_resend(); /* Send stuff from FIFO. */
if (hdr->dst == 0xffff && ret == UIP_FW_OK) {
return ret;
}
process_post(&cc2420_retransmit_process,
PROCESS_EVENT_MSG,
(void *)(unsigned)last_used_seq);
/* Send stuff from FIFO now! */
process_post_synch(&cc2420_retransmit_process, PROCESS_EVENT_MSG, NULL);
return UIP_FW_OK;
}
@ -510,52 +504,50 @@ unsigned neigbour_find(u16_t mac);
PROCESS_THREAD(cc2420_retransmit_process, ev, data)
{
static u8_t seq, n;
static char n;
static struct etimer etimer;
PROCESS_BEGIN();
switch (ev) {
default:
case PROCESS_EVENT_INIT:
return PT_WAITING;
while (1) {
PROCESS_WAIT_UNTIL(ev == PROCESS_EVENT_MSG);
seq = (unsigned)data;
case PROCESS_EVENT_EXIT:
return PT_ENDED;
n = 0;
do {
etimer_set(&etimer, RETRANSMIT_TIMEOUT);
PROCESS_WAIT_UNTIL(etimer_expired(&etimer) || ev == PROCESS_EVENT_POLL);
if (ev == PROCESS_EVENT_POLL) {
etimer_stop(&etimer);
break;
} else if (seq != last_used_seq)
break; /* Transmitting different packet. */
else if (last_dst == 0xffff) {
n++;
if (cc2420_resend() == UIP_FW_OK) {
PRINTF("REBCAST %d\n", n);
etimer_stop(&etimer);
break;
}
} else if (n < MAX_RETRANSMISSIONS) {
if (cc2420_resend() == UIP_FW_OK) {
n++;
PRINTF("RETRANS %d to %d.%d\n", n, last_dst & 0xff, last_dst >> 8);
}
} else {
break;
}
} while (1);
case PROCESS_EVENT_POLL: /* Cancel future retransmissions. */
etimer_stop(&etimer);
neigbour_update(last_dst, n);
#if 0
#define CORRELATION_2_X(c) (((c) < 48) ? 0 : ((c) - 48))
PRINTF("%04x %2d %2d %2u %u\n",
last_dst, n,
RSSI_2_ED(cc2420_last_rssi),
CORRELATION_2_X(cc2420_last_correlation),
clock_time());
#endif
}
return PT_WAITING;
PROCESS_END();
case PROCESS_EVENT_MSG: /* Send new packet. */
n = -1;
/* FALLTHROUGH */
case PROCESS_EVENT_TIMER:
if (last_dst == 0xffff) {
n++;
if (cc2420_resend() == UIP_FW_OK) {
PRINTF("REBCAST %d\n", n);
return PT_WAITING; /* Final transmission attempt. */
}
} else {
if (cc2420_resend() == UIP_FW_OK) {
n++;
PRINTF("RETRANS %d to %d.%d\n", n, last_dst & 0xff, last_dst >> 8);
}
if (n == MAX_RETRANSMISSIONS) {
neigbour_update(last_dst, n);
return PT_WAITING; /* Final transmission attempt. */
}
}
/*
* Schedule retransmission.
*/
etimer_set(&etimer, RETRANSMIT_TIMEOUT);
return PT_WAITING;
}
/* NOTREACHED */
}
/*