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Fixed timestamping to support the simple implicit network time synchronization mechanism

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This commit is contained in:
adamdunkels 2007-12-16 14:30:36 +00:00
parent 8bf9a08a70
commit c948c97b4f
2 changed files with 76 additions and 29 deletions
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95
core/dev/simple-cc2420.c
View file

@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* @(#)$Id: simple-cc2420.c,v 1.16 2007/12/05 13:21:05 adamdunkels Exp $
* @(#)$Id: simple-cc2420.c,v 1.17 2007/12/16 14:30:36 adamdunkels Exp $
*/
/*
* This code is almost device independent and should be easy to port.
@ -51,6 +51,22 @@
#include "net/rime/rimestats.h"
#define FOOTER_LEN 2
#if SIMPLE_CC2420_CONF_TIMESTAMPS
#include "sys/timesynch.h"
#define TIMESTAMP_LEN 3
#else /* SIMPLE_CC2420_CONF_TIMESTAMPS */
#define TIMESTAMP_LEN 0
#endif /* SIMPLE_CC2420_CONF_TIMESTAMPS */
struct timestamp {
uint16_t time;
uint8_t authority_level;
};
#define FOOTER1_CRC_OK 0x80
#define FOOTER1_CORRELATION 0x7f
@ -63,6 +79,12 @@
void simple_cc2420_arch_init(void);
/* XXX hack: these will be made as Chameleon packet attributes */
rtimer_clock_t simple_cc2420_time_of_arrival, simple_cc2420_time_of_departure;
rtimer_clock_t simple_cc2420_time_for_transmission;
int simple_cc2420_authority_level_of_sender;
/*---------------------------------------------------------------------------*/
PROCESS(simple_cc2420_process, "CC2420 driver");
/*---------------------------------------------------------------------------*/
@ -235,8 +257,10 @@ simple_cc2420_init(void)
int
simple_cc2420_send(const void *payload, unsigned short payload_len)
{
u8_t spiStatusByte;
uint8_t spiStatusByte;
int i;
uint8_t total_len;
struct timestamp timestamp;
/* This code uses the CC2420 CCA (Clear Channel Assessment) to
* implement Carrier Sense Multiple Access with Collision Avoidance
@ -261,19 +285,16 @@ simple_cc2420_send(const void *payload, unsigned short payload_len)
/* Write packet to TX FIFO. */
strobe(CC2420_SFLUSHTX);
{
u8_t total_len = /*2 +*/ payload_len + 2; /* 2 bytes time stamp,
2 bytes footer. */
FASTSPI_WRITE_FIFO(&total_len, 1);
}
total_len = payload_len + TIMESTAMP_LEN + FOOTER_LEN;
FASTSPI_WRITE_FIFO(&total_len, 1);
FASTSPI_WRITE_FIFO(payload, payload_len);
/* {
rtimer_clock_t t;
t = rtimer_arch_now();
FASTSPI_WRITE_FIFO(&t, 2);
}*/
#if SIMPLE_CC2420_CONF_TIMESTAMPS
timestamp.authority_level = timesynch_authority_level();
timestamp.time = timesynch_time();
FASTSPI_WRITE_FIFO(&timestamp, TIMESTAMP_LEN);
#endif /* SIMPLE_CC2420_CONF_TIMESTAMPS */
if(FIFOP_IS_1 && !FIFO_IS_1) {
/* RXFIFO overflow, send on retransmit. */
@ -304,6 +325,9 @@ simple_cc2420_send(const void *payload, unsigned short payload_len)
do {
spiStatusByte = status();
} while(spiStatusByte & BV(CC2420_TX_ACTIVE));
#if SIMPLE_CC2420_CONF_TIMESTAMPS
simple_cc2420_time_for_transmission = timesynch_time() - timestamp.time;
#endif /* SIMPLE_CC2420_CONF_TIMESTAMPS */
ENERGEST_OFF(ENERGEST_TYPE_TRANSMIT);
ENERGEST_ON(ENERGEST_TYPE_LISTEN);
@ -407,10 +431,12 @@ simple_cc2420_set_chan_pan_addr(unsigned channel, /* 11 - 26 */
* interrupt priority rather than poll priority.
*/
static volatile rtimer_clock_t interrupt_time;
static volatile int interrupt_time_set;
int
simple_cc2420_interrupt(void)
{
interrupt_time = rtimer_arch_now();
interrupt_time = timesynch_time();
interrupt_time_set = 1;
CLEAR_FIFOP_INT();
process_poll(&simple_cc2420_process);
@ -444,11 +470,21 @@ simple_cc2420_read(void *buf, unsigned short bufsize)
{
u8_t footer[2];
int len;
struct timestamp t;
if(!packet_seen) {
return 0;
}
if(interrupt_time_set) {
#if SIMPLE_CC2420_CONF_TIMESTAMPS
simple_cc2420_time_of_arrival = interrupt_time;
#endif /* SIMPLE_CC2420_CONF_TIMESTAMPS */
interrupt_time_set = 0;
} else {
simple_cc2420_time_of_arrival = 0;
}
simple_cc2420_time_of_departure = 0;
GET_LOCK();
FASTSPI_READ_FIFO_BYTE(len);
@ -466,24 +502,27 @@ simple_cc2420_read(void *buf, unsigned short bufsize)
if(len > 0) {
/* Read payload and two bytes of footer */
PRINTF("simple_cc2420_read: len %d\n", len);
if(len < 2) {
if(len < FOOTER_LEN + TIMESTAMP_LEN) {
FASTSPI_READ_FIFO_GARBAGE(len);
RIMESTATS_ADD(tooshort);
} else if(len - 2 > bufsize) {
} else if(len - FOOTER_LEN - TIMESTAMP_LEN > bufsize) {
PRINTF("simple_cc2420_read too big len=%d bufsize %d\n", len, bufsize);
// FASTSPI_READ_FIFO_GARBAGE(2);
FASTSPI_READ_FIFO_NO_WAIT(buf, bufsize);
FASTSPI_READ_FIFO_GARBAGE(len - bufsize - 2);
FASTSPI_READ_FIFO_NO_WAIT(footer, 2);
FASTSPI_READ_FIFO_GARBAGE(len - bufsize - FOOTER_LEN - TIMESTAMP_LEN);
#if SIMPLE_CC2420_CONF_TIMESTAMPS
FASTSPI_READ_FIFO_NO_WAIT(&t, TIMESTAMP_LEN); /* Time stamp */
#endif /* SIMPLE_CC2420_CONF_TIMESTAMPS */
FASTSPI_READ_FIFO_NO_WAIT(footer, FOOTER_LEN);
// len = bufsize - 2; /* We eventually return len - 2 */
len = 2;
len = TIMESTAMP_LEN + FOOTER_LEN;
RIMESTATS_ADD(toolong);
} else {
// rtimer_clock_t t;
// FASTSPI_READ_FIFO_NO_WAIT(&t, 2); /* Time stamp */
FASTSPI_READ_FIFO_NO_WAIT(buf, len - 2);
FASTSPI_READ_FIFO_NO_WAIT(buf, len - FOOTER_LEN - TIMESTAMP_LEN);
/* PRINTF("simple_cc2420_read: data\n");*/
FASTSPI_READ_FIFO_NO_WAIT(footer, 2);
FASTSPI_READ_FIFO_NO_WAIT(&t, TIMESTAMP_LEN); /* Time stamp */
FASTSPI_READ_FIFO_NO_WAIT(footer, FOOTER_LEN);
/* PRINTF("simple_cc2420_read: footer\n");*/
if(footer[1] & FOOTER1_CRC_OK) {
simple_cc2420_last_rssi = footer[0];
@ -491,10 +530,12 @@ simple_cc2420_read(void *buf, unsigned short bufsize)
RIMESTATS_ADD(llrx);
} else {
RIMESTATS_ADD(badcrc);
len = 2;
len = TIMESTAMP_LEN + FOOTER_LEN;
}
// PRINTF("Time 0x%02x\n", t);
#if SIMPLE_CC2420_CONF_TIMESTAMPS
simple_cc2420_time_of_departure = t.time;
simple_cc2420_authority_level_of_sender = t.authority_level;
#endif /* SIMPLE_CC2420_CONF_TIMESTAMPS */
}
}
@ -520,11 +561,11 @@ simple_cc2420_read(void *buf, unsigned short bufsize)
RELEASE_LOCK();
if(len < 2) {
if(len < FOOTER_LEN + TIMESTAMP_LEN) {
return 0;
}
return len - 2; /* Remove two bytes for the footer, two bytes for time stamp. */
return len - FOOTER_LEN - TIMESTAMP_LEN;
}
/*---------------------------------------------------------------------------*/
void

8
core/dev/simple-cc2420.h
View file

@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: simple-cc2420.h,v 1.5 2007/12/05 13:21:05 adamdunkels Exp $
* $Id: simple-cc2420.h,v 1.6 2007/12/16 14:30:36 adamdunkels Exp $
*/
/**
@ -73,4 +73,10 @@ void simple_cc2420_set_txpower(u8_t power);
*/
int simple_cc2420_interrupt(void);
/* XXX hack: these will be made as Chameleon packet attributes */
extern rtimer_clock_t simple_cc2420_time_of_arrival,
simple_cc2420_time_of_departure;
extern rtimer_clock_t simple_cc2420_time_for_transmission;
extern int simple_cc2420_authority_level_of_sender;
#endif /* __SIMPLE_CC2420_H__ */