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Moved a much code as possible away from interrupt handler; main thread code now do not need to disable interrupts. Added energy estimation code. Added radio driver structure.

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This commit is contained in:
adamdunkels 2007-05-15 07:53:09 +00:00
parent 177e07992d
commit af997a93e0
2 changed files with 210 additions and 166 deletions
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356
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 1.5 2007/04/03 19:05:44 adamdunkels Exp $
* @(#)$Id: simple-cc2420.c,v 1.6 2007/05/15 07:53:09 adamdunkels Exp $
*/
/*
* This code is almost device independent and should be easy to port.
@ -45,8 +45,6 @@
#include <io.h>
#endif
/* #include "dev/leds.h" */
#include "dev/spi.h"
#include "dev/simple-cc2420.h"
#include "dev/cc2420_const.h"
@ -54,7 +52,8 @@
#define FOOTER1_CRC_OK 0x80
#define FOOTER1_CORRELATION 0x7f
#if 0
#define DEBUG 0
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...) do {} while (0)
@ -63,49 +62,92 @@
PROCESS(simple_cc2420_process, "CC2420 driver");
/*---------------------------------------------------------------------------*/
static void (* receiver_callback)(void);
static void (* receiver_callback)(const struct radio_driver *);
signed char simple_cc2420_last_rssi;
u8_t simple_cc2420_last_correlation;
const struct radio_driver simple_cc2420_driver =
{
simple_cc2420_send,
simple_cc2420_read,
simple_cc2420_set_receiver,
simple_cc2420_on,
simple_cc2420_off,
};
static u8_t receive_on;
/* Radio stuff in network byte order. */
static u16_t pan_id;
/*---------------------------------------------------------------------------*/
static void
strobe(enum cc2420_register regname)
{
FASTSPI_STROBE(regname);
}
/*---------------------------------------------------------------------------*/
static unsigned int
status(void)
{
u8_t status;
FASTSPI_UPD_STATUS(status);
return status;
}
/*---------------------------------------------------------------------------*/
static void
on(void)
{
ENERGEST_ON(ENERGEST_TYPE_RECEIVE);
PRINTF("on\n");
receive_on = 1;
strobe(CC2420_SRXON);
strobe(CC2420_SFLUSHRX);
ENABLE_FIFOP_INT();
}
static void
off(void)
{
u8_t spiStatusByte;
PRINTF("off\n");
receive_on = 0;
/* Wait for transmission to end before turning radio off. */
do {
spiStatusByte = status();
} while(spiStatusByte & BV(CC2420_TX_ACTIVE));
strobe(CC2420_SRFOFF);
DISABLE_FIFOP_INT();
ENERGEST_OFF(ENERGEST_TYPE_RECEIVE);
}
/*---------------------------------------------------------------------------*/
static u8_t locked, lock_on, lock_off;
#define GET_LOCK() locked = 1
static void RELEASE_LOCK(void) {
if(lock_on) {
on();
lock_on = 0;
}
if(lock_off) {
off();
lock_off = 0;
}
locked = 0;
}
/*---------------------------------------------------------------------------*/
static unsigned
getreg(enum cc2420_register regname)
{
unsigned reg;
int s = splhigh();
FASTSPI_GETREG(regname, reg);
splx(s);
return reg;
}
/*---------------------------------------------------------------------------*/
static void
setreg(enum cc2420_register regname, unsigned value)
{
int s = splhigh();
FASTSPI_SETREG(regname, value);
splx(s);
}
/*---------------------------------------------------------------------------*/
static void
strobe(enum cc2420_register regname)
{
int s = splhigh();
FASTSPI_STROBE(regname);
splx(s);
}
/*---------------------------------------------------------------------------*/
static unsigned
status(void)
{
u8_t status;
int s = splhigh();
FASTSPI_UPD_STATUS(status);
splx(s);
return status;
}
/*---------------------------------------------------------------------------*/
#define AUTOACK (1 << 4)
@ -116,7 +158,7 @@ status(void)
#define RXBPF_LOCUR (1 << 13);
/*---------------------------------------------------------------------------*/
void
simple_cc2420_set_receiver(void (* recv)(void))
simple_cc2420_set_receiver(void (* recv)(const struct radio_driver *))
{
receiver_callback = recv;
}
@ -176,18 +218,11 @@ simple_cc2420_init(void)
}
/*---------------------------------------------------------------------------*/
int
simple_cc2420_send(const u8_t *payload, u8_t payload_len)
simple_cc2420_send(const u8_t *payload, u16_t payload_len)
{
u8_t spiStatusByte;
int s, i;
int i;
/* struct hdr_802_15::len shall *not* be counted, thus the -1.
* 2 == sizeof(footer).
*/
/* if(((hdr_len - 1) + payload_len + 2) > MAX_PACKET_LEN) {
return -1;
}*/
/* This code uses the CC2420 CCA (Clear Channel Assessment) to
* implement Carrier Sense Multiple Access with Collision Avoidance
* (CSMA-CA) and requires the receiver to be enabled and ready.
@ -196,6 +231,8 @@ simple_cc2420_send(const u8_t *payload, u8_t payload_len)
return -2;
}
GET_LOCK();
/* Wait for previous transmission to finish and RSSI. */
do {
spiStatusByte = status();
@ -204,39 +241,29 @@ simple_cc2420_send(const u8_t *payload, u8_t payload_len)
}
} while(spiStatusByte & BV(CC2420_TX_ACTIVE));
#if 0
hdr->dst_pan = pan_id; /* Not at fixed position! xxx/bg */
last_correspondent = hdr->dst; /* Not dst either. */
last_used_seq++;
hdr->seq = last_used_seq;
cc2420_ack_received = 0;
#endif
/* Write packet to TX FIFO, appending FCS if AUTOCRC is enabled. */
strobe(CC2420_SFLUSHTX); /* Cancel send that never started. */
s = splhigh();
/* FASTSPI_WRITE_FIFO(hdr, hdr_len);*/
ENERGEST_ON(ENERGEST_TYPE_TRANSMIT);
{
u8_t total_len = payload_len + 2; /* 2 bytes footer. */
u8_t total_len = 2 + payload_len + 2; /* 2 bytes time stamp,
2 bytes footer. */
FASTSPI_WRITE_FIFO(&total_len, 1);
}
FASTSPI_WRITE_FIFO(payload, payload_len);
splx(s);
PRINTF("simple_cc2420_send: wrote %d bytes\n", payload_len);
/* if(hdr->dst == 0xffff) {
int i;
for(i = 1; i < 3; i++) {
if(do_send() >= 0) {
return 0;
}
clock_delay(i*256);
}
}*/
{
rtimer_clock_t t;
t = rtimer_arch_now();
FASTSPI_WRITE_FIFO(&t, 2);
}
if(FIFOP_IS_1 && !FIFO_IS_1) {
/* RXFIFO overflow, send on retransmit. */
PRINTF("rxfifo overflow!\n");
RELEASE_LOCK();
return -4;
}
@ -255,44 +282,60 @@ simple_cc2420_send(const u8_t *payload, u8_t payload_len)
strobe(CC2420_STXONCCA);
for(i = LOOP_20_SYMBOLS; i > 0; i--) {
if(SFD_IS_1) {
PRINTF("simple_cc2420: do_send() transmission has started\n");
/* PRINTF("simple_cc2420: do_send() transmission has started\n");*/
do {
spiStatusByte = status();
} while(spiStatusByte & BV(CC2420_TX_ACTIVE));
ENERGEST_OFF(ENERGEST_TYPE_TRANSMIT);
RELEASE_LOCK();
return 0; /* Transmission has started. */
}
}
PRINTF("simple_cc2420: do_send() transmission never started\n");
RELEASE_LOCK();
return -3; /* Transmission never started! */
}
/*---------------------------------------------------------------------------*/
void
static volatile u8_t packet_seen;
/*---------------------------------------------------------------------------*/
int
simple_cc2420_off(void)
{
u8_t spiStatusByte;
if(receive_on == 0) {
return;
return 1;
}
receive_on = 0;
/* Wait for transmission to end before turning radio off. */
do {
spiStatusByte = status();
} while(spiStatusByte & BV(CC2420_TX_ACTIVE));
strobe(CC2420_SRFOFF);
DISABLE_FIFOP_INT();
if(locked) {
lock_off = 1;
return 1;
}
if(packet_seen) {
lock_off = 1;
return 1;
}
off();
return 1;
}
/*---------------------------------------------------------------------------*/
void
int
simple_cc2420_on(void)
{
if(receive_on) {
return;
return 1;
}
if(locked) {
lock_on = 1;
return 1;
}
receive_on = 1;
strobe(CC2420_SRXON);
strobe(CC2420_SFLUSHRX);
ENABLE_FIFOP_INT();
on();
return 1;
}
/*---------------------------------------------------------------------------*/
void
@ -307,7 +350,6 @@ simple_cc2420_set_chan_pan_addr(unsigned channel, /* 11 - 26 */
*/
u8_t spiStatusByte;
u16_t f = channel;
int s;
f = 5*(f - 11) + 357 + 0x4000;
/*
@ -319,31 +361,11 @@ simple_cc2420_set_chan_pan_addr(unsigned channel, /* 11 - 26 */
pan_id = pan;
setreg(CC2420_FSCTRL, f);
s = splhigh();
FASTSPI_WRITE_RAM_LE(&pan, CC2420RAM_PANID, 2, f);
FASTSPI_WRITE_RAM_LE(&addr, CC2420RAM_SHORTADDR, 2, f);
if(ieee_addr != NULL) {
FASTSPI_WRITE_RAM_LE(ieee_addr, CC2420RAM_IEEEADDR, 8, f);
}
splx(s);
}
/*---------------------------------------------------------------------------*/
static volatile u8_t rx_fifo_remaining_bytes;
/*---------------------------------------------------------------------------*/
void
radio_on(void)
{
simple_cc2420_on();
}
/*---------------------------------------------------------------------------*/
void
radio_off(void)
{
/* Turn the receiver off, but only if we have not recently received
a packet. */
if(rx_fifo_remaining_bytes == 0) {
simple_cc2420_off();
}
}
/*---------------------------------------------------------------------------*/
/*
@ -353,41 +375,15 @@ radio_off(void)
* In order to quickly empty the FIFO ack processing is done at
* interrupt priority rather than poll priority.
*/
static volatile rtimer_clock_t interrupt_time;
int
__cc2420_intr(void)
{
u8_t length;
/* const u8_t *const ack_footer = (u8_t *)&h.dst_pan;*/
interrupt_time = rtimer_arch_now();
CLEAR_FIFOP_INT();
if(spi_busy || rx_fifo_remaining_bytes > 0) {
/* SPI bus hardware is currently used elsewhere (UART0 or I2C bus)
* or we already have a packet in the works and will have to defer
* interrupt processing of this packet in a fake interrupt.
*/
process_poll(&simple_cc2420_process);
return 1;
}
FASTSPI_READ_FIFO_BYTE(length);
if(length > SIMPLE_CC2420_MAX_PACKET_LEN) {
/* Oops, we must be out of sync. */
FASTSPI_STROBE(CC2420_SFLUSHRX);
FASTSPI_STROBE(CC2420_SFLUSHRX);
return 0;
}
/* The payload and footer is now left in the RX FIFO and will be
* picked up asynchronously at poll priority in the cc2420_process
* below.
*/
rx_fifo_remaining_bytes = length;
process_poll(&simple_cc2420_process);
packet_seen = 1;
return 1;
}
/*---------------------------------------------------------------------------*/
@ -396,50 +392,65 @@ PROCESS_THREAD(simple_cc2420_process, ev, data)
PROCESS_BEGIN();
while(1) {
PROCESS_YIELD();
PROCESS_YIELD_UNTIL(ev == PROCESS_EVENT_POLL);
/* printf("Diff %d\n", rtimer_arch_now() - interrupt_time);*/
if(receiver_callback != NULL) {
receiver_callback();
receiver_callback(&simple_cc2420_driver);
} else {
PRINTF("simple_cc2420_process dropping %d bytes\n",
rx_fifo_remaining_bytes);
if(rx_fifo_remaining_bytes > 0) {
int s;
s = splhigh();
FASTSPI_READ_FIFO_GARBAGE(rx_fifo_remaining_bytes);
rx_fifo_remaining_bytes = 0; /* RX FIFO emptied! */
splx(s);
}
PRINTF("simple_cc2420_process not receiving function\n");
FASTSPI_STROBE(CC2420_SFLUSHRX);
FASTSPI_STROBE(CC2420_SFLUSHRX);
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
int
simple_cc2420_read(u8_t *buf, u8_t bufsize)
u16_t
simple_cc2420_read(u8_t *buf, u16_t bufsize)
{
u8_t footer[2];
int len;
int s;
len = rx_fifo_remaining_bytes;
if(!packet_seen) {
return 0;
}
GET_LOCK();
FASTSPI_READ_FIFO_BYTE(len);
if(len > SIMPLE_CC2420_MAX_PACKET_LEN) {
/* Oops, we must be out of sync. */
FASTSPI_STROBE(CC2420_SFLUSHRX);
FASTSPI_STROBE(CC2420_SFLUSHRX);
packet_seen = 0;
RELEASE_LOCK();
return 0;
}
if(len > 0) {
/* Read payload and two bytes of footer */
if(len > bufsize) {
PRINTF("simple_cc2420_poll too big len=%d\n", len);
s = splhigh();
PRINTF("simple_cc2420_read: len %d\n", len);
if(len < 2) {
FASTSPI_READ_FIFO_GARBAGE(len);
rx_fifo_remaining_bytes = 0; /* RX FIFO emptied! */
splx(s);
len = 2; /* We eventually return len - 2 */
} else {
s = splhigh();
FASTSPI_READ_FIFO_NO_WAIT(buf, len - 2);
} else if(len - 2 > 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);
rx_fifo_remaining_bytes = 0; /* RX FIFO emptied! */
splx(s);
// len = bufsize - 2; /* We eventually return len - 2 */
len = 4;
} else {
rtimer_clock_t t;
// FASTSPI_READ_FIFO_NO_WAIT(&t, 2); /* Time stamp */
FASTSPI_READ_FIFO_NO_WAIT(buf, len - 2);
/* PRINTF("simple_cc2420_read: data\n");*/
FASTSPI_READ_FIFO_NO_WAIT(footer, 2);
/* PRINTF("simple_cc2420_read: footer\n");*/
if(footer[1] & FOOTER1_CRC_OK) {
simple_cc2420_last_rssi = footer[0];
simple_cc2420_last_correlation = footer[1] & FOOTER1_CORRELATION;
@ -447,6 +458,7 @@ simple_cc2420_read(u8_t *buf, u8_t bufsize)
uip_len = len - 2;
}*/
}
// PRINTF("Time 0x%02x\n", t);
}
}
@ -454,16 +466,40 @@ simple_cc2420_read(u8_t *buf, u8_t bufsize)
* length frame and is signaled by FIFOP = 1 and FIFO = 0.
*/
if(FIFOP_IS_1 && !FIFO_IS_1) {
PRINTF("simple_cc2420_read: FIFOP_IS_1 1\n");
strobe(CC2420_SFLUSHRX);
strobe(CC2420_SFLUSHRX);
}
if(FIFOP_IS_1) {
s = splhigh();
__cc2420_intr(); /* Fake interrupt! */
splx(s);
PRINTF("simple_cc2420_read: FIFOP_IS_1 2\n");
/* strobe(CC2420_SFLUSHRX);
strobe(CC2420_SFLUSHRX);*/
/* Another packet has been received and needs attention. */
process_poll(&simple_cc2420_process);
packet_seen = 1;
} else {
packet_seen = 0;
}
RELEASE_LOCK();
if(len < 2) {
return 0;
}
return len - 2; /* Remove two bytes for the footer. */
return len - 2; /* Remove two bytes for the footer, two bytes for time stamp. */
}
/*---------------------------------------------------------------------------*/
void
simple_cc2420_set_txpower(u8_t power)
{
u16_t reg;
GET_LOCK();
reg = getreg(CC2420_TXCTRL);
reg = (reg & 0xffe0) | (power & 0x1f);
setreg(CC2420_TXCTRL, reg);
RELEASE_LOCK();
}
/*---------------------------------------------------------------------------*/

20
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 1.2 2007/03/22 23:56:05 adamdunkels Exp $
* $Id: simple-cc2420.h,v 1.3 2007/05/15 07:53:09 adamdunkels Exp $
*/
/**
@ -42,19 +42,20 @@
#define __SIMPLE_CC2420_H__
#include "contiki.h"
#include "dev/radio.h"
#define SIMPLE_CC2420_MAX_PACKET_LEN 127
void simple_cc2420_init(void);
void simple_cc2420_on(void);
void simple_cc2420_off(void);
int simple_cc2420_on(void);
int simple_cc2420_off(void);
int simple_cc2420_read(u8_t *buf, u8_t bufsize);
u16_t simple_cc2420_read(u8_t *buf, u16_t bufsize);
int simple_cc2420_send(const u8_t *data, u8_t len);
int simple_cc2420_send(const u8_t *data, u16_t len);
void simple_cc2420_set_receiver(void (* recv)(void));
void simple_cc2420_set_receiver(void (* recv)(const struct radio_driver *d));
void simple_cc2420_set_chan_pan_addr(unsigned channel, /* 11 - 26 */
unsigned pan,
@ -64,4 +65,11 @@ void simple_cc2420_set_chan_pan_addr(unsigned channel, /* 11 - 26 */
extern signed char simple_cc2420_last_rssi;
extern u8_t simple_cc2420_last_correlation;
extern const struct radio_driver simple_cc2420_driver;
/**
* \param power Between 1 and 31.
*/
void simple_cc2420_set_txpower(u8_t power);
#endif /* __SIMPLE_CC2420_H__ */