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nes-proj/core/dev/cc2420.c

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/*
* Copyright (c) 2007, Swedish Institute of Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
* @(#)$Id: cc2420.c,v 1.30 2009/04/29 11:38:50 adamdunkels Exp $
*/
/*
* This code is almost device independent and should be easy to port.
*/
#include <stdio.h>
#include <string.h>
#include "contiki.h"
#if defined(__AVR__)
#include <avr/io.h>
#elif defined(__MSP430__)
#include <io.h>
#endif
#include "dev/leds.h"
#include "dev/spi.h"
#include "dev/cc2420.h"
#include "dev/cc2420_const.h"
#include "net/rime/packetbuf.h"
#include "net/rime/rimestats.h"
#include "sys/timetable.h"
#define WITH_SEND_CCA 0
#if CC2420_CONF_TIMESTAMPS
#include "net/rime/timesynch.h"
#define TIMESTAMP_LEN 3
#else /* CC2420_CONF_TIMESTAMPS */
#define TIMESTAMP_LEN 0
#endif /* CC2420_CONF_TIMESTAMPS */
#define FOOTER_LEN 2
#ifndef CC2420_CONF_CHECKSUM
#define CC2420_CONF_CHECKSUM 0
#endif /* CC2420_CONF_CHECKSUM */
#if CC2420_CONF_CHECKSUM
#include "lib/crc16.h"
#define CHECKSUM_LEN 2
#else
#define CHECKSUM_LEN 0
#endif /* CC2420_CONF_CHECKSUM */
#define AUX_LEN (CHECKSUM_LEN + TIMESTAMP_LEN + FOOTER_LEN)
struct timestamp {
uint16_t time;
uint8_t authority_level;
};
#define FOOTER1_CRC_OK 0x80
#define FOOTER1_CORRELATION 0x7f
#define DEBUG 0
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...) do {} while (0)
#endif
void cc2420_arch_init(void);
/* XXX hack: these will be made as Chameleon packet attributes */
rtimer_clock_t cc2420_time_of_arrival, cc2420_time_of_departure;
int cc2420_authority_level_of_sender;
#if CC2420_CONF_TIMESTAMPS
static rtimer_clock_t setup_time_for_transmission;
static unsigned long total_time_for_transmission, total_transmission_len;
static int num_transmissions;
#endif /* CC2420_CONF_TIMESTAMPS */
/*---------------------------------------------------------------------------*/
PROCESS(cc2420_process, "CC2420 driver");
/*---------------------------------------------------------------------------*/
static void (* receiver_callback)(const struct radio_driver *);
int cc2420_on(void);
int cc2420_off(void);
int cc2420_read(void *buf, unsigned short bufsize);
int cc2420_send(const void *data, unsigned short len);
void cc2420_set_receiver(void (* recv)(const struct radio_driver *d));
signed char cc2420_last_rssi;
uint8_t cc2420_last_correlation;
const struct radio_driver cc2420_driver =
{
cc2420_send,
cc2420_read,
cc2420_set_receiver,
cc2420_on,
cc2420_off,
};
static uint8_t receive_on;
/* Radio stuff in network byte order. */
static uint16_t pan_id;
static int channel;
/*---------------------------------------------------------------------------*/
static uint8_t rxptr; /* Pointer to the next byte in the rxfifo. */
static void
getrxdata(void *buf, int len)
{
FASTSPI_READ_FIFO_NO_WAIT(buf, len);
rxptr = (rxptr + len) & 0x7f;
}
static void
getrxbyte(uint8_t *byte)
{
FASTSPI_READ_FIFO_BYTE(*byte);
rxptr = (rxptr + 1) & 0x7f;
}
static void
flushrx(void)
{
uint8_t dummy;
FASTSPI_READ_FIFO_BYTE(dummy);
FASTSPI_STROBE(CC2420_SFLUSHRX);
FASTSPI_STROBE(CC2420_SFLUSHRX);
rxptr = 0;
}
/*---------------------------------------------------------------------------*/
static void
strobe(enum cc2420_register regname)
{
FASTSPI_STROBE(regname);
}
/*---------------------------------------------------------------------------*/
static unsigned int
status(void)
{
uint8_t status;
FASTSPI_UPD_STATUS(status);
return status;
}
/*---------------------------------------------------------------------------*/
static uint8_t locked, lock_on, lock_off;
static void
on(void)
{
ENERGEST_ON(ENERGEST_TYPE_LISTEN);
PRINTF("on\n");
receive_on = 1;
ENABLE_FIFOP_INT();
strobe(CC2420_SRXON);
flushrx();
}
static void
off(void)
{
PRINTF("off\n");
receive_on = 0;
/* Wait for transmission to end before turning radio off. */
while(status() & BV(CC2420_TX_ACTIVE));
strobe(CC2420_SRFOFF);
DISABLE_FIFOP_INT();
ENERGEST_OFF(ENERGEST_TYPE_LISTEN);
}
/*---------------------------------------------------------------------------*/
#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;
FASTSPI_GETREG(regname, reg);
return reg;
}
/*---------------------------------------------------------------------------*/
static void
setreg(enum cc2420_register regname, unsigned value)
{
FASTSPI_SETREG(regname, value);
}
/*---------------------------------------------------------------------------*/
#define AUTOACK (1 << 4)
#define ADR_DECODE (1 << 11)
#define RXFIFO_PROTECTION (1 << 9)
#define CORR_THR(n) (((n) & 0x1f) << 6)
#define FIFOP_THR(n) ((n) & 0x7f)
#define RXBPF_LOCUR (1 << 13);
/*---------------------------------------------------------------------------*/
void
cc2420_set_receiver(void (* recv)(const struct radio_driver *))
{
receiver_callback = recv;
}
/*---------------------------------------------------------------------------*/
void
cc2420_init(void)
{
uint16_t reg;
{
int s = splhigh();
cc2420_arch_init(); /* Initalize ports and SPI. */
DISABLE_FIFOP_INT();
FIFOP_INT_INIT();
splx(s);
}
/* Turn on voltage regulator and reset. */
SET_VREG_ACTIVE();
//clock_delay(250); OK
SET_RESET_ACTIVE();
clock_delay(127);
SET_RESET_INACTIVE();
//clock_delay(125); OK
/* Turn on the crystal oscillator. */
strobe(CC2420_SXOSCON);
/* Turn off automatic packet acknowledgment. */
reg = getreg(CC2420_MDMCTRL0);
reg &= ~AUTOACK;
setreg(CC2420_MDMCTRL0, reg);
/* Turn off address decoding. */
reg = getreg(CC2420_MDMCTRL0);
reg &= ~ADR_DECODE;
setreg(CC2420_MDMCTRL0, reg);
/* Change default values as recomended in the data sheet, */
/* correlation threshold = 20, RX bandpass filter = 1.3uA. */
setreg(CC2420_MDMCTRL1, CORR_THR(20));
reg = getreg(CC2420_RXCTRL1);
reg |= RXBPF_LOCUR;
setreg(CC2420_RXCTRL1, reg);
/* Set the FIFOP threshold to maximum. */
setreg(CC2420_IOCFG0, FIFOP_THR(127));
/* Turn off "Security enable" (page 32). */
reg = getreg(CC2420_SECCTRL0);
reg &= ~RXFIFO_PROTECTION;
setreg(CC2420_SECCTRL0, reg);
cc2420_set_pan_addr(0xffff, 0x0000, NULL);
cc2420_set_channel(26);
process_start(&cc2420_process, NULL);
}
/*---------------------------------------------------------------------------*/
int
cc2420_send(const void *payload, unsigned short payload_len)
{
int i;
uint8_t total_len;
#if CC2420_CONF_TIMESTAMPS
struct timestamp timestamp;
#endif /* CC2420_CONF_TIMESTAMPS */
#if CC2420_CONF_CHECKSUM
uint16_t checksum;
#endif /* CC2420_CONF_CHECKSUM */
GET_LOCK();
if(packetbuf_attr(PACKETBUF_ATTR_RADIO_TXPOWER) > 0) {
cc2420_set_txpower(packetbuf_attr(PACKETBUF_ATTR_RADIO_TXPOWER) - 1);
} else {
cc2420_set_txpower(CC2420_TXPOWER_MAX);
}
PRINTF("cc2420: sending %d bytes\n", payload_len);
RIMESTATS_ADD(lltx);
/* Wait for any previous transmission to finish. */
while(status() & BV(CC2420_TX_ACTIVE));
/* Write packet to TX FIFO. */
strobe(CC2420_SFLUSHTX);
#if CC2420_CONF_CHECKSUM
checksum = crc16_data(payload, payload_len, 0);
#endif /* CC2420_CONF_CHECKSUM */
total_len = payload_len + AUX_LEN;
FASTSPI_WRITE_FIFO(&total_len, 1);
FASTSPI_WRITE_FIFO(payload, payload_len);
#if CC2420_CONF_CHECKSUM
FASTSPI_WRITE_FIFO(&checksum, CHECKSUM_LEN);
#endif /* CC2420_CONF_CHECKSUM */
#if CC2420_CONF_TIMESTAMPS
timestamp.authority_level = timesynch_authority_level();
timestamp.time = timesynch_time();
FASTSPI_WRITE_FIFO(&timestamp, TIMESTAMP_LEN);
#endif /* CC2420_CONF_TIMESTAMPS */
/* The TX FIFO can only hold one packet. Make sure to not overrun
* FIFO by waiting for transmission to start here and synchronizing
* with the CC2420_TX_ACTIVE check in cc2420_send.
*
* Note that we may have to wait up to 320 us (20 symbols) before
* transmission starts.
*/
#ifdef TMOTE_SKY
#define LOOP_20_SYMBOLS 400 /* 326us (msp430 @ 2.4576MHz) */
#elif __AVR__
#define LOOP_20_SYMBOLS 500 /* XXX */
#endif
#if WITH_SEND_CCA
strobe(CC2420_SRXON);
while(!(status() & BV(CC2420_RSSI_VALID)));
strobe(CC2420_STXONCCA);
#else /* WITH_SEND_CCA */
strobe(CC2420_STXON);
#endif /* WITH_SEND_CCA */
for(i = LOOP_20_SYMBOLS; i > 0; i--) {
if(SFD_IS_1) {
#if CC2420_CONF_TIMESTAMPS
rtimer_clock_t txtime = timesynch_time();
#endif /* CC2420_CONF_TIMESTAMPS */
if(receive_on) {
ENERGEST_OFF(ENERGEST_TYPE_LISTEN);
}
ENERGEST_ON(ENERGEST_TYPE_TRANSMIT);
/* We wait until transmission has ended so that we get an
accurate measurement of the transmission time.*/
while(status() & BV(CC2420_TX_ACTIVE));
#if CC2420_CONF_TIMESTAMPS
setup_time_for_transmission = txtime - timestamp.time;
if(num_transmissions < 10000) {
total_time_for_transmission += timesynch_time() - txtime;
total_transmission_len += total_len;
num_transmissions++;
}
#endif /* CC2420_CONF_TIMESTAMPS */
#ifdef ENERGEST_CONF_LEVELDEVICE_LEVELS
ENERGEST_OFF_LEVEL(ENERGEST_TYPE_TRANSMIT,cc2420_get_txpower());
#endif
ENERGEST_OFF(ENERGEST_TYPE_TRANSMIT);
if(receive_on) {
ENERGEST_ON(ENERGEST_TYPE_LISTEN);
}
RELEASE_LOCK();
return 0;
}
}
/* If we are using WITH_SEND_CCA, we get here if the packet wasn't
transmitted because of other channel activity. */
RIMESTATS_ADD(contentiondrop);
PRINTF("cc2420: do_send() transmission never started\n");
RELEASE_LOCK();
return -3; /* Transmission never started! */
}
/*---------------------------------------------------------------------------*/
int
cc2420_off(void)
{
/* Don't do anything if we are already turned off. */
if(receive_on == 0) {
return 1;
}
/* If we are called when the driver is locked, we indicate that the
radio should be turned off when the lock is unlocked. */
if(locked) {
lock_off = 1;
return 1;
}
/* If we are currently receiving a packet (indicated by SFD == 1),
we don't actually switch the radio off now, but signal that the
driver should switch off the radio once the packet has been
received and processed, by setting the 'lock_off' variable. */
if(SFD_IS_1) {
lock_off = 1;
return 1;
}
off();
return 1;
}
/*---------------------------------------------------------------------------*/
int
cc2420_on(void)
{
if(receive_on) {
return 1;
}
if(locked) {
lock_on = 1;
return 1;
}
on();
return 1;
}
/*---------------------------------------------------------------------------*/
int
cc2420_get_channel(void)
{
return channel;
}
/*---------------------------------------------------------------------------*/
void
cc2420_set_channel(int c)
{
uint16_t f;
/*
* Subtract the base channel (11), multiply by 5, which is the
* channel spacing. 357 is 2405-2048 and 0x4000 is LOCK_THR = 1.
*/
channel = c;
f = 5 * (c - 11) + 357 + 0x4000;
/*
* Writing RAM requires crystal oscillator to be stable.
*/
while(!(status() & (BV(CC2420_XOSC16M_STABLE))));
/* Wait for any transmission to end. */
while(status() & BV(CC2420_TX_ACTIVE));
setreg(CC2420_FSCTRL, f);
/* If we are in receive mode, we issue an SRXON command to ensure
that the VCO is calibrated. */
if(receive_on) {
strobe(CC2420_SRXON);
}
}
/*---------------------------------------------------------------------------*/
void
cc2420_set_pan_addr(unsigned pan,
unsigned addr,
const uint8_t *ieee_addr)
{
uint16_t f = 0;
/*
* Writing RAM requires crystal oscillator to be stable.
*/
while(!(status() & (BV(CC2420_XOSC16M_STABLE))));
pan_id = pan;
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);
}
}
/*---------------------------------------------------------------------------*/
/*
* Interrupt leaves frame intact in FIFO.
*/
#if CC2420_CONF_TIMESTAMPS
static volatile rtimer_clock_t interrupt_time;
static volatile int interrupt_time_set;
#endif /* CC2420_CONF_TIMESTAMPS */
#if CC2420_TIMETABLE_PROFILING
#define cc2420_timetable_size 16
TIMETABLE(cc2420_timetable);
TIMETABLE_AGGREGATE(aggregate_time, 10);
#endif /* CC2420_TIMETABLE_PROFILING */
int
cc2420_interrupt(void)
{
#if CC2420_CONF_TIMESTAMPS
interrupt_time = timesynch_time();
interrupt_time_set = 1;
#endif /* CC2420_CONF_TIMESTAMPS */
CLEAR_FIFOP_INT();
process_poll(&cc2420_process);
#if CC2420_TIMETABLE_PROFILING
timetable_clear(&cc2420_timetable);
TIMETABLE_TIMESTAMP(cc2420_timetable, "interrupt");
#endif /* CC2420_TIMETABLE_PROFILING */
return 1;
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(cc2420_process, ev, data)
{
PROCESS_BEGIN();
PRINTF("cc2420_process: started\n");
while(1) {
PROCESS_YIELD_UNTIL(ev == PROCESS_EVENT_POLL);
#if CC2420_TIMETABLE_PROFILING
TIMETABLE_TIMESTAMP(cc2420_timetable, "poll");
#endif /* CC2420_TIMETABLE_PROFILING */
if(receiver_callback != NULL) {
PRINTF("cc2420_process: calling receiver callback\n");
receiver_callback(&cc2420_driver);
#if CC2420_TIMETABLE_PROFILING
TIMETABLE_TIMESTAMP(cc2420_timetable, "end");
timetable_aggregate_compute_detailed(&aggregate_time,
&cc2420_timetable);
timetable_clear(&cc2420_timetable);
#endif /* CC2420_TIMETABLE_PROFILING */
} else {
PRINTF("cc2420_process not receiving function\n");
flushrx();
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
int
cc2420_read(void *buf, unsigned short bufsize)
{
uint8_t footer[2];
uint8_t len;
#if CC2420_CONF_CHECKSUM
uint16_t checksum;
#endif /* CC2420_CONF_CHECKSUM */
#if CC2420_CONF_TIMESTAMPS
struct timestamp t;
#endif /* CC2420_CONF_TIMESTAMPS */
if(!FIFOP_IS_1) {
/* If FIFOP is 0, there is no packet in the RXFIFO. */
return 0;
}
#if CC2420_CONF_TIMESTAMPS
if(interrupt_time_set) {
cc2420_time_of_arrival = interrupt_time;
interrupt_time_set = 0;
} else {
cc2420_time_of_arrival = 0;
}
cc2420_time_of_departure = 0;
#endif /* CC2420_CONF_TIMESTAMPS */
GET_LOCK();
getrxbyte(&len);
if(len > CC2420_MAX_PACKET_LEN) {
/* Oops, we must be out of sync. */
flushrx();
RIMESTATS_ADD(badsynch);
RELEASE_LOCK();
return 0;
}
if(len <= AUX_LEN) {
flushrx();
RIMESTATS_ADD(tooshort);
RELEASE_LOCK();
return 0;
}
if(len - AUX_LEN > bufsize) {
flushrx();
RIMESTATS_ADD(toolong);
RELEASE_LOCK();
return 0;
}
getrxdata(buf, len - AUX_LEN);
#if CC2420_CONF_CHECKSUM
getrxdata(&checksum, CHECKSUM_LEN);
#endif /* CC2420_CONF_CHECKSUM */
#if CC2420_CONF_TIMESTAMPS
getrxdata(&t, TIMESTAMP_LEN);
#endif /* CC2420_CONF_TIMESTAMPS */
getrxdata(footer, FOOTER_LEN);
#if CC2420_CONF_CHECKSUM
if(checksum != crc16_data(buf, len - AUX_LEN, 0)) {
PRINTF("checksum failed 0x%04x != 0x%04x\n",
checksum, crc16_data(buf, len - AUX_LEN, 0));
}
if(footer[1] & FOOTER1_CRC_OK &&
checksum == crc16_data(buf, len - AUX_LEN, 0)) {
#else
if(footer[1] & FOOTER1_CRC_OK) {
#endif /* CC2420_CONF_CHECKSUM */
cc2420_last_rssi = footer[0];
cc2420_last_correlation = footer[1] & FOOTER1_CORRELATION;
packetbuf_set_attr(PACKETBUF_ATTR_RSSI, cc2420_last_rssi);
packetbuf_set_attr(PACKETBUF_ATTR_LINK_QUALITY, cc2420_last_correlation);
RIMESTATS_ADD(llrx);
#if CC2420_CONF_TIMESTAMPS
cc2420_time_of_departure =
t.time +
setup_time_for_transmission +
(total_time_for_transmission * (len - 2)) / total_transmission_len;
cc2420_authority_level_of_sender = t.authority_level;
packetbuf_set_attr(PACKETBUF_ATTR_TIMESTAMP, t.time);
#endif /* CC2420_CONF_TIMESTAMPS */
} else {
RIMESTATS_ADD(badcrc);
len = AUX_LEN;
}
/* Clean up in case of FIFO overflow! This happens for every full
* length frame and is signaled by FIFOP = 1 and FIFO = 0.
*/
if(FIFOP_IS_1 && !FIFO_IS_1) {
/* printf("cc2420_read: FIFOP_IS_1 1\n");*/
flushrx();
} else if(FIFOP_IS_1) {
/* Another packet has been received and needs attention. */
process_poll(&cc2420_process);
}
RELEASE_LOCK();
if(len < AUX_LEN) {
return 0;
}
return len - AUX_LEN;
}
/*---------------------------------------------------------------------------*/
void
cc2420_set_txpower(uint8_t power)
{
uint16_t reg;
GET_LOCK();
reg = getreg(CC2420_TXCTRL);
reg = (reg & 0xffe0) | (power & 0x1f);
setreg(CC2420_TXCTRL, reg);
RELEASE_LOCK();
}
/*---------------------------------------------------------------------------*/
int
cc2420_get_txpower(void)
{
return (int)(getreg(CC2420_TXCTRL) & 0x001f);
}
/*---------------------------------------------------------------------------*/
int
cc2420_rssi(void)
{
int rssi;
int radio_was_off = 0;
if(!receive_on) {
radio_was_off = 1;
cc2420_on();
}
while(!(status() & BV(CC2420_RSSI_VALID))) {
/* printf("cc2420_rssi: RSSI not valid.\n");*/
}
rssi = (int)((signed char)getreg(CC2420_RSSI));
if(radio_was_off) {
cc2420_off();
}
return rssi;
}
/*---------------------------------------------------------------------------*/
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