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osd-contiki/core/dev/cc2520.c

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Initial WiSMote port based on code from Arago Systems.
2011-09-21 20:02:04 +02:00
/*
* Copyright (c) 2011, 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.
*/
/*
* This code is almost device independent and should be easy to port.
*/
#include <string.h>
#include "contiki.h"
#if defined(__AVR__)
#include <avr/io.h>
#endif
#include "dev/leds.h"
#include "dev/spi.h"
#include "dev/cc2520.h"
#include "dev/cc2520_const.h"
#include "net/packetbuf.h"
#include "net/rime/rimestats.h"
#include "net/netstack.h"
#include "sys/timetable.h"
#define WITH_SEND_CCA 1
#define FOOTER_LEN 2
#ifndef CC2520_CONF_CHECKSUM
#define CC2520_CONF_CHECKSUM 0
#endif /* CC2520_CONF_CHECKSUM */
#ifndef CC2520_CONF_AUTOACK
#define CC2520_CONF_AUTOACK 0
#endif /* CC2520_CONF_AUTOACK */
#if CC2520_CONF_CHECKSUM
#include "lib/crc16.h"
#define CHECKSUM_LEN 2
#else
#define CHECKSUM_LEN 0
#endif /* CC2520_CONF_CHECKSUM */
#define AUX_LEN (CHECKSUM_LEN + FOOTER_LEN)
#define FOOTER1_CRC_OK 0x80
#define FOOTER1_CORRELATION 0x7f
#define DEBUG 1
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
#define DEBUG_LEDS DEBUG
#undef LEDS_ON
#undef LEDS_OFF
#if DEBUG_LEDS
#define LEDS_ON(x) leds_on(x)
#define LEDS_OFF(x) leds_off(x)
#else
#define LEDS_ON(x)
#define LEDS_OFF(x)
#endif
void cc2520_arch_init(void);
/* XXX hack: these will be made as Chameleon packet attributes */
rtimer_clock_t cc2520_time_of_arrival, cc2520_time_of_departure;
int cc2520_authority_level_of_sender;
int cc2520_packets_seen, cc2520_packets_read;
static uint8_t volatile pending;
#define BUSYWAIT_UNTIL(cond, max_time) \
do { \
rtimer_clock_t t0; \
t0 = RTIMER_NOW(); \
while(!(cond) && RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + (max_time))); \
} while(0)
volatile uint8_t cc2520_sfd_counter;
volatile uint16_t cc2520_sfd_start_time;
volatile uint16_t cc2520_sfd_end_time;
static volatile uint16_t last_packet_timestamp;
/*---------------------------------------------------------------------------*/
PROCESS(cc2520_process, "CC2520 driver");
/*---------------------------------------------------------------------------*/
int cc2520_on(void);
int cc2520_off(void);
static int cc2520_read(void *buf, unsigned short bufsize);
static int cc2520_prepare(const void *data, unsigned short len);
static int cc2520_transmit(unsigned short len);
static int cc2520_send(const void *data, unsigned short len);
static int cc2520_receiving_packet(void);
static int pending_packet(void);
static int cc2520_cca(void);
/* static int detected_energy(void); */
signed char cc2520_last_rssi;
uint8_t cc2520_last_correlation;
const struct radio_driver cc2520_driver =
{
cc2520_init,
cc2520_prepare,
cc2520_transmit,
cc2520_send,
cc2520_read,
/* cc2520_set_channel, */
/* detected_energy, */
cc2520_cca,
cc2520_receiving_packet,
pending_packet,
cc2520_on,
cc2520_off,
};
static uint8_t receive_on;
static int channel;
/*---------------------------------------------------------------------------*/
static void
getrxdata(void *buf, int len)
{
CC2520_READ_FIFO_BUF(buf, len);
}
static void
getrxbyte(uint8_t *byte)
{
CC2520_READ_FIFO_BYTE(*byte);
}
static void
flushrx(void)
{
uint8_t dummy;
CC2520_READ_FIFO_BYTE(dummy);
CC2520_STROBE(CC2520_INS_SFLUSHRX);
CC2520_STROBE(CC2520_INS_SFLUSHRX);
}
/*---------------------------------------------------------------------------*/
static void strobe(uint8_t regname)
{
CC2520_STROBE(regname);
}
/*---------------------------------------------------------------------------*/
static unsigned int
status(void)
{
uint8_t status;
CC2520_GET_STATUS(status);
return status;
}
/*---------------------------------------------------------------------------*/
static uint8_t locked, lock_on, lock_off;
static void
on(void)
{
ENERGEST_ON(ENERGEST_TYPE_LISTEN);
CC2520_ENABLE_FIFOP_INT();
strobe(CC2520_INS_SRXON);
//BUSYWAIT_UNTIL(status() & (BV(CC2520_XOSC16M_STABLE)), RTIMER_SECOND / 100);
receive_on = 1;
}
static void
off(void)
{
/* PRINTF("off\n");*/
receive_on = 0;
/* Wait for transmission to end before turning radio off. */
//BUSYWAIT_UNTIL(!(status() & BV(CC2520_TX_ACTIVE)), RTIMER_SECOND / 10);
//while(status() & BV(CC2520_TX_ACTIVE));
strobe(CC2520_INS_SRFOFF);
CC2520_DISABLE_FIFOP_INT();
ENERGEST_OFF(ENERGEST_TYPE_LISTEN);
if(!CC2520_FIFOP_IS_1) {
flushrx();
}
}
/*---------------------------------------------------------------------------*/
#define GET_LOCK() locked++
static void RELEASE_LOCK(void) {
if(locked == 1) {
if(lock_on) {
on();
lock_on = 0;
}
if(lock_off) {
off();
lock_off = 0;
}
}
locked--;
}
/*---------------------------------------------------------------------------*/
static uint8_t
getreg(unsigned regname)
{
uint8_t reg;
CC2520_READ_REG(regname, reg);
return reg;
}
/*---------------------------------------------------------------------------*/
static void
setreg(unsigned regname, unsigned value)
{
CC2520_WRITE_REG(regname, value);
}
/*---------------------------------------------------------------------------*/
static void
set_txpower(uint8_t power)
{
uint16_t reg;
reg = getreg(CC2520_TXCTRL);
reg = (reg & 0xffe0) | (power & 0x1f);
setreg(CC2520_TXCTRL, reg);
}
/*---------------------------------------------------------------------------*/
#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);
/*---------------------------------------------------------------------------*/
int temp_data;
int
cc2520_init(void)
{
unsigned stat1;
{
int s = splhigh();
cc2520_arch_init(); /* Initalize ports and SPI. */
CC2520_DISABLE_FIFOP_INT();
CC2520_FIFOP_INT_INIT();
splx(s);
}
/* Turn on voltage regulator and reset. */
SET_VREG_INACTIVE();
clock_delay(250);
SET_VREG_ACTIVE();
clock_delay(250);
SET_RESET_ACTIVE();
clock_delay(127);
SET_RESET_INACTIVE();
clock_delay(125);
strobe(CC2520_INS_SXOSCON); // Turn on the crystal oscillator.
clock_delay(125);
stat1 = status();
while(!(stat1 & 0x80))
stat1 = status();
/* Change default values as recommended in the data sheet, */
/* correlation threshold = 20, RX bandpass filter = 1.3uA.*/
setreg(CC2520_TXCTRL, 0x94);
setreg(CC2520_TXPOWER, 0x13); // Output power 1 dBm
/*
valeurs de TXPOWER
0x03 -> -18 dBm
0x2C -> -7 dBm
0x88 -> -4 dBm
0x81 -> -2 dBm
0x32 -> 0 dBm
0x13 -> 1 dBm
0x32 -> 0 dBm
0x13 -> 1 dBm
0xAB -> 2 dBm
0xF2 -> 3 dBm
0xF7 -> 5 dBm
*/
setreg(CC2520_CCACTRL0, 0xF8); // CCA treshold -80dBm
// Recommended RX settings
setreg(CC2520_MDMCTRL0, 0x84); // Controls modem
setreg(CC2520_MDMCTRL1, 0x14); // Controls modem
setreg(CC2520_RXCTRL, 0x3F); // Adjust currents in RX related analog modules
setreg(CC2520_FSCTRL, 0x5A); // Adjust currents in synthesizer.
setreg(CC2520_FSCAL1, 0x2B); // Adjust currents in VCO
setreg(CC2520_AGCCTRL1, 0x11); // Adjust target value for AGC control loop
setreg(CC2520_AGCCTRL2, 0xEB);
// Disable filter on @ (remove if you want to address specific wismote)
setreg(CC2520_FRMFILT0, 0x00);
// Disable external clock
setreg(CC2520_EXTCLOCK, 0x00);
// Tune ADC performance
setreg(CC2520_ADCTEST0, 0x10);
setreg(CC2520_ADCTEST1, 0x0E);
setreg(CC2520_ADCTEST2, 0x03);
// Set auto CRC on frame
setreg(CC2520_FRMCTRL0, 0x60);
setreg(CC2520_FIFOPCTRL, 0x0F);
cc2520_set_pan_addr(0xbabe, 0x0000, NULL);
cc2520_set_channel(15);
flushrx();
process_start(&cc2520_process, NULL);
return 1;
}
/*---------------------------------------------------------------------------*/
static int
cc2520_transmit(unsigned short payload_len)
{
int i, txpower;
uint8_t total_len;
#if CC2520_CONF_CHECKSUM
uint16_t checksum;
#endif /* CC2520_CONF_CHECKSUM */
GET_LOCK();
#if (DEBUG == 1)
P8OUT &= ~BIT6; // TODO LED FLASH for the debug on transmission
#endif
txpower = 0;
if(packetbuf_attr(PACKETBUF_ATTR_RADIO_TXPOWER) > 0) {
/* Remember the current transmission power */
txpower = cc2520_get_txpower();
/* Set the specified transmission power */
//TODOset_txpower(packetbuf_attr(PACKETBUF_ATTR_RADIO_TXPOWER) - 1);
}
total_len = payload_len + AUX_LEN;
/* 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 CC2520_TX_ACTIVE check in cc2520_send.
*
* Note that we may have to wait up to 320 us (20 symbols) before
* transmission starts.
*/
#ifndef CC2520_CONF_SYMBOL_LOOP_COUNT
#error CC2520_CONF_SYMBOL_LOOP_COUNT needs to be set!!!
#else
#define LOOP_20_SYMBOLS CC2520_CONF_SYMBOL_LOOP_COUNT
#endif
#if WITH_SEND_CCA
strobe(CC2520_INS_SRXON);
//BUSYWAIT_UNTIL(status() & BV(CC2520_TX_ACTIVE) , RTIMER_SECOND / 100);
strobe(CC2520_INS_STXONCCA);
#else /* WITH_SEND_CCA */
strobe(CC2520_INS_STXON);
#endif /* WITH_SEND_CCA */
for(i = LOOP_20_SYMBOLS; i > 0; i--) {
if(CC2520_SFD_IS_1) {
{
rtimer_clock_t sfd_timestamp;
sfd_timestamp = cc2520_sfd_start_time;
if(packetbuf_attr(PACKETBUF_ATTR_PACKET_TYPE) ==
PACKETBUF_ATTR_PACKET_TYPE_TIMESTAMP) {
/* Write timestamp to last two bytes of packet in TXFIFO. */
CC2520_WRITE_RAM(&sfd_timestamp, CC2520RAM_TXFIFO + payload_len - 1, 2);
}
}
if(!(status() & BV(CC2520_TX_ACTIVE))) {
/* SFD went high but we are not transmitting. This means that
we just started receiving a packet, so we drop the
transmission. */
RELEASE_LOCK();
return RADIO_TX_COLLISION;
}
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.*/
//BUSYWAIT_UNTIL(getreg(CC2520_EXCFLAG0) & TX_FRM_DONE , RTIMER_SECOND / 100);
//BUSYWAIT_UNTIL(!(status() & BV(CC2520_TX_ACTIVE)), RTIMER_SECOND / 10);
#ifdef ENERGEST_CONF_LEVELDEVICE_LEVELS
ENERGEST_OFF_LEVEL(ENERGEST_TYPE_TRANSMIT,cc2520_get_txpower());
#endif
ENERGEST_OFF(ENERGEST_TYPE_TRANSMIT);
if(receive_on) {
ENERGEST_ON(ENERGEST_TYPE_LISTEN);
} else {
/* We need to explicitly turn off the radio,
* since STXON[CCA] -> TX_ACTIVE -> RX_ACTIVE */
off();
}
if(packetbuf_attr(PACKETBUF_ATTR_RADIO_TXPOWER) > 0) {
/* Restore the transmission power */
set_txpower(txpower & 0xff);
}
RELEASE_LOCK();
if (getreg(CC2520_EXCFLAG0) & TX_FRM_DONE )
return RADIO_TX_OK;
else
return RADIO_TX_COLLISION;
}
}
/* 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("cc2520: do_send() transmission never started\n");
if(packetbuf_attr(PACKETBUF_ATTR_RADIO_TXPOWER) > 0) {
/* Restore the transmission power */
set_txpower(txpower & 0xff);
}
RELEASE_LOCK();
return RADIO_TX_COLLISION;
}
/*---------------------------------------------------------------------------*/
static int
cc2520_prepare(const void *payload, unsigned short payload_len)
{
uint8_t total_len;
#if CC2520_CONF_CHECKSUM
uint16_t checksum;
#endif /* CC2520_CONF_CHECKSUM */
GET_LOCK();
PRINTF("cc2520: sending %d bytes\n", payload_len);
/*int i;
for(i = 0; i < payload_len;i++)
printf("%x",((uint8_t *) payload)[i]);
printf("\n");*/
RIMESTATS_ADD(lltx);
/* Wait for any previous transmission to finish. */
/* while(status() & BV(CC2520_TX_ACTIVE));*/
/* Write packet to TX FIFO. */
strobe(CC2520_INS_SFLUSHTX);
#if CC2520_CONF_CHECKSUM
checksum = crc16_data(payload, payload_len, 0);
#endif /* CC2520_CONF_CHECKSUM */
total_len = payload_len + AUX_LEN;
CC2520_WRITE_FIFO_BUF(&total_len, 1);
CC2520_WRITE_FIFO_BUF(payload, payload_len);
#if CC2520_CONF_CHECKSUM
CC2520_WRITE_FIFO_BUF(&checksum, CHECKSUM_LEN);
#endif /* CC2520_CONF_CHECKSUM */
RELEASE_LOCK();
return 0;
}
/*---------------------------------------------------------------------------*/
static int
cc2520_send(const void *payload, unsigned short payload_len)
{
cc2520_prepare(payload, payload_len);
return cc2520_transmit(payload_len);
}
/*---------------------------------------------------------------------------*/
int
cc2520_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) {
/* ("Off when locked (%d)\n", locked);*/
lock_off = 1;
return 1;
}
GET_LOCK();
/* 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(status() & BV(CC2520_TX_ACTIVE)) {
lock_off = 1;
} else {
off();
}
RELEASE_LOCK();
return 1;
}
/*---------------------------------------------------------------------------*/
int
cc2520_on(void)
{
if(receive_on) {
return 1;
}
if(locked) {
lock_on = 1;
return 1;
}
GET_LOCK();
on();
RELEASE_LOCK();
return 1;
}
/*---------------------------------------------------------------------------*/
int
cc2520_get_channel(void)
{
return channel;
}
/*---------------------------------------------------------------------------*/
int
cc2520_set_channel(int c)
{
uint16_t f;
GET_LOCK();
/*
* 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 = MIN_CHANNEL + ((channel - MIN_CHANNEL) * CHANNEL_SPACING);
/*
* Writing RAM requires crystal oscillator to be stable.
*/
while(!(status() & (BV(CC2520_XOSC16M_STABLE))));
/* Wait for any transmission to end. */
while(status() & BV(CC2520_TX_ACTIVE));
// Define radio channel (between 11 and 25)
setreg(CC2520_FREQCTRL, f );
/* If we are in receive mode, we issue an SRXON command to ensure
that the VCO is calibrated. */
if(receive_on) {
strobe(CC2520_INS_SRXON);
}
RELEASE_LOCK();
return 1;
}
/*---------------------------------------------------------------------------*/
void
cc2520_set_pan_addr(unsigned pan,
unsigned addr,
const uint8_t *ieee_addr)
{
uint8_t tmp[2];
GET_LOCK();
/*
* Writing RAM requires crystal oscillator to be stable.
*/
//BUSYWAIT_UNTIL(status() & (BV(CC2520_XOSC16M_STABLE)), RTIMER_SECOND / 10);
tmp[0] = pan & 0xff;
tmp[1] = pan >> 8;
CC2520_WRITE_RAM(&tmp, CC2520RAM_PANID, 2);
tmp[0] = addr & 0xff;
tmp[1] = addr >> 8;
CC2520_WRITE_RAM(&tmp, CC2520RAM_SHORTADDR, 2);
/*
if(ieee_addr != NULL) {
uint8_t tmp_addr[8];
// LSB first, MSB last for 802.15.4 addresses in CC2520
for (f = 0; f < 8; f++) {
tmp_addr[7 - f] = ieee_addr[f];
}
CC2520_WRITE_RAM(tmp_addr, CC2520RAM_IEEEADDR, 8);
}*/
RELEASE_LOCK();
}
/*---------------------------------------------------------------------------*/
/*
* Interrupt leaves frame intact in FIFO.
*/
#if CC2520_TIMETABLE_PROFILING
#define cc2520_timetable_size 16
TIMETABLE(cc2520_timetable);
TIMETABLE_AGGREGATE(aggregate_time, 10);
#endif /* CC2520_TIMETABLE_PROFILING */
int
cc2520_interrupt(void)
{
CC2520_CLEAR_FIFOP_INT();
process_poll(&cc2520_process);
#if CC2520_TIMETABLE_PROFILING
timetable_clear(&cc2520_timetable);
TIMETABLE_TIMESTAMP(cc2520_timetable, "interrupt");
#endif /* CC2520_TIMETABLE_PROFILING */
last_packet_timestamp = cc2520_sfd_start_time;
pending++;
cc2520_packets_seen++;
return 1;
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(cc2520_process, ev, data)
{
int len;
PROCESS_BEGIN();
PRINTF("cc2520_process: started\n");
while(1) {
PROCESS_YIELD_UNTIL(ev == PROCESS_EVENT_POLL);
#if CC2520_TIMETABLE_PROFILING
TIMETABLE_TIMESTAMP(cc2520_timetable, "poll");
#endif /* CC2520_TIMETABLE_PROFILING */
PRINTF("cc2520_process: calling receiver callback\n");
packetbuf_clear();
packetbuf_set_attr(PACKETBUF_ATTR_TIMESTAMP, last_packet_timestamp);
len = cc2520_read(packetbuf_dataptr(), PACKETBUF_SIZE);
packetbuf_set_datalen(len);
NETSTACK_RDC.input();
flushrx();
#if CC2520_TIMETABLE_PROFILING
TIMETABLE_TIMESTAMP(cc2520_timetable, "end");
timetable_aggregate_compute_detailed(&aggregate_time,
&cc2520_timetable);
timetable_clear(&cc2520_timetable);
#endif /* CC2520_TIMETABLE_PROFILING */
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
static int
cc2520_read(void *buf, unsigned short bufsize)
{
uint8_t footer[2];
uint8_t len;
#if CC2520_CONF_CHECKSUM
uint16_t checksum;
#endif /* CC2520_CONF_CHECKSUM */
if((!CC2520_FIFOP_IS_1) & !(getreg(CC2520_EXCFLAG1) & RX_FRM_DONE)) {
return 0;
}
#if (DEBUG == 1)
P2OUT &= ~BIT4; // TODO LED FLASH for the debug on reception
#endif
//BUSYWAIT_UNTIL( (status() & BV(CC2520_RX_ACTIVE)) , RTIMER_SECOND / 100);
//BUSYWAIT_UNTIL(getreg(CC2520_EXCFLAG1) & RX_FRM_DONE , RTIMER_SECOND / 100);
/* if(!pending) {
return 0;
}*/
pending = 0;
GET_LOCK();
cc2520_packets_read++;
getrxbyte(&len);
if(len > CC2520_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 CC2520_CONF_CHECKSUM
getrxdata(&checksum, CHECKSUM_LEN);
#endif /* CC2520_CONF_CHECKSUM */
getrxdata(footer, FOOTER_LEN);
#if CC2520_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 /* CC2520_CONF_CHECKSUM */
cc2520_last_rssi = footer[0];
cc2520_last_correlation = footer[1] & FOOTER1_CORRELATION;
packetbuf_set_attr(PACKETBUF_ATTR_RSSI, cc2520_last_rssi);
packetbuf_set_attr(PACKETBUF_ATTR_LINK_QUALITY, cc2520_last_correlation);
RIMESTATS_ADD(llrx);
} else {
RIMESTATS_ADD(badcrc);
len = AUX_LEN;
}
if(CC2520_FIFOP_IS_1) {
if(!CC2520_FIFO_IS_1) {
/* Clean up in case of FIFO overflow! This happens for every
* full length frame and is signaled by FIFOP = 1 and FIFO =
* 0. */
flushrx();
} else {
/* Another packet has been received and needs attention. */
process_poll(&cc2520_process);
}
}
RELEASE_LOCK();
if(len < AUX_LEN) {
return 0;
}
return len - AUX_LEN;
}
/*---------------------------------------------------------------------------*/
void
cc2520_set_txpower(uint8_t power)
{
GET_LOCK();
set_txpower(power);
RELEASE_LOCK();
}
/*---------------------------------------------------------------------------*/
int
cc2520_get_txpower(void)
{
int power;
GET_LOCK();
power = (int)(getreg(CC2520_TXCTRL) & 0x001f);
RELEASE_LOCK();
return power;
}
/*---------------------------------------------------------------------------*/
int
cc2520_rssi(void)
{
int rssi;
int radio_was_off = 0;
if(locked) {
return 0;
}
GET_LOCK();
if(!receive_on) {
radio_was_off = 1;
cc2520_on();
}
//BUSYWAIT_UNTIL(status() & BV(CC2520_RSSI_VALID), RTIMER_SECOND / 100);
rssi = (int)((signed char)getreg(CC2520_RSSI));
if(radio_was_off) {
cc2520_off();
}
RELEASE_LOCK();
return rssi;
}
/*---------------------------------------------------------------------------*/
/*
static int
detected_energy(void)
{
return cc2520_rssi();
}
*/
/*---------------------------------------------------------------------------*/
int
cc2520_cca_valid(void)
{
int valid;
if(locked) {
return 1;
}
GET_LOCK();
valid = !!(status() & BV(CC2520_RSSI_VALID));
RELEASE_LOCK();
return valid;
}
/*---------------------------------------------------------------------------*/
static int
cc2520_cca(void)
{
int cca;
int radio_was_off = 0;
/* If the radio is locked by an underlying thread (because we are
being invoked through an interrupt), we preted that the coast is
clear (i.e., no packet is currently being transmitted by a
neighbor). */
if(locked) {
return 1;
}
GET_LOCK();
if(!receive_on) {
radio_was_off = 1;
cc2520_on();
}
/* Make sure that the radio really got turned on. */
if(!receive_on) {
RELEASE_LOCK();
if(radio_was_off) {
cc2520_off();
}
return 1;
}
//BUSYWAIT_UNTIL(status() & BV(CC2520_RSSI_VALID), RTIMER_SECOND / 100);
cca = CC2520_CCA_IS_1;
if(radio_was_off) {
cc2520_off();
}
RELEASE_LOCK();
return cca;
}
/*---------------------------------------------------------------------------*/
int
cc2520_receiving_packet(void)
{
return CC2520_SFD_IS_1;
}
/*---------------------------------------------------------------------------*/
static int
pending_packet(void)
{
return CC2520_FIFOP_IS_1;
}
/*---------------------------------------------------------------------------*/
void
cc2520_set_cca_threshold(int value)
{
uint16_t shifted = value << 8;
GET_LOCK();
setreg(CC2520_RSSI, shifted);
RELEASE_LOCK();
}
/*---------------------------------------------------------------------------*/
Reference in a new issue Copy permalink