c67c048cac
The CCA-threshold now defaults to -46 which give better simulation results and typically also better experimental results. This adjustment is also needed due to commit 0a13f99 in mspsim. As promised in https://github.com/mspsim/mspsim/pull/18 it broke the regression tests.
896 lines
22 KiB
C
896 lines
22 KiB
C
/*
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* Copyright (c) 2007, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/*
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* This code is almost device independent and should be easy to port.
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*/
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#include <string.h>
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#include "contiki.h"
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#if defined(__AVR__)
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#include <avr/io.h>
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#endif
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#include "dev/leds.h"
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#include "dev/spi.h"
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#include "dev/cc2420.h"
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#include "dev/cc2420_const.h"
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#include "net/packetbuf.h"
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#include "net/rime/rimestats.h"
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#include "net/netstack.h"
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#include "sys/timetable.h"
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#define WITH_SEND_CCA 1
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#define FOOTER_LEN 2
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#ifndef CC2420_CONF_CHECKSUM
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#define CC2420_CONF_CHECKSUM 0
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#endif /* CC2420_CONF_CHECKSUM */
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#ifndef CC2420_CONF_CHANNEL
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#define CC2420_CONF_CHANNEL 26
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#endif /* CC2420_CONF_CHANNEL */
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#ifndef CC2420_CONF_CCA_THRESH
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#define CC2420_CONF_CCA_THRESH -45
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#endif /* CC2420_CONF_CCA_THRESH */
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#ifndef CC2420_CONF_AUTOACK
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#define CC2420_CONF_AUTOACK 0
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#endif /* CC2420_CONF_AUTOACK */
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#if CC2420_CONF_CHECKSUM
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#include "lib/crc16.h"
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#define CHECKSUM_LEN 2
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#else
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#define CHECKSUM_LEN 0
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#endif /* CC2420_CONF_CHECKSUM */
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#define AUX_LEN (CHECKSUM_LEN + FOOTER_LEN)
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#define FOOTER1_CRC_OK 0x80
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#define FOOTER1_CORRELATION 0x7f
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...) do {} while (0)
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#endif
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#define DEBUG_LEDS DEBUG
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#undef LEDS_ON
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#undef LEDS_OFF
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#if DEBUG_LEDS
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#define LEDS_ON(x) leds_on(x)
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#define LEDS_OFF(x) leds_off(x)
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#else
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#define LEDS_ON(x)
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#define LEDS_OFF(x)
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#endif
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void cc2420_arch_init(void);
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/* XXX hack: these will be made as Chameleon packet attributes */
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rtimer_clock_t cc2420_time_of_arrival, cc2420_time_of_departure;
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int cc2420_authority_level_of_sender;
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int cc2420_packets_seen, cc2420_packets_read;
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static uint8_t volatile pending;
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#define BUSYWAIT_UNTIL(cond, max_time) \
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do { \
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rtimer_clock_t t0; \
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t0 = RTIMER_NOW(); \
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while(!(cond) && RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + (max_time))); \
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} while(0)
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volatile uint8_t cc2420_sfd_counter;
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volatile uint16_t cc2420_sfd_start_time;
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volatile uint16_t cc2420_sfd_end_time;
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static volatile uint16_t last_packet_timestamp;
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/*---------------------------------------------------------------------------*/
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PROCESS(cc2420_process, "CC2420 driver");
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/*---------------------------------------------------------------------------*/
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int cc2420_on(void);
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int cc2420_off(void);
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static int cc2420_read(void *buf, unsigned short bufsize);
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static int cc2420_prepare(const void *data, unsigned short len);
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static int cc2420_transmit(unsigned short len);
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static int cc2420_send(const void *data, unsigned short len);
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static int cc2420_receiving_packet(void);
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static int pending_packet(void);
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static int cc2420_cca(void);
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/*static int detected_energy(void);*/
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signed char cc2420_last_rssi;
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uint8_t cc2420_last_correlation;
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const struct radio_driver cc2420_driver =
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{
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cc2420_init,
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cc2420_prepare,
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cc2420_transmit,
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cc2420_send,
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cc2420_read,
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/* cc2420_set_channel, */
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/* detected_energy, */
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cc2420_cca,
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cc2420_receiving_packet,
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pending_packet,
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cc2420_on,
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cc2420_off,
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};
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static uint8_t receive_on;
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static int channel;
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/*---------------------------------------------------------------------------*/
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static void
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getrxdata(void *buf, int len)
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{
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CC2420_READ_FIFO_BUF(buf, len);
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}
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static void
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getrxbyte(uint8_t *byte)
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{
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CC2420_READ_FIFO_BYTE(*byte);
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}
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static void
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flushrx(void)
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{
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uint8_t dummy;
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CC2420_READ_FIFO_BYTE(dummy);
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CC2420_STROBE(CC2420_SFLUSHRX);
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CC2420_STROBE(CC2420_SFLUSHRX);
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}
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/*---------------------------------------------------------------------------*/
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static void
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strobe(enum cc2420_register regname)
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{
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CC2420_STROBE(regname);
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}
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/*---------------------------------------------------------------------------*/
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static unsigned int
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status(void)
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{
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uint8_t status;
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CC2420_GET_STATUS(status);
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return status;
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}
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/*---------------------------------------------------------------------------*/
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static uint8_t locked, lock_on, lock_off;
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static void
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on(void)
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{
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CC2420_ENABLE_FIFOP_INT();
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strobe(CC2420_SRXON);
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BUSYWAIT_UNTIL(status() & (BV(CC2420_XOSC16M_STABLE)), RTIMER_SECOND / 100);
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ENERGEST_ON(ENERGEST_TYPE_LISTEN);
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receive_on = 1;
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}
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static void
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off(void)
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{
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/* PRINTF("off\n");*/
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receive_on = 0;
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/* Wait for transmission to end before turning radio off. */
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BUSYWAIT_UNTIL(!(status() & BV(CC2420_TX_ACTIVE)), RTIMER_SECOND / 10);
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ENERGEST_OFF(ENERGEST_TYPE_LISTEN);
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strobe(CC2420_SRFOFF);
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CC2420_DISABLE_FIFOP_INT();
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if(!CC2420_FIFOP_IS_1) {
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flushrx();
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}
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}
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/*---------------------------------------------------------------------------*/
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#define GET_LOCK() locked++
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static void RELEASE_LOCK(void) {
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if(locked == 1) {
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if(lock_on) {
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on();
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lock_on = 0;
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}
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if(lock_off) {
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off();
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lock_off = 0;
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}
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}
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locked--;
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}
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/*---------------------------------------------------------------------------*/
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static unsigned
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getreg(enum cc2420_register regname)
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{
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unsigned reg;
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CC2420_READ_REG(regname, reg);
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return reg;
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}
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/*---------------------------------------------------------------------------*/
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static void
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setreg(enum cc2420_register regname, unsigned value)
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{
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CC2420_WRITE_REG(regname, value);
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}
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/*---------------------------------------------------------------------------*/
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static void
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set_txpower(uint8_t power)
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{
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uint16_t reg;
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reg = getreg(CC2420_TXCTRL);
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reg = (reg & 0xffe0) | (power & 0x1f);
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setreg(CC2420_TXCTRL, reg);
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}
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/*---------------------------------------------------------------------------*/
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#define AUTOACK (1 << 4)
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#define ADR_DECODE (1 << 11)
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#define RXFIFO_PROTECTION (1 << 9)
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#define CORR_THR(n) (((n) & 0x1f) << 6)
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#define FIFOP_THR(n) ((n) & 0x7f)
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#define RXBPF_LOCUR (1 << 13);
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/*---------------------------------------------------------------------------*/
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int
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cc2420_init(void)
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{
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uint16_t reg;
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{
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int s = splhigh();
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cc2420_arch_init(); /* Initalize ports and SPI. */
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CC2420_DISABLE_FIFOP_INT();
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CC2420_FIFOP_INT_INIT();
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splx(s);
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}
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/* Turn on voltage regulator and reset. */
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SET_VREG_ACTIVE();
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clock_delay(250);
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SET_RESET_ACTIVE();
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clock_delay(127);
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SET_RESET_INACTIVE();
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clock_delay(125);
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/* Turn on the crystal oscillator. */
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strobe(CC2420_SXOSCON);
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/* Turn on/off automatic packet acknowledgment and address decoding. */
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reg = getreg(CC2420_MDMCTRL0);
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#if CC2420_CONF_AUTOACK
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reg |= AUTOACK | ADR_DECODE;
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#else
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reg &= ~(AUTOACK | ADR_DECODE);
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#endif /* CC2420_CONF_AUTOACK */
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setreg(CC2420_MDMCTRL0, reg);
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/* Set transmission turnaround time to the lower setting (8 symbols
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= 0.128 ms) instead of the default (12 symbols = 0.192 ms). */
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/* reg = getreg(CC2420_TXCTRL);
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reg &= ~(1 << 13);
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setreg(CC2420_TXCTRL, reg);*/
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/* Change default values as recomended in the data sheet, */
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/* correlation threshold = 20, RX bandpass filter = 1.3uA. */
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setreg(CC2420_MDMCTRL1, CORR_THR(20));
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reg = getreg(CC2420_RXCTRL1);
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reg |= RXBPF_LOCUR;
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setreg(CC2420_RXCTRL1, reg);
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/* Set the FIFOP threshold to maximum. */
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setreg(CC2420_IOCFG0, FIFOP_THR(127));
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/* Turn off "Security enable" (page 32). */
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reg = getreg(CC2420_SECCTRL0);
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reg &= ~RXFIFO_PROTECTION;
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setreg(CC2420_SECCTRL0, reg);
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cc2420_set_pan_addr(0xffff, 0x0000, NULL);
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cc2420_set_channel(CC2420_CONF_CHANNEL);
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cc2420_set_cca_threshold(CC2420_CONF_CCA_THRESH);
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flushrx();
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process_start(&cc2420_process, NULL);
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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static int
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cc2420_transmit(unsigned short payload_len)
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{
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int i, txpower;
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uint8_t total_len;
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#if CC2420_CONF_CHECKSUM
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uint16_t checksum;
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#endif /* CC2420_CONF_CHECKSUM */
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GET_LOCK();
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txpower = 0;
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if(packetbuf_attr(PACKETBUF_ATTR_RADIO_TXPOWER) > 0) {
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/* Remember the current transmission power */
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txpower = cc2420_get_txpower();
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/* Set the specified transmission power */
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set_txpower(packetbuf_attr(PACKETBUF_ATTR_RADIO_TXPOWER) - 1);
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}
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total_len = payload_len + AUX_LEN;
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/* The TX FIFO can only hold one packet. Make sure to not overrun
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* FIFO by waiting for transmission to start here and synchronizing
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* with the CC2420_TX_ACTIVE check in cc2420_send.
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*
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* Note that we may have to wait up to 320 us (20 symbols) before
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* transmission starts.
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*/
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#ifndef CC2420_CONF_SYMBOL_LOOP_COUNT
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#error CC2420_CONF_SYMBOL_LOOP_COUNT needs to be set!!!
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#else
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#define LOOP_20_SYMBOLS CC2420_CONF_SYMBOL_LOOP_COUNT
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#endif
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#if WITH_SEND_CCA
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strobe(CC2420_SRXON);
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BUSYWAIT_UNTIL(status() & BV(CC2420_RSSI_VALID), RTIMER_SECOND / 10);
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strobe(CC2420_STXONCCA);
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#else /* WITH_SEND_CCA */
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strobe(CC2420_STXON);
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#endif /* WITH_SEND_CCA */
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for(i = LOOP_20_SYMBOLS; i > 0; i--) {
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if(CC2420_SFD_IS_1) {
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{
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rtimer_clock_t sfd_timestamp;
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sfd_timestamp = cc2420_sfd_start_time;
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if(packetbuf_attr(PACKETBUF_ATTR_PACKET_TYPE) ==
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PACKETBUF_ATTR_PACKET_TYPE_TIMESTAMP) {
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/* Write timestamp to last two bytes of packet in TXFIFO. */
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CC2420_WRITE_RAM(&sfd_timestamp, CC2420RAM_TXFIFO + payload_len - 1, 2);
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}
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}
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if(!(status() & BV(CC2420_TX_ACTIVE))) {
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/* SFD went high but we are not transmitting. This means that
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we just started receiving a packet, so we drop the
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transmission. */
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RELEASE_LOCK();
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return RADIO_TX_COLLISION;
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}
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if(receive_on) {
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ENERGEST_OFF(ENERGEST_TYPE_LISTEN);
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}
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ENERGEST_ON(ENERGEST_TYPE_TRANSMIT);
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/* We wait until transmission has ended so that we get an
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accurate measurement of the transmission time.*/
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BUSYWAIT_UNTIL(!(status() & BV(CC2420_TX_ACTIVE)), RTIMER_SECOND / 10);
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#ifdef ENERGEST_CONF_LEVELDEVICE_LEVELS
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ENERGEST_OFF_LEVEL(ENERGEST_TYPE_TRANSMIT,cc2420_get_txpower());
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#endif
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ENERGEST_OFF(ENERGEST_TYPE_TRANSMIT);
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if(receive_on) {
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ENERGEST_ON(ENERGEST_TYPE_LISTEN);
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} else {
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/* We need to explicitly turn off the radio,
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* since STXON[CCA] -> TX_ACTIVE -> RX_ACTIVE */
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off();
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}
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if(packetbuf_attr(PACKETBUF_ATTR_RADIO_TXPOWER) > 0) {
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/* Restore the transmission power */
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set_txpower(txpower & 0xff);
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}
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RELEASE_LOCK();
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return RADIO_TX_OK;
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}
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}
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/* If we are using WITH_SEND_CCA, we get here if the packet wasn't
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transmitted because of other channel activity. */
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RIMESTATS_ADD(contentiondrop);
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PRINTF("cc2420: do_send() transmission never started\n");
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if(packetbuf_attr(PACKETBUF_ATTR_RADIO_TXPOWER) > 0) {
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/* Restore the transmission power */
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set_txpower(txpower & 0xff);
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}
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RELEASE_LOCK();
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return RADIO_TX_COLLISION;
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}
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/*---------------------------------------------------------------------------*/
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static int
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cc2420_prepare(const void *payload, unsigned short payload_len)
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{
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uint8_t total_len;
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#if CC2420_CONF_CHECKSUM
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uint16_t checksum;
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#endif /* CC2420_CONF_CHECKSUM */
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GET_LOCK();
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PRINTF("cc2420: sending %d bytes\n", payload_len);
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RIMESTATS_ADD(lltx);
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/* Wait for any previous transmission to finish. */
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/* while(status() & BV(CC2420_TX_ACTIVE));*/
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/* Write packet to TX FIFO. */
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strobe(CC2420_SFLUSHTX);
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#if CC2420_CONF_CHECKSUM
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checksum = crc16_data(payload, payload_len, 0);
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#endif /* CC2420_CONF_CHECKSUM */
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total_len = payload_len + AUX_LEN;
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CC2420_WRITE_FIFO_BUF(&total_len, 1);
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CC2420_WRITE_FIFO_BUF(payload, payload_len);
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#if CC2420_CONF_CHECKSUM
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CC2420_WRITE_FIFO_BUF(&checksum, CHECKSUM_LEN);
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#endif /* CC2420_CONF_CHECKSUM */
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RELEASE_LOCK();
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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cc2420_send(const void *payload, unsigned short payload_len)
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{
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cc2420_prepare(payload, payload_len);
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return cc2420_transmit(payload_len);
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}
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/*---------------------------------------------------------------------------*/
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int
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cc2420_off(void)
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{
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/* Don't do anything if we are already turned off. */
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if(receive_on == 0) {
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return 1;
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}
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/* If we are called when the driver is locked, we indicate that the
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radio should be turned off when the lock is unlocked. */
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if(locked) {
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/* printf("Off when locked (%d)\n", locked);*/
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lock_off = 1;
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return 1;
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}
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GET_LOCK();
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/* If we are currently receiving a packet (indicated by SFD == 1),
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we don't actually switch the radio off now, but signal that the
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driver should switch off the radio once the packet has been
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received and processed, by setting the 'lock_off' variable. */
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if(status() & BV(CC2420_TX_ACTIVE)) {
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lock_off = 1;
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} else {
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off();
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}
|
|
RELEASE_LOCK();
|
|
return 1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
int
|
|
cc2420_on(void)
|
|
{
|
|
if(receive_on) {
|
|
return 1;
|
|
}
|
|
if(locked) {
|
|
lock_on = 1;
|
|
return 1;
|
|
}
|
|
|
|
GET_LOCK();
|
|
on();
|
|
RELEASE_LOCK();
|
|
return 1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
int
|
|
cc2420_get_channel(void)
|
|
{
|
|
return channel;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
int
|
|
cc2420_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 = 5 * (c - 11) + 357 + 0x4000;
|
|
/*
|
|
* Writing RAM requires crystal oscillator to be stable.
|
|
*/
|
|
BUSYWAIT_UNTIL((status() & (BV(CC2420_XOSC16M_STABLE))), RTIMER_SECOND / 10);
|
|
|
|
/* Wait for any transmission to end. */
|
|
BUSYWAIT_UNTIL(!(status() & BV(CC2420_TX_ACTIVE)), RTIMER_SECOND / 10);
|
|
|
|
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);
|
|
}
|
|
|
|
RELEASE_LOCK();
|
|
return 1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
cc2420_set_pan_addr(unsigned pan,
|
|
unsigned addr,
|
|
const uint8_t *ieee_addr)
|
|
{
|
|
uint16_t f = 0;
|
|
uint8_t tmp[2];
|
|
|
|
GET_LOCK();
|
|
|
|
/*
|
|
* Writing RAM requires crystal oscillator to be stable.
|
|
*/
|
|
BUSYWAIT_UNTIL(status() & (BV(CC2420_XOSC16M_STABLE)), RTIMER_SECOND / 10);
|
|
|
|
tmp[0] = pan & 0xff;
|
|
tmp[1] = pan >> 8;
|
|
CC2420_WRITE_RAM(&tmp, CC2420RAM_PANID, 2);
|
|
|
|
tmp[0] = addr & 0xff;
|
|
tmp[1] = addr >> 8;
|
|
CC2420_WRITE_RAM(&tmp, CC2420RAM_SHORTADDR, 2);
|
|
if(ieee_addr != NULL) {
|
|
uint8_t tmp_addr[8];
|
|
/* LSB first, MSB last for 802.15.4 addresses in CC2420 */
|
|
for (f = 0; f < 8; f++) {
|
|
tmp_addr[7 - f] = ieee_addr[f];
|
|
}
|
|
CC2420_WRITE_RAM(tmp_addr, CC2420RAM_IEEEADDR, 8);
|
|
}
|
|
RELEASE_LOCK();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/*
|
|
* Interrupt leaves frame intact in FIFO.
|
|
*/
|
|
#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)
|
|
{
|
|
CC2420_CLEAR_FIFOP_INT();
|
|
process_poll(&cc2420_process);
|
|
#if CC2420_TIMETABLE_PROFILING
|
|
timetable_clear(&cc2420_timetable);
|
|
TIMETABLE_TIMESTAMP(cc2420_timetable, "interrupt");
|
|
#endif /* CC2420_TIMETABLE_PROFILING */
|
|
|
|
last_packet_timestamp = cc2420_sfd_start_time;
|
|
pending++;
|
|
cc2420_packets_seen++;
|
|
return 1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
PROCESS_THREAD(cc2420_process, ev, data)
|
|
{
|
|
int len;
|
|
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 */
|
|
|
|
PRINTF("cc2420_process: calling receiver callback\n");
|
|
|
|
packetbuf_clear();
|
|
packetbuf_set_attr(PACKETBUF_ATTR_TIMESTAMP, last_packet_timestamp);
|
|
len = cc2420_read(packetbuf_dataptr(), PACKETBUF_SIZE);
|
|
|
|
packetbuf_set_datalen(len);
|
|
|
|
NETSTACK_RDC.input();
|
|
#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 */
|
|
}
|
|
|
|
PROCESS_END();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static 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_FIFOP_IS_1) {
|
|
return 0;
|
|
}
|
|
/* if(!pending) {
|
|
return 0;
|
|
}*/
|
|
|
|
pending = 0;
|
|
|
|
GET_LOCK();
|
|
|
|
cc2420_packets_read++;
|
|
|
|
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 */
|
|
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);
|
|
|
|
} else {
|
|
RIMESTATS_ADD(badcrc);
|
|
len = AUX_LEN;
|
|
}
|
|
|
|
if(CC2420_FIFOP_IS_1) {
|
|
if(!CC2420_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(&cc2420_process);
|
|
}
|
|
}
|
|
|
|
RELEASE_LOCK();
|
|
|
|
if(len < AUX_LEN) {
|
|
return 0;
|
|
}
|
|
|
|
return len - AUX_LEN;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
cc2420_set_txpower(uint8_t power)
|
|
{
|
|
GET_LOCK();
|
|
set_txpower(power);
|
|
RELEASE_LOCK();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
int
|
|
cc2420_get_txpower(void)
|
|
{
|
|
int power;
|
|
GET_LOCK();
|
|
power = (int)(getreg(CC2420_TXCTRL) & 0x001f);
|
|
RELEASE_LOCK();
|
|
return power;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
int
|
|
cc2420_rssi(void)
|
|
{
|
|
int rssi;
|
|
int radio_was_off = 0;
|
|
|
|
if(locked) {
|
|
return 0;
|
|
}
|
|
|
|
GET_LOCK();
|
|
|
|
if(!receive_on) {
|
|
radio_was_off = 1;
|
|
cc2420_on();
|
|
}
|
|
BUSYWAIT_UNTIL(status() & BV(CC2420_RSSI_VALID), RTIMER_SECOND / 100);
|
|
|
|
rssi = (int)((signed char)getreg(CC2420_RSSI));
|
|
|
|
if(radio_was_off) {
|
|
cc2420_off();
|
|
}
|
|
RELEASE_LOCK();
|
|
return rssi;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/*
|
|
static int
|
|
detected_energy(void)
|
|
{
|
|
return cc2420_rssi();
|
|
}
|
|
*/
|
|
/*---------------------------------------------------------------------------*/
|
|
int
|
|
cc2420_cca_valid(void)
|
|
{
|
|
int valid;
|
|
if(locked) {
|
|
return 1;
|
|
}
|
|
GET_LOCK();
|
|
valid = !!(status() & BV(CC2420_RSSI_VALID));
|
|
RELEASE_LOCK();
|
|
return valid;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
cc2420_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;
|
|
cc2420_on();
|
|
}
|
|
|
|
/* Make sure that the radio really got turned on. */
|
|
if(!receive_on) {
|
|
RELEASE_LOCK();
|
|
if(radio_was_off) {
|
|
cc2420_off();
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
BUSYWAIT_UNTIL(status() & BV(CC2420_RSSI_VALID), RTIMER_SECOND / 100);
|
|
|
|
cca = CC2420_CCA_IS_1;
|
|
|
|
if(radio_was_off) {
|
|
cc2420_off();
|
|
}
|
|
RELEASE_LOCK();
|
|
return cca;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
int
|
|
cc2420_receiving_packet(void)
|
|
{
|
|
return CC2420_SFD_IS_1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
pending_packet(void)
|
|
{
|
|
return CC2420_FIFOP_IS_1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
cc2420_set_cca_threshold(int value)
|
|
{
|
|
uint16_t shifted = value << 8;
|
|
GET_LOCK();
|
|
setreg(CC2420_RSSI, shifted);
|
|
RELEASE_LOCK();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|