mirror of
https://github.com/oliverschmidt/contiki.git
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1196 lines
30 KiB
C
1196 lines
30 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 "cc2420.h"
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#include "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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#define WITH_SEND_CCA 1
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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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#define CHECKSUM_LEN 2
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#define FOOTER_LEN 2
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#define FOOTER1_CRC_OK 0x80
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#define FOOTER1_CORRELATION 0x7f
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#ifdef CC2420_CONF_RSSI_OFFSET
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#define RSSI_OFFSET CC2420_CONF_RSSI_OFFSET
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#else /* CC2420_CONF_RSSI_OFFSET */
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/* The RSSI_OFFSET is approximate -45 (see CC2420 specification) */
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#define RSSI_OFFSET -45
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#endif /* CC2420_CONF_RSSI_OFFSET */
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enum write_ram_order {
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/* Begin with writing the first given byte */
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WRITE_RAM_IN_ORDER,
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/* Begin with writing the last given byte */
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WRITE_RAM_REVERSE
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};
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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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/* Conversion map between PA_LEVEL and output power in dBm
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(from table 9 in CC2420 specification).
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*/
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struct output_config {
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int8_t power;
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uint8_t config;
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};
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static const struct output_config output_power[] = {
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{ 0, 31 }, /* 0xff */
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{ -1, 27 }, /* 0xfb */
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{ -3, 23 }, /* 0xf7 */
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{ -5, 19 }, /* 0xf3 */
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{ -7, 15 }, /* 0xef */
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{-10, 11 }, /* 0xeb */
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{-15, 7 }, /* 0xe7 */
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{-25, 3 }, /* 0xe3 */
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};
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#define OUTPUT_NUM (sizeof(output_power) / sizeof(struct output_config))
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#define OUTPUT_POWER_MAX 0
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#define OUTPUT_POWER_MIN -25
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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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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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#define AUTOACK (1 << 4)
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#define AUTOCRC (1 << 5)
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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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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 get_cca_threshold(void);
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static int cc2420_cca(void);
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static uint16_t getreg(enum cc2420_register regname);
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static void set_frame_filtering(uint8_t enable);
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static void set_poll_mode(uint8_t enable);
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static void set_send_on_cca(uint8_t enable);
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static void set_auto_ack(uint8_t enable);
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signed char cc2420_last_rssi;
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uint8_t cc2420_last_correlation;
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static uint8_t receive_on;
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static int channel;
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/* Are we currently in poll mode? */
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static uint8_t volatile poll_mode = 0;
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/* Do we perform a CCA before sending? */
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static uint8_t send_on_cca = WITH_SEND_CCA;
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static radio_result_t
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get_value(radio_param_t param, radio_value_t *value)
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{
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int i, v;
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if(!value) {
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return RADIO_RESULT_INVALID_VALUE;
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}
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switch(param) {
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case RADIO_PARAM_POWER_MODE:
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*value = receive_on ? RADIO_POWER_MODE_ON : RADIO_POWER_MODE_OFF;
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return RADIO_RESULT_OK;
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case RADIO_PARAM_CHANNEL:
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*value = cc2420_get_channel();
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return RADIO_RESULT_OK;
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case RADIO_PARAM_RX_MODE:
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*value = 0;
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if(getreg(CC2420_MDMCTRL0) & ADR_DECODE) {
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*value |= RADIO_RX_MODE_ADDRESS_FILTER;
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}
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if(getreg(CC2420_MDMCTRL0) & AUTOACK) {
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*value |= RADIO_RX_MODE_AUTOACK;
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}
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if(poll_mode) {
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*value |= RADIO_RX_MODE_POLL_MODE;
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}
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return RADIO_RESULT_OK;
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case RADIO_PARAM_TX_MODE:
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*value = 0;
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if(send_on_cca) {
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*value |= RADIO_TX_MODE_SEND_ON_CCA;
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}
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return RADIO_RESULT_OK;
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case RADIO_PARAM_TXPOWER:
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v = cc2420_get_txpower();
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*value = OUTPUT_POWER_MIN;
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/* Find the actual estimated output power in conversion table */
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for(i = 0; i < OUTPUT_NUM; i++) {
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if(v >= output_power[i].config) {
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*value = output_power[i].power;
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break;
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}
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}
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return RADIO_RESULT_OK;
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case RADIO_PARAM_CCA_THRESHOLD:
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*value = get_cca_threshold() + RSSI_OFFSET;
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return RADIO_RESULT_OK;
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case RADIO_PARAM_RSSI:
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/* Return the RSSI value in dBm */
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*value = cc2420_rssi();
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return RADIO_RESULT_OK;
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case RADIO_PARAM_LAST_RSSI:
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/* RSSI of the last packet received */
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*value = cc2420_last_rssi;
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return RADIO_RESULT_OK;
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case RADIO_PARAM_LAST_LINK_QUALITY:
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/* LQI of the last packet received */
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*value = cc2420_last_correlation;
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return RADIO_RESULT_OK;
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case RADIO_CONST_CHANNEL_MIN:
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*value = 11;
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return RADIO_RESULT_OK;
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case RADIO_CONST_CHANNEL_MAX:
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*value = 26;
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return RADIO_RESULT_OK;
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case RADIO_CONST_TXPOWER_MIN:
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*value = OUTPUT_POWER_MIN;
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return RADIO_RESULT_OK;
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case RADIO_CONST_TXPOWER_MAX:
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*value = OUTPUT_POWER_MAX;
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return RADIO_RESULT_OK;
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default:
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return RADIO_RESULT_NOT_SUPPORTED;
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}
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}
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static radio_result_t
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set_value(radio_param_t param, radio_value_t value)
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{
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int i;
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switch(param) {
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case RADIO_PARAM_POWER_MODE:
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if(value == RADIO_POWER_MODE_ON) {
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cc2420_on();
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return RADIO_RESULT_OK;
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}
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if(value == RADIO_POWER_MODE_OFF) {
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cc2420_off();
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return RADIO_RESULT_OK;
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}
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return RADIO_RESULT_INVALID_VALUE;
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case RADIO_PARAM_CHANNEL:
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if(value < 11 || value > 26) {
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return RADIO_RESULT_INVALID_VALUE;
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}
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cc2420_set_channel(value);
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return RADIO_RESULT_OK;
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case RADIO_PARAM_RX_MODE:
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if(value & ~(RADIO_RX_MODE_ADDRESS_FILTER |
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RADIO_RX_MODE_AUTOACK | RADIO_RX_MODE_POLL_MODE)) {
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return RADIO_RESULT_INVALID_VALUE;
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}
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set_frame_filtering((value & RADIO_RX_MODE_ADDRESS_FILTER) != 0);
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set_auto_ack((value & RADIO_RX_MODE_AUTOACK) != 0);
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set_poll_mode((value & RADIO_RX_MODE_POLL_MODE) != 0);
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return RADIO_RESULT_OK;
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case RADIO_PARAM_TX_MODE:
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if(value & ~(RADIO_TX_MODE_SEND_ON_CCA)) {
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return RADIO_RESULT_INVALID_VALUE;
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}
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set_send_on_cca((value & RADIO_TX_MODE_SEND_ON_CCA) != 0);
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return RADIO_RESULT_OK;
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case RADIO_PARAM_TXPOWER:
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if(value < OUTPUT_POWER_MIN || value > OUTPUT_POWER_MAX) {
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return RADIO_RESULT_INVALID_VALUE;
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}
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/* Find the closest higher PA_LEVEL for the desired output power */
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for(i = 1; i < OUTPUT_NUM; i++) {
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if(value > output_power[i].power) {
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break;
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}
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}
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cc2420_set_txpower(output_power[i - 1].config);
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return RADIO_RESULT_OK;
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case RADIO_PARAM_CCA_THRESHOLD:
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cc2420_set_cca_threshold(value - RSSI_OFFSET);
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return RADIO_RESULT_OK;
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default:
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return RADIO_RESULT_NOT_SUPPORTED;
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}
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}
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static radio_result_t
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get_object(radio_param_t param, void *dest, size_t size)
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{
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if(param == RADIO_PARAM_LAST_PACKET_TIMESTAMP) {
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#if CC2420_CONF_SFD_TIMESTAMPS
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if(size != sizeof(rtimer_clock_t) || !dest) {
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return RADIO_RESULT_INVALID_VALUE;
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}
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*(rtimer_clock_t*)dest = cc2420_sfd_start_time;
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return RADIO_RESULT_OK;
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#else
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return RADIO_RESULT_NOT_SUPPORTED;
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#endif
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}
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return RADIO_RESULT_NOT_SUPPORTED;
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}
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static radio_result_t
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set_object(radio_param_t param, const void *src, size_t size)
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{
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return RADIO_RESULT_NOT_SUPPORTED;
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}
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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_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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get_value,
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set_value,
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get_object,
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set_object
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};
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/*---------------------------------------------------------------------------*/
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/* Sends a strobe */
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static void
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strobe(enum cc2420_register regname)
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{
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CC2420_SPI_ENABLE();
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SPI_WRITE(regname);
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CC2420_SPI_DISABLE();
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}
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/*---------------------------------------------------------------------------*/
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/* Reads a register */
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static uint16_t
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getreg(enum cc2420_register regname)
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{
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uint16_t value;
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CC2420_SPI_ENABLE();
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SPI_WRITE(regname | 0x40);
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value = (uint8_t)SPI_RXBUF;
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SPI_TXBUF = 0;
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SPI_WAITFOREORx();
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value = SPI_RXBUF << 8;
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SPI_TXBUF = 0;
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SPI_WAITFOREORx();
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value |= SPI_RXBUF;
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CC2420_SPI_DISABLE();
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return value;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* Writes to a register.
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* Note: the SPI_WRITE(0) seems to be needed for getting the
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* write reg working on the Z1 / MSP430X platform
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*/
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static void
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setreg(enum cc2420_register regname, uint16_t value)
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{
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CC2420_SPI_ENABLE();
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SPI_WRITE_FAST(regname);
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SPI_WRITE_FAST((uint8_t) (value >> 8));
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SPI_WRITE_FAST((uint8_t) (value & 0xff));
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SPI_WAITFORTx_ENDED();
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SPI_WRITE(0);
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CC2420_SPI_DISABLE();
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}
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/*---------------------------------------------------------------------------*/
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static void
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read_ram(uint8_t *buffer, uint16_t adr, uint16_t count)
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{
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uint8_t i;
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CC2420_SPI_ENABLE();
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SPI_WRITE(0x80 | ((adr) & 0x7f));
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SPI_WRITE((((adr) >> 1) & 0xc0) | 0x20);
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SPI_RXBUF;
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for(i = 0; i < count; i++) {
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SPI_READ(((uint8_t*) buffer)[i]);
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}
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CC2420_SPI_DISABLE();
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}
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/*---------------------------------------------------------------------------*/
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/* Write to RAM in the CC2420 */
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static void
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write_ram(const uint8_t *buffer,
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uint16_t adr,
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uint16_t count,
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enum write_ram_order order)
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{
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uint8_t i;
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CC2420_SPI_ENABLE();
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SPI_WRITE_FAST(0x80 | (adr & 0x7f));
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SPI_WRITE_FAST((adr >> 1) & 0xc0);
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if(order == WRITE_RAM_IN_ORDER) {
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for(i = 0; i < count; i++) {
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SPI_WRITE_FAST((buffer)[i]);
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}
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} else {
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for(i = count; i > 0; i--) {
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SPI_WRITE_FAST((buffer)[i - 1]);
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}
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}
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SPI_WAITFORTx_ENDED();
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CC2420_SPI_DISABLE();
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}
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/*---------------------------------------------------------------------------*/
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static void
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write_fifo_buf(const uint8_t *buffer, uint16_t count)
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{
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uint8_t i;
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CC2420_SPI_ENABLE();
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SPI_WRITE_FAST(CC2420_TXFIFO);
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for(i = 0; i < count; i++) {
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SPI_WRITE_FAST((buffer)[i]);
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}
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SPI_WAITFORTx_ENDED();
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CC2420_SPI_DISABLE();
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}
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/*---------------------------------------------------------------------------*/
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/* Returns the current status */
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static uint8_t
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get_status(void)
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{
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uint8_t status;
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CC2420_SPI_ENABLE();
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SPI_WRITE(CC2420_SNOP);
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status = SPI_RXBUF;
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CC2420_SPI_DISABLE();
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return status;
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}
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/*---------------------------------------------------------------------------*/
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static void
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getrxdata(uint8_t *buffer, int count)
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{
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uint8_t i;
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CC2420_SPI_ENABLE();
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SPI_WRITE(CC2420_RXFIFO | 0x40);
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(void) SPI_RXBUF;
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for(i = 0; i < count; i++) {
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SPI_READ(buffer[i]);
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}
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clock_delay(1);
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CC2420_SPI_DISABLE();
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}
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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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getrxdata(&dummy, 1);
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strobe(CC2420_SFLUSHRX);
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strobe(CC2420_SFLUSHRX);
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if(dummy) {
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/* avoid unused variable compiler warning */
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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wait_for_status(uint8_t status_bit)
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{
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rtimer_clock_t t0;
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t0 = RTIMER_NOW();
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while(!(get_status() & status_bit)
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&& RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + (RTIMER_SECOND / 10)));
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}
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/*---------------------------------------------------------------------------*/
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static void
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wait_for_transmission(void)
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{
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|
rtimer_clock_t t0;
|
|
t0 = RTIMER_NOW();
|
|
while((get_status() & BV(CC2420_TX_ACTIVE))
|
|
&& RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + (RTIMER_SECOND / 10)));
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
on(void)
|
|
{
|
|
if(!poll_mode) {
|
|
CC2420_ENABLE_FIFOP_INT();
|
|
}
|
|
|
|
strobe(CC2420_SRXON);
|
|
|
|
ENERGEST_ON(ENERGEST_TYPE_LISTEN);
|
|
receive_on = 1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
off(void)
|
|
{
|
|
/* PRINTF("off\n");*/
|
|
receive_on = 0;
|
|
|
|
/* Wait for transmission to end before turning radio off. */
|
|
wait_for_transmission();
|
|
|
|
ENERGEST_OFF(ENERGEST_TYPE_LISTEN);
|
|
strobe(CC2420_SRFOFF);
|
|
if(!poll_mode) {
|
|
CC2420_DISABLE_FIFOP_INT();
|
|
}
|
|
|
|
if(!CC2420_FIFOP_IS_1) {
|
|
flushrx();
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static uint8_t locked, lock_on, lock_off;
|
|
#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 void
|
|
init_security(void)
|
|
{
|
|
/* only use key 0 */
|
|
setreg(CC2420_SECCTRL0, 0);
|
|
setreg(CC2420_SECCTRL1, 0);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
set_key(const uint8_t *key)
|
|
{
|
|
GET_LOCK();
|
|
|
|
write_ram(key, CC2420RAM_KEY0, 16, WRITE_RAM_REVERSE);
|
|
|
|
RELEASE_LOCK();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
encrypt(uint8_t *plaintext_and_result)
|
|
{
|
|
GET_LOCK();
|
|
|
|
write_ram(plaintext_and_result,
|
|
CC2420RAM_SABUF,
|
|
16,
|
|
WRITE_RAM_IN_ORDER);
|
|
|
|
strobe(CC2420_SAES);
|
|
while(get_status() & BV(CC2420_ENC_BUSY));
|
|
|
|
read_ram(plaintext_and_result, CC2420RAM_SABUF, 16);
|
|
|
|
RELEASE_LOCK();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
const struct aes_128_driver cc2420_aes_128_driver = {
|
|
set_key,
|
|
encrypt
|
|
};
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
set_txpower(uint8_t power)
|
|
{
|
|
uint16_t reg;
|
|
|
|
reg = getreg(CC2420_TXCTRL);
|
|
reg = (reg & 0xffe0) | (power & 0x1f);
|
|
setreg(CC2420_TXCTRL, reg);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
int
|
|
cc2420_init(void)
|
|
{
|
|
uint16_t reg;
|
|
{
|
|
int s = splhigh();
|
|
cc2420_arch_init(); /* Initalize ports and SPI. */
|
|
CC2420_DISABLE_FIFOP_INT();
|
|
CC2420_FIFOP_INT_INIT();
|
|
splx(s);
|
|
}
|
|
|
|
/* Turn on voltage regulator and reset. */
|
|
SET_VREG_ACTIVE();
|
|
clock_delay(250);
|
|
SET_RESET_ACTIVE();
|
|
clock_delay(127);
|
|
SET_RESET_INACTIVE();
|
|
clock_delay(125);
|
|
|
|
|
|
/* Turn on the crystal oscillator. */
|
|
strobe(CC2420_SXOSCON);
|
|
/* And wait until it stabilizes */
|
|
wait_for_status(BV(CC2420_XOSC16M_STABLE));
|
|
|
|
/* Set auto-ack and frame filtering */
|
|
set_auto_ack(CC2420_CONF_AUTOACK);
|
|
set_frame_filtering(CC2420_CONF_AUTOACK);
|
|
|
|
/* Enabling CRC in hardware; this is required by AUTOACK anyway
|
|
and provides us with RSSI and link quality indication (LQI)
|
|
information. */
|
|
reg = getreg(CC2420_MDMCTRL0);
|
|
reg |= AUTOCRC;
|
|
setreg(CC2420_MDMCTRL0, reg);
|
|
|
|
/* Set transmission turnaround time to the lower setting (8 symbols
|
|
= 0.128 ms) instead of the default (12 symbols = 0.192 ms). */
|
|
/* reg = getreg(CC2420_TXCTRL);
|
|
reg &= ~(1 << 13);
|
|
setreg(CC2420_TXCTRL, 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));
|
|
|
|
init_security();
|
|
|
|
cc2420_set_pan_addr(0xffff, 0x0000, NULL);
|
|
cc2420_set_channel(CC2420_CONF_CHANNEL);
|
|
cc2420_set_cca_threshold(CC2420_CONF_CCA_THRESH);
|
|
|
|
flushrx();
|
|
|
|
set_poll_mode(0);
|
|
|
|
process_start(&cc2420_process, NULL);
|
|
return 1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
cc2420_transmit(unsigned short payload_len)
|
|
{
|
|
int i, txpower;
|
|
|
|
GET_LOCK();
|
|
|
|
txpower = 0;
|
|
if(packetbuf_attr(PACKETBUF_ATTR_RADIO_TXPOWER) > 0) {
|
|
/* Remember the current transmission power */
|
|
txpower = cc2420_get_txpower();
|
|
/* Set the specified transmission power */
|
|
set_txpower(packetbuf_attr(PACKETBUF_ATTR_RADIO_TXPOWER) - 1);
|
|
}
|
|
|
|
/* 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.
|
|
*/
|
|
#ifndef CC2420_CONF_SYMBOL_LOOP_COUNT
|
|
#error CC2420_CONF_SYMBOL_LOOP_COUNT needs to be set!!!
|
|
#else
|
|
#define LOOP_20_SYMBOLS CC2420_CONF_SYMBOL_LOOP_COUNT
|
|
#endif
|
|
|
|
if(send_on_cca) {
|
|
strobe(CC2420_SRXON);
|
|
wait_for_status(BV(CC2420_RSSI_VALID));
|
|
strobe(CC2420_STXONCCA);
|
|
} else {
|
|
strobe(CC2420_STXON);
|
|
}
|
|
for(i = LOOP_20_SYMBOLS; i > 0; i--) {
|
|
if(CC2420_SFD_IS_1) {
|
|
#if PACKETBUF_WITH_PACKET_TYPE
|
|
{
|
|
rtimer_clock_t sfd_timestamp;
|
|
sfd_timestamp = cc2420_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. */
|
|
write_ram((uint8_t *) &sfd_timestamp, CC2420RAM_TXFIFO + payload_len - 1, 2, WRITE_RAM_IN_ORDER);
|
|
}
|
|
}
|
|
#endif /* PACKETBUF_WITH_PACKET_TYPE */
|
|
|
|
if(!(get_status() & BV(CC2420_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.*/
|
|
wait_for_transmission();
|
|
|
|
#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);
|
|
} 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();
|
|
return RADIO_TX_OK;
|
|
}
|
|
}
|
|
|
|
/* If we send with cca (cca_on_send), 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");
|
|
|
|
if(packetbuf_attr(PACKETBUF_ATTR_RADIO_TXPOWER) > 0) {
|
|
/* Restore the transmission power */
|
|
set_txpower(txpower & 0xff);
|
|
}
|
|
|
|
RELEASE_LOCK();
|
|
return RADIO_TX_COLLISION;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
cc2420_prepare(const void *payload, unsigned short payload_len)
|
|
{
|
|
uint8_t total_len;
|
|
|
|
GET_LOCK();
|
|
|
|
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);
|
|
|
|
total_len = payload_len + CHECKSUM_LEN;
|
|
write_fifo_buf(&total_len, 1);
|
|
write_fifo_buf(payload, payload_len);
|
|
|
|
RELEASE_LOCK();
|
|
return 0;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
cc2420_send(const void *payload, unsigned short payload_len)
|
|
{
|
|
cc2420_prepare(payload, payload_len);
|
|
return cc2420_transmit(payload_len);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
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) {
|
|
/* printf("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(get_status() & BV(CC2420_TX_ACTIVE)) {
|
|
lock_off = 1;
|
|
} else {
|
|
off();
|
|
}
|
|
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;
|
|
|
|
/* Wait for any transmission to end. */
|
|
wait_for_transmission();
|
|
|
|
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)
|
|
{
|
|
GET_LOCK();
|
|
|
|
write_ram((uint8_t *) &pan, CC2420RAM_PANID, 2, WRITE_RAM_IN_ORDER);
|
|
write_ram((uint8_t *) &addr, CC2420RAM_SHORTADDR, 2, WRITE_RAM_IN_ORDER);
|
|
|
|
if(ieee_addr != NULL) {
|
|
write_ram(ieee_addr, CC2420RAM_IEEEADDR, 8, WRITE_RAM_REVERSE);
|
|
}
|
|
RELEASE_LOCK();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/*
|
|
* Interrupt leaves frame intact in FIFO.
|
|
*/
|
|
int
|
|
cc2420_interrupt(void)
|
|
{
|
|
CC2420_CLEAR_FIFOP_INT();
|
|
process_poll(&cc2420_process);
|
|
|
|
last_packet_timestamp = cc2420_sfd_start_time;
|
|
return 1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
PROCESS_THREAD(cc2420_process, ev, data)
|
|
{
|
|
int len;
|
|
PROCESS_BEGIN();
|
|
|
|
PRINTF("cc2420_process: started\n");
|
|
|
|
while(1) {
|
|
PROCESS_YIELD_UNTIL(!poll_mode && ev == PROCESS_EVENT_POLL);
|
|
|
|
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();
|
|
}
|
|
|
|
PROCESS_END();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
cc2420_read(void *buf, unsigned short bufsize)
|
|
{
|
|
uint8_t footer[FOOTER_LEN];
|
|
uint8_t len;
|
|
|
|
if(!CC2420_FIFOP_IS_1) {
|
|
return 0;
|
|
}
|
|
|
|
GET_LOCK();
|
|
|
|
getrxdata(&len, 1);
|
|
|
|
if(len > CC2420_MAX_PACKET_LEN) {
|
|
/* Oops, we must be out of sync. */
|
|
RIMESTATS_ADD(badsynch);
|
|
} else if(len <= FOOTER_LEN) {
|
|
RIMESTATS_ADD(tooshort);
|
|
} else if(len - FOOTER_LEN > bufsize) {
|
|
RIMESTATS_ADD(toolong);
|
|
} else {
|
|
getrxdata((uint8_t *) buf, len - FOOTER_LEN);
|
|
getrxdata(footer, FOOTER_LEN);
|
|
|
|
if(footer[1] & FOOTER1_CRC_OK) {
|
|
cc2420_last_rssi = footer[0] + RSSI_OFFSET;
|
|
cc2420_last_correlation = footer[1] & FOOTER1_CORRELATION;
|
|
if(!poll_mode) {
|
|
/* Not in poll mode: packetbuf should not be accessed in interrupt context.
|
|
* In poll mode, the last packet RSSI and link quality can be obtained through
|
|
* RADIO_PARAM_LAST_RSSI and RADIO_PARAM_LAST_LINK_QUALITY */
|
|
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 = FOOTER_LEN;
|
|
}
|
|
|
|
if(!poll_mode) {
|
|
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();
|
|
return len - FOOTER_LEN;
|
|
}
|
|
|
|
flushrx();
|
|
RELEASE_LOCK();
|
|
return 0;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
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();
|
|
}
|
|
wait_for_status(BV(CC2420_RSSI_VALID));
|
|
|
|
rssi = (int)((signed char) getreg(CC2420_RSSI));
|
|
rssi += RSSI_OFFSET;
|
|
|
|
if(radio_was_off) {
|
|
cc2420_off();
|
|
}
|
|
RELEASE_LOCK();
|
|
return rssi;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
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;
|
|
}
|
|
|
|
wait_for_status(BV(CC2420_RSSI_VALID));
|
|
|
|
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;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
get_cca_threshold(void)
|
|
{
|
|
int value;
|
|
|
|
GET_LOCK();
|
|
value = (int8_t)(getreg(CC2420_RSSI) >> 8);
|
|
RELEASE_LOCK();
|
|
return value;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
cc2420_set_cca_threshold(int value)
|
|
{
|
|
uint16_t shifted = value << 8;
|
|
GET_LOCK();
|
|
setreg(CC2420_RSSI, shifted);
|
|
RELEASE_LOCK();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/* Set or unset frame autoack */
|
|
static void
|
|
set_auto_ack(uint8_t enable)
|
|
{
|
|
GET_LOCK();
|
|
|
|
uint16_t reg = getreg(CC2420_MDMCTRL0);
|
|
if(enable) {
|
|
reg |= AUTOACK;
|
|
} else {
|
|
reg &= ~(AUTOACK);
|
|
}
|
|
|
|
setreg(CC2420_MDMCTRL0, reg);
|
|
RELEASE_LOCK();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/* Set or unset frame filtering */
|
|
static void
|
|
set_frame_filtering(uint8_t enable)
|
|
{
|
|
GET_LOCK();
|
|
|
|
/* Turn on/off address decoding. */
|
|
uint16_t reg = getreg(CC2420_MDMCTRL0);
|
|
if(enable) {
|
|
reg |= ADR_DECODE;
|
|
} else {
|
|
reg &= ~(ADR_DECODE);
|
|
}
|
|
|
|
setreg(CC2420_MDMCTRL0, reg);
|
|
RELEASE_LOCK();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/* Enable or disable radio interrupts (both FIFOP and SFD timer capture) */
|
|
static void
|
|
set_poll_mode(uint8_t enable)
|
|
{
|
|
GET_LOCK();
|
|
poll_mode = enable;
|
|
if(enable) {
|
|
/* Disable FIFOP interrupt */
|
|
CC2420_CLEAR_FIFOP_INT();
|
|
CC2420_DISABLE_FIFOP_INT();
|
|
} else {
|
|
/* Initialize and enable FIFOP interrupt */
|
|
CC2420_FIFOP_INT_INIT();
|
|
CC2420_ENABLE_FIFOP_INT();
|
|
CC2420_CLEAR_FIFOP_INT();
|
|
}
|
|
RELEASE_LOCK();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/* Enable or disable CCA before sending */
|
|
static void
|
|
set_send_on_cca(uint8_t enable)
|
|
{
|
|
send_on_cca = enable;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|