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264 lines
6.7 KiB
C
264 lines
6.7 KiB
C
/*
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* Copyright (c) 2010, 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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* $Id: cooja-radio.c,v 1.15 2010/06/14 19:19:17 adamdunkels Exp $
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*/
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#include <stdio.h>
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#include <string.h>
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#include "contiki.h"
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#include "sys/cooja_mt.h"
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#include "lib/simEnvChange.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 "dev/radio.h"
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#include "dev/cooja-radio.h"
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#define COOJA_RADIO_BUFSIZE PACKETBUF_SIZE
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#define CCA_SS_THRESHOLD -95
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const struct simInterface radio_interface;
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/* COOJA */
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char simReceiving = 0;
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char simInDataBuffer[COOJA_RADIO_BUFSIZE];
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int simInSize = 0;
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char simOutDataBuffer[COOJA_RADIO_BUFSIZE];
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int simOutSize = 0;
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char simRadioHWOn = 1;
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int simSignalStrength = -100;
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int simLastSignalStrength = -100;
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char simPower = 100;
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int simRadioChannel = 26;
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static const void *pending_data;
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PROCESS(cooja_radio_process, "cooja radio process");
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/*---------------------------------------------------------------------------*/
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void
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radio_set_channel(int channel)
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{
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simRadioChannel = channel;
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}
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/*---------------------------------------------------------------------------*/
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void
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radio_set_txpower(unsigned char power)
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{
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/* 1 - 100: Number indicating output power */
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simPower = power;
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}
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/*---------------------------------------------------------------------------*/
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int
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radio_signal_strength_last(void)
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{
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return simLastSignalStrength;
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}
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/*---------------------------------------------------------------------------*/
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int
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radio_signal_strength_current(void)
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{
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return simSignalStrength;
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}
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/*---------------------------------------------------------------------------*/
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static int
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radio_on(void)
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{
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simRadioHWOn = 1;
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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static int
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radio_off(void)
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{
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simRadioHWOn = 0;
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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static void
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doInterfaceActionsBeforeTick(void)
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{
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if (!simRadioHWOn) {
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simInSize = 0;
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return;
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}
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if (simReceiving) {
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simLastSignalStrength = simSignalStrength;
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return;
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}
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if (simInSize > 0) {
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process_poll(&cooja_radio_process);
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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doInterfaceActionsAfterTick(void)
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{
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}
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/*---------------------------------------------------------------------------*/
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static int
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radio_read(void *buf, unsigned short bufsize)
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{
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int tmp = simInSize;
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if (simInSize == 0) {
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return 0;
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}
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if(bufsize < simInSize) {
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simInSize = 0; /* rx flush */
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RIMESTATS_ADD(toolong);
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return 0;
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}
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memcpy(buf, simInDataBuffer, simInSize);
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simInSize = 0;
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return tmp;
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}
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/*---------------------------------------------------------------------------*/
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static int
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radio_send(const void *payload, unsigned short payload_len)
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{
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int radiostate = simRadioHWOn;
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if(!simRadioHWOn) {
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/* Turn on radio temporarily */
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simRadioHWOn = 1;
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}
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if(payload_len > COOJA_RADIO_BUFSIZE) {
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return RADIO_TX_ERR;
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}
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if(payload_len == 0) {
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return RADIO_TX_ERR;
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}
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if(simOutSize > 0) {
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return RADIO_TX_ERR;
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}
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/* Copy packet data to temporary storage */
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memcpy(simOutDataBuffer, payload, payload_len);
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simOutSize = payload_len;
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/* Transmit */
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while(simOutSize > 0) {
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cooja_mt_yield();
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}
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simRadioHWOn = radiostate;
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return RADIO_TX_OK;
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}
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/*---------------------------------------------------------------------------*/
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static int
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prepare_packet(const void *data, unsigned short len)
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{
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pending_data = data;
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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transmit_packet(unsigned short len)
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{
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int ret = RADIO_TX_ERR;
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if(pending_data != NULL) {
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ret = radio_send(pending_data, len);
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}
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return ret;
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}
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/*---------------------------------------------------------------------------*/
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static int
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receiving_packet(void)
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{
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return simReceiving;
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}
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/*---------------------------------------------------------------------------*/
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static int
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pending_packet(void)
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{
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return !simReceiving && simInSize > 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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channel_clear(void)
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{
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if(simSignalStrength > CCA_SS_THRESHOLD) {
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return 0;
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}
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(cooja_radio_process, ev, data)
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{
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int len;
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PROCESS_BEGIN();
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while(1) {
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PROCESS_YIELD_UNTIL(ev == PROCESS_EVENT_POLL);
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packetbuf_clear();
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len = radio_read(packetbuf_dataptr(), PACKETBUF_SIZE);
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if(len > 0) {
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packetbuf_set_datalen(len);
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NETSTACK_RDC.input();
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}
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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static int
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init(void)
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{
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process_start(&cooja_radio_process, NULL);
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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const struct radio_driver cooja_radio_driver =
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{
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init,
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prepare_packet,
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transmit_packet,
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radio_send,
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radio_read,
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channel_clear,
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receiving_packet,
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pending_packet,
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radio_on,
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radio_off,
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};
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/*---------------------------------------------------------------------------*/
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SIM_INTERFACE(radio_interface,
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doInterfaceActionsBeforeTick,
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doInterfaceActionsAfterTick);
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