contiki/platform/cooja/dev/cooja-radio.c

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/*
* Copyright (c) 2007, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: cooja-radio.c,v 1.8 2008/03/18 16:22:00 fros4943 Exp $
*/
#include <string.h>
#include "contiki.h"
#include "dev/radio.h"
#include "dev/cooja-radio.h"
#include "lib/simEnvChange.h"
#include "sys/cooja_mt.h"
#define USING_CCA 1
#define USING_CCA_BUSYWAIT 1
#define CCA_BUSYWAIT_MS 100
#define CCA_SS_THRESHOLD -95
#define SS_NOTHING -100
const struct simInterface radio_interface;
// COOJA variables
char simTransmitting = 0;
char simReceiving = 0;
char simInDataBuffer[COOJA_RADIO_BUFSIZE];
int simInSize = 0;
char simInPolled = 0;
char simOutDataBuffer[COOJA_RADIO_BUFSIZE];
int simOutSize = 0;
char simRadioHWOn = 1;
int simSignalStrength = SS_NOTHING;
int simLastSignalStrength = SS_NOTHING;
char simPower = 100;
int simRadioChannel = 26;
int inSendFunction = 0;
static void (* receiver_callback)(const struct radio_driver *);
const struct radio_driver cooja_driver =
{
radio_send,
radio_read,
radio_set_receiver,
radio_on,
radio_off,
};
/*-----------------------------------------------------------------------------------*/
void
radio_set_receiver(void (* recv)(const struct radio_driver *))
{
receiver_callback = recv;
}
/*-----------------------------------------------------------------------------------*/
int
radio_on(void)
{
simRadioHWOn = 1;
return 1;
}
/*-----------------------------------------------------------------------------------*/
int
radio_off(void)
{
simRadioHWOn = 0;
return 1;
}
/*---------------------------------------------------------------------------*/
void
radio_set_channel(int channel)
{
simRadioChannel = channel;
}
/*-----------------------------------------------------------------------------------*/
int
radio_sstrength(void)
{
return simLastSignalStrength;
}
/*-----------------------------------------------------------------------------------*/
int
radio_current_sstrength(void)
{
return simSignalStrength;
}
/*-----------------------------------------------------------------------------------*/
void
radio_set_txpower(unsigned char power)
{
/* 1 - 100: Number indicating output power */
simPower = power;
}
/*-----------------------------------------------------------------------------------*/
static void
doInterfaceActionsBeforeTick(void)
{
// If radio is turned off, do nothing
if (!simRadioHWOn) {
simInSize = 0;
simInPolled = 0;
return;
}
// Don't fall asleep while receiving (in main file)
if (simReceiving) {
simLastSignalStrength = simSignalStrength;
simDontFallAsleep = 1;
return;
}
// If no incoming radio data, do nothing
if (simInSize == 0) {
simInPolled = 0;
return;
}
// Check size of received packet
if (simInSize > COOJA_RADIO_BUFSIZE) {
// Drop packet by not delivering
return;
}
// ** Good place to add explicit manchester/gcr-encoding
if(receiver_callback != NULL && !simInPolled) {
simDoReceiverCallback = 1;
simInPolled = 1;
} else {
simInPolled = 0;
simDontFallAsleep = 1;
}
}
/*---------------------------------------------------------------------------*/
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int
radio_read(void *buf, unsigned short bufsize)
{
int tmpInSize = simInSize;
if(simInSize > 0) {
memcpy(buf, simInDataBuffer, simInSize);
simInSize = 0;
return tmpInSize;
}
return 0;
}
/*-----------------------------------------------------------------------------------*/
static void
doInterfaceActionsAfterTick(void)
{
// Make sure we are awake during radio activity
if (simReceiving || simTransmitting) {
simDontFallAsleep = 1;
return;
}
}
/*-----------------------------------------------------------------------------------*/
int
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radio_send(const void *payload, unsigned short payload_len)
{
/* If radio already actively transmitting, drop packet*/
if(inSendFunction) {
return COOJA_RADIO_DROPPED;
}
inSendFunction = 1;
/* If radio is turned off, do nothing */
if(!simRadioHWOn) {
inSendFunction = 0;
return COOJA_RADIO_DROPPED;
}
/* Drop packet if data size too large */
if(payload_len > COOJA_RADIO_BUFSIZE) {
inSendFunction = 0;
return COOJA_RADIO_TOOLARGE;
}
/* Drop packet if no data length */
if(payload_len <= 0) {
inSendFunction = 0;
return COOJA_RADIO_ZEROLEN;
}
/* Copy packet data to temporary storage */
memcpy(simOutDataBuffer, payload, payload_len);
simOutSize = payload_len;
#if USING_CCA_BUSYWAIT
/* Busy-wait until both radio HW and ether is ready */
{
int retries = 0;
while(retries < CCA_BUSYWAIT_MS && !simNoYield &&
(simSignalStrength > CCA_SS_THRESHOLD || simReceiving)) {
retries++;
cooja_mt_yield();
if(!(simSignalStrength > CCA_SS_THRESHOLD || simReceiving)) {
/* Wait one extra tick before transmission starts */
cooja_mt_yield();
}
}
}
#endif /* USING_CCA_BUSYWAIT */
#if USING_CCA
if(simSignalStrength > CCA_SS_THRESHOLD || simReceiving) {
inSendFunction = 0;
return COOJA_RADIO_DROPPED;
}
#endif /* USING_CCA */
if(simOutSize <= 0) {
inSendFunction = 0;
return COOJA_RADIO_DROPPED;
}
// - Initiate transmission -
simTransmitting = 1;
// Busy-wait while transmitting
while(simTransmitting && !simNoYield) {
cooja_mt_yield();
}
if (simTransmitting) {
simDontFallAsleep = 1;
}
inSendFunction = 0;
return COOJA_RADIO_OK;
}
/*-----------------------------------------------------------------------------------*/
void radio_call_receiver()
{
receiver_callback(&cooja_driver);
}
/*-----------------------------------------------------------------------------------*/
SIM_INTERFACE(radio_interface,
doInterfaceActionsBeforeTick,
doInterfaceActionsAfterTick);