contiki/platform/cooja/dev/radio-arch.c
fros4943 b1afe2257b changed simulated mac protocol;
waiting for both hw and ether at the same time
2006-10-11 09:06:41 +00:00

205 lines
5.6 KiB
C

/*
* Copyright (c) 2006, 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: radio-arch.c,v 1.9 2006/10/11 09:06:41 fros4943 Exp $
*/
#include "dev/radio-arch.h"
#include "dev/radio.h"
#include "lib/simEnvChange.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "net/uip.h"
#include "net/uip-fw.h"
#include "sys/etimer.h"
#include "sys/cooja_mt.h"
#include "sys/log.h"
#define MAX_RETRIES 100
#define SS_INTERFERENCE -150
const struct simInterface radio_interface;
// COOJA variables
char simTransmitting;
char simReceiving;
char simInDataBuffer[UIP_BUFSIZE];
int simInSize;
char simOutDataBuffer[UIP_BUFSIZE];
int simOutSize;
char simRadioHWOn = 1;
int simSignalStrength = -200;
char simPower = 100;
/*-----------------------------------------------------------------------------------*/
int
radio_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;
return;
}
// Don't fall asleep while receiving (in main file)
if (simReceiving) {
simDontFallAsleep = 1;
return;
}
// If no incoming radio data, do nothing
if (simInSize == 0) {
return;
}
// Check size of received packet
if (simInSize > UIP_BUFSIZE) {
// Drop packet by not delivering
return;
}
// ** Good place to add explicit manchester/gcr-encoding
// Hand over new packet to uIP
uip_len = simInSize;
memcpy(&uip_buf[UIP_LLH_LEN], &simInDataBuffer[0], simInSize);
if (simNoYield)
simDoTcpipInput = 1;
else
tcpip_input();
simInSize = 0;
}
/*-----------------------------------------------------------------------------------*/
static void
doInterfaceActionsAfterTick(void)
{
// Make sure we are awake during radio activity
if (simReceiving || simTransmitting) {
simDontFallAsleep = 1;
return;
}
}
/*-----------------------------------------------------------------------------------*/
u8_t
simDoSend(void)
{
// If radio is turned off, do nothing
if (!simRadioHWOn) {
// TODO Should we reset uip_len if radio is off?
uip_len = 0;
return UIP_FW_DROPPED;
}
// Drop packet if data size too large
if(uip_len > UIP_BUFSIZE) {
uip_len = 0;
return UIP_FW_TOOLARGE;
}
// Drop packet if no data length
if (uip_len <= 0) {
return UIP_FW_ZEROLEN;
}
// ** Good place to add explicit manchester/gcr-decoding
// Copy packet data to temporary storage
memcpy(&simOutDataBuffer[0], &uip_buf[UIP_LLH_LEN], uip_len);
simOutSize = uip_len;
// Busy-wait until both radio HW and ether is ready
int retries=0;
while (retries < MAX_RETRIES && !simNoYield &&
(simSignalStrength > SS_INTERFERENCE || simReceiving))
{
retries++;
cooja_mt_yield();
if (!(simSignalStrength > SS_INTERFERENCE || simReceiving))
{
// Wait one extra tick before transmission starts
cooja_mt_yield();
}
}
if (simSignalStrength > SS_INTERFERENCE || simReceiving) {
return UIP_FW_DROPPED;
}
// - Initiate transmission -
simTransmitting = 1;
// Busy-wait while transmitting
if (simTransmitting && !simNoYield) {
cooja_mt_yield();
}
return UIP_FW_OK;
}
/*-----------------------------------------------------------------------------------*/
/**
* \brief Turn radio on.
*
* This function turns the radio hardware on.
*/
void
radio_on(void) {
simRadioHWOn = 1;
}
/*-----------------------------------------------------------------------------------*/
/**
* \brief Turn radio off.
*
* This function turns the radio hardware off.
*/
void radio_off(void) {
simRadioHWOn = 0;
}
/*-----------------------------------------------------------------------------------*/
SIM_INTERFACE(radio_interface,
doInterfaceActionsBeforeTick,
doInterfaceActionsAfterTick);