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

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/*
* 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 1.1 2006/08/21 12:11:20 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/log.h"
const struct simInterface radio_interface;
// COOJA variables
char simReceivedPacket;
char simSentPacket;
char simReceivedPacketData[UIP_BUFSIZE];
char simSentPacketData[UIP_BUFSIZE];
int simSentPacketSize;
int simReceivedPacketSize;
char simEtherBusy;
int retryCounter;
char simRadioHWOn = 1;
// Ether process
PROCESS(ether_process, "Simulated Ether");
PROCESS_THREAD(ether_process, ev, data)
{
static struct etimer send_timer;
PROCESS_BEGIN();
// All outgoing messages pass through this process
// By using the COOJA variables simEtherBusy and !!!!TODO signalstrength!!!!
// this may be used to imitate a simple MAC protocol.
while(1) {
PROCESS_WAIT_EVENT();
// MAC protocol imitiation
// (this process is polled from simDoSend())
// Confirm we actually have data to send and radio hardware is on
if (simRadioHWOn && simSentPacketSize > 0) {
// Wait some random time to avoid initial collisions
// MAC uses external random generator to get stochastic radio behaviour
etimer_set(&send_timer, rand() % 20);
PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&send_timer));
retryCounter = 0;
while (simEtherBusy && retryCounter < 5) {
retryCounter++;
// Wait some random time hoping ether will free
// MAC uses external random generator to get stochastic radio behaviour
etimer_set(&send_timer, rand() % 20);
PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&send_timer));
}
if (simEtherBusy) {
log_message("MAC layer skipping packet", "");
} else {
// Tell COOJA about our new packet
simSentPacket = 1;
}
}
}
PROCESS_END();
}
/*-----------------------------------------------------------------------------------*/
static void
doInterfaceActionsBeforeTick(void)
{
// Handle incoming network packets if any
if (simReceivedPacket) {
// If hardware is turned off, just remove packet
if (!simRadioHWOn) {
simReceivedPacket = 0;
simReceivedPacketSize = 0;
return;
}
// Reset flag
simReceivedPacket = 0;
if (simReceivedPacketSize == 0) {
fprintf(stderr, "simReceivedPacketSize == 0: Didn't I receive a packet?\n");
return;
}
// Copy incoming data to correct buffers and call handling routines
uip_len = simReceivedPacketSize;
if(uip_len > UIP_BUFSIZE) {
fprintf(stderr, "doInterfaceActionsBeforeTick>> uip_len too large - dropping\n");
uip_len = 0;
} else {
memcpy(&uip_buf[UIP_LLH_LEN], &simReceivedPacketData[0], simReceivedPacketSize);
simReceivedPacketSize = 0;
// Handle new packet
tcpip_input();
}
}
}
/*-----------------------------------------------------------------------------------*/
static void
doInterfaceActionsAfterTick(void)
{
// Nothing to do
}
/*-----------------------------------------------------------------------------------*/
u8_t
simDoSend(void)
{
// If hardware is turned off, just remove packet
if (!simRadioHWOn) {
// Should we reset uip_len if radio is off?
uip_len = 0;
return UIP_FW_DROPPED;
}
// If outgoing data, but too large, drop it
if(uip_len > UIP_BUFSIZE) {
fprintf(stderr, "simDoSend>> uip_len too large - dropping\n");
uip_len = 0;
return UIP_FW_TOOLARGE;
}
// If outgoing data, back it up, and wake ether process
if (uip_len > 0) {
// Backup packet data/size
memcpy(&simSentPacketData[0], &uip_buf[UIP_LLH_LEN], uip_len);
simSentPacketSize = uip_len;
process_poll(&ether_process);
return UIP_FW_OK;
}
return UIP_FW_ZEROLEN;
}
/*-----------------------------------------------------------------------------------*/
/**
* \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);