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206 lines
6.0 KiB
C
206 lines
6.0 KiB
C
/*
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* Copyright (c) 2006, 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: radio-arch.c,v 1.1 2006/08/21 12:11:20 fros4943 Exp $
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*/
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#include "dev/radio-arch.h"
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#include "dev/radio.h"
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#include "lib/simEnvChange.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "net/uip.h"
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#include "net/uip-fw.h"
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#include "sys/etimer.h"
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#include "sys/log.h"
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const struct simInterface radio_interface;
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// COOJA variables
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char simReceivedPacket;
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char simSentPacket;
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char simReceivedPacketData[UIP_BUFSIZE];
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char simSentPacketData[UIP_BUFSIZE];
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int simSentPacketSize;
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int simReceivedPacketSize;
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char simEtherBusy;
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int retryCounter;
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char simRadioHWOn = 1;
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// Ether process
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PROCESS(ether_process, "Simulated Ether");
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PROCESS_THREAD(ether_process, ev, data)
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{
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static struct etimer send_timer;
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PROCESS_BEGIN();
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// All outgoing messages pass through this process
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// By using the COOJA variables simEtherBusy and !!!!TODO signalstrength!!!!
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// this may be used to imitate a simple MAC protocol.
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while(1) {
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PROCESS_WAIT_EVENT();
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// MAC protocol imitiation
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// (this process is polled from simDoSend())
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// Confirm we actually have data to send and radio hardware is on
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if (simRadioHWOn && simSentPacketSize > 0) {
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// Wait some random time to avoid initial collisions
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// MAC uses external random generator to get stochastic radio behaviour
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etimer_set(&send_timer, rand() % 20);
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PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&send_timer));
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retryCounter = 0;
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while (simEtherBusy && retryCounter < 5) {
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retryCounter++;
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// Wait some random time hoping ether will free
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// MAC uses external random generator to get stochastic radio behaviour
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etimer_set(&send_timer, rand() % 20);
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PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&send_timer));
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}
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if (simEtherBusy) {
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log_message("MAC layer skipping packet", "");
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} else {
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// Tell COOJA about our new packet
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simSentPacket = 1;
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}
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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 void
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doInterfaceActionsBeforeTick(void)
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{
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// Handle incoming network packets if any
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if (simReceivedPacket) {
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// If hardware is turned off, just remove packet
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if (!simRadioHWOn) {
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simReceivedPacket = 0;
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simReceivedPacketSize = 0;
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return;
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}
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// Reset flag
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simReceivedPacket = 0;
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if (simReceivedPacketSize == 0) {
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fprintf(stderr, "simReceivedPacketSize == 0: Didn't I receive a packet?\n");
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return;
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}
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// Copy incoming data to correct buffers and call handling routines
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uip_len = simReceivedPacketSize;
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if(uip_len > UIP_BUFSIZE) {
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fprintf(stderr, "doInterfaceActionsBeforeTick>> uip_len too large - dropping\n");
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uip_len = 0;
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} else {
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memcpy(&uip_buf[UIP_LLH_LEN], &simReceivedPacketData[0], simReceivedPacketSize);
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simReceivedPacketSize = 0;
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// Handle new packet
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tcpip_input();
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}
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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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// Nothing to do
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}
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/*-----------------------------------------------------------------------------------*/
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u8_t
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simDoSend(void)
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{
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// If hardware is turned off, just remove packet
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if (!simRadioHWOn) {
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// Should we reset uip_len if radio is off?
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uip_len = 0;
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return UIP_FW_DROPPED;
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}
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// If outgoing data, but too large, drop it
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if(uip_len > UIP_BUFSIZE) {
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fprintf(stderr, "simDoSend>> uip_len too large - dropping\n");
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uip_len = 0;
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return UIP_FW_TOOLARGE;
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}
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// If outgoing data, back it up, and wake ether process
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if (uip_len > 0) {
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// Backup packet data/size
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memcpy(&simSentPacketData[0], &uip_buf[UIP_LLH_LEN], uip_len);
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simSentPacketSize = uip_len;
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process_poll(ðer_process);
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return UIP_FW_OK;
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}
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return UIP_FW_ZEROLEN;
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}
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/*-----------------------------------------------------------------------------------*/
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/**
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* \brief Turn radio on.
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*
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* This function turns the radio hardware on.
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*/
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void
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radio_on(void) {
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simRadioHWOn = 1;
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}
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/*-----------------------------------------------------------------------------------*/
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/**
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* \brief Turn radio off.
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*
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* This function turns the radio hardware off.
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*/
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void radio_off(void) {
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simRadioHWOn = 0;
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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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