252 lines
7.2 KiB
C
252 lines
7.2 KiB
C
/*
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* Copyright (c) 2007, 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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* This file is part of the Contiki operating system.
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*
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* $Id: tdma_mac.c,v 1.6 2009/03/12 21:58:20 adamdunkels Exp $
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*/
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#include "contiki.h"
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#include "net/mac/tdma_mac.h"
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#include "net/rime/packetbuf.h"
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#include "net/uip-fw.h"
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#include "sys/rtimer.h"
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#include "net/rime.h"
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#include "lib/memb.h"
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#include "lib/list.h"
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#include "dev/leds.h"
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#include "node-id.h"
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#include <string.h>
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#include <stdio.h>
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#define DEBUG 1
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#if DEBUG
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#define DLEDS_ON(x) leds_on(x)
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#define DLEDS_OFF(x) leds_off(x)
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#define DLEDS_TOGGLE(x) leds_toggle(x)
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define DLEDS_ON(x)
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#define DLEDS_OFF(x)
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#define DLEDS_TOGGLE(x)
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#define PRINTF(...)
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#endif
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/* TDMA configuration */
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#define NR_SLOTS 3
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#define SLOT_LENGTH (RTIMER_SECOND/3)
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#define GUARD_PERIOD (RTIMER_SECOND/12)
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#define MY_SLOT (node_id % NR_SLOTS)
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#define PERIOD_LENGTH RTIMER_SECOND
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/* Buffers */
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#define NUM_PACKETS 8
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uint8_t lastqueued = 0;
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uint8_t nextsend = 0;
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uint8_t freeslot = 0;
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struct queuebuf* data[NUM_PACKETS];
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int id[NUM_PACKETS];
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static struct rtimer rtimer;
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uint8_t timer_on = 0;
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static const struct radio_driver *radio;
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static void (* receiver_callback)(const struct mac_driver *);
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static int id_counter = 0;
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static int sent_counter = 0;
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/*---------------------------------------------------------------------------*/
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static char
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transmitter(struct rtimer *t, void *ptr)
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{
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int r;
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rtimer_clock_t now, rest, period_start, slot_start;
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/* Calculate slot start time */
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now = RTIMER_NOW();
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rest = now % PERIOD_LENGTH;
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period_start = now - rest;
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slot_start = period_start + MY_SLOT*SLOT_LENGTH;
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/* Check if we are inside our slot */
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if(now < slot_start ||
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now > slot_start + SLOT_LENGTH - GUARD_PERIOD) {
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PRINTF("TIMER We are outside our slot: %u != [%u,%u]\n", now, slot_start, slot_start + SLOT_LENGTH);
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while(now > slot_start + SLOT_LENGTH - GUARD_PERIOD) {
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slot_start += PERIOD_LENGTH;
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}
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PRINTF("TIMER Rescheduling until %u\n", slot_start);
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r = rtimer_set(&rtimer, slot_start, 1,
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(void (*)(struct rtimer *, void *))transmitter, NULL);
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if(r) {
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PRINTF("TIMER Error #1: %d\n", r);
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}
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return 1;
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}
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/* Transmit queued packets */
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while(nextsend != freeslot) {
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PRINTF("RADIO Transmitting packet #%i\n", id[nextsend]);
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if(!radio->send(queuebuf_dataptr(data[nextsend]),
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queuebuf_datalen(data[nextsend]))) {
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sent_counter++;
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PRINTF("RADIO Transmit OK for #%i, total=%i\n", id[nextsend], sent_counter);
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DLEDS_TOGGLE(LEDS_GREEN);
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} else {
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PRINTF("RADIO Transmit failed for #%i, total=%i\n", id[nextsend], sent_counter);
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DLEDS_TOGGLE(LEDS_RED);
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}
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nextsend = (nextsend + 1) % NUM_PACKETS;
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/* Recalculate new slot */
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if(RTIMER_NOW() > slot_start + SLOT_LENGTH - GUARD_PERIOD) {
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PRINTF("TIMER No more time to transmit\n");
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break;
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}
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}
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/* Calculate time of our next slot */
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slot_start += PERIOD_LENGTH;
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PRINTF("TIMER Rescheduling until %u\n", slot_start);
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r = rtimer_set(&rtimer, slot_start, 1,
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(void (*)(struct rtimer *, void *))transmitter, NULL);
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if(r) {
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PRINTF("TIMER Error #2: %d\n", r);
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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send(void)
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{
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int r;
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id_counter++;
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/* Clean up already sent packets */
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while(lastqueued != nextsend) {
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PRINTF("BUFFER Cleaning up packet #%i\n", id[lastqueued]);
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queuebuf_free(data[lastqueued]);
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data[lastqueued] = NULL;
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lastqueued = (lastqueued + 1) % NUM_PACKETS;
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}
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if((freeslot + 1) % NUM_PACKETS == lastqueued) {
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PRINTF("BUFFER Buffer full, dropping packet #%i\n", (id_counter+1));
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return UIP_FW_DROPPED;
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}
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/* Allocate queue buf for packet */
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data[freeslot] = queuebuf_new_from_packetbuf();
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id[freeslot] = id_counter;
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if(data[freeslot] == NULL) {
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PRINTF("BUFFER Queuebuffer full, dropping packet #%i\n", id[freeslot]);
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return UIP_FW_DROPPED;
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}
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PRINTF("BUFFER Wrote packet #%i to buffer \n", id[freeslot]);
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freeslot = (freeslot + 1) % NUM_PACKETS;
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if(!timer_on) {
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PRINTF("TIMER Starting timer\n");
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r = rtimer_set(&rtimer, RTIMER_NOW() + RTIMER_SECOND, 1,
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(void (*)(struct rtimer *, void *))transmitter, NULL);
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if(r) {
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PRINTF("TIMER Error #3: %d\n", r);
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} else {
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timer_on = 1;
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}
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}
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return UIP_FW_OK; /* TODO Return what? */
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}
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/*---------------------------------------------------------------------------*/
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static void
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input(const struct radio_driver *d)
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{
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receiver_callback(&tdma_mac_driver);
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}
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/*---------------------------------------------------------------------------*/
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static int
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read(void)
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{
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int len;
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packetbuf_clear();
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len = radio->read(packetbuf_dataptr(), PACKETBUF_SIZE);
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packetbuf_set_datalen(len);
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return len;
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}
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/*---------------------------------------------------------------------------*/
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static void
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set_receive_function(void (* recv)(const struct mac_driver *))
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{
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receiver_callback = recv;
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}
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/*---------------------------------------------------------------------------*/
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static int
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on(void)
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{
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return radio->on();
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}
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/*---------------------------------------------------------------------------*/
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static int
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off(void)
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{
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return radio->off();
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}
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/*---------------------------------------------------------------------------*/
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const struct mac_driver *
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tdma_mac_init(const struct radio_driver *d)
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{
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int i;
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for(i = 0; i < NUM_PACKETS; i++) {
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data[i] = NULL;
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}
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radio = d;
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radio->set_receive_function(input);
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radio->on();
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return &tdma_mac_driver;
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}
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/*---------------------------------------------------------------------------*/
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const struct mac_driver tdma_mac_driver = {
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"TDMA MAC",
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send,
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read,
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set_receive_function,
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on,
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off,
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};
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