osd-contiki/examples/jcreate/announce-blink.c

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/*
* Copyright (c) 2009, 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.
*
* This file is part of the Contiki operating system.
*
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* $Id: announce-blink.c,v 1.3 2010/05/03 22:02:59 nifi Exp $
*/
/**
* \file
* Example program that displays the number of neighbors on the JCreate LEDs
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "contiki.h"
#include "contiki-net.h"
#include "shell.h"
#include "dev/acc-sensor.h"
#include "net/mac/xmac.h"
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#include "dev/leds.h"
#include <stdio.h>
#define MAX_NEIGHBORS_SEEN 8
#define NEIGHBOR_TIMEOUT 4 * CLOCK_SECOND
static struct announcement announcement;
struct neighbor_entry {
struct neighbor_entry *next;
rimeaddr_t addr;
struct ctimer ctimer;
};
LIST(neighbor_table);
MEMB(neighbor_mem, struct neighbor_entry, MAX_NEIGHBORS_SEEN);
/*---------------------------------------------------------------------------*/
PROCESS(announce_blink_process, "Annouce blink");
AUTOSTART_PROCESSES(&announce_blink_process);
/*---------------------------------------------------------------------------*/
/*
* This function takes the length of the neighbor table list and
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* displays it on the on-board LEDs.
*/
static void
show_leds(void)
{
int val, i;
int num;
num = list_length(neighbor_table);
val = 1;
for(i = 0; i < num; ++i) {
val |= (val << 1);
}
val >>= 1;
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leds_on(val & 0xff);
leds_off(~(val & 0xff));
}
/*---------------------------------------------------------------------------*/
static void
remove_neighbor(void *dummy)
{
struct neighbor_entry *e = dummy;
list_remove(neighbor_table, e);
memb_free(&neighbor_mem, e);
show_leds();
printf("%d.%d: removed %d.%d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
e->addr.u8[0], e->addr.u8[1]);
}
/*---------------------------------------------------------------------------*/
static void
received_announcement(struct announcement *a, const rimeaddr_t *from,
uint16_t id, uint16_t value)
{
struct neighbor_entry *e;
printf("%d.%d: announcement from neighbor %d.%d, id %d, value %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
from->u8[0], from->u8[1],
id, value);
for(e = list_head(neighbor_table); e != NULL; e = e->next) {
if(rimeaddr_cmp(from, &e->addr)) {
ctimer_set(&e->ctimer, NEIGHBOR_TIMEOUT, remove_neighbor, e);
show_leds();
return;
}
}
e = memb_alloc(&neighbor_mem);
if(e != NULL) {
rimeaddr_copy(&e->addr, from);
list_add(neighbor_table, e);
ctimer_set(&e->ctimer, NEIGHBOR_TIMEOUT, remove_neighbor, e);
} else {
}
show_leds();
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(announce_blink_process, ev, data)
{
PROCESS_BEGIN();
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announcement_register(&announcement, 80, received_announcement);
list_init(neighbor_table);
memb_init(&neighbor_mem);
{
int i;
for(i = 0; i < 10; ++i) {
rimeaddr_t r;
r.u8[0] = r.u8[1] = i;
received_announcement(NULL, &r, 0, 0);
received_announcement(NULL, &r, 0, 0);
}
}
SENSORS_ACTIVATE(acc_sensor);
/* Lower the transmission power for the announcements so that only
close-range neighbors are noticed. (Makes for a nicer visual
effect.) */
xmac_set_announcement_radio_txpower(1);
while(1) {
static struct etimer e;
static uint16_t last_value;
etimer_set(&e, CLOCK_SECOND / 8);
PROCESS_WAIT_EVENT();
if(acc_sensor.value(1) / 256 != last_value) {
last_value = acc_sensor.value(1) / 256;
announcement_listen(1);
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/