A program that displays the number of neighbors on the JCreate LEDs

examples/jcreate/announce-blink.c

@@ -0,0 +1,196 @@
+/*
+ * 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.
+ *
+ * $Id: announce-blink.c,v 1.1 2009/03/24 19:45:46 adamdunkels 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"
+
+#if CONTIKI_TARGET_SKY
+#include "dev/acc-sensor.h"
+#include "dev/cc2420.h"
+#include "net/mac/xmac.h"
+#endif /* CONTIKI_TARGET_SKY */
+
+#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
+ * displays it on the on-board LEDs. There is currently no support for
+ * using 8 LEDs in the standard Contiki LED library, so we directly
+ * write to the LEDS_PxOUT variable.
+ */
+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;
+
+#if CONTIKI_TARGET_SKY
+  LEDS_PxOUT = ~val;
+#endif /* CONTIKI_TARGET_SKY */
+}
+/*---------------------------------------------------------------------------*/
+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, 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();
+
+  /* XXX the Sentilla JCreate has 8 LEDs, and we need to set the ports
+     correctly. */
+#if CONTIKI_TARGET_SKY
+  LEDS_PxDIR = 0xff;
+  LEDS_PxOUT = 0xff;
+#endif /* CONTIKI_TARGET_SKY */
+
+  announcement_register(&announcement, 80, 0,
+			received_announcement);
+
+  list_init(neighbor_table);
+  memb_init(&neighbor_mem);
+
+#if CONTIKI_TARGET_NATIVE
+  {
+    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);
+    }
+  }
+#endif /* CONTIKI_TARGET_NATIVE */
+  
+#if CONTIKI_TARGET_SKY
+  acc_sensor.activate();
+
+  /* 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);
+#endif /* CONTIKI_TARGET_SKY */
+  
+  while(1) {
+    static struct etimer e;
+    static uint16_t last_value;
+    
+    etimer_set(&e, CLOCK_SECOND / 8);
+    PROCESS_WAIT_EVENT();
+#if CONTIKI_TARGET_SKY
+    if(acc_sensor.value(1) / 256 != last_value) {
+      last_value = acc_sensor.value(1) / 256;
+      announcement_listen(1);
+    }
+#endif /* CONTIKI_TARGET_SKY */
+  }
+  
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/