Moving timesynch.[ch] from sys/ to core/net/rime as they have more to do with Rime than with the kernel

core/net/rime/timesynch.c

@@ -0,0 +1,183 @@
+/**
+ * \addtogroup timesynch
+ * @{
+ */
+
+
+/*
+ * Copyright (c) 2007, 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: timesynch.c,v 1.1 2008/01/14 14:22:16 adamdunkels Exp $
+ */
+
+/**
+ * \file
+ *         A simple time synchronization mechanism
+ * \author
+ *         Adam Dunkels <adam@sics.se>
+ */
+
+#include "net/rime/timesynch.h"
+#include "net/rime/rimebuf.h"
+#include "net/rime.h"
+#include "dev/simple-cc2420.h"
+
+static const struct mac_driver *mac;
+static void (* receiver_callback)(const struct mac_driver *);
+
+#include <stdio.h>
+
+static int authority_level;
+static rtimer_clock_t offset;
+
+/*---------------------------------------------------------------------------*/
+int
+timesynch_authority_level(void)
+{
+  return authority_level;
+}
+/*---------------------------------------------------------------------------*/
+void
+timesynch_set_authority_level(int level)
+{
+  authority_level = level;
+}
+/*---------------------------------------------------------------------------*/
+rtimer_clock_t
+timesynch_time(void)
+{
+  return rtimer_arch_now() + offset;
+}
+/*---------------------------------------------------------------------------*/
+rtimer_clock_t
+timesynch_time_to_rtimer(rtimer_clock_t synched_time)
+{
+  return synched_time - offset;
+}
+/*---------------------------------------------------------------------------*/
+rtimer_clock_t
+timesynch_offset(void)
+{
+  return offset;
+}
+/*---------------------------------------------------------------------------*/
+static int
+send_packet(void)
+{
+  return mac->send();
+}
+/*---------------------------------------------------------------------------*/
+static void
+adjust_offset(rtimer_clock_t authoritative_time, rtimer_clock_t local_time)
+{
+  offset = offset + authoritative_time - local_time;
+}
+/*---------------------------------------------------------------------------*/
+static int
+read_packet(void)
+{
+  int len;
+
+  len = mac->read();
+
+  if(len == 0) {
+    return 0;
+  }
+  
+  /* We check the authority level of the sender of the incoming
+     packet. If the sending node has a lower authority level than we
+     have, we synchronize to the time of the sending node and set our
+     own authority level to be one more than the sending node. */
+  if(simple_cc2420_authority_level_of_sender < authority_level) {
+    
+    adjust_offset(simple_cc2420_time_of_departure,
+		  simple_cc2420_time_of_arrival);
+    if(simple_cc2420_authority_level_of_sender + 1 != authority_level) {
+      authority_level = simple_cc2420_authority_level_of_sender + 1;
+    }
+
+  }
+  
+  return len;
+}
+/*---------------------------------------------------------------------------*/
+#if 0
+static void
+periodic_authority_increase(void *ptr)
+{
+  /* XXX the authority level should be increased over time except
+     for the sink node (which has authority 0). */
+}
+#endif
+/*---------------------------------------------------------------------------*/
+static void
+set_receive_function(void (* recv)(const struct mac_driver *))
+{
+  receiver_callback = recv;
+}
+/*---------------------------------------------------------------------------*/
+static int
+on(void)
+{
+  return mac->on();
+}
+/*---------------------------------------------------------------------------*/
+static int
+off(void)
+{
+  return mac->off();
+}
+/*---------------------------------------------------------------------------*/
+static const struct mac_driver timesynch_driver = {
+  send_packet,
+  read_packet,
+  set_receive_function,
+  on,
+  off,
+};
+/*---------------------------------------------------------------------------*/
+static void
+input_packet(const struct mac_driver *d)
+{
+  if(receiver_callback) {
+    receiver_callback(&timesynch_driver);
+  }
+}
+/*---------------------------------------------------------------------------*/
+const struct mac_driver *
+timesynch_init(const struct mac_driver *d)
+{
+  mac = d;
+  mac->set_receive_function(input_packet);
+  mac->on();
+  return &timesynch_driver;
+}
+/*---------------------------------------------------------------------------*/
+/** @} */