--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/master/datagram_pair.c	Thu Jan 12 17:41:05 2012 +0100
@@ -0,0 +1,71 @@
+/******************************************************************************
+ *
+ *  $Id$
+ *
+ *  Copyright (C) 2006-2012  Florian Pose, Ingenieurgemeinschaft IgH
+ *
+ *  This file is part of the IgH EtherCAT Master.
+ *
+ *  The IgH EtherCAT Master is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License version 2, as
+ *  published by the Free Software Foundation.
+ *
+ *  The IgH EtherCAT Master is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
+ *  Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the IgH EtherCAT Master; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ *  ---
+ *
+ *  The license mentioned above concerns the source code only. Using the
+ *  EtherCAT technology and brand is only permitted in compliance with the
+ *  industrial property and similar rights of Beckhoff Automation GmbH.
+ *
+ *****************************************************************************/
+
+/**
+   \file
+   EtherCAT datagram pair methods.
+*/
+
+/*****************************************************************************/
+
+#include "datagram_pair.h"
+
+/*****************************************************************************/
+
+/** Datagram pair constructor.
+ */
+void ec_datagram_pair_init(
+        ec_datagram_pair_t *pair /**< Datagram pair. */
+        )
+{
+    unsigned int i;
+
+    INIT_LIST_HEAD(&pair->list);
+
+    for (i = 0; i < EC_NUM_DEVICES; i++) {
+        ec_datagram_init(&pair->datagrams[i]);
+    }
+}
+
+/*****************************************************************************/
+
+/** Datagram pair destructor.
+ */
+void ec_datagram_pair_clear(
+        ec_datagram_pair_t *pair /**< Datagram pair. */
+        )
+{
+    unsigned int i;
+
+    for (i = 0; i < EC_NUM_DEVICES; i++) {
+        ec_datagram_clear(&pair->datagrams[i]);
+    }
+}
+
+/*****************************************************************************/