RTC. Doxy file added.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/rtc_dev@3273 35acf78f-673a-0410-8e92-d51de3d6d3f4

os/hal/dox/rtc.dox

@@ -0,0 +1,32 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
+                 2011 Giovanni Di Sirio.
+
+    This file is part of ChibiOS/RT.
+
+    ChibiOS/RT is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    ChibiOS/RT 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @defgroup RTC RTC Driver
+ * @brief   Real Time Clock Abstraction Layer
+ * @details This module defines an abstract interface for Real Time Clock cell.
+ *          If you do not need callback functionality than disable 
+ *          @p RTC_SUPPORTS_CALLBACKS option in @p halconf.h.
+ *
+ * @pre     In order to use the RTC driver the @p HAL_USE_RTC option
+ *          must be enabled in @p halconf.h. 
+ *
+ * @ingroup IO
+ */