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-/*
-    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
-                 2011,2012,2013 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 PAL PAL Driver
- * @brief   I/O Ports Abstraction Layer
- * @details This module defines an abstract interface for digital I/O ports.
- *          Note that most I/O ports functions are just macros. The macros
- *          have default software implementations that can be redefined in a
- *          PAL Low Level Driver if the target hardware supports special
- *          features like, for example, atomic bit set/reset/masking. Please
- *          refer to the ports specific documentation for details.<br>
- *          The @ref PAL has the advantage to make the access to the I/O
- *          ports platform independent and still be optimized for the specific
- *          architectures.<br>
- *          Note that the PAL Low Level Driver may also offer non standard
- *          macro and functions in order to support specific features but,
- *          of course, the use of such interfaces would not be portable.
- *          Such interfaces shall be marked with the architecture name inside
- *          the function names.
- * @pre     In order to use the PAL driver the @p HAL_USE_PAL option
- *          must be enabled in @p halconf.h.
- *
- * @section pal_1 Implementation Rules
- * In implementing a PAL Low Level Driver there are some rules/behaviors that
- * should be respected.
- *
- * @subsection pal_1_1 Writing on input pads
- * The behavior is not specified but there are implementations better than
- * others, this is the list of possible implementations, preferred options
- * are on top:
- * -# The written value is not actually output but latched, should the pads
- *    be reprogrammed as outputs the value would be in effect.
- * -# The write operation is ignored.
- * -# The write operation has side effects, as example disabling/enabling
- *    pull up/down resistors or changing the pad direction. This scenario is
- *    discouraged, please try to avoid this scenario.
- * .
- * @subsection pal_1_2 Reading from output pads
- * The behavior is not specified but there are implementations better than
- * others, this is the list of possible implementations, preferred options
- * are on top:
- * -# The actual pads states are read (not the output latch).
- * -# The output latch value is read (regardless of the actual pads states).
- * -# Unspecified, please try to avoid this scenario.
- * .
- * @subsection pal_1_3 Writing unused or unimplemented port bits
- * The behavior is not specified.
- *
- * @subsection pal_1_4 Reading from unused or unimplemented port bits
- * The behavior is not specified.
- *
- * @subsection pal_1_5 Reading or writing on pins associated to other functionalities
- * The behavior is not specified.
- *
- * @ingroup IO
- */