490 lines
18 KiB
C
490 lines
18 KiB
C
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2012.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2012 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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* \brief Endianness and Byte Ordering macros and functions.
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*
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* \copydetails Group_Endianness
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*/
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/** \ingroup Group_Endianness
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* \defgroup Group_ByteSwapping Byte Reordering
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* \brief Macros and functions for forced byte reordering.
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*/
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/** \ingroup Group_Endianness
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* \defgroup Group_EndianConversion Endianness Conversion
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* \brief Macros and functions for automatic endianness conversion.
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*/
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/** \ingroup Group_Common
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* \defgroup Group_Endianness Endianness and Byte Ordering
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* \brief Convenience macros and functions relating to byte (re-)ordering
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*
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* Common library convenience macros and functions relating to byte (re-)ordering.
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*
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* @{
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*/
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#ifndef __LUFA_ENDIANNESS_H__
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#define __LUFA_ENDIANNESS_H__
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/* Enable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* Preprocessor Checks: */
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#if !defined(__INCLUDE_FROM_COMMON_H)
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#error Do not include this file directly. Include LUFA/Common/Common.h instead to gain this functionality.
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#endif
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#if !(defined(ARCH_BIG_ENDIAN) || defined(ARCH_LITTLE_ENDIAN))
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#error ARCH_BIG_ENDIAN or ARCH_LITTLE_ENDIAN not set for the specified architecture.
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#endif
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/* Public Interface - May be used in end-application: */
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/* Macros: */
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/** Swaps the byte ordering of a 16-bit value at compile-time. Do not use this macro for swapping byte orderings
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* of dynamic values computed at runtime, use \ref SwapEndian_16() instead. The result of this macro can be used
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* inside struct or other variable initializers outside of a function, something that is not possible with the
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* inline function variant.
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*
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* \ingroup Group_ByteSwapping
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*
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* \param[in] x 16-bit value whose byte ordering is to be swapped.
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*
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* \return Input value with the byte ordering reversed.
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*/
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#define SWAPENDIAN_16(x) (uint16_t)((((x) & 0xFF00) >> 8) | (((x) & 0x00FF) << 8))
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/** Swaps the byte ordering of a 32-bit value at compile-time. Do not use this macro for swapping byte orderings
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* of dynamic values computed at runtime- use \ref SwapEndian_32() instead. The result of this macro can be used
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* inside struct or other variable initializers outside of a function, something that is not possible with the
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* inline function variant.
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*
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* \ingroup Group_ByteSwapping
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*
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* \param[in] x 32-bit value whose byte ordering is to be swapped.
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*
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* \return Input value with the byte ordering reversed.
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*/
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#define SWAPENDIAN_32(x) (uint32_t)((((x) & 0xFF000000UL) >> 24UL) | (((x) & 0x00FF0000UL) >> 8UL) | \
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(((x) & 0x0000FF00UL) << 8UL) | (((x) & 0x000000FFUL) << 24UL))
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#if defined(ARCH_BIG_ENDIAN) && !defined(le16_to_cpu)
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#define le16_to_cpu(x) SwapEndian_16(x)
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#define le32_to_cpu(x) SwapEndian_32(x)
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#define be16_to_cpu(x) (x)
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#define be32_to_cpu(x) (x)
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#define cpu_to_le16(x) SwapEndian_16(x)
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#define cpu_to_le32(x) SwapEndian_32(x)
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#define cpu_to_be16(x) (x)
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#define cpu_to_be32(x) (x)
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#define LE16_TO_CPU(x) SWAPENDIAN_16(x)
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#define LE32_TO_CPU(x) SWAPENDIAN_32(x)
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#define BE16_TO_CPU(x) (x)
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#define BE32_TO_CPU(x) (x)
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#define CPU_TO_LE16(x) SWAPENDIAN_16(x)
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#define CPU_TO_LE32(x) SWAPENDIAN_32(x)
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#define CPU_TO_BE16(x) (x)
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#define CPU_TO_BE32(x) (x)
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#elif !defined(le16_to_cpu)
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/** \name Run-time endianness conversion */
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//@{
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/** Performs a conversion between a Little Endian encoded 16-bit piece of data and the
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* Endianness of the currently selected CPU architecture.
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*
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* On little endian architectures, this macro does nothing.
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*
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* \note This macro is designed for run-time conversion of data - for compile-time endianness
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* conversion, use \ref LE16_TO_CPU instead.
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*
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* \ingroup Group_EndianConversion
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*
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* \param[in] x Data to perform the endianness conversion on.
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*
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* \return Endian corrected version of the input value.
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*/
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#define le16_to_cpu(x) (x)
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/** Performs a conversion between a Little Endian encoded 32-bit piece of data and the
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* Endianness of the currently selected CPU architecture.
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*
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* On little endian architectures, this macro does nothing.
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*
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* \note This macro is designed for run-time conversion of data - for compile-time endianness
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* conversion, use \ref LE32_TO_CPU instead.
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*
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* \ingroup Group_EndianConversion
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*
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* \param[in] x Data to perform the endianness conversion on.
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*
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* \return Endian corrected version of the input value.
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*/
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#define le32_to_cpu(x) (x)
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/** Performs a conversion between a Big Endian encoded 16-bit piece of data and the
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* Endianness of the currently selected CPU architecture.
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*
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* On big endian architectures, this macro does nothing.
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*
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* \note This macro is designed for run-time conversion of data - for compile-time endianness
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* conversion, use \ref BE16_TO_CPU instead.
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*
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* \ingroup Group_EndianConversion
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*
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* \param[in] x Data to perform the endianness conversion on.
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*
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* \return Endian corrected version of the input value.
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*/
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#define be16_to_cpu(x) SwapEndian_16(x)
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/** Performs a conversion between a Big Endian encoded 32-bit piece of data and the
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* Endianness of the currently selected CPU architecture.
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*
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* On big endian architectures, this macro does nothing.
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*
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* \note This macro is designed for run-time conversion of data - for compile-time endianness
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* conversion, use \ref BE32_TO_CPU instead.
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*
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* \ingroup Group_EndianConversion
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*
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* \param[in] x Data to perform the endianness conversion on.
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*
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* \return Endian corrected version of the input value.
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*/
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#define be32_to_cpu(x) SwapEndian_32(x)
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/** Performs a conversion on a natively encoded 16-bit piece of data to ensure that it
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* is in Little Endian format regardless of the currently selected CPU architecture.
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*
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* On little endian architectures, this macro does nothing.
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*
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* \note This macro is designed for run-time conversion of data - for compile-time endianness
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* conversion, use \ref CPU_TO_LE16 instead.
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*
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* \ingroup Group_EndianConversion
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*
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* \param[in] x Data to perform the endianness conversion on.
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*
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* \return Endian corrected version of the input value.
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*/
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#define cpu_to_le16(x) (x)
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/** Performs a conversion on a natively encoded 32-bit piece of data to ensure that it
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* is in Little Endian format regardless of the currently selected CPU architecture.
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*
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* On little endian architectures, this macro does nothing.
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*
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* \note This macro is designed for run-time conversion of data - for compile-time endianness
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* conversion, use \ref CPU_TO_LE32 instead.
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*
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* \ingroup Group_EndianConversion
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*
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* \param[in] x Data to perform the endianness conversion on.
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*
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* \return Endian corrected version of the input value.
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*/
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#define cpu_to_le32(x) (x)
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/** Performs a conversion on a natively encoded 16-bit piece of data to ensure that it
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* is in Big Endian format regardless of the currently selected CPU architecture.
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*
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* On big endian architectures, this macro does nothing.
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*
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* \note This macro is designed for run-time conversion of data - for compile-time endianness
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* conversion, use \ref CPU_TO_BE16 instead.
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*
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* \ingroup Group_EndianConversion
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*
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* \param[in] x Data to perform the endianness conversion on.
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*
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* \return Endian corrected version of the input value.
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*/
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#define cpu_to_be16(x) SwapEndian_16(x)
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/** Performs a conversion on a natively encoded 32-bit piece of data to ensure that it
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* is in Big Endian format regardless of the currently selected CPU architecture.
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*
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* On big endian architectures, this macro does nothing.
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*
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* \note This macro is designed for run-time conversion of data - for compile-time endianness
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* conversion, use \ref CPU_TO_BE32 instead.
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*
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* \ingroup Group_EndianConversion
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*
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* \param[in] x Data to perform the endianness conversion on.
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*
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* \return Endian corrected version of the input value.
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*/
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#define cpu_to_be32(x) SwapEndian_32(x)
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//@}
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/** \name Compile-time endianness conversion */
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//@{
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/** Performs a conversion between a Little Endian encoded 16-bit piece of data and the
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* Endianness of the currently selected CPU architecture.
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*
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* On little endian architectures, this macro does nothing.
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*
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* \note This macro is designed for compile-time conversion of data - for run time endianness
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* conversion, use \ref le16_to_cpu instead.
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*
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* \ingroup Group_EndianConversion
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*
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* \param[in] x Data to perform the endianness conversion on.
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*
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* \return Endian corrected version of the input value.
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*/
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#define LE16_TO_CPU(x) (x)
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/** Performs a conversion between a Little Endian encoded 32-bit piece of data and the
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* Endianness of the currently selected CPU architecture.
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*
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* On little endian architectures, this macro does nothing.
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*
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* \note This macro is designed for compile-time conversion of data - for run time endianness
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* conversion, use \ref le32_to_cpu instead.
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*
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* \ingroup Group_EndianConversion
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*
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* \param[in] x Data to perform the endianness conversion on.
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*
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* \return Endian corrected version of the input value.
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*/
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#define LE32_TO_CPU(x) (x)
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/** Performs a conversion between a Big Endian encoded 16-bit piece of data and the
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* Endianness of the currently selected CPU architecture.
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*
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* On big endian architectures, this macro does nothing.
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*
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* \note This macro is designed for compile-time conversion of data - for run-time endianness
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* conversion, use \ref be16_to_cpu instead.
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*
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* \ingroup Group_EndianConversion
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*
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* \param[in] x Data to perform the endianness conversion on.
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*
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* \return Endian corrected version of the input value.
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*/
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#define BE16_TO_CPU(x) SWAPENDIAN_16(x)
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/** Performs a conversion between a Big Endian encoded 32-bit piece of data and the
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* Endianness of the currently selected CPU architecture.
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*
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* On big endian architectures, this macro does nothing.
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*
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* \note This macro is designed for compile-time conversion of data - for run-time endianness
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* conversion, use \ref be32_to_cpu instead.
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*
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* \ingroup Group_EndianConversion
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*
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* \param[in] x Data to perform the endianness conversion on.
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*
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* \return Endian corrected version of the input value.
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*/
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#define BE32_TO_CPU(x) SWAPENDIAN_32(x)
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/** Performs a conversion on a natively encoded 16-bit piece of data to ensure that it
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* is in Little Endian format regardless of the currently selected CPU architecture.
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*
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* On little endian architectures, this macro does nothing.
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*
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* \note This macro is designed for compile-time conversion of data - for run-time endianness
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* conversion, use \ref cpu_to_le16 instead.
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*
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* \ingroup Group_EndianConversion
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*
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* \param[in] x Data to perform the endianness conversion on.
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*
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* \return Endian corrected version of the input value.
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*/
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#define CPU_TO_LE16(x) (x)
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/** Performs a conversion on a natively encoded 32-bit piece of data to ensure that it
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* is in Little Endian format regardless of the currently selected CPU architecture.
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*
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* On little endian architectures, this macro does nothing.
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*
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* \note This macro is designed for compile-time conversion of data - for run-time endianness
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* conversion, use \ref cpu_to_le32 instead.
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*
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* \ingroup Group_EndianConversion
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*
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* \param[in] x Data to perform the endianness conversion on.
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*
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* \return Endian corrected version of the input value.
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*/
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#define CPU_TO_LE32(x) (x)
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/** Performs a conversion on a natively encoded 16-bit piece of data to ensure that it
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* is in Big Endian format regardless of the currently selected CPU architecture.
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*
|
||
|
|
* On big endian architectures, this macro does nothing.
|
||
|
|
*
|
||
|
|
* \note This macro is designed for compile-time conversion of data - for run-time endianness
|
||
|
|
* conversion, use \ref cpu_to_be16 instead.
|
||
|
|
*
|
||
|
|
* \ingroup Group_EndianConversion
|
||
|
|
*
|
||
|
|
* \param[in] x Data to perform the endianness conversion on.
|
||
|
|
*
|
||
|
|
* \return Endian corrected version of the input value.
|
||
|
|
*/
|
||
|
|
#define CPU_TO_BE16(x) SWAPENDIAN_16(x)
|
||
|
|
|
||
|
|
/** Performs a conversion on a natively encoded 32-bit piece of data to ensure that it
|
||
|
|
* is in Big Endian format regardless of the currently selected CPU architecture.
|
||
|
|
*
|
||
|
|
* On big endian architectures, this macro does nothing.
|
||
|
|
*
|
||
|
|
* \note This macro is designed for compile-time conversion of data - for run-time endianness
|
||
|
|
* conversion, use \ref cpu_to_be32 instead.
|
||
|
|
*
|
||
|
|
* \ingroup Group_EndianConversion
|
||
|
|
*
|
||
|
|
* \param[in] x Data to perform the endianness conversion on.
|
||
|
|
*
|
||
|
|
* \return Endian corrected version of the input value.
|
||
|
|
*/
|
||
|
|
#define CPU_TO_BE32(x) SWAPENDIAN_32(x)
|
||
|
|
|
||
|
|
//! @}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Inline Functions: */
|
||
|
|
/** Function to reverse the byte ordering of the individual bytes in a 16 bit value.
|
||
|
|
*
|
||
|
|
* \ingroup Group_ByteSwapping
|
||
|
|
*
|
||
|
|
* \param[in] Word Word of data whose bytes are to be swapped.
|
||
|
|
*
|
||
|
|
* \return Input data with the individual bytes reversed.
|
||
|
|
*/
|
||
|
|
static inline uint16_t SwapEndian_16(const uint16_t Word) ATTR_WARN_UNUSED_RESULT ATTR_CONST;
|
||
|
|
static inline uint16_t SwapEndian_16(const uint16_t Word)
|
||
|
|
{
|
||
|
|
if (GCC_IS_COMPILE_CONST(Word))
|
||
|
|
return SWAPENDIAN_16(Word);
|
||
|
|
|
||
|
|
uint8_t Temp;
|
||
|
|
|
||
|
|
union
|
||
|
|
{
|
||
|
|
uint16_t Word;
|
||
|
|
uint8_t Bytes[2];
|
||
|
|
} Data;
|
||
|
|
|
||
|
|
Data.Word = Word;
|
||
|
|
|
||
|
|
Temp = Data.Bytes[0];
|
||
|
|
Data.Bytes[0] = Data.Bytes[1];
|
||
|
|
Data.Bytes[1] = Temp;
|
||
|
|
|
||
|
|
return Data.Word;
|
||
|
|
}
|
||
|
|
|
||
|
|
/** Function to reverse the byte ordering of the individual bytes in a 32 bit value.
|
||
|
|
*
|
||
|
|
* \ingroup Group_ByteSwapping
|
||
|
|
*
|
||
|
|
* \param[in] DWord Double word of data whose bytes are to be swapped.
|
||
|
|
*
|
||
|
|
* \return Input data with the individual bytes reversed.
|
||
|
|
*/
|
||
|
|
static inline uint32_t SwapEndian_32(const uint32_t DWord) ATTR_WARN_UNUSED_RESULT ATTR_CONST;
|
||
|
|
static inline uint32_t SwapEndian_32(const uint32_t DWord)
|
||
|
|
{
|
||
|
|
if (GCC_IS_COMPILE_CONST(DWord))
|
||
|
|
return SWAPENDIAN_32(DWord);
|
||
|
|
|
||
|
|
uint8_t Temp;
|
||
|
|
|
||
|
|
union
|
||
|
|
{
|
||
|
|
uint32_t DWord;
|
||
|
|
uint8_t Bytes[4];
|
||
|
|
} Data;
|
||
|
|
|
||
|
|
Data.DWord = DWord;
|
||
|
|
|
||
|
|
Temp = Data.Bytes[0];
|
||
|
|
Data.Bytes[0] = Data.Bytes[3];
|
||
|
|
Data.Bytes[3] = Temp;
|
||
|
|
|
||
|
|
Temp = Data.Bytes[1];
|
||
|
|
Data.Bytes[1] = Data.Bytes[2];
|
||
|
|
Data.Bytes[2] = Temp;
|
||
|
|
|
||
|
|
return Data.DWord;
|
||
|
|
}
|
||
|
|
|
||
|
|
/** Function to reverse the byte ordering of the individual bytes in a n byte value.
|
||
|
|
*
|
||
|
|
* \ingroup Group_ByteSwapping
|
||
|
|
*
|
||
|
|
* \param[in,out] Data Pointer to a number containing an even number of bytes to be reversed.
|
||
|
|
* \param[in] Length Length of the data in bytes.
|
||
|
|
*
|
||
|
|
* \return Input data with the individual bytes reversed.
|
||
|
|
*/
|
||
|
|
static inline void SwapEndian_n(void* const Data,
|
||
|
|
uint8_t Length) ATTR_NON_NULL_PTR_ARG(1);
|
||
|
|
static inline void SwapEndian_n(void* const Data,
|
||
|
|
uint8_t Length)
|
||
|
|
{
|
||
|
|
uint8_t* CurrDataPos = (uint8_t*)Data;
|
||
|
|
|
||
|
|
while (Length > 1)
|
||
|
|
{
|
||
|
|
uint8_t Temp = *CurrDataPos;
|
||
|
|
*CurrDataPos = *(CurrDataPos + Length - 1);
|
||
|
|
*(CurrDataPos + Length - 1) = Temp;
|
||
|
|
|
||
|
|
CurrDataPos++;
|
||
|
|
Length -= 2;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Disable C linkage for C++ Compilers: */
|
||
|
|
#if defined(__cplusplus)
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/** @} */
|
||
|
|
|