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Diffstat (limited to 'protocol/lufa/LUFA-120730/LUFA/Common/Endianness.h')
| -rw-r--r-- | protocol/lufa/LUFA-120730/LUFA/Common/Endianness.h | 489 |
1 files changed, 489 insertions, 0 deletions
diff --git a/protocol/lufa/LUFA-120730/LUFA/Common/Endianness.h b/protocol/lufa/LUFA-120730/LUFA/Common/Endianness.h new file mode 100644 index 0000000000..d0812e4e3b --- /dev/null +++ b/protocol/lufa/LUFA-120730/LUFA/Common/Endianness.h @@ -0,0 +1,489 @@ +/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2012.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ Copyright 2012 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, distribute, and sell this
+ software and its documentation for any purpose is hereby granted
+ without fee, provided that the above copyright notice appear in
+ all copies and that both that the copyright notice and this
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
+ software without specific, written prior permission.
+
+ The author disclaim all warranties with regard to this
+ software, including all implied warranties of merchantability
+ and fitness. In no event shall the author be liable for any
+ special, indirect or consequential damages or any damages
+ whatsoever resulting from loss of use, data or profits, whether
+ in an action of contract, negligence or other tortious action,
+ arising out of or in connection with the use or performance of
+ this software.
+*/
+
+/** \file
+ * \brief Endianness and Byte Ordering macros and functions.
+ *
+ * \copydetails Group_Endianness
+ */
+
+/** \ingroup Group_Endianness
+ * \defgroup Group_ByteSwapping Byte Reordering
+ * \brief Macros and functions for forced byte reordering.
+ */
+
+/** \ingroup Group_Endianness
+ * \defgroup Group_EndianConversion Endianness Conversion
+ * \brief Macros and functions for automatic endianness conversion.
+ */
+
+/** \ingroup Group_Common
+ * \defgroup Group_Endianness Endianness and Byte Ordering
+ * \brief Convenience macros and functions relating to byte (re-)ordering
+ *
+ * Common library convenience macros and functions relating to byte (re-)ordering.
+ *
+ * @{
+ */
+
+#ifndef __LUFA_ENDIANNESS_H__
+#define __LUFA_ENDIANNESS_H__
+
+ /* Enable C linkage for C++ Compilers: */
+ #if defined(__cplusplus)
+ extern "C" {
+ #endif
+
+ /* Preprocessor Checks: */
+ #if !defined(__INCLUDE_FROM_COMMON_H)
+ #error Do not include this file directly. Include LUFA/Common/Common.h instead to gain this functionality.
+ #endif
+
+ #if !(defined(ARCH_BIG_ENDIAN) || defined(ARCH_LITTLE_ENDIAN))
+ #error ARCH_BIG_ENDIAN or ARCH_LITTLE_ENDIAN not set for the specified architecture.
+ #endif
+
+ /* Public Interface - May be used in end-application: */
+ /* Macros: */
+ /** Swaps the byte ordering of a 16-bit value at compile-time. Do not use this macro for swapping byte orderings
+ * of dynamic values computed at runtime, use \ref SwapEndian_16() instead. The result of this macro can be used
+ * inside struct or other variable initializers outside of a function, something that is not possible with the
+ * inline function variant.
+ *
+ * \ingroup Group_ByteSwapping
+ *
+ * \param[in] x 16-bit value whose byte ordering is to be swapped.
+ *
+ * \return Input value with the byte ordering reversed.
+ */
+ #define SWAPENDIAN_16(x) (uint16_t)((((x) & 0xFF00) >> 8) | (((x) & 0x00FF) << 8))
+
+ /** Swaps the byte ordering of a 32-bit value at compile-time. Do not use this macro for swapping byte orderings
+ * of dynamic values computed at runtime- use \ref SwapEndian_32() instead. The result of this macro can be used
+ * inside struct or other variable initializers outside of a function, something that is not possible with the
+ * inline function variant.
+ *
+ * \ingroup Group_ByteSwapping
+ *
+ * \param[in] x 32-bit value whose byte ordering is to be swapped.
+ *
+ * \return Input value with the byte ordering reversed.
+ */
+ #define SWAPENDIAN_32(x) (uint32_t)((((x) & 0xFF000000UL) >> 24UL) | (((x) & 0x00FF0000UL) >> 8UL) | \
+ (((x) & 0x0000FF00UL) << 8UL) | (((x) & 0x000000FFUL) << 24UL))
+
+ #if defined(ARCH_BIG_ENDIAN) && !defined(le16_to_cpu)
+ #define le16_to_cpu(x) SwapEndian_16(x)
+ #define le32_to_cpu(x) SwapEndian_32(x)
+ #define be16_to_cpu(x) (x)
+ #define be32_to_cpu(x) (x)
+ #define cpu_to_le16(x) SwapEndian_16(x)
+ #define cpu_to_le32(x) SwapEndian_32(x)
+ #define cpu_to_be16(x) (x)
+ #define cpu_to_be32(x) (x)
+ #define LE16_TO_CPU(x) SWAPENDIAN_16(x)
+ #define LE32_TO_CPU(x) SWAPENDIAN_32(x)
+ #define BE16_TO_CPU(x) (x)
+ #define BE32_TO_CPU(x) (x)
+ #define CPU_TO_LE16(x) SWAPENDIAN_16(x)
+ #define CPU_TO_LE32(x) SWAPENDIAN_32(x)
+ #define CPU_TO_BE16(x) (x)
+ #define CPU_TO_BE32(x) (x)
+ #elif !defined(le16_to_cpu)
+ /** \name Run-time endianness conversion */
+ //@{
+
+ /** Performs a conversion between a Little Endian encoded 16-bit piece of data and the
+ * Endianness of the currently selected CPU architecture.
+ *
+ * On little endian architectures, this macro does nothing.
+ *
+ * \note This macro is designed for run-time conversion of data - for compile-time endianness
+ * conversion, use \ref LE16_TO_CPU instead.
+ *
+ * \ingroup Group_EndianConversion
+ *
+ * \param[in] x Data to perform the endianness conversion on.
+ *
+ * \return Endian corrected version of the input value.
+ */
+ #define le16_to_cpu(x) (x)
+
+ /** Performs a conversion between a Little Endian encoded 32-bit piece of data and the
+ * Endianness of the currently selected CPU architecture.
+ *
+ * On little endian architectures, this macro does nothing.
+ *
+ * \note This macro is designed for run-time conversion of data - for compile-time endianness
+ * conversion, use \ref LE32_TO_CPU instead.
+ *
+ * \ingroup Group_EndianConversion
+ *
+ * \param[in] x Data to perform the endianness conversion on.
+ *
+ * \return Endian corrected version of the input value.
+ */
+ #define le32_to_cpu(x) (x)
+
+ /** Performs a conversion between a Big Endian encoded 16-bit piece of data and the
+ * Endianness of the currently selected CPU architecture.
+ *
+ * On big endian architectures, this macro does nothing.
+ *
+ * \note This macro is designed for run-time conversion of data - for compile-time endianness
+ * conversion, use \ref BE16_TO_CPU instead.
+ *
+ * \ingroup Group_EndianConversion
+ *
+ * \param[in] x Data to perform the endianness conversion on.
+ *
+ * \return Endian corrected version of the input value.
+ */
+ #define be16_to_cpu(x) SwapEndian_16(x)
+
+ /** Performs a conversion between a Big Endian encoded 32-bit piece of data and the
+ * Endianness of the currently selected CPU architecture.
+ *
+ * On big endian architectures, this macro does nothing.
+ *
+ * \note This macro is designed for run-time conversion of data - for compile-time endianness
+ * conversion, use \ref BE32_TO_CPU instead.
+ *
+ * \ingroup Group_EndianConversion
+ *
+ * \param[in] x Data to perform the endianness conversion on.
+ *
+ * \return Endian corrected version of the input value.
+ */
+ #define be32_to_cpu(x) SwapEndian_32(x)
+
+ /** Performs a conversion on a natively encoded 16-bit piece of data to ensure that it
+ * is in Little Endian format regardless of the currently selected CPU architecture.
+ *
+ * On little endian architectures, this macro does nothing.
+ *
+ * \note This macro is designed for run-time conversion of data - for compile-time endianness
+ * conversion, use \ref CPU_TO_LE16 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_le16(x) (x)
+
+ /** Performs a conversion on a natively encoded 32-bit piece of data to ensure that it
+ * is in Little Endian format regardless of the currently selected CPU architecture.
+ *
+ * On little endian architectures, this macro does nothing.
+ *
+ * \note This macro is designed for run-time conversion of data - for compile-time endianness
+ * conversion, use \ref CPU_TO_LE32 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_le32(x) (x)
+
+ /** Performs a conversion on a natively encoded 16-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 run-time conversion of data - for compile-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 run-time conversion of data - for compile-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)
+
+ //@}
+
+ /** \name Compile-time endianness conversion */
+ //@{
+
+ /** Performs a conversion between a Little Endian encoded 16-bit piece of data and the
+ * Endianness of the currently selected CPU architecture.
+ *
+ * On little endian architectures, this macro does nothing.
+ *
+ * \note This macro is designed for compile-time conversion of data - for run time endianness
+ * conversion, use \ref le16_to_cpu instead.
+ *
+ * \ingroup Group_EndianConversion
+ *
+ * \param[in] x Data to perform the endianness conversion on.
+ *
+ * \return Endian corrected version of the input value.
+ */
+ #define LE16_TO_CPU(x) (x)
+
+ /** Performs a conversion between a Little Endian encoded 32-bit piece of data and the
+ * Endianness of the currently selected CPU architecture.
+ *
+ * On little endian architectures, this macro does nothing.
+ *
+ * \note This macro is designed for compile-time conversion of data - for run time endianness
+ * conversion, use \ref le32_to_cpu instead.
+ *
+ * \ingroup Group_EndianConversion
+ *
+ * \param[in] x Data to perform the endianness conversion on.
+ *
+ * \return Endian corrected version of the input value.
+ */
+ #define LE32_TO_CPU(x) (x)
+
+ /** Performs a conversion between a Big Endian encoded 16-bit piece of data and the
+ * Endianness 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 be16_to_cpu instead.
+ *
+ * \ingroup Group_EndianConversion
+ *
+ * \param[in] x Data to perform the endianness conversion on.
+ *
+ * \return Endian corrected version of the input value.
+ */
+ #define BE16_TO_CPU(x) SWAPENDIAN_16(x)
+
+ /** Performs a conversion between a Big Endian encoded 32-bit piece of data and the
+ * Endianness 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 be32_to_cpu instead.
+ *
+ * \ingroup Group_EndianConversion
+ *
+ * \param[in] x Data to perform the endianness conversion on.
+ *
+ * \return Endian corrected version of the input value.
+ */
+ #define BE32_TO_CPU(x) SWAPENDIAN_32(x)
+
+ /** Performs a conversion on a natively encoded 16-bit piece of data to ensure that it
+ * is in Little Endian format regardless of the currently selected CPU architecture.
+ *
+ * On little 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_le16 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_LE16(x) (x)
+
+ /** Performs a conversion on a natively encoded 32-bit piece of data to ensure that it
+ * is in Little Endian format regardless of the currently selected CPU architecture.
+ *
+ * On little 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_le32 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_LE32(x) (x)
+
+ /** Performs a conversion on a natively encoded 16-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_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
+
+/** @} */
+
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