mirror of https://github.com/qmk/qmk_firmware
494 lines
18 KiB
C
494 lines
18 KiB
C
/*
|
|
LUFA Library
|
|
Copyright (C) Dean Camera, 2017.
|
|
|
|
dean [at] fourwalledcubicle [dot] com
|
|
www.lufa-lib.org
|
|
*/
|
|
|
|
/*
|
|
Copyright 2017 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 disclaims 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.
|
|
*
|
|
* \hideinitializer
|
|
*
|
|
* \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.
|
|
*
|
|
* \hideinitializer
|
|
*
|
|
* \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 ATTR_ALWAYS_INLINE;
|
|
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 ATTR_ALWAYS_INLINE;
|
|
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
|
|
|
|
/** @} */
|
|
|