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Add endian handling helpers

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This commit is contained in:
Henrik Stickann 2022-04-19 23:17:10 +02:00
parent e8cbdf261c
commit 867d884d67
1 changed files with 219 additions and 0 deletions
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219
include/sta/endian.hpp Normal file
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#ifndef STA_ENDIAN_HPP
#define STA_ENDIAN_HPP
#include <sta/config.hpp>
#if !defined(STA_MCU_BIG_ENDIAN) && !defined(STA_MCU_LITTLE_ENDIAN)
# error "Endian-ness unknown. Please specify in <sta/config.hpp>"
#endif // !STA_MCU_BIG_ENDIAN && !STA_MCU_LITTLE_ENDIAN
/**
* @brief Get 16-bit value with swapped byte order.
*
* @param u16 16-bit input value
* @return 16-bit value w/ swapped byte order
*/
#define STA_UINT16_SWAP_BYTE_ORDER(u16) \
( \
((u16 & 0x00FF) << 8) \
| ((u16 & 0xFF00) >> 8) \
)
/**
* @brief Get 32-bit value with swapped byte order.
*
* @param u32 32-bit input value
* @return 32-bit value w/ swapped byte order
*/
#define STA_UINT32_SWAP_BYTE_ORDER(u32) \
( \
((u32 & 0x000000FF) << 24) \
| ((u32 & 0x0000FF00) << 8) \
| ((u32 & 0x00FF0000) >> 8) \
| ((u32 & 0xFF000000) >> 24) \
)
/**
* @brief Get initializer list for byte array with big-endian byte order from 16-bit value.
*
* @param u16 16-bit input value
* @return Initializer list for uint8_t[2]
*/
#define STA_UINT16_TO_BYTES_BE(u16) \
{ \
static_cast<uint8_t>(u16 >> 8), \
static_cast<uint8_t>(u16) \
}
/**
* @brief Get initializer list for byte array with little-endian byte order from 16-bit value.
*
* @param u16 16-bit input value
* @return Initializer list for uint8_t[2]
*/
#define STA_UINT16_TO_BYTES_LE(u16) \
{ \
static_cast<uint8_t>(u16), \
static_cast<uint8_t>(u16 >> 8) \
}
/**
* @brief Get initializer list for byte array with big-endian byte order from 32-bit value.
*
* @param u32 32-bit input value
* @return Initializer list for uint8_t[4]
*/
#define STA_UINT32_TO_BYTES_BE(u32) \
{ \
static_cast<uint8_t>(u32 >> 24), \
static_cast<uint8_t>(u32 >> 16), \
static_cast<uint8_t>(u32 >> 8), \
static_cast<uint8_t>(u32) \
}
/**
* @brief Get initializer list for byte array with little-endian byte order from 32-bit value.
*
* @param u32 32-bit input value
* @return Initializer list for uint8_t[4]
*/
#define STA_UINT32_TO_BYTES_LE(u32) \
{ \
static_cast<uint8_t>(u32), \
static_cast<uint8_t>(u32 >> 8), \
static_cast<uint8_t>(u32 >> 16), \
static_cast<uint8_t>(u32 >> 24) \
}
#ifdef STA_MCU_LITTLE_ENDIAN
/**
* @brief Convert 16-bit value to big-endian byte order.
*
* @param u16 16-bit input value
* @return 16-bit value w/ big-endian byte order
*/
# define STA_UINT16_TO_BE(u16) STA_UINT16_SWAP_BYTE_ORDER(u16)
/**
* @brief Convert 16-bit value to little-endian byte order.
*
* @param u16 16-bit input value
* @return 16-bit value w/ little-endian byte order
*/
# define STA_UINT16_TO_LE(u16) (u16)
/**
* @brief Get initializer list for byte array w/ MCU byte order from 16-bit value.
*
* @param u16 16-bit input value
* @return Initializer list for uint8_t[2]
*/
# define STA_UINT16_TO_BYTES(u16) STA_UINT16_TO_BYTES_LE(u16)
/**
* @brief Get initializer list for byte array w/ swapped MCU byte order from 16-bit value.
*
* @param u16 16-bit input value
* @return Initializer list for uint8_t[2]
*/
# define STA_UINT16_TO_BYTES_SWAP(u16) STA_UINT16_TO_BYTES_BE(u16)
/**
* @brief Convert 32-bit value to big-endian byte order.
*
* @param u32 32-bit input value
* @return 32-bit value w/ big-endian byte order
*/
# define STA_UINT32_TO_BE(u32) STA_UINT32_SWAP_BYTE_ORDER(u32)
/**
* @brief Convert 32-bit value to little-endian byte order.
*
* @param u32 32-bit input value
* @return 32-bit value w/ little-endian byte order
*/
# define STA_UINT32_TO_LE(u32) (u32)
/**
* @brief Get initializer list for byte array from 32-bit value.
*
* @param u32 32-bit input value
* @return Initializer list for uint8_t[4]
*/
# define STA_UINT32_TO_BYTES(u32) STA_UINT32_TO_BYTES_LE(u32)
/**
* @brief Get initializer list for byte array w/ swapped byte order from 32-bit value.
*
* @param u32 32-bit input value
* @return Initializer list for uint8_t[4]
*/
# define STA_UINT32_TO_BYTES_SWAP(u32) STA_UINT32_TO_BYTES_BE(u32)
#elif STA_MCU_BIG_ENDIAN
/**
* @brief Convert 16-bit value to big-endian byte order.
*
* @param u16 16-bit input value
* @return 16-bit value w/ big-endian byte order
*/
# define STA_UINT16_TO_BE(u16) (u16)
/**
* @brief Convert 16-bit value to little-endian byte order.
*
* @param u16 16-bit input value
* @return 16-bit value w/ little-endian byte order
*/
# define STA_UINT16_TO_LE(u16) STA_UINT16_SWAP_BYTE_ORDER(u16)
/**
* @brief Get initializer list for byte array w/ MCU byte order from 16-bit value.
*
* @param u16 16-bit input value
* @return Initializer list for uint8_t[2]
*/
# define STA_UINT16_TO_BYTES(u16) STA_UINT16_TO_BYTES_BE(u16)
/**
* @brief Get initializer list for byte array w/ swapped MCU byte order from 16-bit value.
*
* @param u16 16-bit input value
* @return Initializer list for uint8_t[2]
*/
# define STA_UINT16_TO_BYTES_SWAP(u16) STA_UINT16_TO_BYTES_LE(u16)
/**
* @brief Convert 32-bit value to big-endian byte order.
*
* @param u32 32-bit input value
* @return 32-bit value w/ big-endian byte order
*/
# define STA_UINT32_TO_BE(u32) (u32)
/**
* @brief Convert 32-bit value to little-endian byte order.
*
* @param u32 32-bit input value
* @return 32-bit value w/ little-endian byte order
*/
# define STA_UINT32_TO_LE(u32) STA_UINT32_SWAP_BYTE_ORDER(u32)
/**
* @brief Get initializer list for byte array from 32-bit value.
*
* @param u32 32-bit input value
* @return Initializer list for uint8_t[4]
*/
# define STA_UINT32_TO_BYTES(u32) STA_UINT32_TO_BYTES_BE(u32)
/**
* @brief Get initializer list for byte array w/ swapped byte order from 32-bit value.
*
* @param u32 32-bit input value
* @return Initializer list for uint8_t[4]
*/
# define STA_UINT32_TO_BYTES_SWAP(u32) STA_UINT32_TO_BYTES_LE(u32)
#endif // STA_MCU_BIG_ENDIAN
#endif // STA_ENDIAN_HPP