📄 lib_mem.h
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* MEM_VAL_COPY_GET_INTU_xxx()
*
* Description : Copy & decode data values from any CPU memory address to any CPU memory address for
* any sized data values.
*
* Argument(s) : addr_dest Lowest CPU memory address to copy/decode source address's data value
* (see Notes #2 & #3).
*
* addr_src Lowest CPU memory address of data value to copy/decode
* (see Notes #2 & #3).
*
* val_size Number of data value octets to copy/decode.
*
* Return(s) : none.
*
* Caller(s) : Application.
*
* Note(s) : (1) Copy/decode data values based on the values' data-word order :
*
* MEM_VAL_COPY_GET_INTU_BIG() Decode big- endian data values -- data words' most
* significant octet @ lowest memory address
* MEM_VAL_COPY_GET_INTU_LITTLE() Decode little-endian data values -- data words' least
* significant octet @ lowest memory address
* MEM_VAL_COPY_GET_INTU() Decode data values using CPU's native or configured
* data-word order
*
* See also 'cpu.h CPU WORD CONFIGURATION Note #2'.
*
* (2) (a) CPU memory addresses/pointers NOT checked for NULL.
*
* (b) CPU memory addresses/buffers NOT checked for overlapping.
*
* (1) IEEE Std 1003.1, 2004 Edition, Section 'memcpy() : DESCRIPTION' states that
* "copying ... between objects that overlap ... is undefined".
*
* (3) MEM_VAL_COPY_GET_INTU_xxx() macro's copy/decode data values without regard to CPU word-
* aligned addresses. Thus for processors that require data word alignment, data words
* can be copied/decoded to/from any CPU address, word-aligned or not, without generating
* data-word-alignment exceptions/faults.
*
* (4) MEM_VAL_COPY_GET_xxx() macro's are more efficient than MEM_VAL_COPY_GET_INTU_xxx()
* macro's & SHOULD be used whenever possible.
*
* See also 'MEM_VAL_COPY_GET_xxx() Note #4'.
*
* (5) Since octet-order copy/conversion are inverse operations, MEM_VAL_COPY_GET_INTU_xxx() &
* MEM_VAL_COPY_SET_INTU_xxx() macros are inverse, but identical, operations & are provided
* in both forms for semantics & consistency.
*
* See also 'MEM_VAL_COPY_SET_INTU_xxx() Note #5'.
*
* (6) MEM_VAL_COPY_GET_INTU_xxx() macro's are NOT atomic operations & MUST NOT be used on any
* non-static (i.e. volatile) variables, registers, hardware, etc.; without the caller of
* the macro's providing some form of additional protection (e.g. mutual exclusion).
*
* (7) The 'CPU_CFG_ENDIAN_TYPE' pre-processor 'else'-conditional code SHOULD never be compiled/
* linked since each 'cpu.h' SHOULD ensure that the CPU data-word-memory order configuration
* constant (CPU_CFG_ENDIAN_TYPE) is configured with an appropriate data-word-memory order
* value (see 'cpu.h CPU WORD CONFIGURATION Note #2'). The 'else'-conditional code is
* included as an extra precaution in case 'cpu.h' is incorrectly configured.
*********************************************************************************************************
*/
/*$PAGE*/
#if (CPU_CFG_ENDIAN_TYPE == CPU_ENDIAN_TYPE_BIG)
#define MEM_VAL_COPY_GET_INTU_BIG(addr_dest, addr_src, val_size) do { \
CPU_SIZE_T i; \
\
for (i = 0; i < (val_size); i++) { \
(*(((CPU_INT08U *)(addr_dest)) + i)) = (*(((CPU_INT08U *)(addr_src)) + i)); \
} \
} while (0)
#define MEM_VAL_COPY_GET_INTU_LITTLE(addr_dest, addr_src, val_size) do { \
CPU_SIZE_T i; \
CPU_SIZE_T j; \
\
for (i = 0, j = (val_size) - 1; i < (val_size); i++, j--) { \
(*(((CPU_INT08U *)(addr_dest)) + i)) = (*(((CPU_INT08U *)(addr_src)) + j)); \
} \
} while (0)
#define MEM_VAL_COPY_GET_INTU(addr_dest, addr_src, val_size) MEM_VAL_COPY_GET_INTU_BIG(addr_dest, addr_src, val_size)
#elif (CPU_CFG_ENDIAN_TYPE == CPU_ENDIAN_TYPE_LITTLE)
#define MEM_VAL_COPY_GET_INTU_BIG(addr_dest, addr_src, val_size) do { \
CPU_SIZE_T i; \
CPU_SIZE_T j; \
\
for (i = 0, j = (val_size) - 1; i < (val_size); i++, j--) { \
(*(((CPU_INT08U *)(addr_dest)) + i)) = (*(((CPU_INT08U *)(addr_src)) + j)); \
} \
} while (0)
#define MEM_VAL_COPY_GET_INTU_LITTLE(addr_dest, addr_src, val_size) do { \
CPU_SIZE_T i; \
\
for (i = 0; i < (val_size); i++) { \
(*(((CPU_INT08U *)(addr_dest)) + i)) = (*(((CPU_INT08U *)(addr_src)) + i)); \
} \
} while (0)
#define MEM_VAL_COPY_GET_INTU(addr_dest, addr_src, val_size) MEM_VAL_COPY_GET_INTU_LITTLE(addr_dest, addr_src, val_size)
#else /* See Note #7. */
#error "CPU_CFG_ENDIAN_TYPE illegally #defined in 'cpu.h' "
#error " [See 'cpu.h CONFIGURATION ERRORS']"
#endif
/*$PAGE*/
/*
*********************************************************************************************************
* MEM_VAL_COPY_SET_xxx()
*
* Description : Copy & encode data values from any CPU memory address to any CPU memory address.
*
* Argument(s) : addr_dest Lowest CPU memory address to copy/encode source address's data value
* (see Notes #2 & #3).
*
* addr_src Lowest CPU memory address of data value to copy/encode
* (see Notes #2 & #3).
*
* Return(s) : none.
*
* Caller(s) : Application.
*
* Note(s) : (1) Copy/encode data values based on the values' data-word order :
*
* MEM_VAL_COPY_SET_xxx_BIG() Encode big- endian data values -- data words' most
* significant octet @ lowest memory address
* MEM_VAL_COPY_SET_xxx_LITTLE() Encode little-endian data values -- data words' least
* significant octet @ lowest memory address
* MEM_VAL_COPY_SET_xxx() Encode data values using CPU's native or configured
* data-word order
*
* See also 'cpu.h CPU WORD CONFIGURATION Note #2'.
*
* (2) (a) CPU memory addresses/pointers NOT checked for NULL.
*
* (b) CPU memory addresses/buffers NOT checked for overlapping.
*
* (1) IEEE Std 1003.1, 2004 Edition, Section 'memcpy() : DESCRIPTION' states that
* "copying ... between objects that overlap ... is undefined".
*
* (3) MEM_VAL_COPY_SET_xxx() macro's copy/encode data values without regard to CPU word-aligned
* addresses. Thus for processors that require data word alignment, data words can be copied/
* encoded to/from any CPU address, word-aligned or not, without generating data-word-alignment
* exceptions/faults.
*
* (4) MEM_VAL_COPY_SET_xxx() macro's are more efficient than MEM_VAL_SET_xxx() macro's & are
* also independent of CPU data-word-alignment & SHOULD be used whenever possible.
*
* See also 'MEM_VAL_SET_xxx() Note #4'.
*
* (5) Since octet-order copy/conversion are inverse operations, MEM_VAL_COPY_GET_xxx() &
* MEM_VAL_COPY_SET_xxx() macros are inverse, but identical, operations & are provided
* in both forms for semantics & consistency.
*
* See also 'MEM_VAL_COPY_GET_xxx() Note #5'.
*
* (6) MEM_VAL_COPY_SET_xxx() macro's are NOT atomic operations & MUST NOT be used on any
* non-static (i.e. volatile) variables, registers, hardware, etc.; without the caller
* of the macro's providing some form of additional protection (e.g. mutual exclusion).
*********************************************************************************************************
*/
/* See Note #5. */
#define MEM_VAL_COPY_SET_INT08U_BIG(addr_dest, addr_src) MEM_VAL_COPY_GET_INT08U_BIG(addr_dest, addr_src)
#define MEM_VAL_COPY_SET_INT16U_BIG(addr_dest, addr_src) MEM_VAL_COPY_GET_INT16U_BIG(addr_dest, addr_src)
#define MEM_VAL_COPY_SET_INT32U_BIG(addr_dest, addr_src) MEM_VAL_COPY_GET_INT32U_BIG(addr_dest, addr_src)
#define MEM_VAL_COPY_SET_INT08U_LITTLE(addr_dest, addr_src) MEM_VAL_COPY_GET_INT08U_LITTLE(addr_dest, addr_src)
#define MEM_VAL_COPY_SET_INT16U_LITTLE(addr_dest, addr_src) MEM_VAL_COPY_GET_INT16U_LITTLE(addr_dest, addr_src)
#define MEM_VAL_COPY_SET_INT32U_LITTLE(addr_dest, addr_src) MEM_VAL_COPY_GET_INT32U_LITTLE(addr_dest, addr_src)
#define MEM_VAL_COPY_SET_INT08U(addr_dest, addr_src) MEM_VAL_COPY_GET_INT08U(addr_dest, addr_src)
#define MEM_VAL_COPY_SET_INT16U(addr_dest, addr_src) MEM_VAL_COPY_GET_INT16U(addr_dest, addr_src)
#define MEM_VAL_COPY_SET_INT32U(addr_dest, addr_src) MEM_VAL_COPY_GET_INT32U(addr_dest, addr_src)
/*$PAGE*/
/*
*********************************************************************************************************
* MEM_VAL_COPY_SET_INTU_xxx()
*
* Description : Copy & encode data values from any CPU memory address to any CPU memory address for
* any sized data valu⌨️ 快捷键说明
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