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Added new pgm_read_ptr() macro to Common.h for reading of pointers out of flash memory space.

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Added new SWAPENDIAN_16() and SWAPENDIAN_32() macros to Common.h for statically initialized variables at compile time.
This commit is contained in:
Dean Camera 2010-06-22 07:06:27 +00:00
parent 988604b25d
commit e621ab33be
5 changed files with 44 additions and 34 deletions
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41
LUFA/Common/Common.h
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@ -107,10 +107,45 @@
*
* \ingroup Group_Debugging
*/
#define STDOUT_ASSERT(x) MACROS{ if (!(x)) { printf_P(PSTR("%s: Function \"%s\", Line %d: " \
#define STDOUT_ASSERT(x) MACROS{ if (!(x)) { printf_P(PSTR("%s: Function \"%s\", Line %d: " \
"Assertion \"%s\" failed.\r\n"), \
__FILE__, __func__, __LINE__, #x); } \
}MACROE
__FILE__, __func__, __LINE__, #x); } }MACROE
#if !defined(pgm_read_ptr) || defined(__DOXYGEN__)
/** Reads a pointer out of PROGMEM space. This is currently a wrapper for the avr-libc pgm_read_ptr()
* macro with a void* cast, so that its value can be assigned diretly to a pointer variable or used
* in pointer arithmetic without further casting in C. In a future avr-libc distribution this will be
* part of the standard API and will be implemented in a more formal manner.
*
* \param[in] Addr Address of the pointer to read.
*
* \return Pointer retrieved from PROGMEM space.
*/
#define pgm_read_ptr(Addr) (void*)pgm_read_word(Addr)
#endif
/** 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.
*
* \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) ((((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.
*
* \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) ((((x) & 0xFF000000UL) >> 24UL) | (((x) & 0x00FF0000UL) >> 8UL) | \
(((x) & 0x0000FF00UL) << 8UL) | (((x) & 0x000000FFUL) << 24UL))
/* Inline Functions: */
/** Function to reverse the individual bits in a byte - i.e. bit 7 is moved to bit 0, bit 6 to bit 1,