+ __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 directly 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))
projects / pub / USBasp.git / blobdiff