diff options
Diffstat (limited to 'LUFA/Common/Common.h')
| -rw-r--r-- | LUFA/Common/Common.h | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/LUFA/Common/Common.h b/LUFA/Common/Common.h index 3860eff67..f2e5e313d 100644 --- a/LUFA/Common/Common.h +++ b/LUFA/Common/Common.h @@ -85,14 +85,14 @@ * * \ingroup Group_Debugging */ - #define JTAG_DEBUG_POINT() __asm__ volatile ("NOP" ::) + #define JTAG_DEBUG_POINT() __asm__ __volatile__ ("NOP" ::) /** Defines an explicit JTAG break point in the resulting binary via the ASM BREAK statement. When * a JTAG is used, this causes the program execution to halt when reached until manually resumed. * * \ingroup Group_Debugging */ - #define JTAG_DEBUG_BREAK() __asm__ volatile ("BREAK" ::) + #define JTAG_DEBUG_BREAK() __asm__ __volatile__ ("BREAK" ::) /** Macro for testing condition "x" and breaking via JTAG_DEBUG_BREAK() if the condition is false. * @@ -111,6 +111,16 @@ #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 + + /** Forces GCC to use pointer indirection (via the AVR's pointer register pairs) when accessing the given + * struct pointer. In some cases GCC will emit non-optimal assembly code when accessing a structure through + * a pointer, resulting in a larger binary. When this macro is used on a (non-const) structure pointer before + * use, it will force GCC to use pointer indirection on the elements rather than direct store and load + * instructions. + * + * \param[in, out] StructPtr Pointer to a structure which is to be forced into indirect access mode. + */ + #define GCC_FORCE_POINTER_ACCESS(StructPtr) __asm__ __volatile__("" : "=b" (StructPtr) : "0" (StructPtr)) #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() |