Add experimental support for the UC3A0, UC3A1 and UC3A3 series AVR32 microcontrollers.

[pub/USBasp.git] / LUFA / Common / Common.h

diff --git a/LUFA/Common/Common.h b/LUFA/Common/Common.h
index c2eeead..80bafce 100644 (file)
--- a/LUFA/Common/Common.h
+++ b/LUFA/Common/Common.h
@@ -214,6 +214,12 @@
                         */
                        #define GCC_FORCE_POINTER_ACCESS(StructPtr) __asm__ __volatile__("" : "=b" (StructPtr) : "0" (StructPtr))
 
+                       /** Forces GCC to create a memory barrier, ensuring that memory accesses are not reordered past the barrier point.
+                        *  This can be used before ordering-critical operations, to ensure that the compiler does not re-order the resulting
+                        *  assembly output in an unexpected manner on sections of code that are ordering-specific.
+                        */
+                       #define GCC_MEMORY_BARRIER()                __asm__ __volatile__("" ::: "memory");
+
                /* 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,
                         *  etc.