Fix test.

[bertos.git] / bertos / cfg / macros.h

diff --git a/bertos/cfg/macros.h b/bertos/cfg/macros.h
index 9e8139688402d4e64d51c6e5e6dacb8b96149235..0dad9d393effcb3f44abfa7aa85264c342a27206 100644 (file)
--- a/bertos/cfg/macros.h
+++ b/bertos/cfg/macros.h
@@ -154,6 +154,12 @@
                (b) = tmp; \
        } while (0)
 
+/**
+ * Reverse the bits contained in b (LSB becomes the MSB and so on).
+ * \note \a b is evaluated twice
+ */
+#define REVERSE(b) \
+       ((uint8_t)((((b) * 0x0802UL & 0x22110UL) | ((b) * 0x8020UL & 0x88440UL)) * 0x10101UL >> 16))
 
 #ifndef BV
        /** Convert a bit value to a binary flag. */