X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=bertos%2Fcfg%2Fmacros.h;h=0dad9d393effcb3f44abfa7aa85264c342a27206;hb=3ddb5bbec1b0c60a21dbd1311a285e79ba546ccc;hp=9e8139688402d4e64d51c6e5e6dacb8b96149235;hpb=9a5999eef8da573fca01ea4b525b0eb39318eb87;p=bertos.git

diff --git a/bertos/cfg/macros.h b/bertos/cfg/macros.h
index 9e813968..0dad9d39 100644
--- 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. */