X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=bertos%2Fcfg%2Fmacros.h;h=caa2340f4792bedae0214eabbeb94b3bd73bea68;hb=39279a8f7a3c0aa7c0dc2f56863e088568044d79;hp=9e8139688402d4e64d51c6e5e6dacb8b96149235;hpb=9a5999eef8da573fca01ea4b525b0eb39318eb87;p=bertos.git

diff --git a/bertos/cfg/macros.h b/bertos/cfg/macros.h
index 9e813968..caa2340f 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_UINT8(b) \
+	((uint8_t)((((b) * 0x0802UL & 0x22110UL) | ((b) * 0x8020UL & 0x88440UL)) * 0x10101UL >> 16))
 
 #ifndef BV
 	/** Convert a bit value to a binary flag. */
@@ -176,6 +182,13 @@
  */
 #define DIV_ROUND(dividend, divisor)  (((dividend) + (divisor) / 2) / (divisor))
 
+/**
+ * Perform an integer division rounding the result to the upper int value.
+ * \note \a divisor should preferibly be a costant, otherwise this macro generates
+ * 2 division. Also divisor is evaluated twice.
+ */
+#define DIV_ROUNDUP(dividend, divisor)  (((dividend) + (divisor) - 1) / (divisor))
+
 /** Round up \a x to an even multiple of the 2's power \a pad. */
 #define ROUND_UP2(x, pad) (((x) + ((pad) - 1)) & ~((pad) - 1))