The beginning of doxygenation:

As a first step, added an @file description for each file.

bacnet-stack/src/bacreal.c

@@ -42,6 +42,8 @@
 #include "bacint.h"
 #include "bacreal.h"
 
+/** @file bacreal.c  Encode/Decode Floating Point (Real) Types */
+
 /* NOTE: byte order plays a role in decoding multibyte values */
 /* http://www.unixpapa.com/incnote/byteorder.html */
 #ifndef BIG_ENDIAN