diff --git a/bacnet-stack/bacdcode.c b/bacnet-stack/bacdcode.c
index 8a8f5fe4..0a1800f3 100644
--- a/bacnet-stack/bacdcode.c
+++ b/bacnet-stack/bacdcode.c
@@ -36,7 +36,7 @@
 
 #include "bacdcode.h"
 #include "bits.h"
-#include "bigendian.h"
+#include "bigend.h"
 
 #ifndef MAX_APDU
 #define MAX_APDU 480
diff --git a/bacnet-stack/bigend.c b/bacnet-stack/bigend.c
new file mode 100644
index 00000000..60ca897d
--- /dev/null
+++ b/bacnet-stack/bigend.c
@@ -0,0 +1,27 @@
+// Big-Endian systems save the most significant byte first. 
+// Sun and Motorola processors, IBM-370s and PDP-10s are big-endian.
+// for example, a 4 byte integer 67305985 is 0x04030201 in hexidecimal.
+// x[0] = 0x04
+// x[1] = 0x03
+// x[2] = 0x02
+// x[3] = 0x01
+
+// Little-Endian systems save the least significant byte first. 
+// The entire Intel x86 family, Vaxes, Alphas and PDP-11s are little-endian.
+// for example, a 4 byte integer 67305985 is 0x04030201 in hexidecimal.
+// x[0] = 0x01
+// x[1] = 0x02
+// x[2] = 0x03
+// x[3] = 0x04
+
+int big_endian(void)
+{
+    union {
+        long l;
+        char c[sizeof(long)];
+    } u;
+
+    u.l = 1;
+
+    return (u.c[sizeof(long) - 1] == 1);
+}
diff --git a/bacnet-stack/bigend.h b/bacnet-stack/bigend.h
new file mode 100644
index 00000000..dc3a67f5
--- /dev/null
+++ b/bacnet-stack/bigend.h
@@ -0,0 +1,22 @@
+#ifndef BIGEND_H
+#define BIGEND_H
+
+// Big-Endian systems save the most significant byte first. 
+// Sun and Motorola processors, IBM-370s and PDP-10s are big-endian.
+// for example, a 4 byte integer 67305985 is 0x04030201 in hexidecimal.
+// x[0] = 0x04
+// x[1] = 0x03
+// x[2] = 0x02
+// x[3] = 0x01
+
+// Little-Endian systems save the least significant byte first. 
+// The entire Intel x86 family, Vaxes, Alphas and PDP-11s are little-endian.
+// for example, a 4 byte integer 67305985 is 0x04030201 in hexidecimal.
+// x[0] = 0x01
+// x[1] = 0x02
+// x[2] = 0x03
+// x[3] = 0x04
+
+int big_endian(void);
+
+#endif
diff --git a/bacnet-stack/bits.h b/bacnet-stack/bits.h
new file mode 100644
index 00000000..55671e17
--- /dev/null
+++ b/bacnet-stack/bits.h
@@ -0,0 +1,73 @@
+/*####COPYRIGHTBEGIN####
+ -------------------------------------------
+ Copyright (C) 2004 Steve Karg
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License
+ as published by the Free Software Foundation; either version 2
+ of the License, or (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to 
+ The Free Software Foundation, Inc.
+ 59 Temple Place - Suite 330 
+ Boston, MA  02111-1307, USA.
+
+ As a special exception, if other files instantiate templates or
+ use macros or inline functions from this file, or you compile
+ this file and link it with other works to produce a work based
+ on this file, this file does not by itself cause the resulting
+ work to be covered by the GNU General Public License. However
+ the source code for this file must still be made available in
+ accordance with section (3) of the GNU General Public License.
+
+ This exception does not invalidate any other reasons why a work
+ based on this file might be covered by the GNU General Public
+ License.
+ -------------------------------------------
+####COPYRIGHTEND####*/
+#ifndef BITS_H
+#define BITS_H
+
+/********************************************************************
+* Bit Masks
+*********************************************************************/
+#define BIT0            (0x01)
+#define BIT1            (0x02)
+#define BIT2            (0x04)
+#define BIT3            (0x08)
+#define BIT4            (0x10)
+#define BIT5            (0x20)
+#define BIT6            (0x40)
+#define BIT7            (0x80)
+#define BIT8          (0x0100)
+#define BIT9          (0x0200)
+#define BIT10         (0x0400)
+#define BIT11         (0x0800)
+#define BIT12         (0x1000)
+#define BIT13         (0x2000)
+#define BIT14         (0x4000)
+#define BIT15         (0x8000)
+#define BIT16       (0x010000UL)
+#define BIT17       (0x020000UL)
+#define BIT18       (0x040000UL)
+#define BIT19       (0x080000UL)
+#define BIT20       (0x100000UL)
+#define BIT21       (0x200000UL)
+#define BIT22       (0x400000UL)
+#define BIT23       (0x800000UL)
+#define BIT24     (0x01000000UL)
+#define BIT25     (0x02000000UL)
+#define BIT26     (0x04000000UL)
+#define BIT27     (0x08000000UL)
+#define BIT28     (0x10000000UL)
+#define BIT29     (0x20000000UL)
+#define BIT30     (0x40000000UL)
+#define BIT31     (0x80000000UL)
+
+#endif