Index: Utilities.c
===================================================================
diff -u -rbe82a1c66a83e49efdf3ddbc288ae8560d678cc2 -r2932935752882cd7bc9808bfe238b03753d3e167
--- Utilities.c	(.../Utilities.c)	(revision be82a1c66a83e49efdf3ddbc288ae8560d678cc2)
+++ Utilities.c	(.../Utilities.c)	(revision 2932935752882cd7bc9808bfe238b03753d3e167)
@@ -176,6 +176,55 @@
     return result;
 }
 
+/*********************************************************************//**
+ * @brief
+ * The u16DiffWithWrap function calculates the difference between two given
+ * unsigned 16-bit numbers.  If the second (ending) number is less than the
+ * first (starting) number, then the difference is calculated with a wrap past
+ * 16-bit full scale to zero.
+ * @details Inputs: none
+ * @details Outputs: none
+ * @param start first number to compute difference for
+ * @param end second number to compute difference for
+ * @return the difference between the two given numbers
+ *************************************************************************/
+U16 u16DiffWithWrap( U16 start, U16 end )
+{
+    U16 result = ( end >= start ? end - start : ( HEX_64_K - start ) + end );
+
+    return result;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The u16BiDiffWithWrap function calculates the difference between two given
+ * unsigned 16-bit numbers.  This version of function returns a signed value
+ * to allow for a negative difference.
+ * @details Inputs: none
+ * @details Outputs: none
+ * @param start first number to compute difference for
+ * @param end second number to compute difference for
+ * @return the difference between the two given numbers
+ *************************************************************************/
+S16 u16BiDiffWithWrap( U16 start, U16 end )
+{
+    S16 result;
+
+    U16 incDelta = ( end >= start ? end - start : ( HEX_64_K - start ) + end );
+    U16 decDelta = HEX_64_K - incDelta;
+
+    if ( incDelta < decDelta )
+    {
+        result = (S16)incDelta;
+    }
+    else
+    {
+        result = (S16)decDelta * -1;
+    }
+
+    return result;
+}
+
 /*********************************************************************//**
  * @brief
  * The initTimeWindowedCount function initializes a given time windowed count.
Index: Utilities.h
===================================================================
diff -u -r7c49409b1bfeee8fd788fe1cd2a6dbf2abda7fea -r2932935752882cd7bc9808bfe238b03753d3e167
--- Utilities.h	(.../Utilities.h)	(revision 7c49409b1bfeee8fd788fe1cd2a6dbf2abda7fea)
+++ Utilities.h	(.../Utilities.h)	(revision 2932935752882cd7bc9808bfe238b03753d3e167)
@@ -84,7 +84,9 @@
 
 U16 crc16( const U08 *address, U32 len );
 U08 crc8( const U08 *address, U32 len );
-U32 u32DiffWithWrap( U32 start, U32 end );
+U32 u32DiffWithWrap( U32 start, U32 end );
+U16 u16DiffWithWrap( U16 start, U16 end );
+S16 u16BiDiffWithWrap( U16 start, U16 end );
 void initTimeWindowedCount( TIME_WINDOWED_COUNT_T cnt, U32 maxCnt, U32 winMs );
 BOOL incTimeWindowedCount( TIME_WINDOWED_COUNT_T cnt );
 CRITICAL_DATAS_T getCriticalData( CRITICAL_DATA_T *data );