Index: Utilities.c
===================================================================
diff -u -r7ff7e715f7a15da5f4055b33e186d58cf96fe909 -r7971a36491e30a84139068d7e00b416cf1ea3ee1
--- Utilities.c	(.../Utilities.c)	(revision 7ff7e715f7a15da5f4055b33e186d58cf96fe909)
+++ Utilities.c	(.../Utilities.c)	(revision 7971a36491e30a84139068d7e00b416cf1ea3ee1)
@@ -101,7 +101,7 @@
  * The crc16 function calculates a 16-bit CRC for a given range of bytes
  * in memory. Poly = 0x1021. Not reflected. Initial value = 0xFFFF.
  * @details
- * Inputs: none
+ * Inputs: crc16_table[]
  * Outputs: none
  * @param address pointer to start address of memory range to calculate CRC for
  * @param len number of bytes in the memory range to calculate CRC for
@@ -125,7 +125,7 @@
  * The crc8 function calculates a 8-bit CRC for a given range of bytes
  * in memory.
  * @details
- * Inputs: none
+ * Inputs: crc8_table[]
  * Outputs: none
  * @param address pointer to start address of memory range to calculate CRC for
  * @param len number of bytes in the memory range to calculate CRC for
@@ -142,6 +142,36 @@
     }
 
     return crc;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The crc8 function calculates the difference between two given unsigned
+ * 32-bit numbers.  If the second (ending) number is less than the first
+ * (starting) number, then the difference is calculated with a wrap past
+ * 32-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
+ *************************************************************************/
+U32 u32DiffWithWrap( U32 start, U32 end )
+{
+    U32 result;
+
+    // no wrap
+    if ( end >= start )
+    {
+        result = end - start;
+    }
+    // wrapped
+    else
+    {
+        result = ( 0xFFFFFFFF - start ) + end + 1;
+    }
+
+    return result;
 }
 
 /*********************************************************************//**