Index: Utilities.c
===================================================================
diff -u -r66600859e4fb3036f48901aae8c9845f37e3e707 -r5846ff450c26de04b388c2636964a9116ccb6e9d
--- Utilities.c	(.../Utilities.c)	(revision 66600859e4fb3036f48901aae8c9845f37e3e707)
+++ Utilities.c	(.../Utilities.c)	(revision 5846ff450c26de04b388c2636964a9116ccb6e9d)
@@ -207,6 +207,41 @@
     return crc;
 }
 
+U08 crc4( U08* buffer )
+{
+    U32 count;
+    U08 nBit;
+    U32 nRem = 0;
+
+    for ( count = 0; count < 16; count++ )
+    {
+        if ( 1 == ( count % 2 ) )
+        {
+            nRem ^= (U16)( buffer[ count >> 1 ] & MASK_OFF_MSB );
+        }
+        else
+        {
+            nRem ^= (U16)( buffer[ count >> 1 ] >> SHIFT_8_BITS_FOR_BYTE_SHIFT );
+        }
+
+        for ( nBit = SHIFT_8_BITS_FOR_BYTE_SHIFT; nBit > 0; nBit-- )
+        {
+            if ( nRem & 0x8000 )
+            {
+                nRem = ( nRem << 1 ) ^ 0x3000;
+            }
+            else
+            {
+                nRem = ( nRem << 1 );
+            }
+        }
+    }
+
+    nRem = ( 0x000F & ( nRem >> 12 ) );
+
+    return ( nRem ^ 0x00 );
+}
+
 /*********************************************************************//**
  * @brief
  * The u32DiffWithWrap function calculates the difference between two given
Index: Utilities.h
===================================================================
diff -u -r4f4de3faf2468a13710bace8f2c7174d59396f4a -r5846ff450c26de04b388c2636964a9116ccb6e9d
--- Utilities.h	(.../Utilities.h)	(revision 4f4de3faf2468a13710bace8f2c7174d59396f4a)
+++ Utilities.h	(.../Utilities.h)	(revision 5846ff450c26de04b388c2636964a9116ccb6e9d)
@@ -87,6 +87,7 @@
 U32 crc32( U32 const initialValue, const U08 *address, U32 len );
 U16 crc16( const U08 *address, U32 len );
 U08 crc8( const U08 *address, U32 len );
+U08 crc4( U08* buffer );
 U32 u32DiffWithWrap( U32 start, U32 end );
 S32 u32BiDiffWithWrap( U32 start, U32 end );
 U16 u16DiffWithWrap( U16 start, U16 end );