Index: firmware/App/Modes/ModePreGenDialysate.c
===================================================================
diff -u -rd210786d6c7d75bb0b4d9e18efc40a01d85123fe -r5db64c182f58f16d6b4b9a5131a2913b4a156ccc
--- firmware/App/Modes/ModePreGenDialysate.c	(.../ModePreGenDialysate.c)	(revision d210786d6c7d75bb0b4d9e18efc40a01d85123fe)
+++ firmware/App/Modes/ModePreGenDialysate.c	(.../ModePreGenDialysate.c)	(revision 5db64c182f58f16d6b4b9a5131a2913b4a156ccc)
@@ -510,4 +510,65 @@
     return result;
 }
 
+/*********************************************************************//**
+ * @brief
+ * The testValidateDDPreGenDialysateChangeReq function validate whether request
+ * operation sub mode is legal or not.
+ * @details \b Inputs: none
+ * @details \b Outputs: none
+ * @param newSubMode the enumerated sub state of the mode
+ * @return TRUE if request is legal, FALSE if not
+ *************************************************************************/
+BOOL testValidateDDPreGenDialysateChangeReq( U32 newSubMode )
+{
+    BOOL result = FALSE;
+
+    if ( newSubMode < NUM_OF_DD_PRE_GEN_DIALYSATE_STATES )
+    {
+        switch ( newSubMode )
+        {
+            // TODO add validate condition after checking with Vinay
+            case DD_PRE_GEN_DIALYSATE_HYD_CHAMBER_FILL_CHECK:
+            case DD_PRE_GEN_WET_SELF_TEST:
+            case DD_PRE_GEN_DRY_BICART_INITIAL_FILL:
+            case DD_PRE_GEN_DIALYSATE_WAIT_FOR_GEND:
+            default:
+                result = TRUE;
+                break;
+        }
+    }
+
+    return result;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The testSignalNewDDPreGenDialysateSubMode function request transition
+ * to a new operation sub mode.
+ * @details \b Inputs: none
+ * @details \b Outputs: none
+ * @param newSubMode the enumerated sub state of the mode
+ * @return none
+ *************************************************************************/
+void testSignalNewDDPreGenDialysateSubMode( U32 newSubMode )
+{
+    if ( newSubMode < NUM_OF_DD_PRE_GEN_DIALYSATE_STATES )
+    {
+        preGenDialysateState = (DD_PRE_GEN_DIALYSATE_STATE_T)newSubMode;
+
+        switch ( newSubMode )
+        {
+            // TODO add logic after checking with Vinay
+            // Any of these state require no special handling
+            case DD_PRE_GEN_DIALYSATE_HYD_CHAMBER_FILL_CHECK:
+            case DD_PRE_GEN_WET_SELF_TEST:
+            case DD_PRE_GEN_DRY_BICART_INITIAL_FILL:
+            case DD_PRE_GEN_DIALYSATE_WAIT_FOR_GEND:
+            default:
+                break;
+        }
+        // TODO should setState handled separately for wet self state?
+    }
+}
+
 /**@}*/