Index: firmware/App/Modes/ModePreGenDialysate.c
===================================================================
diff -u -r6d0bd19fb192dcd272fa773e8833862cc8a8f750 -r6d4aa77e6b85aa7621a234660f631e725fb1d441
--- firmware/App/Modes/ModePreGenDialysate.c	(.../ModePreGenDialysate.c)	(revision 6d0bd19fb192dcd272fa773e8833862cc8a8f750)
+++ firmware/App/Modes/ModePreGenDialysate.c	(.../ModePreGenDialysate.c)	(revision 6d4aa77e6b85aa7621a234660f631e725fb1d441)
@@ -7,8 +7,8 @@
 *
 * @file    ModePreGenDialysate.c
 *
-* @author  (last)      Arpita Srivastava
-* @date    (last)      10-Mar-2026
+* @author  (last)      Raghu Kallala
+* @date    (last)      22-Apr-2026
 *
 * @author  (original)  Vinayakam Mani
 * @date    (original)  18-Apr-2025
@@ -513,4 +513,67 @@
     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:
+                result = TRUE;
+                break;
+
+            default:
+                break;
+        }
+    }
+
+    return result;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The testSignalNewDDPreGenDialysateSubMode function request transition
+ * to a new operation sub mode.
+ * @details \b Inputs: none
+ * @details \b Outputs: preGenDialysateState
+ * @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?
+    }
+}
+
 /**@}*/