Index: firmware/App/Modes/ModeInitPOST.c
===================================================================
diff -u -r2e21405574597474db0ebae86cdd7fa2d517f71c -r7d4711edd7b40cd3e29f43e766f79a8a09586fe9
--- firmware/App/Modes/ModeInitPOST.c	(.../ModeInitPOST.c)	(revision 2e21405574597474db0ebae86cdd7fa2d517f71c)
+++ firmware/App/Modes/ModeInitPOST.c	(.../ModeInitPOST.c)	(revision 7d4711edd7b40cd3e29f43e766f79a8a09586fe9)
@@ -1,20 +1,23 @@
 /**************************************************************************
 *
-* Copyright (c) 2019-2022 Diality Inc. - All Rights Reserved.
+* Copyright (c) 2019-2024 Diality Inc. - All Rights Reserved.
 *
 * THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
 * WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
 *
 * @file    ModeInitPOST.c
 *
-* @author  (last)      Dara Navaei
-* @date    (last)      12-Aug-2022
+* @author  (last)      Michael Garthwaite
+* @date    (last)      16-May-2023
 *
 * @author  (original)  Dara Navaei
 * @date    (original)  05-Nov-2019
 *
 ***************************************************************************/
 
+#include "reg_crc.h"       // Used to hold reset reason code at startup before bits get cleared
+#include "reg_system.h"    // Used to access exception status registers for reset reason code at startup
+
 #include "Accel.h"
 #include "ConcentratePumps.h"
 #include "ConductivitySensors.h"
@@ -50,11 +53,11 @@
 
 // ********** private data **********
 
-static DG_POST_STATE_T postState = DG_POST_STATE_START;                                                     ///< Currently active initialize & POST state.
-static BOOL postCompleted = FALSE;                                                                          ///< Flag indicating POST completed.
-static BOOL postPassed = FALSE;                                                                             ///< Flag indicating all POST tests passed.
-static BOOL tempPOSTPassed = TRUE;                                                                          ///< Temporary flag indicating all POST tests completed so far have passed.
-static U32 startPOSTDelayCounter = 0;                                                                       ///< Start POST delay counter.
+static DG_POST_STATE_T postState;                                                                           ///< Currently active initialize & POST state.
+static BOOL postCompleted;                                                                                  ///< Flag indicating POST completed.
+static BOOL postPassed;                                                                                     ///< Flag indicating all POST tests passed.
+static BOOL tempPOSTPassed;                                                                                 ///< Temporary flag indicating all POST tests completed so far have passed.
+static U32 startPOSTDelayCounter;                                                                           ///< Start POST delay counter.
 
 // ********** private function prototypes **********
 
@@ -92,6 +95,14 @@
 {
     initInitAndPOSTMode();
     setCPLDCleanLEDColor( CPLD_CLEAN_LED_OFF );
+    setCurrentSubState( NO_SUB_STATE );
+    resetRTCPOSTState();
+    resetNVDataMgmtPOSTState();
+    resetAccelPOSTState();
+    resetPressuresPOSTState();
+    resetUVReactorsPOSTState();
+    resetWatchdogPOSTState();
+    resetSafetyShutdownPOSTState();
 
     return postState;
 }
@@ -259,6 +270,8 @@
             postCompleted = TRUE;
             // Broadcast final POST passed
             sendPOSTFinalResult( TRUE );
+            // Request whether we are in the RO only mode from UI
+            requestROOnlyModeStatusFromUI();
             // Go to standby mode
             requestNewOperationMode( DG_MODE_STAN );
             break;
@@ -332,8 +345,8 @@
 /*********************************************************************//**
  * @brief
  * The handlePOSTStateStart function handles the POST start state.
- * @details Inputs: startPOSTDelayCounter
- * @details Outputs: startPOSTDelayCounter
+ * @details Inputs: startPOSTDelayCounter, systemREG1
+ * @details Outputs: startPOSTDelayCounter, systemREG1
  * @return next POST state
  *************************************************************************/
 static DG_POST_STATE_T handlePOSTStateStart( void )
@@ -344,8 +357,13 @@
     // when the event data can be sent
     if ( ++startPOSTDelayCounter > START_POST_DELAY_COUNT )
     {
+        U32 resetReason = systemREG1->SYSESR | crcREG->PSA_SIGREGL1;                         // power-on reset bit preserved in an unused CRC register
+
+        systemREG1->SYSESR = systemREG1->SYSESR;                                             // clear reset bit(s) after logging event so subsequent resets can be properly identified as not being power-on resets.
+
         // Send the startup event
-        SEND_EVENT_WITH_2_U32_DATA( DG_EVENT_STARTUP, 0, 0 )
+        SEND_EVENT_WITH_2_U32_DATA( DG_EVENT_STARTUP, systemREG1->DEV, 0x12345678 )          // log startup event w/ device ID bits
+        SEND_EVENT_WITH_2_U32_DATA( DG_EVENT_STARTUP, resetReason, systemREG1->GBLSTAT )     // log startup event w/ reset reason(s) bits
         // Send the first submode change event. It is the mode Init and it does not start from a previous
         // mode previous and current are both published as Init
         SEND_EVENT_WITH_2_U32_DATA( DG_EVENT_OP_MODE_CHANGE, DG_MODE_INIT, DG_MODE_INIT )