Index: firmware/App/Drivers/GPIO.c
===================================================================
diff -u -r380b0afc95467d0861ff3aa2cdcde5d5d7ac85e7 -r395522dffef1348e176564925656012f529c1910
--- firmware/App/Drivers/GPIO.c	(.../GPIO.c)	(revision 380b0afc95467d0861ff3aa2cdcde5d5d7ac85e7)
+++ firmware/App/Drivers/GPIO.c	(.../GPIO.c)	(revision 395522dffef1348e176564925656012f529c1910)
@@ -1,22 +1,23 @@
 /**************************************************************************
 *
-* Copyright (c) 2024-2024 Diality Inc. - All Rights Reserved.
+* Copyright (c) 2024-2026 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    GPIO.c
 *
-* @author  (last)      Sean
-* @date    (last)      07-Aug-2024
+* @author  (last)      Sean Nash
+* @date    (last)      24-Jan-2025
 *
-* @author  (original)  Sean
+* @author  (original)  Sean Nash
 * @date    (original)  07-Aug-2024
 *
 ***************************************************************************/
 
 #include "gio.h"
 #include "mibspi.h"
+#include "reg_het.h"
 
 #include "GPIO.h"
 
@@ -40,21 +41,24 @@
 #define SAFETY_POST_NO_24V_RESTORE          2                           ///< Safety shutdown POST failed because 24V was not restored when safety line reset.
 
 // GIO port A pin assignments for pins connected to CPLD
-#define OFF_BUTTON_GIO_PORT_PIN     0U                                  ///< GPIO pin ID on port A for off button input signal.
-#define STOP_BUTTON_GIO_PORT_PIN    1U                                  ///< GPIO pin ID on port A for stop button input signal.
-#define SAFETY_GIO_PORT_PIN         3U                                  ///< GPIO pin ID on port A for safety shutdown output signal
+#define OFF_BUTTON_GIO_PORT_PIN             0U                          ///< GPIO pin ID on port A for off button input signal.
+#define STOP_BUTTON_GIO_PORT_PIN            1U                          ///< GPIO pin ID on port A for stop button input signal.
 
 // GIO port B pin assignments for pins connected to CPLD
-#define OFF_REQUEST_GIO_PORT_PIN    0U                                  ///< GPIO pin ID on port B for power off request output signal.
-#define WD_PET_GIO_PORT_PIN         1U                                  ///< GPIO pin ID on port B for watchdog pet output signal.
-#define SAFE_GIO_PORT_PIN           2U                                  ///< GPIO pin ID on port B for safety shutdown input signal.
+#define OFF_REQUEST_GIO_PORT_PIN            0U                          ///< GPIO pin ID on port B for power off request output signal.
+#define WD_PET_GIO_PORT_PIN                 1U                          ///< GPIO pin ID on port B for watchdog pet output signal.
+#define SAFE_GIO_PORT_PIN                   2U                          ///< GPIO pin ID on port B for safety shutdown input signal.
+#define SAFETY_GIO_PORT_PIN                 3U                          ///< GPIO pin ID on port B for safety shutdown output signal
 
 // MIBSPI5 port pin assignments for pins connected to CPLD
-#define GREEN_SPI5_PORT_MASK        0x00000200                          ///< (CLK     - re-purposed as output GPIO) for green alarm lamp signal.
-#define BLUE_SPI5_PORT_MASK         0x00000400                          ///< (SIMO[0] - re-purposed as output GPIO) for blue alarm lamp signal.
-#define RED_SPI5_PORT_MASK          0x00000800                          ///< (SOMI[0] - re-purposed as output GPIO) for red alarm lamp signal.
-#define AC_PRESENT_SPI5_PORT_MASK   0x00000001                          ///< (SOMI[0] - re-purposed as output GPIO) for red alarm lamp signal.
+#define GREEN_SPI5_PORT_MASK                0x00000200                  ///< (CLK     - re-purposed as output GPIO) for green alarm lamp signal.
+#define BLUE_SPI5_PORT_MASK                 0x00000400                  ///< (SIMO[0] - re-purposed as output GPIO) for blue alarm lamp signal.
+#define RED_SPI5_PORT_MASK                  0x00000800                  ///< (SOMI[0] - re-purposed as output GPIO) for red alarm lamp signal.
+#define AC_PRESENT_SPI5_PORT_MASK           0x00000001                  ///< (NCS[0]  - re-purposed as output GPIO) for AC present signal.
 
+// MIBSPI3 port pin assignments for pins connected to CPLD
+#define BACKUP_AUDIO_ENABLE_SPI3_PORT_MASK  0x00000001                  ///< (NCS[0]  - re-purposed as output GPIO for backup alarm audio enable.
+
 // CPLD pin I/O macros
 #define GET_OFF()          (PIN_SIGNAL_STATE_T)(gioGetBit(gioPORTA, OFF_BUTTON_GIO_PORT_PIN))   ///< Macro to get off button signal state.
 #define GET_STOP()         (PIN_SIGNAL_STATE_T)(gioGetBit(gioPORTA, STOP_BUTTON_GIO_PORT_PIN))  ///< Macro to get stop button signal state.
@@ -80,7 +84,6 @@
 #define CLR_SAFETY_SHUTDOWN()  gioSetBit( gioPORTB, SAFETY_GIO_PORT_PIN, PIN_SIGNAL_LOW )       ///< Macro to set safety shutdown signal state low.
 
 // Backup alarm audio enable/disable macros
-#define BACKUP_AUDIO_ENABLE_SPI3_PORT_MASK    0x00000001                                                ///< Pin SPI3-CS0 - re-purposed as output GPIO for backup alarm audio enable.
 #define SET_BACKUP_AUDIO_ENABLE()             {mibspiREG3->PC3 |= BACKUP_AUDIO_ENABLE_SPI3_PORT_MASK;}  ///< Macro to enable backup alarm audio.
 #define CLR_BACKUP_AUDIO_ENABLE()             {mibspiREG3->PC3 &= ~BACKUP_AUDIO_ENABLE_SPI3_PORT_MASK;} ///< Macro to disable backup alarm audio.