Index: firmware/App/Drivers/GPIO.c
===================================================================
diff -u
--- firmware/App/Drivers/GPIO.c	(revision 0)
+++ firmware/App/Drivers/GPIO.c	(revision 5d682ef4b973ca85e67ac00cc2610e2f6c378b0c)
@@ -0,0 +1,93 @@
+/**************************************************************************
+*
+* Copyright (c) 2024-2024 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    GPIO.c
+*
+* @author  (last)      Vinayakam Mani
+* @date    (last)      29-Aug-2024
+*
+* @author  (original)  Vinayakam Mani
+* @date    (original)  29-Aug-2024
+*
+***************************************************************************/
+
+#include "gio.h"
+#include "mibspi.h"
+
+#include "GPIO.h"
+
+/**
+ *  @addtogroup GPIO
+ *  @{
+ */
+
+// ********** private definitions **********
+
+#define WD_PET_GIO_PORT_PIN         1U                                                              ///< Watchdog pet GPIO pin number.
+#define WD_EXP_GIO_PORT_PIN         0U                                                              ///< Watchdog expired GPIO pin number.
+
+#define GET_WD_EXP()       ( PIN_SIGNAL_STATE_T )( gioGetBit( gioPORTB, WD_EXP_GIO_PORT_PIN ) )     ///< Get watchdog expired pin state macro.
+#define TGL_WD_PET()       gioToggleBit( gioPORTB, WD_PET_GIO_PORT_PIN )                            ///< Macro to toggle watchdog pet signal state.
+
+#define SET_WD_PET()       gioSetBit( gioPORTB, WD_PET_GIO_PORT_PIN, PIN_SIGNAL_HIGH )              ///< Macro to set watchdog pet signal state high.
+#define CLR_WD_PET()       gioSetBit( gioPORTB, WD_PET_GIO_PORT_PIN, PIN_SIGNAL_LOW )               ///< Macro to set watchdog pet signal state low.
+
+/*********************************************************************//**
+ * @brief
+ * The toggleWatchdogPetSignal function toggles the watchdog pet output
+ * signal on its GPIO pin.
+ * @details \b Inputs: none
+ * @details \b Outputs: Watchdog pet output signal toggled
+ * @return none
+ *************************************************************************/
+void toggleWatchdogPetSignal( void )
+{
+    TGL_WD_PET();
+}
+
+/*********************************************************************//**
+ * @brief
+ * The setWatchdogPetSignal function sets the watchdog pet output
+ * signal on its GPIO pin to HIGH.
+ * @details \b Inputs: none
+ * @details \b Outputs: Watchdog pet output signal set high
+ * @return none
+ *************************************************************************/
+void setWatchdogPetSignal( void )
+{
+    SET_WD_PET();
+}
+
+/*********************************************************************//**
+ * @brief
+ * The clrWatchdogPetSignal function sets the watchdog pet output
+ * signal on its GPIO pin to LOW.
+ * @details \b Inputs: none
+ * @details \b Outputs: Watchdog pet output signal set low
+ * @return none
+ *************************************************************************/
+void clrWatchdogPetSignal( void )
+{
+    CLR_WD_PET();
+}
+
+/*********************************************************************//**
+ * @brief
+ * The getWatchdogExpired function determines the current signal level
+ * on the watchdog expired pin from the CPLD.
+ * @details Inputs: Signal from CPLD on watchdog expired pin.
+ * @details Outputs: none
+ * @return level (LOW or HIGH)
+ *************************************************************************/
+PIN_SIGNAL_STATE_T getWatchdogExpired( void )
+{
+    PIN_SIGNAL_STATE_T level = GET_WD_EXP();
+
+    return level;
+}
+
+/**@}*/
Index: firmware/App/Drivers/GPIO.h
===================================================================
diff -u
--- firmware/App/Drivers/GPIO.h	(revision 0)
+++ firmware/App/Drivers/GPIO.h	(revision 5d682ef4b973ca85e67ac00cc2610e2f6c378b0c)
@@ -0,0 +1,41 @@
+/**************************************************************************
+*
+* Copyright (c) 2024-2024 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    GPIO.h
+*
+* @author  (last)      Vinayakam Mani
+* @date    (last)      29-Aug-2024
+*
+* @author  (original)  Sean
+* @date    (original)  29-Aug-2024
+*
+***************************************************************************/
+
+#ifndef __GPIO_H__
+#define __GPIO_H__
+
+#include "DDCommon.h"
+
+/**
+ *  @defgroup GPIO GPIO
+ *  @brief The GPIO unit provides definitions and GPIO pin access abstraction
+ *  functions to provide low-level GPIO interface.
+ *
+ *  @addtogroup GPIO
+ *  @{
+ */
+
+// ********** public function prototypes **********
+
+void toggleWatchdogPetSignal( void );
+void setWatchdogPetSignal( void );
+void clrWatchdogPetSignal( void );
+PIN_SIGNAL_STATE_T getCPLDWatchdogExpired( void );
+
+/**@}*/
+
+#endif
Index: firmware/App/Drivers/InternalADC.c
===================================================================
diff -u -r26ee1d67dca19aac1850077cbd41c05498cf059d -r5d682ef4b973ca85e67ac00cc2610e2f6c378b0c
--- firmware/App/Drivers/InternalADC.c	(.../InternalADC.c)	(revision 26ee1d67dca19aac1850077cbd41c05498cf059d)
+++ firmware/App/Drivers/InternalADC.c	(.../InternalADC.c)	(revision 5d682ef4b973ca85e67ac00cc2610e2f6c378b0c)
@@ -58,7 +58,8 @@
     INT_ADC_POWER_SUPPLY_1_THERMISTOR,    // 22
     INT_ADC_MAIN_NON_ISOLATED_24_VOLTS,   // 23
 };
-
+
+/// ADC channel read to units look-up table.
 const F32 ADC_CHANNEL_READ_TO_UNITS[ NUM_OF_INT_ADC_CHANNELS ] =
 {
     0.0,        //     - INT_ADC_NOT_USED
Index: firmware/App/Drivers/InternalADC.h
===================================================================
diff -u -r26ee1d67dca19aac1850077cbd41c05498cf059d -r5d682ef4b973ca85e67ac00cc2610e2f6c378b0c
--- firmware/App/Drivers/InternalADC.h	(.../InternalADC.h)	(revision 26ee1d67dca19aac1850077cbd41c05498cf059d)
+++ firmware/App/Drivers/InternalADC.h	(.../InternalADC.h)	(revision 5d682ef4b973ca85e67ac00cc2610e2f6c378b0c)
@@ -22,7 +22,9 @@
 
 /**
  *  @defgroup InternalADC InternalADC
- *  @brief DD internal ADC module.
+ *  @brief DD internal ADC module. This module converts all analog channel (DD
+ *  different voltage rails, pressure, temperature) into digital value for further
+ *  processing ( monitoring and controls).
  *
  *  @addtogroup InternalADC
  *  @{
Index: firmware/App/Drivers/PAL.c
===================================================================
diff -u -r26ee1d67dca19aac1850077cbd41c05498cf059d -r5d682ef4b973ca85e67ac00cc2610e2f6c378b0c
--- firmware/App/Drivers/PAL.c	(.../PAL.c)	(revision 26ee1d67dca19aac1850077cbd41c05498cf059d)
+++ firmware/App/Drivers/PAL.c	(.../PAL.c)	(revision 5d682ef4b973ca85e67ac00cc2610e2f6c378b0c)
@@ -7,13 +7,14 @@
 *
 * @file    PAL.c
 *
-* @author  (last)      Sean
+* @author  (last)      Vinayakam Mani
 * @date    (last)      07-Aug-2024
 *
-* @author  (original)  Sean
+* @author  (original)  Vinayakam Mani
 * @date    (original)  07-Aug-2024
 *
 ***************************************************************************/
+
 #include "mibspi.h"
 #include "reg_system.h"
 #include "reg_crc.h"
Index: firmware/App/Drivers/PAL.h
===================================================================
diff -u -r26ee1d67dca19aac1850077cbd41c05498cf059d -r5d682ef4b973ca85e67ac00cc2610e2f6c378b0c
--- firmware/App/Drivers/PAL.h	(.../PAL.h)	(revision 26ee1d67dca19aac1850077cbd41c05498cf059d)
+++ firmware/App/Drivers/PAL.h	(.../PAL.h)	(revision 5d682ef4b973ca85e67ac00cc2610e2f6c378b0c)
@@ -7,10 +7,10 @@
 *
 * @file    PAL.h
 *
-* @author  (last)      Sean
+* @author  (last)      Vinayakam Mani
 * @date    (last)      07-Aug-2024
 *
-* @author  (original)  Sean
+* @author  (original)  Vinayakam Mani
 * @date    (original)  07-Aug-2024
 *
 ***************************************************************************/