Index: firmware/App/Drivers/PAL.c
===================================================================
diff -u -r6ce9326aeabf018e9c531163359f7283f9d60ae9 -r090cfb22a7c0b4738299c3fb411ca77aaba8d968
--- firmware/App/Drivers/PAL.c	(.../PAL.c)	(revision 6ce9326aeabf018e9c531163359f7283f9d60ae9)
+++ firmware/App/Drivers/PAL.c	(.../PAL.c)	(revision 090cfb22a7c0b4738299c3fb411ca77aaba8d968)
@@ -14,7 +14,7 @@
 * @date    (original)  07-Aug-2024
 *
 ***************************************************************************/
-
+#include "mibspi.h"
 #include "reg_system.h"
 #include "reg_crc.h"
 
@@ -25,13 +25,17 @@
  *  @{
  */
 
-// ********** private definitions **********
+// ********** private definitions **********
+#define SAFETY_SPI1_PORT_MASK       0x00000010                                      ///< Safety shutdown GPIO port mask (CS[4] - re-purposed as output GPIO).
+#define SET_SAFETY_SHUTDOWN()       {mibspiREG1->PC3 |= SAFETY_SPI1_PORT_MASK;}     ///< Set safety shutdown GPIO macro.
+#define CLR_SAFETY_SHUTDOWN()       {mibspiREG1->PC3 &= ~SAFETY_SPI1_PORT_MASK;}    ///< Clear safety shutdown GPIO macro.
 
+
 /*********************************************************************//**
  * @brief
  * The setSystemREG1_SYSECR function sets the SYSECR register to a given value.
- * @details Inputs: none
- * @details Outputs: SYSECR register set to given value
+ * @details \b Inputs: none
+ * @details \b Outputs: SYSECR register set to given value
  * @return none
  *************************************************************************/
 void setSystemREG1_SYSECR( U32 regval )
@@ -42,8 +46,8 @@
 /*********************************************************************//**
  * @brief
  * The getSystemREG1_SYSECR function gets the current value of the SYSECR register.
- * @details Inputs: SYSECR register
- * @details Outputs: none
+ * @details \b Inputs: SYSECR register
+ * @details \b Outputs: none
  * @return Value of the SYSECR register
  *************************************************************************/
 U32 getSystemREG1_SYSECR( void )
@@ -55,8 +59,8 @@
  * @brief
  * The setCrcREG_PSA_SIGREGL1 function sets the CRC PSA_SIGREGL1 register
  * to a given value.
- * @details Inputs: none
- * @details Outputs: PSA_SIGREGL1 register set to given value
+ * @details \b Inputs: none
+ * @details \b Outputs: PSA_SIGREGL1 register set to given value
  * @return none
  *************************************************************************/
 void setCrcREG_PSA_SIGREGL1( U32 regval )
@@ -68,13 +72,37 @@
  * @brief
  * The getCrcREG_PSA_SIGREGL1 function gets the current value of the CRC
  * PSA_SIGREGL1 register.
- * @details Inputs: PSA_SIGREGL1 register
- * @details Outputs: none
+ * @details \b Inputs: PSA_SIGREGL1 register
+ * @details \b Outputs: none
  * @return Value of the PSA_SIGREGL1 register
  *************************************************************************/
 U32 getCrcREG_PSA_SIGREGL1( void )
 {
     return crcREG->PSA_SIGREGL1;
 }
 
+/*********************************************************************//**
+ * @brief
+ * The set_saftey_shutdown function sets the GPIO to disable 24v supply.
+ * @details \b Inputs: none
+ * @details \b Outputs: mibspiREG1->PC3
+ * @return Value none
+ *************************************************************************/
+void set_safety_shutdown( void )
+{
+    SET_SAFETY_SHUTDOWN();
+}
+
+/*********************************************************************//**
+ * @brief
+ * The clear_saftety_shutdown function clears the GPIO to enable 24v supply.
+ * @details \b Inputs: none
+ * @details \b Outputs: mibspiREG1->PC3
+ * @return Value none
+ *************************************************************************/
+void clear_saftety_shutdown( void )
+{
+    CLR_SAFETY_SHUTDOWN();
+}
+
 /**@}*/