Index: firmware/App/Drivers/GPIO.c
===================================================================
diff -u -r772fdd144e4006fada12a2e91519378b29d54bae -r055108714c39391276fc1ae1f404237627306b92
--- firmware/App/Drivers/GPIO.c	(.../GPIO.c)	(revision 772fdd144e4006fada12a2e91519378b29d54bae)
+++ firmware/App/Drivers/GPIO.c	(.../GPIO.c)	(revision 055108714c39391276fc1ae1f404237627306b92)
@@ -39,16 +39,6 @@
 #define SAFETY_POST_24V_NOT_CUT             1                           ///< Safety shutdown POST failed because 24V was not cut when safety line pulled.
 #define SAFETY_POST_NO_24V_RESTORE          2                           ///< Safety shutdown POST failed because 24V was not restored when safety line reset.
 
-/// Enumeration of safety shutdown self-test states.
-typedef enum Safety_Shutdown_Self_Test_States
-{
-    SAFETY_SHUTDOWN_SELF_TEST_STATE_START = 0,                          ///< Safety shutdown self-test start state
-    SAFETY_SHUTDOWN_SELF_TEST_STATE_IN_PROGRESS,                        ///< Safety shutdown self-test in progress state
-    SAFETY_SHUTDOWN_SELF_TEST_STATE_RECOVER,                            ///< Safety shutdown self-test recovery state
-    SAFETY_SHUTDOWN_SELF_TEST_STATE_COMPLETE,                           ///< Safety shutdown self-test completed state
-    NUM_OF_SAFETY_SHUTDOWN_SELF_TEST_STATES                             ///< Number of safety shutdown self-test states
-} SAFETY_SHUTDOWN_SELF_TEST_STATE_T;
-
 // 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.