diff --git a/fsw_params.h b/fsw_params.h
--- a/fsw_params.h
+++ b/fsw_params.h
@@ -9,6 +9,16 @@
 #define GRSPW_DEVICE_NAME "/dev/grspw0"
 #define UART_DEVICE_NAME "/dev/console"
 
+enum lfr_transition_type_t{
+    TRANSITION_NOT_SPECIFIC,
+    TRANSITION_NORM_TO_S1,
+    TRANSITION_NORM_TO_S2,
+    TRANSITION_S1_TO_NORM,
+    TRANSITION_S2_TO_NORM,
+    TRANSITION_S1_TO_S2,
+    TRANSITION_S2_TO_S1
+};
+
 typedef struct ring_node
 {
     struct ring_node *previous;