diff --git a/df_datalink_sp/src/networking/link_layer/link_layer.c b/df_datalink_sp/src/networking/link_layer/link_layer.c
index fcab981..0267ebb 100644
--- a/df_datalink_sp/src/networking/link_layer/link_layer.c
+++ b/df_datalink_sp/src/networking/link_layer/link_layer.c
@@ -147,6 +147,15 @@ inline L2_NODE_STATE L2_GetMainState(L2_INST *instPtr)
 	return instPtr->mainState;
 }
 
+/**
+ * @brief   Check if there is a valid l2 frame.
+ */
+inline bool L2_isStarted(L2_INST *instPtr)
+{
+	ASSERT(instPtr != NULL);
+	return instPtr->isEnable;
+}
+
 /**
  * @brief   Check if there is a valid l2 frame.
  */
diff --git a/df_datalink_sp/src/networking/link_layer/link_layer.h b/df_datalink_sp/src/networking/link_layer/link_layer.h
index 316bd7d..ec0698c 100644
--- a/df_datalink_sp/src/networking/link_layer/link_layer.h
+++ b/df_datalink_sp/src/networking/link_layer/link_layer.h
@@ -155,6 +155,7 @@ uint8_t L2_GetClusterId(L2_INST *instPtr);
 uint8_t L2_GetHeadId(L2_INST *instPtr);
 L2_NODE_TYPE L2_GetNodeType(L2_INST *instPtr);
 L2_NODE_STATE L2_GetMainState(L2_INST *instPtr);
+bool L2_isStarted(L2_INST *instPtr);
 bool L2_isDataAvail(L2_INST *instPtr);
 bool L2_isCxn2Net(L2_INST *instPtr);
 uint32_t L2_GetFrameLen(L2_FRAME_TYPE l2FrameType);