bugfix: fix frame type inference.

datalink814_ge/src/linklayer/linklayer814.c

@@ -40,6 +40,7 @@ static void L2_SetSlotNum(L2_INST *instPtr, uint32_t newSlotNum);
 static void L2_SetFrameNum(L2_INST *instPtr, uint32_t newFrameNum);
 static void L2_UpdateSlotNum(L2_INST *instPtr);
 static void L2_DataAvailUpdate(L2_INST *instPtr, bool status);
+static L2_FRAME_TYPE L2_GetReceiveFrameType(L2_INST *instPtr);
 
 /**
  * @brief	helper function to update linkelayer state
@@ -296,6 +297,34 @@ inline void L2_RcdShift(L2_RCD *rcd, int32_t netxVal)
 	rcd->next = netxVal;
 }
 
+/*****************************************************************************/
+/**
+ * @brief   Infer last received frame type.
+ *
+ * @param   instPtr  A pointer to physical layer control instance.
+ *
+ * @return  L2_FRAME_TYPE.
+ *
+ ******************************************************************************/
+static L2_FRAME_TYPE L2_GetReceiveFrameType(L2_INST *instPtr)
+{
+	if (instPtr->myInfo.nodeType == L2_NODE_HEAD || L2_isCxn2Net(instPtr))
+	{
+		return instPtr->frame.curr;
+	}
+
+	switch (instPtr->scanNetFSM->scanStage)
+	{
+	case L2_SCAN_INIT_STAGE:
+	case L2_SCAN_BMADVT_STAGE:
+		return L2_INTRA_BM_FRAME;
+	case L2_SCANT_2WAYACQ_STAGE:
+		return L2_INTRA_W2_ACQ_FRAME;
+	default:
+		return L2_NONE_FRAME;
+	}
+}
+
 /*****************************************************************************/
 /**
  * @brief   Update L2 frame state, check if there is any valid L2 frame data in
@@ -322,7 +351,7 @@ void L2_FrameStateUpdate(L2_INST *instPtr)
 	Phy_RetrieveRecvData(phyRef, instPtr->recvPktData);
 	instPtr->log.frameRecv++;
 
-	switch (instPtr->frame.last)
+	switch (L2_GetReceiveFrameType(instPtr))
 	{
 	case L2_INTRA_SCAN_FRAME:
 	// INTRA_BM_FRAME could be received if current frame type is INTRA_BM_FRAME