Index: source/sys_main.c
===================================================================
diff -u -rcb47c5f896477ceae7597cb1a4191b3972e93f0d -r38ff7a6fbf82b86ab1bac3b7b24c4ea33d5419f9
--- source/sys_main.c	(.../sys_main.c)	(revision cb47c5f896477ceae7597cb1a4191b3972e93f0d)
+++ source/sys_main.c	(.../sys_main.c)	(revision 38ff7a6fbf82b86ab1bac3b7b24c4ea33d5419f9)
@@ -127,6 +127,8 @@
     canInit();      // CAN1 = CAN, re-purposing CAN2 and CAN3 Rx and Tx pins as GPIO
     sciInit();      // SCI1 used for PC serial interface, SCI2 used for FPGA serial interface
     dmaEnable();    // enable DMA
+//    sciEnableLoopback( sciREG, Digital_Lbk );  // TODO - for test only
+//    sciEnableLoopback( scilinREG, Digital_Lbk );  // TODO - for test only
 }
 
 /*************************************************************************
@@ -184,58 +186,4 @@
     _enable_IRQ();
 }
 
-void sciNotification(sciBASE_t *sci, uint32 flags)
-{
-    static U32 fErrorCnt = 0;
-    static U32 oErrorCnt = 0;
-
-    if ( ( flags & SCI_FE_INT ) != 0 )
-    {
-        fErrorCnt++;
-    }
-    if ( ( flags & SCI_OE_INT ) != 0 )
-    {
-        oErrorCnt++;
-    }
-}
-
-void dmaGroupANotification(dmaInterrupt_t inttype, uint32 channel)
-{
-    if ( inttype == BTC )
-    {
-        switch ( channel )
-        {
-            case DMA_CH0:
-                // clear DMA receipt
-                scilinREG->CLEARINT = (uint32)((uint32)1U << 17U);  /* Rx DMA */
-                scilinREG->CLEARINT = (uint32)((uint32)1U << 18U);  /* Rx DMA All */
-                break;
-
-            case DMA_CH1:
-                // clear DMA receipt
-                sciREG->CLEARINT = (uint32)((uint32)1U << 17U);  /* Rx DMA */
-                sciREG->CLEARINT = (uint32)((uint32)1U << 18U);  /* Rx DMA All */
-                // handle received packet from PC
-                handleUARTMsgRecvPacketInterrupt();
-                break;
-
-            case DMA_CH2:
-                // clear DMA xmit
-                scilinREG->CLEARINT = (uint32)((uint32)1U << 16U);  /* Tx DMA */
-                break;
-
-            case DMA_CH3:
-                // clear DMA xmit
-                sciREG->CLEARINT = (uint32)((uint32)1U << 16U);  /* Tx DMA */
-                // send next pending packet to PC (if any)
-                handleUARTMsgXmitPacketInterrupt();
-                break;
-
-            default:
-                // TODO - ignore?
-                break;
-        }
-    }
-}
-
 /* USER CODE END */