Index: App/Services/MsgQueues.c
===================================================================
diff -u -r24f2fc89f0bfb62edcae316511e3fb4d7a336d01 -r7d70e839bc71f6fc37da8cd12eecb374841882df
--- App/Services/MsgQueues.c	(.../MsgQueues.c)	(revision 24f2fc89f0bfb62edcae316511e3fb4d7a336d01)
+++ App/Services/MsgQueues.c	(.../MsgQueues.c)	(revision 7d70e839bc71f6fc37da8cd12eecb374841882df)
@@ -30,8 +30,6 @@
 
 // ********** private function prototypes **********
 
-static void blankMessageInWrapper( MESSAGE_WRAPPER_T *message );
-
 /*************************************************************************
  * @brief initMsgQueues
  * The initMsgQueues function initializes the MsgQueues module.
@@ -69,11 +67,7 @@
  * @param msg : a pointer to a message structure to add to the queue
  * @return TRUE if message added to queue, FALSE if could not
  *************************************************************************/
-//static U32 msgQueueCounts[NUM_OF_MSG_QUEUES];
-//static U32 msgQueueStarts[NUM_OF_MSG_QUEUES];
-//static U32 msgQueueNexts[NUM_OF_MSG_QUEUES];
-//static MESSAGE_WRAPPER_T msgQueues[NUM_OF_MSG_QUEUES][MAX_MSG_QUEUE_SIZE];
-BOOL addToMsgQueue( MSG_QUEUE_T queue, MESSAGE_T *msg )
+BOOL addToMsgQueue( MSG_QUEUE_T queue, MESSAGE_WRAPPER_T *msg )
 {
     BOOL result = FALSE;
 
@@ -107,7 +101,7 @@
         if ( FALSE == full )
         {
             // add message to queue
-            msgQueues[queue][next].msg = *msg;
+            msgQueues[queue][next] = *msg;
 
             // TODO - calculate CRC for given message (just zero for now)
             msgQueues[queue][next].crc = 0x0;
@@ -171,6 +165,8 @@
         {
             // get message from queue
             *msg = msgQueues[queue][first];
+
+            result = TRUE;
         }
         else // message queue is full
         {
@@ -249,10 +245,10 @@
  * @details
  * Inputs : none
  * Outputs : none
- * @param message : the message in a wrapper to blank.
+ * @param message : Pointer to the message in a wrapper to blank.
  * @return none
  *************************************************************************/
-static void blankMessageInWrapper( MESSAGE_WRAPPER_T *message )
+void blankMessageInWrapper( MESSAGE_WRAPPER_T *message )
 {
     U32 i;
     U32 msgSize = sizeof(MESSAGE_WRAPPER_T);
@@ -267,3 +263,5 @@
     message->msg.hdr.msgID = 0xFFFF;
 }
 
+
+
Index: App/Services/MsgQueues.h
===================================================================
diff -u -r24f2fc89f0bfb62edcae316511e3fb4d7a336d01 -r7d70e839bc71f6fc37da8cd12eecb374841882df
--- App/Services/MsgQueues.h	(.../MsgQueues.h)	(revision 24f2fc89f0bfb62edcae316511e3fb4d7a336d01)
+++ App/Services/MsgQueues.h	(.../MsgQueues.h)	(revision 7d70e839bc71f6fc37da8cd12eecb374841882df)
@@ -58,12 +58,15 @@
     U08              crc;                       // message CRC
 } MESSAGE_WRAPPER_T;
 
+#define MESSAGE_OVERHEAD_SIZE   (sizeof(MESSAGE_HEADER_T) + sizeof(U08))
+
 // ********** public function prototypes **********
 
 void initMsgQueues( void );
-BOOL addToMsgQueue( MSG_QUEUE_T queue, MESSAGE_T *msg );
+BOOL addToMsgQueue( MSG_QUEUE_T queue, MESSAGE_WRAPPER_T *msg );
 BOOL getFromMsgQueue( MSG_QUEUE_T queue, MESSAGE_WRAPPER_T *msg );
 BOOL isMsgQueueEmpty( MSG_QUEUE_T queue );
 BOOL isMsgQueueFull( MSG_QUEUE_T queue );
+void blankMessageInWrapper( MESSAGE_WRAPPER_T *message );
 
 #endif
Index: App/Services/SystemComm.c
===================================================================
diff -u -ree310a2e5262c05bf0dc0eb0d84da0ee50bac7fe -r7d70e839bc71f6fc37da8cd12eecb374841882df
--- App/Services/SystemComm.c	(.../SystemComm.c)	(revision ee310a2e5262c05bf0dc0eb0d84da0ee50bac7fe)
+++ App/Services/SystemComm.c	(.../SystemComm.c)	(revision 7d70e839bc71f6fc37da8cd12eecb374841882df)
@@ -16,14 +16,29 @@
  *
  **************************************************************************/
 
+#include "can.h"
+
 #include "Common.h"
+#include "Buttons.h"
+#include "CommBuffers.h"
+#include "MsgQueues.h"
 #include "SystemComm.h"
 
 // ********** private definitions **********
 
+typedef enum Msg_IDs
+{
+    MSG_ID_TEST = 0,
+    MSG_ID_OFF_BUTTON_PRESS,
+    NUM_OF_MSG_IDS
+} MSG_ID_T;
+
 // ********** private data **********
 
 
+// ********** private function prototypes **********
+
+
 /*************************************************************************
  * @brief initSystemComm
  * The initSystemComm function initializes the SystemComm module.
@@ -35,6 +50,96 @@
  *************************************************************************/
 void initSystemComm( void )
 {
+
 }
 
+/*************************************************************************
+ * @brief initSystemComm
+ * The initSystemComm function initializes the SystemComm module.
+ * @details
+ * Inputs : none
+ * Outputs : SystemComm module initialized.
+ * @param none
+ * @return none
+ *************************************************************************/
+void execSystemComm( void )
+{
+    // TODO - this is ugly preliminary test code - nowhere near ready for code review
+    BOOL isThereMsgToXmit;
+    BOOL isThereMsgRcvd;
+    U08  data[sizeof(MESSAGE_WRAPPER_T)];
+    U32 dataSize;
+    MESSAGE_WRAPPER_T msg;
 
+    // get next msg to transmit to UI
+    isThereMsgToXmit = getFromMsgQueue( MSG_Q_CAN_HD_2_UI, &msg );
+    if ( TRUE == isThereMsgToXmit )
+    {
+        U08 *dataPtr = data;
+
+        memcpy( dataPtr, &(msg.msg.hdr), sizeof(MESSAGE_HEADER_T) );
+        memcpy( dataPtr+sizeof(MESSAGE_HEADER_T), &(msg.msg.cargo), msg.msg.hdr.cargoLen );
+        memcpy( dataPtr+(sizeof(MESSAGE_HEADER_T) + msg.msg.hdr.cargoLen), &(msg.crc), sizeof(U08) );
+
+        addToCommBuffer( COMM_BUFFER_CAN_HD_2_UI, dataPtr, MESSAGE_OVERHEAD_SIZE + msg.msg.hdr.cargoLen );
+    }
+
+    // actually transmit any pending messages
+    dataSize = getFromCommBuffer( COMM_BUFFER_CAN_HD_2_UI, data, sizeof(MESSAGE_WRAPPER_T) );
+    if ( dataSize <= 8 )
+    {
+        canTransmit( canREG1, canMESSAGE_BOX1, data );
+    }
+
+    // queue any received CAN messages
+    if ( FALSE != canIsRxMessageArrived( canREG1, canMESSAGE_BOX2 ) )
+    {
+        MESSAGE_WRAPPER_T rcvMsg;
+        U08 *dataPtr = data;
+
+        canGetData( canREG1, canMESSAGE_BOX2, data );
+        blankMessageInWrapper( &rcvMsg );
+        memcpy( &(rcvMsg.msg.hdr), dataPtr, sizeof(MESSAGE_HEADER_T) );
+        memcpy( &(rcvMsg.msg.cargo), dataPtr+sizeof(MESSAGE_HEADER_T), rcvMsg.msg.hdr.cargoLen );
+        memcpy( &(rcvMsg.crc), dataPtr+(sizeof(MESSAGE_HEADER_T)+rcvMsg.msg.hdr.cargoLen), sizeof(U08) );
+        addToMsgQueue( MSG_Q_CAN_UI_2_HD, &rcvMsg );
+    }
+
+    // see if any messages received
+    isThereMsgRcvd = getFromMsgQueue( MSG_Q_CAN_UI_2_HD, &msg );
+    if ( TRUE == isThereMsgRcvd )
+    {
+        switch ( msg.msg.hdr.msgID )
+        {
+            case MSG_ID_OFF_BUTTON_PRESS:
+                userConfirmOffButton();
+                break;
+            default:
+                break;
+        }
+    }
+}
+
+/*************************************************************************
+ * @brief sendOffButtonMsgToUI
+ * The sendOffButtonMsgToUI function constructs an off button msg to the UI \n
+ * and queues the msg for transmit on the appropriate CAN channel.
+ * @details
+ * Inputs : none
+ * Outputs : Off button msg constructed and queued.
+ * @param none
+ * @return TRUE if msg successfully queued for transmit, FALSE if not
+ *************************************************************************/
+BOOL sendOffButtonMsgToUI( void )
+{
+    BOOL result;
+    MESSAGE_WRAPPER_T msg;
+
+    blankMessageInWrapper( &msg );
+    msg.msg.hdr.msgID = MSG_ID_OFF_BUTTON_PRESS;
+    msg.msg.hdr.cargoLen = 0;
+    result = addToMsgQueue( MSG_Q_CAN_HD_2_UI, &msg );
+
+    return result;
+}
+
Index: App/Services/SystemComm.h
===================================================================
diff -u -ree310a2e5262c05bf0dc0eb0d84da0ee50bac7fe -r7d70e839bc71f6fc37da8cd12eecb374841882df
--- App/Services/SystemComm.h	(.../SystemComm.h)	(revision ee310a2e5262c05bf0dc0eb0d84da0ee50bac7fe)
+++ App/Services/SystemComm.h	(.../SystemComm.h)	(revision 7d70e839bc71f6fc37da8cd12eecb374841882df)
@@ -19,8 +19,13 @@
 
 #include "Common.h"
 
+// ********** public definitions **********
+
 // ********** public function prototypes **********
 
 void initSystemComm( void );
+void execSystemComm( void );
 
+BOOL sendOffButtonMsgToUI( void );
+
 #endif
Index: App/Tasks/TaskGeneral.c
===================================================================
diff -u -r9aec79f151c686b730888c98f70f53ad958fe9b5 -r7d70e839bc71f6fc37da8cd12eecb374841882df
--- App/Tasks/TaskGeneral.c	(.../TaskGeneral.c)	(revision 9aec79f151c686b730888c98f70f53ad958fe9b5)
+++ App/Tasks/TaskGeneral.c	(.../TaskGeneral.c)	(revision 7d70e839bc71f6fc37da8cd12eecb374841882df)
@@ -17,11 +17,15 @@
 #include "gio.h"
 #include "lin.h"
 
+#include "Common.h"
 #include "AlarmLamp.h"
 #include "OperationModes.h"
+#include "SystemComm.h"
 #include "WatchdogMgmt.h"
 #include "TaskGeneral.h"
 
+static U32 ctr = 0;  // test code
+
 /*************************************************************************
  * @brief taskGeneral
  * The taskGeneral function handles the scheduled General Task interrupt.\n
@@ -35,6 +39,11 @@
  *************************************************************************/
 void taskGeneral( void )
 {
+    // test code
+    if ( ++ctr >= 40 ) { sendOffButtonMsgToUI(); ctr = 0; }
+    // manage system communication
+    execSystemComm();
+
     // run operation mode state machine
     execOperationModes();
 
Index: HD.dil
===================================================================
diff -u -rbbd766eed69a6ae143a42731965848da85fd4500 -r7d70e839bc71f6fc37da8cd12eecb374841882df
--- HD.dil	(.../HD.dil)	(revision bbd766eed69a6ae143a42731965848da85fd4500)
+++ HD.dil	(.../HD.dil)	(revision 7d70e839bc71f6fc37da8cd12eecb374841882df)
@@ -1,4 +1,4 @@
-# RM46L852PGE 10/08/19 14:27:47
+# RM46L852PGE 10/08/19 17:59:56
 # 
 ARCH=RM46L852PGE
 # 
@@ -105,7 +105,7 @@
 DRIVER.SYSTEM.VAR.VIM_CHANNEL_18_MAPPING.VALUE=18
 DRIVER.SYSTEM.VAR.PMM_LOGIC_PD2_STATEVALUE.VALUE=0x5
 DRIVER.SYSTEM.VAR.CLKT_VCLK3_DOMAIN_DISABLE.VALUE=0
-DRIVER.SYSTEM.VAR.FLASH_ECC_ENABLE.VALUE=0
+DRIVER.SYSTEM.VAR.FLASH_ECC_ENABLE.VALUE=1
 DRIVER.SYSTEM.VAR.FLASH_BANKS.VALUE=4
 DRIVER.SYSTEM.VAR.CORE_MPU_REGION_9_SUB_4_DISABLE.VALUE=0
 DRIVER.SYSTEM.VAR.CORE_MPU_REGION_2_SUB_2_DISABLE.VALUE=0
@@ -628,7 +628,7 @@
 DRIVER.SYSTEM.VAR.VIM_CHANNEL_103_NAME.VALUE=etpwm7TripZoneInterrupt
 DRIVER.SYSTEM.VAR.PBIST_ALGO_16.VALUE=0
 DRIVER.SYSTEM.VAR.CLKT_VCLK2_DIVIDER.VALUE=1
-DRIVER.SYSTEM.VAR.RAM_LINK_LENGTH.VALUE=0x0002EB00
+DRIVER.SYSTEM.VAR.RAM_LINK_LENGTH.VALUE=0x0002eb00
 DRIVER.SYSTEM.VAR.CORE_MPU_REGION_11_END_ADDRESS.VALUE=0x080017ff
 DRIVER.SYSTEM.VAR.VIM_CHANNEL_30_INT_ENABLE.VALUE=0
 DRIVER.SYSTEM.VAR.VIM_CHANNEL_22_INT_ENABLE.VALUE=0