diff --git a/bacnet-stack/mstp.h b/bacnet-stack/mstp.h
index df95c34e..03269bf6 100644
--- a/bacnet-stack/mstp.h
+++ b/bacnet-stack/mstp.h
@@ -107,6 +107,17 @@ typedef enum {
 /* larger values for this timeout, not to exceed 100 milliseconds.) */
 #define Tusage_timeout 25
 
+/* The minimum time after the end of the stop bit of the final octet of a */
+/* received frame before a node may enable its EIA-485 driver: 40 bit times. */
+/* At 9600 baud, 40 bit times would be about 4.166 milliseconds */
+/* At 19200 baud, 40 bit times would be about 2.083 milliseconds */
+/* At 38400 baud, 40 bit times would be about 1.041 milliseconds */
+/* At 57600 baud, 40 bit times would be about 0.694 milliseconds */
+/* At 76800 baud, 40 bit times would be about 0.520 milliseconds */
+/* At 115200 baud, 40 bit times would be about 0.347 milliseconds */
+/* 40 bits is 4 octets including a start and stop bit with each octet */
+#define Tturnaround  (40UL)
+/* turnaround_time_milliseconds = (Tturnaround*1000UL)/RS485_Baud; */
 
 struct mstp_port_struct_t {
     MSTP_RECEIVE_STATE receive_state;
@@ -240,17 +251,6 @@ struct mstp_port_struct_t {
 #define DEFAULT_MAX_MASTER 127
 #define DEFAULT_MAC_ADDRESS 127
 
-/* The minimum time after the end of the stop bit of the final octet of a */
-/* received frame before a node may enable its EIA-485 driver: 40 bit times. */
-/* At 9600 baud, 40 bit times would be about 4.166 milliseconds */
-/* At 19200 baud, 40 bit times would be about 2.083 milliseconds */
-/* At 38400 baud, 40 bit times would be about 1.041 milliseconds */
-/* At 57600 baud, 40 bit times would be about 0.694 milliseconds */
-/* At 76800 baud, 40 bit times would be about 0.520 milliseconds */
-/* At 115200 baud, 40 bit times would be about 0.347 milliseconds */
-/* 40 bits is 4 octets including a start and stop bit with each octet */
-#define Tturnaround  40
-
 #ifdef __cplusplus
 extern "C" {
 #endif                          /* __cplusplus */
diff --git a/bacnet-stack/ports/atmega168/Makefile b/bacnet-stack/ports/atmega168/Makefile
index 97cf86ad..a97ce2e0 100644
--- a/bacnet-stack/ports/atmega168/Makefile
+++ b/bacnet-stack/ports/atmega168/Makefile
@@ -75,7 +75,8 @@ ASMFLAGS += -x assembler-with-cpp -Wa,-gdwarf2
 
 ## Linker flags
 LDFLAGS = $(COMMON)
-LDFLAGS += -Wl,-Map=$(TARGET).map,-L=.,-l$(TARGET)
+#LDFLAGS += -Wl,-Map=$(TARGET).map,-L=.,-l$(TARGET)
+LDFLAGS += -Wl,-Map=$(TARGET).map
 
 ## Intel Hex file production flags
 HEX_FLASH_FLAGS = -R .eeprom
@@ -84,7 +85,8 @@ HEX_EEPROM_FLAGS += --set-section-flags=.eeprom="alloc,load"
 HEX_EEPROM_FLAGS += --change-section-lma .eeprom=0 --no-change-warnings
 
 ## Objects that must be built in order to link
-OBJECTS = $(COBJ) $(DEMOOBJ)
+#OBJECTS = $(COBJ) $(DEMOOBJ)
+OBJECTS = $(COBJ)
 
 ## Build
 TARGET_ELF=$(TARGET).elf
diff --git a/bacnet-stack/ports/atmega168/bacnet.aps b/bacnet-stack/ports/atmega168/bacnet.aps
index 2b49780b..323c60b9 100644
--- a/bacnet-stack/ports/atmega168/bacnet.aps
+++ b/bacnet-stack/ports/atmega168/bacnet.aps
@@ -1 +1 @@
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+<AVRStudio><MANAGEMENT><Created>13-Aug-2007 15:08:27</Created><LastEdit>16-Aug-2007 14:41:22</LastEdit><ProjectType>0</ProjectType><Created>13-Aug-2007 15:08:27</Created><Version>4</Version><Build>4, 13, 0, 528</Build><ProjectTypeName>AVR GCC</ProjectTypeName><ICON>241</ICON><ProjectName>bacnet</ProjectName><Created>13-Aug-2007 15:11:07</Created><LastEdit>13-Aug-2007 15:11:07</LastEdit><ICON>241</ICON><ProjectType>0</ProjectType><Created>13-Aug-2007 15:11:07</Created><Version>4</Version><Build>4, 13, 0, 528</Build><ProjectTypeName>AVR 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offset="0"/></Triggers></Debugger><AVRGCCPLUGIN><FILES><SOURCEFILE>main.c</SOURCEFILE><SOURCEFILE>rs485.c</SOURCEFILE><SOURCEFILE>timer.c</SOURCEFILE><SOURCEFILE>dlmstp.c</SOURCEFILE><SOURCEFILE>C:\code\bacnet-stack\crc.c</SOURCEFILE><SOURCEFILE>C:\code\bacnet-stack\mstp.c</SOURCEFILE><HEADERFILE>avr035.h</HEADERFILE><HEADERFILE>hardware.h</HEADERFILE><HEADERFILE>rs485.h</HEADERFILE><HEADERFILE>timer.h</HEADERFILE><HEADERFILE>C:\code\bacnet-stack\mstp.h</HEADERFILE><HEADERFILE>C:\code\bacnet-stack\crc.h</HEADERFILE><HEADERFILE>C:\code\bacnet-stack\dlmstp.h</HEADERFILE></FILES><CONFIGS><CONFIG><NAME>default</NAME><USESEXTERNALMAKEFILE>NO</USESEXTERNALMAKEFILE><EXTERNALMAKEFILE></EXTERNALMAKEFILE><PART>atmega168</PART><HEX>1</HEX><LIST>0</LIST><MAP>0</MAP><OUTPUTFILENAME>bacnet.elf</OUTPUTFILENAME><OUTPUTDIR>default\</OUTPUTDIR><ISDIRTY>1</ISDIRTY><OPTIONS><OPTION><FILE>C:\code\bacnet-stack\crc.c</FILE><OPTIONLIST></OPTIONLIST></OPTION><OPTION><FILE>C:\code\bacnet-stack\mstp.c</FILE><OPTIONLIST></OPTIONLIST></OPTION><OPTION><FILE>dlmstp.c</FILE><OPTIONLIST></OPTIONLIST></OPTION><OPTION><FILE>main.c</FILE><OPTIONLIST></OPTIONLIST></OPTION><OPTION><FILE>rs485.c</FILE><OPTIONLIST></OPTIONLIST></OPTION><OPTION><FILE>timer.c</FILE><OPTIONLIST></OPTIONLIST></OPTION></OPTIONS><INCDIRS><INCLUDE>..\..\</INCLUDE><INCLUDE>.\</INCLUDE></INCDIRS><LIBDIRS/><LIBS/><LINKOBJECTS/><OPTIONSFORALL>-Wall 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diff --git a/bacnet-stack/ports/atmega168/dlmstp.c b/bacnet-stack/ports/atmega168/dlmstp.c
index d10af54d..2800fa31 100644
--- a/bacnet-stack/ports/atmega168/dlmstp.c
+++ b/bacnet-stack/ports/atmega168/dlmstp.c
@@ -40,12 +40,12 @@ uint16_t MSTP_Packets = 0;
 
 /* local MS/TP port data - shared with RS-485 */
 static volatile struct mstp_port_struct_t MSTP_Port;
-/* receive buffer */
-static DLMSTP_PACKET Receive_Packet;
-static DLMSTP_PACKET Transmit_Packet;
 /* buffers needed by mstp port struct */
 static uint8_t TxBuffer[MAX_MPDU];
 static uint8_t RxBuffer[MAX_MPDU];
+/* buffers used by the datalink layer */
+static DLMSTP_PACKET Receive_Packet;
+static DLMSTP_PACKET Transmit_Packet;
 
 #define INCREMENT_AND_LIMIT_UINT16(x) {if (x < 0xFFFF) x++;}
 
diff --git a/bacnet-stack/ports/atmega168/hardware.ods b/bacnet-stack/ports/atmega168/hardware.ods
new file mode 100644
index 00000000..6d06047c
Binary files /dev/null and b/bacnet-stack/ports/atmega168/hardware.ods differ
diff --git a/bacnet-stack/ports/atmega168/main.c b/bacnet-stack/ports/atmega168/main.c
index 7e703ecc..6afd295c 100644
--- a/bacnet-stack/ports/atmega168/main.c
+++ b/bacnet-stack/ports/atmega168/main.c
@@ -36,6 +36,26 @@
 
 void init(void)
 {
+    /* Initialize the Clock Prescaler for ATmega48/88/168 */
+    /* The device is shipped with the CKDIV8 Fuse programmed */
+    /* The default CLKPSx bits are factory set to 0011 */
+    /* Enbable the Clock Prescaler */
+    CLKPR = _BV(CLKPCE);
+    /* CLKPS3 CLKPS2 CLKPS1 CLKPS0 Clock Division Factor
+       ------ ------ ------ ------ ---------------------
+          0      0      0      0             1
+          0      0      0      1             2
+          0      0      1      0             4
+          0      0      1      1             8
+          0      1      0      0            16
+          0      1      0      1            32
+          0      1      1      0            64
+          0      1      1      1           128
+          1      0      0      0           256
+          1      x      x      x      Reserved
+    */
+    /* Set the CLKPS3..0 bits to Prescaler of 1 */
+    CLKPR = 0;
     /* Initialize I/O ports */
     /* For Port DDRx (Data Direction) Input=1, Output=1 */
     /* For Port PORTx (Bit Value) TriState=0, High=1 */
@@ -66,7 +86,9 @@ void task_milliseconds(void)
     while (Timer_Milliseconds) {
         Timer_Milliseconds--;
         /* add other millisecond timer tasks here */
+#if defined(BACDL_MSTP)
         dlmstp_millisecond_timer();
+#endif
     }
 }
 
@@ -90,7 +112,7 @@ int main(void)
         /* BACnet handling */
         pdu_len = datalink_receive(&src, &PDUBuffer[0], MAX_MPDU, 0);
         if (pdu_len) {
-            npdu_handler(&src, &PDUBuffer[0], pdu_len);
+            //npdu_handler(&src, &PDUBuffer[0], pdu_len);
         }
     }
 
diff --git a/bacnet-stack/ports/atmega168/rs485.c b/bacnet-stack/ports/atmega168/rs485.c
index 58d47b84..23e7ec92 100644
--- a/bacnet-stack/ports/atmega168/rs485.c
+++ b/bacnet-stack/ports/atmega168/rs485.c
@@ -124,7 +124,7 @@ void RS485_Send_Frame(
     /* delay after reception - per MS/TP spec */
     if (mstp_port) {
         /* wait about 40 bit times since reception */
-        turnaround_time = (40UL*1000UL)/RS485_Baud;
+        turnaround_time = (Tturnaround*1000UL)/RS485_Baud;
         if (!turnaround_time) {
             turnaround_time = 1;
         }
diff --git a/bacnet-stack/ports/atmega168/timer1.ods b/bacnet-stack/ports/atmega168/timer1.ods
deleted file mode 100644
index 5896796e..00000000
Binary files a/bacnet-stack/ports/atmega168/timer1.ods and /dev/null differ