bacnet_stack/bacnet-stack/ports/atmega8

This port was originally done with the Atmel ATmega168 

I used the following tools:

1. The WinAVR compiler avr-gcc (GCC) 4.1.2 (WinAVR 20070525)

and tools from <http://winavr.sourceforge.net/>, hints and 

sample code from <http://www.avrfreaks.net/> and 

<http://savannah.gnu.org/projects/avr-libc/>.

"avr-binutils, avr-gcc, and avr-libc form the heart of the 

Free Software toolchain for the Atmel AVR microcontrollers."

2. AVR Studio 4 from Atmel <http://atmel.com/>



The hardware is expected to utilize the signals as defined

in the spreadsheet hardware.ods (OpenOffice.org calc).

Attach a DS75176 RS-485 transceiver (or similar) to the USART.

DS75176 ATmega168

------  ---------

 RO       RXD

 /RE      --choice of I/O

 DE       --choice of I/O

 DI       TXD

 GND      GND

 DO       --to RS-485 wire

 DO       --to RS-485 wire

 +5V      From 5V Regulator



The makefile allows you to build a simple server. 

dlmstp is the datalink layer for MS/TP over RS-485.

This project uses an MS/TP Slave Node.



I used the makefile from the command line on Windows:

C:\code\bacnet-stack\ports\atmega168> make clean all



The BACnet Capabilities include ReadProperty support.  

The BACnet objects include only a Device object.  

All required object properties can be retrieved using ReadProperty.  



With full optimization, the statistics on the demo are:



avr-gcc (GCC) 4.2.2 (WinAVR 20071221rc1)

Device: atmega168

Program:    8734 bytes (53.3% Full)

Data:        254 bytes (24.8% Full) (does not include CStack)



Hopefully you find this code useful!



Steve Karg <skarg@users.sourceforge.net>