Added port for ATmega8 - but not quite small enough yet. Compiled for ATmega168 (but at 8734 bytes of flash).

2008-09-27 22:19:23 +00:00
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+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>