skarg
43 lines
1.6 KiB
Plaintext
43 lines
1.6 KiB
Plaintext
This port was done with the Atmel ATmega168 using two tools:
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1. The WinAVR compiler avr-gcc (GCC) 4.1.2 (WinAVR 20070525)
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and tools from <http://winavr.sourceforge.net/>, hints and
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sample code from <http://www.avrfreaks.net/> and
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<http://savannah.gnu.org/projects/avr-libc/>
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"avr-binutils, avr-gcc, and avr-libc form the heart of the
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Free Software toolchain for the Atmel AVR microcontrollers."
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2. AVR Studio from Atmel <http://atmel.com/>
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The hardware is expected to utilize the signals as defined
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in the spreadsheet hardware.ods (OpenOffice.org calc).
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Attach a DS75176 RS-485 transceiver (or similar) to the USART.
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DS75176 ATmega168
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------ ---------
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RO RXD
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/RE --choice of I/O
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DE --choice of I/O
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DI TXD
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GND GND
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DO --to RS-485 wire
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DO --to RS-485 wire
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+5V From 5V Regulator
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The makefile allows you to build just the dlmstp or a simple
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server. dlmstp is the datalink layer for MS/TP over RS-485.
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I used the makefile from the command line on Windows:
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C:\code\bacnet-stack\ports\atmega168> make clean all
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I also used the bacnet.aps project file in AVR Studio to
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make the project and simulate it.
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Note that the bacnet stack is currently layed out as encapsulating
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modules that include both client and server functionality for each service.
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The nice thing about the all in one modules that it permits easy unit
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testing. The bad thing is that it puts all the unused code into the build.
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Therefore, until the code is split into separate modules,
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the unused sections must be commented out (use #if 0, #endif).
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Hopefully you find it useful!
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Steve Karg
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