skarg
146 lines
5.0 KiB
Plaintext
146 lines
5.0 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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Alternatively, the project also builds using IAR Embedded Workbench AVR.
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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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CStack check for GCC is included in the device object as property 512.
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The compile shows 648 bytes of RAM used, and the ATmega168 has 1024 bytes
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of RAM, leaving 376 for the CStack. Property 512 index 0 returns 376 from
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a ReadProperty request. My understanding is that the remaining unallocated
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RAM is used for the CStack. Keep this in mind when developing.
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After some ReadProperty and WriteProperty requests, the CStack shows
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159 CStack bytes free, meaning that 216 bytes of CStack are used.
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Note that the value 0xC5 (197) was used to paint the CStack.
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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, but have not kept it updated (FIXME).
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Compiler settings for IAR Embedded Workbench (FIXME: makefile?):
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General Options
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---------------
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Target
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Processor configuration: --cpu=m168. ATmega168
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Memory Model: Small
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System configuration: Configure system using dialogs (not in .XCL file)
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Output
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Executable
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Output Directories: Debug\Exe, Debug\Obj, Debug\List
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Library Configuration
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Library: CLIB
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Library Options
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Printf formatter: Small
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Scanf formatter: Medium
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Heap Configuration
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CLIB heap size: 0x10
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System
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CSTACK: 0x200
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RSTACK: 32
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Initialize unused interrupt vectors with RETI instructions (enabled)
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Enable bit defnitions in I/O-Include files. (enabled)
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MISRA C
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not enabled
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C/C++ Compiler
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--------------
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Language
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Language: C
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Require prototypes (not enabled)
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Allow IAR extensions
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Plain 'char' is Signed
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Enable multibyte support (not enabled)
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Code
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Memory utilization:
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Place aggregate initializers in flash memory (enabled)
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Force generation of all global and static variables (not enabled)
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Register utilization:
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Number of registers to lock for global variables: 0
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Use ICCA90 1.x calling convention (not enabled)
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Optimizations
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Size: High (Maximum optimization)
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Number of cross-call passes: Unlimited
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Always do cross call optimization (not enabled)
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Output
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Module type: Override default (not enabled)
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Object module name (not enabled)
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Generate debug information (enabled)
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No error messages in output files (not enabled)
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List
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Output list file (not enabled)
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Output assembler file (enabled)
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Preprocessor
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Ignore standard include paths (not enabled)
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Include paths:
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$PROJ_DIR$
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$PROJ_DIR$\..\..\include
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Preinclude file: (none)
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Defined symbols:
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BACDL_MSTP
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MAX_APDU=50
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BIG_ENDIAN=0
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MAX_TSM_TRANSACTIONS=0
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BACAPP_REAL
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BACAPP_UNSIGNED
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BACAPP_ENUMERATED
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BACAPP_CHARACTER_STRING
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BACAPP_OBJECT_ID
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WRITE_PROPERTY
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Diagnostics
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(not enabled)
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MISRA C
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(not enabled)
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Extra Options
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Use command line options (not enabled)
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Note: The BACnet Stack at Sourceforge source code has to be built
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with lots of different compilers. The IAR compiler has particularly
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strong (pedantic) source checking and generates several warnings when
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compiling the source code. Unfortunately not all warnings can be
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fixed by modifying the source code. Some warnings have therefore been
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disabled in the project file.
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Compiler Diagnostics:
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(Pe550) I initilize all local variables as a best practice.
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Linker Diagnostics:
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(w31) The supplied standard libraries expect char parameters to
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be unsigned (in functions such as strncpy(), etc.). It may
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be possible to recompile the libraries with signed plain char's.
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The BACnet Capabilities include WhoIs, I-Am, ReadProperty, and
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WriteProperty support. The BACnet objects include a Device object,
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10 Binary Value objects, and 10 Analog Value objects. An LED is
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controlled by Binary Value object instance 0. All required object
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properties can be retrieved using ReadProperty. The Present_Value
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property of the Analog Value and Binary Value objects can be
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written using WriteProperty. The Object_Identifier, Object_Name,
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Max_Info_Frames, Max_Master, and baud rate (property 9600) of the
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Device object can be written using WriteProperty.
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Hopefully you find this code useful!
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Steve Karg <skarg@users.sourceforge.net>
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