文件列表:

freemodbus_AVR\avrdude.conf (239882, 2006-02-25)
freemodbus_AVR\default\dep\demo.o.d (0, 2008-12-04)
freemodbus_AVR\default\Makefile (3102, 2007-07-27)
freemodbus_AVR\demo.c (3231, 2007-07-27)
freemodbus_AVR\demo_rtu.bat (83, 2006-05-01)
freemodbus_AVR\excoils.c (3819, 2007-07-27)
freemodbus_AVR\freemodbus.aps (4522, 2007-07-28)
freemodbus_AVR\freemodbus.aws (1171, 2008-12-04)
freemodbus_AVR\functions\mbfunccoils.c (9887, 2007-02-19)
freemodbus_AVR\functions\mbfuncdiag.c (1662, 2006-12-07)
freemodbus_AVR\functions\mbfuncdisc.c (4613, 2007-07-27)
freemodbus_AVR\functions\mbfuncholding.c (12197, 2007-07-27)
freemodbus_AVR\functions\mbfuncinput.c (4835, 2007-07-27)
freemodbus_AVR\functions\mbfuncother.c (3532, 2007-07-27)
freemodbus_AVR\functions\mbutils.c (5096, 2007-07-27)
freemodbus_AVR\include\mb.h (19714, 2006-12-07)
freemodbus_AVR\include\mbconfig.h (5047, 2007-07-27)
freemodbus_AVR\include\mbframe.h (3788, 2006-12-07)
freemodbus_AVR\include\mbfunc.h (3114, 2006-12-07)
freemodbus_AVR\include\mbport.h (4881, 2006-12-07)
freemodbus_AVR\include\mbproto.h (3677, 2006-12-07)
freemodbus_AVR\include\mbutils.h (4218, 2006-12-07)
freemodbus_AVR\Makefile22 (2876, 2006-09-04)
freemodbus_AVR\mb.c (12678, 2007-07-27)
freemodbus_AVR\port\mbcrc.c (5057, 2006-05-14)
freemodbus_AVR\port\port.h (4177, 2007-07-27)
freemodbus_AVR\port\portevent.c (1755, 2007-07-27)
freemodbus_AVR\port\portserial.c (3622, 2007-07-27)
freemodbus_AVR\port\porttimer.c (2730, 2007-07-27)
freemodbus_AVR\rtu\mbcrc.c (5529, 2007-07-27)
freemodbus_AVR\rtu\mbcrc.h (1771, 2006-12-07)
freemodbus_AVR\rtu\mbrtu.c (11710, 2007-07-27)
freemodbus_AVR\rtu\mbrtu.h (2380, 2006-12-07)
freemodbus_AVR\说明.txt (362, 2007-07-30)
freemodbus_AVR\default\dep (0, 2008-12-04)
freemodbus_AVR\default (0, 2008-12-04)
freemodbus_AVR\functions (0, 2007-07-30)
freemodbus_AVR\include (0, 2007-07-30)
freemodbus_AVR\port (0, 2007-07-30)
... ...

FREEMODBUS 0.4 AVR EXAMPLE ========================== REQUIREMENTS ============ This example contains a simple demo program for FreeMODBUS for an ATMega168 processor. It requires a wired serial port to a host processor and a Modbus Master Software on the PC side to be useful. Demo versions of Modbus Masters can be found in [1] and [2]. In addition it requires an ATMega168 target microcontroller. The micro- controller must be configured for 20Mhz if the binary image is going to be used. Otherwise the constant F_CPU in the Makefile must be changed and the source code recompiled. INSTALLATION ============ If avrdude [3] is used for flashing the Makefile contains a target 'flash' which can be executed by calling 'make flash'. This programs the micro- controller with the current binary named 'demo.hex'. SOURCE ====== If one wants to recompile the software the WinAVR tools should be installed if the host platform is Microsoft Windows. For Unix the necessary tools must be recompiled from source. The WinAVR tools can be found at [4]. TESTING ======= Start the Modbus Sample Application and test if the input registers starting at protocol address 1000 can be read. There are four registers value available and the output should look like: Polling slave (Ctrl-C to stop) ... [1000]: ***74 [1001]: 0 [1002]: 0 [1003]: 0 Polling slave (Ctrl-C to stop) ... [1000]: -8831 [1001]: 0 [1002]: 0 [1003]: 0 Polling slave (Ctrl-C to stop) ... The simple testing utility used in the 'demo_rtu.bat' script can be found at [5]. PROBLEMS ======== If the provided binary is not working as expected make sure that the fuse bits for the microcontroller are programmed correctly. In addition it would be a good idea to download a simple serial test programm to test serial communication with the host. The fuse bits required for an ATMega168 with an 20Mhz crystal must be set to the following values: Fuse Low Byte: 1XXXXXX | CKDIV8 The other values depend on the crystal used and the startup time. The authors configuration used a value of 0xFF. Again if avrdude is used the value can be set by: avrdude -p m168 -c stk200 -U lfuse:w:0xFF:m where the 0xFF at the end of line is the actual value. [1] WinTech ModScan32: http://www.win-tech.com/html/modscan32.htm [2] Modus Poll: http://www.modbustools.com/modbus_poll.asp [3] AVRDUDE AVR Downloader/UploaDEr: http://www.nongnu.org/avrdude/ [4] WinAVR: http://winavr.sourceforge.net/ [5] FieldTalk Modpoll: http://www.focus-sw.com/fieldtalk/modpoll.html Version: $Id: README.txt,v 1.1 2006/05/08 21:07:01 wolti Exp $

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