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40 lines
1.4 KiB
Plaintext
40 lines
1.4 KiB
Plaintext
This port was done with a AT91SAM7S-EK which contained a
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AT91SAM7S64 processor. The compiler was the GNU ARM compiler
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and tools from Yagarto project.
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The hardware was modified by severing the I-PA5 (RXD0),
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I-PA6 (TXD0), I-PA7 (RTS0) pads and rerouting those
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signals to a DS75176 RS-485 transceiver.
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PIN SIGNAL AT91SAM7S
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--- ------ ---------
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1 RO RXD0
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2 /RE RTS
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3 DE RTS
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4 DI TXD0
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5 GND GND
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6 DO n/c
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7 DO n/c
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8 +5V From EXT_VCC via 5V Regulator
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The makefile allows you to build just the dlmstp or a simple
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server, both for programming into the flash memory of the processor.
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The 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, and
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then used the SAM-BA to send the resulting .bin file to the
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board using a J-Link. To debug the code from flash, run the
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J-Link GDB Server and then:
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> arm-elf-gdb bacnet.elf
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I got the crt.s, at91sam7s256.ld, blinker.c, init.c, isr.c, and
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timer.c from James P Lynch. I created the rs485.c based on the
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initialization sequence from serial.c by Keil Electronik. I
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got the at91sam7s256.h file from Atmel via the Keil website.
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I started with the makefile from James P Lynch, but it didn't work
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for me. I then used some ideas from FreeRTOS makefile, and
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created my own makefile from scratch.
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Hopefully you find it useful!
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Steve Karg
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