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root / arduino-1.0 / hardware / arduino / firmwares / arduino-usbserial / readme.txt @ 58d82c77

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To setup the project and upload the Arduino usbserial application firmware to an ATMEGA8U2 using the Arduino USB DFU bootloader:
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1. unpack the source into LUFA's Projects directory
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2. set ARDUINO_MODEL_PID in the makefile as appropriate
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3. do "make clean; make"
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4. put the 8U2 into USB DFU mode:
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4.a. assert and hold the 8U2's RESET line
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4.b. assert and hold the 8U2's HWB line
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4.c. release the 8U2's RESET line
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4.d. release the 8U2's HWB line
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5. confirm that the board enumerates as either "Arduino Uno DFU" or "Arduino Mega 2560 DFU"
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6. do "make dfu" (OS X or Linux - dfu-programmer must be installed first) or "make flip" (Windows - Flip must be installed first)
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Check that the board enumerates as either "Arduino Uno" or "Arduino Mega 2560".  Test by uploading a new Arduino sketch from the Arduino IDE.