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Arduino Uno and Mega 2560 Firmwares for the ATmega8U2 This directory contains the firmwares used on the ATmega8U2 on the Arduino Uno and Arduino Mega 2560. The arduino-usbdfu directory contains the DFU bootloader on the 8U2; the arduino-usbserial directory contains the actual usb to serial firmware. Both should be compiled against LUFA 100807. The two .hex files in this directory combine the dfu and serial firmwares into a single file to burn onto the 8U2. To burn (Uno): avrdude -p at90usb82 -F -P usb -c avrispmkii -U flash:w:UNO-dfu_and_usbserial_combined.hex -U lfuse:w:0xFF:m -U hfuse:w:0xD9:m -U efuse:w:0xF4:m -U lock:w:0x0F:m To burn (Mega 2560): avrdude -p at90usb82 -F -P usb -c avrispmkii -U flash:w:MEGA-dfu_and_usbserial_combined.hex -U lfuse:w:0xFF:m -U hfuse:w:0xD9:m -U efuse:w:0xF4:m -U lock:w:0x0F:m Note on USB Vendor IDs (VID) and Product IDs (PID): The arduino-usbdfu project uses Atmel's VID and MCU-specific PIDs to maintain compatibility with their FLIP software. The source code to the arduino-usbserial project includes Atmel's VID and a PID donated by them to LUFA. This PID is used in LUFA's USBtoSerial project, which forms the basis for arduino-usbserial. According to the LUFA documentation, this VID/PID combination is: "For use in testing of LUFA powered devices during development only, by non-commercial entities. All devices must accept collisions on this VID/PID range (from other in-development LUFA devices) to be resolved by using a unique release number in the Device Descriptor. No devices using this VID/PID combination may be released to the general public." The production version of the arduino-usbserial firmware uses the Arduino VID. This is only for use with official Arduino hardware and should not be used on other products.