Hi all! I have a problem with the Atmega8u2 firmware.
I bought the single chip Atmega8U2 (virgin chip)because I want to connect it on the bread board with Atmega328 (with Arduino bootloader).The idea is to create on the bread board Arduino UNO. I made all of the essential links between the various pins (I soldered on the pads of Atmega8u2 very thin copper wires). I used a USB connector type B and I used all the components described in the Arduino UNO schematic. In DFU mode, I programmed the Atmega8u2 as described in the Arduino site. I used the program Flip (Atmel). The firmware is present in the 'Hardware' folder, from the latest release (0023):"Arduino-usbserial-one." I am sure that every connection is correct, the power supply is correct, software and firmware are correct, but when I upload the program ("blink LED"), the output window gives me this error (verbose mode):
avrdude: Version 5.4-arduino, compiled on Oct 11 2007 at 19:12:32 Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
System wide configuration file is "C:...\arduino-0022\hardware/tools/avr/etc/avrdude.conf"
Using Port : \.\COM15 Using Programmer : stk500v1 Overriding Baud Rate : 115200 avrdude: ser_open(): setting dtr avrdude: Send: 0   avrdude: Send: 0   avrdude: Send: 0   avrdude: Recv: avrdude: stk500_getsync(): not in sync: resp=0x00 avrdude: Send: Q   avrdude: Recv: avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51
avrdude done. Thank you.
Please, can someone help me?