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Re: [avr-chat] Config AVRDUDE for ATmega8U2

From: Jeff Keyzer
Subject: Re: [avr-chat] Config AVRDUDE for ATmega8U2
Date: Thu, 24 Mar 2011 17:00:47 -0500
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I have programmed the ATmega8U2 with

"avrdude -c usbtiny -p at90usb82 -F -U flash:w:file.hex"

What version of avrdude are you using?  I am using 5.10.

Jeff Keyzer
MightyOhm Engineering

On 3/24/2011 4:51 PM, Henry Schwarz wrote:

Hi. I am trying to program the ATmega8U2 on an Arduino Uno (http://arduino.cc/en/Main/ArduinoBoardUno) using the 8U2's ICSP interface. I would like to use AVRDUDE and SparkFun's Pocket AVR Programmer (http://www.sparkfun.com/products/9825).

However, the ATmega8U2 is not listed as a supported device for AVRDUDE, at least according to the list of parts at http://www.nongnu.org/avrdude/user-manual/avrdude_4.html.

I would have tried AT90USB82, as recommended for the Atmel Flip DFU programmer (http://arduino.cc/en/Hacking/DFUProgramming8U2) but that too is not listed.

The discussion at http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=91943 suggests using the -F switch to disable signature checking, and to then use AT90USB162 which apparently is compatible, but again, that part does not seem to be listed as a supported device.

This link (http://forums.adafruit.com/viewtopic.php?f=24&t=19357) from 2007 discusses this question, but they don't say that they successfully tested their recommended config.

Any suggestions on the best way to proceed?

(To avoid confusion, note that the Arduino Uno's main micro is an ATmega328, with a 6-pin ICSP header. The ATmega8U2 on the Uno is a co-processor used for USB apps, with its own separate 6-pin ICSP header.)

Thanks very much,

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