Yeah, I'm getting confused myself! I have an STK500, and I can program the
bootloader/program space on the 2560. In addition to the clearly marked ISP
header for the 2560, there is also an ISP header for the 8U2 (don't ask)
which is how I got into trouble! My 8U2 no longer looks like a USB, and I
haven't been successful trying to run flip (flip's a flop). My STK500 and
Atmel Studio 4 apparently can't program the 8U2. I loaded Atmel Studio 6.0
onto another computer, and while it does recognize the 8U2, it wants a USB
STK500 as far as I can tell (haven't tried to learn all of it). Flip does
not like the "combined" 8U2 hex (looks more like html) file I've found on:
And since the code on the 8U2 is bricked, I doubt if flip could load it
My sad story.
>On Behalf Of Austin Hendrix
>I haven't needed to flash the 8u2 on my Mega2560 board, but it should be
possible if you have an ISP.
>Be careful with your terminology; "bootloader" usually refers to the
software on the Atmega2560 that allows loading firmware >over the serial
line, while the 8u2 is the USB to serial conversion chip. Which one are you
On 07/30/2012 02:51 PM, Alan Marconett wrote:
> Has anyone restored (re-flashed) the Atmel 8U2 on the Arduino Mega2560
> Alan KM6VV
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