Am using Visual Studio 2010 with Arduino 1.0 and the latest and greatest Visual Micro.  (VS is far better than the Arduino IDE).    Everything works fine with a an Arduino Uno board.  I can build code and hit the green triangle and it uploads and runs on the board just fine.   However,  when I build a project on for the Mega2560 board,  it builds the HEX file fine and then it starts to upload and it hangs.  Visual Studio no longer responds to anything and Task Manager is then used to kill the process.

The procedure to upload using avrdude is different between the Uno and the Mega boards.   The Uno a simple switch of " -pm2560 -carduino" works fine. 

Now this same problem is with the Eclipse IDE.

The only successful avrdude upload I have had to Arduino Mega2560 board is.. using this as a bat file...  the two commands must be run RIGHT after each other.

Windows 7

I have both Arduino 1.0RC-2 and Arduino 1.0,  but I only told VM v19 the path to 1.0.  Does VM use the path that you give in the UI or does it take it from an environmental variable?

Is there a setting somewhere I can change that would put avrdude into verbose mode?

Thanks

Jim, this problem is fixed in v21. It worked for me because I have updated usb/fdti drivers for non-arduino boards.

With the arduino usb drivers, the 2560 doesn't reset properly for the upload. We found that the arduino source code forces a reset prior to upload, so vm now does the same.

This has been tested with a previously failing upload to a 2560. Let us know if you have any other issues.

Thanks