Hi Mario,

JTAGIDE3 is a hardware debugger not Serial. With the Ice3 you can use native Atmel Studio debugging.

Alternatively if Serial Usb is not available you can use SoftwareSerial and a couple of spare digital pins via an ftdi usb connection

We do not support native Atmel debugging in this forum because it is a big complex topic but here are a few tips:-

The atmel debugger does not understand an .ino project but we hope there will be a release of visual micro over the next month or two that allows for a ".cpp only" arduino project.

When we compile for arduino we copy all of the .ino source code into a temporary [sketch].cpp source file. It is the .cpp that is compiled into a .elf file.

Switch on "tools>options>visual micro>compiler>show build folder" then build your arduino project.

After the build, the output window will show the name of the temporary build folder.

Atmel studio can debug the .elf file that will exist in the temporary build folder.

Use "File>Open object file for debugging", this is an Atmel Studio feature. It allows you to open the .elf in the build folder described above.

When you open a .elf for debugging a file mapping window will open. The window is more intelligent than it appears to be. Paste folder names to the right side of the mapping window and it will auto complete the file names for you.

After opening the elf for debugging, atmel studio will create a new read-only solution containing the code of the .elf. Save the solution so it can be re-used after making code changes and building your arduino project.

This solution is "clunky" I know. I hope that Visual Micro is able to provide a more seemless solution in the not to distant future  Smiley

Note: To use hardware debugging with the current Arduino boards you need to hack the Arduino reset pin

I hope this helps