To whom it may interest, got this working (including features such as autocompletion) with an Atmel ICE programmer and Arduino UNO following these instructions.
Arduino debugging with Atmel Studio 7
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Nice ! - Be careful if you use this and the Arduino IDE on the same projects as the AM Studio software dumps loads of extra files in the Arduino Projects folder and the Arduino IDE then tries to read them next time you open the project in that!
Courty
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Can you debug step-by-step ?