This debug extension connect the Visual Studio Code debug system onto the Atmel debug backend (atbackend). This enabled debugging of all Atmel microcontrollers that are supported in the Atmel Studio 7 ...
Arduino with an AVR8 microcontroller can be debugged with debugWIRE. This is often done with a debugger from Atmel and Avr Studio. I found the dwire-debug project which contains an opensource ...