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Discussions on the software and hardware for Atmel's STK standard.
By wholder
#198118
I’ve developed an Arduino sketch that runs on one Arduino and allows it to control and debug another Arduino, or an AVR-Series micro-controller such as an ATTiny85.  With some limitations, you can use the controlling Arduino to disassemble code, single step code, inspect and modify the current value of registers. I/O ports and SRAM and run code with a hardware breakpoint set.

You can read more about my project at https://sites.google.com/site/wayneholder/debugwire and/or watch a short demo video at https://youtu.be/kI_Z78a_0y0

Wayne