https://learn.adafruit.com/debug-arduino-uno-atmega328p-with-adafruit-ch552-qt-py-and-debugwire/introduction
Introduction | Debug Arduino Uno/ATmega328P with Adafruit CH552 QT Py and debugWire | Adafruit...
Using Adafruit CH552 QT Py as debug probe and Arduino IDE 2 to do breakpoint, single stepping, etc on a 8-bit Arduino.
arduino uno
https://hackaday.com/tag/ch552/
CH552 | Hackaday
hackaday