# Debug Arduino Uno/ATmega328P with Adafruit CH552 QT Py and debugWire

## Introduction

Arduino IDE 2 comes with debugging capability for 32-bit Arm based Arduino boards. If you try to select Arduino Uno, you may see "Debugging is not supported by 'Arduino Uno'". This tutorial will show how to adding the missing pieces to debug Arduino Uno and other ATmega328P boards.

This tutorial will demonstrate:

1. How to convert a Adafruit CH552 QT Py into a debugWire debug probe/programmer combo (USBtinyISP compatible). 
2. Setting up Arduino IDE 2 with board support package.
3. Automatically set fuses to enable debugging on ATmega328P.
4. Doing debugging.
5. Automatically set fuses back and restore Arduino bootloader.

![](https://cdn-learn.adafruit.com/assets/assets/000/132/917/medium800/hacks_PXL_20241008_153646942.jpg?1728402550)

Warning: The debugging process will modify fuses to kick Arduino into debug mode. Such mode can only be exited with a functional debugger probe or High Voltage Parallel Programming. If your debugger probe is not fully functional to communicate with the Uno, your Uno may be bricked!

- [Next Page](https://learn.adafruit.com/debug-arduino-uno-atmega328p-with-adafruit-ch552-qt-py-and-debugwire/program-ch552.md)

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### Adafruit CH552 QT Py - 8051 Dev Board with STEMMA QT

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What a cutie pie! Or is it... a QT Py? This diminutive dev board comes with a throwback processor - an 8-bit 8051! This tiny core is a big change from something like the the [ESP32-S3 QT Py with two 240MHz 32-bit cores](https://www.adafruit.com/product/5700), but there's lots of...

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 **Arduino Uno** is a microcontroller board based on the ATmega328P ([datasheet](https://cdn-shop.adafruit.com/product-files/4806/4806_Atmel-7810-Automotive-Microcontrollers-ATmega328P_Datasheet.pdf)). It has 14 digital input/output pins (of which 6 can be used as PWM...

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