FREE Reverse Engineering Self-Study Course HERE
Assembly Language on an AVR Microcontroller.
In the fascinating world of Reverse Engineering, I have discovered a profound and empowering truth. To truly build, innovate, and secure our future, we must clearly see our foundation. Right now, Data and Computer Science are standing at a critical crossroads. As AI accelerates our capabilities, it also layers immense abstraction over the foundational truths of our digital world. We are at risk of trading the empowering clarity of true comprehension for comfortable convenience, wrapping our infrastructure in black boxes that distance us from the core.
But technology is not magic. It is beautiful, orchestrated logic. When we push the boundaries of innovation or need to uncover a vulnerability hidden deep within a compiled binary, an AI wrapper alone will not be enough. Our greatest strength and our ultimate security lie in understanding the ground truth of Data and Computer Science.
This is exactly why this 24 lesson series on AVR Assembly is far more than an educational exercise. It is a vibrant celebration of the soul of STEM. It is a deliberate, empowering choice to look past the abstraction and become an Assembler. To be an Assembler is to serve as the vital bridge between human intent and physical reality. It means cultivating the patience and discipline to piece together complex systems from their most fundamental, atomic units. An Assembler does not just consume high-level logic or guess at how a system functions. An Assembler orchestrates the raw physics of the hardware itself, uniting brilliant software with the uncompromising reality of the machine.
Together, we will step beyond the bloated compilers and APIs to reconnect with the bare metal. By mastering the precise language of registers, memory addresses, and raw clock cycles on a microscopic chip, we reclaim complete ownership of our craft. We illuminate the silicon and transform mystery into mastery.
If the next generation of developers relies solely on generative models and abstracted code, they will become mere passengers on the journey of technological progress. This series is about forging visionary and resilient architects. It is about cultivating the brilliant, inquisitive mindset of Reverse Engineering so anyone can look into a compiled binary, effortlessly decode its secrets, and confidently command its electrical heartbeat. We owe it to the future of Data and Computer Science to ensure that human engineers remain the inspired, unquestioned masters of the machine.
This will take a few years to develop by hand, but building a lasting legacy of true understanding is a journey worth every single moment.
If you are following along with these tutorials, we recommend the ELEGOO UNO Project Super Starter Kit as a great starting point for your hardware.
sudo apt update
sudo apt install binutils-avr avrdudebrew update
brew install avr-binutils avrdudeThe tools will be installed to /opt/homebrew/opt/avr-binutils/bin/. Add it to your PATH:
export PATH="/opt/homebrew/opt/avr-binutils/bin:$PATH"brew update
brew install avr-binutils avrdudeThe tools will be installed to /usr/local/opt/avr-binutils/bin/. Add it to your PATH:
export PATH="/usr/local/opt/avr-binutils/bin:$PATH"- Install MSYS2
- Open the UCRT64 terminal and run:
pacman -Syu
pacman -S mingw-w64-ucrt-x86_64-avr-binutils avrdudeAdd C:\msys64\ucrt64\bin to your system PATH.
- Download the AVR Toolchain for Windows from Microchip
- Download AVRDUDE
- Add both
bin/directories to your systemPATH.
| Tool | Description |
|---|---|
avr-as |
Assembler |
avr-ld |
Linker |
avr-objcopy |
Object file copy / format conversion |
avr-objdump |
Object file disassembler |
avr-size |
ELF section size reporter |
avrdude |
Microcontroller programmer |
This lesson will teach you how to implement the Serial demo on an ATmega328P using pure AVR assembly.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to blink the built-in LED on an ATmega328P using pure AVR assembly.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to use Timer 1 and Pulse Width Modulation (PWM) to smoothly fade an LED on an ATmega328P using pure AVR assembly.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to control an RGB LED by manipulating multiple output pins simultaneously using pure AVR assembly.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to read digital inputs and use internal pull-up resistors to control an LED based on push buttons using pure AVR assembly.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to generate a beeping sound using an active buzzer and pure AVR assembly.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to generate musical tones (frequencies) using a passive buzzer and Timer1 CTC mode in pure AVR assembly.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to detect physical orientation and gravity using a digital tilt switch in pure AVR assembly.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to control a mechanical Servo Motor by generating precise Pulse Width Modulation (PWM) signals using Timer1 in pure AVR assembly.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to implement sub-millisecond precision timing loops to measure physical distance using an HC-SR04 ultrasonic sensor in pure AVR assembly.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to write a software driver for a single-wire digital communications protocol to read humidity and temperature from a DHT11 sensor in pure AVR assembly.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to interface with the physical analog world by directly commanding the ATmega328P's Analog to Digital Converter (ADC) peripheral in pure AVR assembly.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to write a high-speed assembly loop to visualize the invisible digital data packets transmitted through the air by a TV remote control.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to write a software driver for a 16x2 Character LCD Display (HD44780), utilizing advanced bit manipulation (BST/BLD) to correct hardware wiring inconsistencies in pure AVR assembly.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to read a 10-bit analog Thermistor value via the ADC and implement a "repeated subtraction" algorithm to convert the 16-bit binary integer into ASCII text digits for display on a 16x2 LCD screen.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to expand your microcontroller's outputs by implementing a custom Serial Peripheral interface driver (bit-banging) to drive an 8-bit Shift Register, animating a "Knight Rider" LED chaser.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to implement a full two-way Serial Communications (USART) interface in bare metal assembly, parsing incoming byte commands from a desktop computer to remotely control the 8-bit Shift Register array.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to divide ADC sensor data using a "repeated subtraction" algorithm and use the SEC (Set Carry) and ROL (Rotate Left through Carry) instructions to dynamically build and display an LED bar graph on a Shift Register.
-> Click HERE to read the lesson and see the code.
This lesson introduces Harvard Architecture memory spaces by teaching you how to permanently bake data arrays into the ATmega328P's Flash Program Memory (.text) and retrieve them using 16-bit pointer arithmetic and the Z-Pointer (LPM) to draw numbers on a 7-Segment Display.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to write time-critical execution loops to achieve time-domain multiplexing, using the Persistence of Vision (POV) optical illusion to drive a 4-Digit 7-Segment Display with a minimal number of pins.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to configure 16-bit Timer Peripherals in Fast PWM Mode to generate high-frequency logic signals that control the speed and direction of a physical DC Motor via an L293D H-Bridge driver.
-> Click HERE to read the lesson and see the code.
This lesson will teach you how to use Galvanic Isolation and Electromechanical Relays to safely control high-voltage, high-current appliances using low-voltage logic signals from your ATmega328P.
-> Click HERE to read the lesson and see the code.
This lesson will teach you the physics of Stepper Motors and how to write a manual "Wave Drive" sequence algorithm in assembly to control a ULN2003 Darlington Array Driver.
-> Click HERE to read the lesson and see the code.
This final lesson combines hardware interrupts, peripheral polling, and wave-drive sequence algorithms to build a completely wireless, remote-controlled motorized system in pure assembly.
-> Click HERE to read the lesson and see the code.
See LICENSE.