Every embedded engineer hits the same wall eventually: the HAL call that "just works" until it doesn't, the interrupt that fires at the wrong priority, the delay loop that behaves differently the moment you flip on compiler optimization. Vendor libraries are convenient right up until something breaks underneath them, and then you're stuck debugging a black box instead of your own code.

Bare-Metal Embedded C strips that black box away. This is a hands-on, register-level guide to programming ARM Cortex-M microcontrollers with nothing between your code and the silicon — no operating system, no bloated abstraction layer, no mystery. Just C, the datasheet, and complete control over the hardware.

WHAT YOU'LL ACTUALLY BUILD

Starting from an empty project directory, you'll construct a complete firmware image from scratch — startup code, vector table, linker script, and all — before moving into real, working peripheral drivers:

GPIO control with proper debounced button input
Clock configuration, SysTick, and hardware timers with true microsecond accuracy
Interrupt-driven design using the NVIC, done the way production firmware actually does it
UART communication, including a full serial debug console you'll use for the rest of the book
SPI and I2C drivers wired up to real sensor hardware
ADC sampling and PWM generation for motor control and LED dimming
GDB and OpenOCD debugging techniques for diagnosing the bugs that only show up on real hardware
A complete, multi-peripheral sensor monitoring application that ties every driver together into one properly architected codebase

Every example is a complete, compilable listing, not a fragment you're left to guess around. Every register access is explained at the bit level, so you understand exactly why the code is written the way it is, not just that it works.

WHO THIS BOOK IS FOR

Electronics hobbyists ready to graduate from Arduino and see what's actually happening under those convenience functions
Computer science grads and self-taught developers whose C skills are solid but have never touched real hardware
Working software engineers moving into embedded roles who need to get productive fast
Firmware engineers who've only ever used vendor HAL libraries and want to finally understand what's underneath them
Students who want a textbook that treats them like capable adults, not a slideshow with code screenshots

You should already be comfortable with C — pointers, structs, functions. You don't need any prior embedded experience. Everything else, this book builds from the ground up.

WHY IT'S DIFFERENT

This isn't a reference manual dump or a copy-paste tutorial series. It's written the way a senior firmware engineer would actually explain things to someone they were mentoring — theory first, then real code, then a clear breakdown of why every design decision was made, including the mistakes that trip people up in production: missing volatile qualifiers, uncleared interrupt flags, race conditions between ISRs and the main loop, stack overflows that silently corrupt unrelated memory.

By the last page, you won't just have blinked an LED. You'll have built a complete, interrupt-driven, multi-peripheral firmware application using the same architecture patterns professional teams use in production — and you'll be able to read any Cortex-M datasheet from any vendor and know exactly what to do with it.

Scroll up and grab your copy. Your microcontroller has been waiting.

"Synopsis" may belong to another edition of this title.

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Bare-Metal Embedded C

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Synopsis

STOP GUESSING WHY YOUR FIRMWARE WORKS. START KNOWING.