Embedded HAL and Microcontroller Drivers

The embedded-hal crate is Rust's standard abstraction layer for microcontroller peripherals. Instead of writing vendor-specific code for each ARM, RISC-V, or AVR chip, embedded-hal defines traits that represent common hardware interfaces—GPIO, SPI, I2C, UART, timers—so your driver code works across platforms. This series teaches you to harness embedded-hal and Platform Access Crates (PACs) to build production-grade firmware for real microcontroller boards.

Embedded systems demand three things: correctness, efficiency, and portability. Rust's type system enforces safe hardware access at compile time, eliminating entire classes of memory bugs before firmware hits a board. The embedded-hal ecosystem provides tested implementations for STM32, ESP32, nRF52, and 200+ other chips, meaning the patterns you learn here scale from hobby projects to commercial IoT devices.

This series covers GPIO control, serial protocols (I2C, SPI, UART), timer-driven interrupts, and PWM. You will understand the boundary between PACs (low-level register access) and HAL layers (portable abstractions), write reusable drivers for sensors and actuators, and flash firmware to an actual ARM Cortex-M microcontroller. By the end, you'll have the foundation to work with any embedded-hal-compatible board and the confidence to ship embedded Rust code in production.

Articles in this series

• Rust Embedded HAL: GPIO Control Guide
• I2C Communication with Embedded HAL
• SPI Drivers in Rust Embedded HAL
• UART Serial Communication Setup
• Timer Interrupts and PWM Control
• Writing Reusable Embedded Drivers
• Microcontroller PAC vs HAL Layer
• Flashing Firmware to ARM Boards
• Debugging Embedded Rust Code
• Building a Weather Sensor Driver