SwiftIO is a Swift framework for microcontrollers that provides an easy-to-use interface for hardware peripherals. It abstracts low-level hardware details into Swift classes, allowing developers to interact with GPIO, ADC, PWM, timers, communication protocols (I2C, SPI, UART), and more without dealing with complex register manipulation. The library is structured into a C layer (CSwiftIO) for direct hardware access and a Swift layer that wraps this functionality in a safe, idiomatic API. It emphasizes error handling through Swift's Result type and provides consistent patterns for resource management and peripheral interaction.
Gobot is a Go framework for robotics, physical computing, and the Internet of Things. It provides a consistent hardware abstraction layer (HAL) over dozens of single-board computers (Raspberry Pi, BeagleBone, Intel Edison, Jetson, etc.), microcontrollers (Arduino via Firmata, Digispark), and communication protocols (GPIO, I2C, SPI, BLE, serial, MQTT, NATS, MAVLink). The architecture is modular: platform-specific adaptors implement core interfaces (DigitalPinner, PWMPinner, I2cBusAdaptor, etc.) and are composed from reusable building blocks in the `platforms/adaptors` package. Drivers for sensors, actuators, displays, and robots (Sphero, Parrot drones, DJI Tello, GoPiGo3) are organized by bus type (gpio, i2c, spi, ble, aio, onewire, serial) and share a common lifecycle pattern with event publishing and command registration. A built-in HTTP API server (with optional basic auth and CORS) exposes robot state and commands over REST and Server-Sent Events, and includes an embedded web UI (Robeaux). The framework supports both high-level orchestration via `Robot` and `Manager` and low-level 'metal' usage for direct hardware control. External dependencies include `periph.io` for GPIO, `tinygo.org/x/bluetooth` for BLE, `gocv.io/x/gocv` for computer vision, and `go.bug.st/serial` for serial communication. The codebase is extensively tested with mock filesystem and syscall infrastructure, and uses functional options for configuration throughout.
RVX is a fully functional RISC-V RV32I microcontroller IP core written in synthesizable Verilog, targeting FPGAs (specifically Digilent Arty A7 and Cmod A7 boards). It implements the RV32I base ISA v2.1 plus the Zicsr extension and Machine-Level ISA v1.13. The core includes a custom system bus (`rvx_bus`) that can be parameterized with an arbitrary number of memory-mapped slaves, and a set of peripherals: UART, GPIO, SPI, and machine timer (`mtime`/`mtimecmp`). The repository provides complete example projects for bare-metal and FreeRTOS, including board-specific wrapper modules, constraint files, and TCL scripts for Vivado project creation. The software examples use CMake with the RISC-V GCC toolchain and the `libsteel` hardware abstraction library. A comprehensive verification suite covers all RV32I instructions via RISC-V Architecture Test programs, alongside Cocotb-based peripheral tests and a Verilator simulation framework with C++ harness. The bus interface uses a simple request/response handshake with write strobes, which is clean but non-standard (not AXI/Wishbone). The core is a single-monolithic file (~1300 lines) with a 4-state FSM and no pipelining, making it compact but harder to modify. Overall, the repository is a well-documented, professionally structured open-source hardware project with strong testing practices, suitable for FPGA-based embedded systems education or low-complexity control applications.
This repository is a comprehensive bare-metal microcontroller programming guide, providing step-by-step examples from minimal firmware to a full embedded web server with a device dashboard. The code targets ARM Cortex-M and RISC-V microcontrollers (STM32, TI TM4C, RP2040, ESP32-C3, nRF52840, etc.) and uses only GCC, a datasheet, and the Mongoose networking library. The architecture is bare-metal, single-threaded with an event loop in the webserver step; it demonstrates direct register manipulation, interrupt handling, UART, SysTick, clock configuration, printf retargeting via newlib syscalls, CMSIS integration, and Ethernet with built-in TCP/IP (MIP). The repository also includes reusable project templates for blinky, CLI, and LittleFS filesystem. Despite being educational, the code is production-quality and follows embedded best practices such as non-blocking timers, hardware abstraction layers (hal.h), and modular startup code.