embedded-hal implementation for ESP8266

This crate implements embedded-hal traits for the ESP8266 series of microcontrollers by using the Arduino SDK. Since LLVM, and therefore rustc, do not support the Xtensa architecture, they must be transpiled to C using mrustc, then compiled using GCC. The esp-rs build script implements this peculiar build process.

Supported traits

• digital::InputPin

• digital::OutputPin

• digital::StatefulOutputPin