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Async Options

⚠️ Note: This section does not serve as an async tutorial or teaching material. For these purposes, visit official async-book.

esp-hal provides blocking and async API for most of the supported drivers. Drivers are constructed in Blocking mode by default. To set up an async driver, they must be converted to an Async mode using the into_async method. For more information and to get started, check our examples in the esp-hal package.

⚠️ Note: Our Async drivers are not Send because they register interrupts on the current core. Moving them to another core can cause issues. If user needs to send (move) a driver to another core, they should send the Blocking version, and then call into_async on the correct core to bind it correctly.

Embassy

Embassy is an asynchronous (async) framework designed specifically for embedded Rust development; its embassy-executor crate provides an async/await executor which executes a fixed number of tasks, statically allocated at startup, though more can be added later. To spawn more tasks later, you may keep copies of the Spawner, for example by passing it as an argument to the initial tasks. For more information about embassy visit Embassy book.

The esp-rtos crate provides integration between esp-hal and the Embassy asynchronous framework. It provides support for:

  1. Interrupt-mode executor
  2. Multicore-aware thread-mode embassy executor
  3. Embassy time driver
  4. Timer waiter queue

ArielOS

ArielOS is an operating system for secure, memory-safe, low-power IoT. It builds on top of various projects from the Embedded Rust ecosystem, including esp-hal. ArielOS focuses on tight integration, adding missing OS features like a multicore scheduler, secure networking, portable drivers, and a unified build system. The result is a powerful alternative to C-based Real-Time Operating System (RTOS) solutions, but in pure Rust. It has great integrations with embassy, and can be used together with embassy in various ways.

RTIC

Real-Time Interrupt-driven Concurrency (RTIC) is a community supported concurrency framework for building real-time systems. Real time tasks are not async, but “software” tasks are async. Currently, only ESP32-C3 and ESP32-C6 are supported.