esp-hal

Hardware Abstraction Layer crates for the ESP32, ESP32-C2/C3/C6, ESP32-H2, and ESP32-S2/S3 from Espressif.

These HALs are no_std; if you are looking for std support, please use esp-idf-hal instead.

If you have any questions, comments, or concerns, please open an issue, start a new discussion, or join us on Matrix. For additional information regarding any of the crates in this repository, please refer to the relevant crate's README.

Note

This project is still in the relatively early stages of development, and as such there should be no expectation of API stability. A significant number of peripherals currently have drivers implemented but have varying levels of functionality. For most basic tasks, this should be usable already, however some more advanced or uncommon features may not yet be implemented.

Getting Started

For information relating to the development of Rust applications on ESP devices, please first read The Rust on ESP Book.

For information about the HAL and how to use it in your own projects, please refer to the documentation on crates.io for the relevant chip.

Resources

• The Rust Programming Language
• The Embedded Rust Book
• The Rust on ESP Book

HAL Crates

Crate	Target	Technical Reference Manual
esp32-hal	xtensa-esp32-none-elf	ESP32
esp32c2-hal	riscv32imc-unknown-none-elf	ESP32-C2
esp32c3-hal	riscv32imc-unknown-none-elf	ESP32-C3
esp32c6-hal	riscv32imac-unknown-none-elf	ESP32-C6
esp32c6-lp-hal	riscv32imac-unknown-none-elf	N/A
esp32h2-hal	riscv32imac-unknown-none-elf	ESP32-H2
esp32s2-hal	xtensa-esp32s2-none-elf	ESP32-S2
esp32s3-hal	xtensa-esp32s3-none-elf	ESP32-S3

Ancillary Crates

There are a number of other crates within the esp-rs organization which can be used in conjunction with esp-hal:

Crate	Description
esp-alloc	A simple no_std heap allocator
esp-backtrace	Backtrace support for bare-metal applications
esp-ieee802154	Low-level IEEE802.15.4 driver for the ESP32-C6 and ESP32-H2
esp-println	Provides print! and println! implementations
esp-storage	Implementation of embedded-storage traits to access unencrypted flash memory
esp-wifi	no_std Wi-Fi/Bluetooth LE support

Git Hooks

We provide a simple pre-commit hook to verify the formatting of each package prior to committing changes. We strongly encourage use of this git hook.

The hook can be enabled by copying it in to the .git/hooks/ directory:

cp pre-commit .git/hooks/pre-commit

When using this hook, you can choose to ignore its failure on a per-commit basis by committing with the --no-verify flag; however, you will need to be sure that all packages are formatted when submitting a pull request.

MSRV

The Minimum Supported Rust Versions are:

• nightly-2022-09-16 for RISC-V devices (ESP32-C2, ESP32-C3, ESP32-C6, ESP32-H2)
  • This corresponds to the date that the 1.65.0 release was branched from master
• 1.65.0 for Xtensa devices (ESP32, ESP32-S2, ESP32-S3)
• 1.67.0 for all async examples (embassy_hello_world, embassy_wait, etc.)

It should be noted that targeting the Xtensa ISA currently requires the use of the esp-rs/rust compiler fork. Our recommend method of installation is espup.

RISC-V is officially supported by the official Rust compiler.

License

Licensed under either of:

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.