Skip to content
A Hardware Abstraction Layer (HAL) for embedded systems
Branch: master
Clone or download
Pull request Compare This branch is 7 commits ahead, 77 commits behind rust-embedded:master.
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Type Name Latest commit message Commit time
Failed to load latest commit information.


A Hardware Abstraction Layer (HAL) for embedded systems

API reference

How-to: add a new trait

This is the suggested approach to adding a new trait to embedded-hal


Ideally, before proposing a new trait, or set of traits, you should create an issue where the use cases and requirements of the trait(s) are discussed.

These issues will be labeled as discussions in the issue tracker.

Proposing a trait

Once there's consensus on the requirements of the trait(s) a new issue, or a PR, with a proposal should be opened. The proposal should include the actual trait definitions as well as a link to the issue with previous discussion, if there was one.

If the proposal includes more than one alternative then there should be further discussion to try to single out the best alternative.

These issues / PRs will be labeled as proposals in the issue tracker.

Testing period

If there are no objections to the proposal the new trait(s) will land behind the "unproven" Cargo feature and an issue about the new trait(s) will be created. If the proposal includes several alternatives and a single one couldn't be chosen as the best then each alternative will land behind a different Cargo feature, e.g. "alt1" or "alt2".

The traits will undergo a testing period before they move into the set of proven traits. During this period users are encouraged to try to implement the unproven traits for their platforms and to build drivers on top of them. Problems implementing the trait(s) as well as successful implementations should be reported on the corresponding issue.

To leave the unproven state at least two implementations of the trait(s) for different platforms (ideally, the two platforms should be from different vendors) and one generic driver built on top of the trait(s), or alternatively one demo program that exercises the trait (via generic function / trait object), should be demonstrated. If, instead, reports indicate that the proposed trait(s) can't be implemented for a certain platform then the trait(s) will be removed and we'll go back to the drawing board.

Issues used to track unproven APIs will be labeled as unproven-apis in the issue tracker and they may also include the labels needs-impl and needs-driver to signal what's required for them to move to the set of proven traits.


These are (WIP) implementations of embedded-hal for various platforms. Feel free to send a PR adding yours to the list!

You may be able to find even more implementations by searching for the embedded-hal-impl keyword an If you publish a embedded-hal implementation to please use that keyword to let others more easily find your crate!


  • linux-embedded-hal. For the Raspberry Pi and other SBC that expose pins with embedded functionality (SPI, I2C, etc.)



ST Microelectronics

  • stm32f30x-hal. Check the f3 crate for examples that can be run on the STM32F3DISCOVERY.

Texas Instruments


These are (WIP) platform agnostic drivers that can be used with any of the above implementations to interface all sort of external devices like sensors and actuators. Feel free to send a PR adding yours to the list!

You may be able to find even more implementations by searching for the embedded-hal-driver keyword an If you publish a driver to please use that keyword to let others more easily find your crate!

  • motor-driver. Motor drivers like the L298N and the TB6612FNG
  • mpu9250. Accelerometer + gyroscope + magnetometer IMU
  • si7021. Humidity and temperature sensor


Licensed under either of

at your option.


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.

You can’t perform that action at this time.