README.md

Safe Rust wrappers for the drivers in the ESP IDF SDK

Highlights

• Implements the traits of embedded-hal V0.2 as well as those of V1.0 - both blocking and async
• Supports almost all ESP IDF drivers: GPIO, SPI, I2C, TIMER, PWM, I2S, UART, etc.
• Blocking and async mode for each driver (async support in progress)
• Re-exports esp-idf-sys as esp_idf_hal::sys

You might want to also check out the ESP IDF Services wrappers, and the raw bindings to ESP IDF in the esp-idf-sys crate!

(For baremetal Rust ESP projects please check esp-hal.)

Build Prerequisites

Follow the Prerequisites section in the esp-idf-template crate.

Examples

The examples could be built and flashed conveniently with cargo-espflash. To run e.g. the ledc_simple on an e.g. ESP32-C3: (Swap the Rust target and example name with the target corresponding for your ESP32 MCU and with the example you would like to build)

with cargo-espflash V2+:

$ ESP_IDF_VERSION=release/v4.4 cargo espflash flash --target riscv32imc-esp-espidf --example ledc_simple --monitor

with older cargo-espflash:

$ ESP_IDF_VERSION=release/v4.4 cargo espflash --target riscv32imc-esp-espidf --example ledc_simple --monitor /dev/ttyUSB0

In order to run the examples on other chips you will most likely need to adapt at least the used pins.

Setting up a "Hello, world!" binary crate with ESP IDF

Use the esp-idf-template project. Everything would be arranged and built for you automatically - no need to manually clone the ESP IDF repository.

More information

For more information, check out:

• The Rust on ESP Book
• The ESP Embedded Training
• The esp-idf-template project
• The embedded-hal project
• The esp-idf-svc project
• The embedded-svc project
• The esp-idf-sys project
• The Rust for Xtensa toolchain
• The Rust-with-STD demo project

Hardware Notes

Each chip has a number of GPIO pins which are generally used by the SPI0 and SPI1 peripherals in order to connect external PSRAM and/or SPI Flash memory. The datasheets explicitly state that these are not recommended for use, however this crate includes them anyways for completeness.

Please refer to the table below to determine the pins which are not recommended for use for your chip.

Chip	GPIOs
ESP32	6 - 11, 16 - 17
ESP32-C2	12 - 17
ESP32-C3	12 - 17
ESP32-C6	24 - 30
ESP32-H2	15 - 21
ESP32-S2	26 - 32
ESP32-S3	26 - 32, 33 - 37*

* When using Octal Flash and/or Octal PSRAM