This is a very simple Rust sample for ESP32 family boards based on ESP-IDF.

The LED will blink or L チカ on ESP32 (Xtensa) and ESP32-C3 (RISC-V) series development boards.

The Rust has two environments. One is std environment. In most cases, the program runs on OS and can get its resource or functions based on its manner. The Other is a bare metal or no_std environment. In this case, the program controls all functions through registers on the chip.

The latest Rust supports both std and non_std environments for ESP32 family. The std environment is based on its native development kit or ESP-IDF. Thus, a large storage space, a few gigabytes, is required for each project.

This sample program runs on std environment.

These boards are my original design, and please change the pin number depending on your configurations.

Confirm building target in .cargo/config.toml before compiling

$ cargo build # For ESP32-C3

# For ESP32
$ cargo +esp build
or
$ rustup override set esp
$ cargo build

The port connected to the ESP32 or ESP32-C3 is found automatically, and you will be asked.

$ cargo espflash --monitor

The esp-idf-hal or ESP32 hardware abstraction layer significantly changes between 0.38.1 and 0.39.3.

To set the LED pin in the 0.38.1

let pin = peripherals.pins.gpio2;
let mut led = pin.into_output()?;

Since 0.39.3, PinDriver is required.

let pin = peripherals.pins.gpio2;
let mut led = PinDriver::output(pin)?;