DS3231 Real-Time Clock Driver

A platform-agnostic Rust driver for the DS3231 Real-Time Clock, built on the embedded-hal ecosystem. The DS3231 is a low-cost, extremely accurate I²C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO).

• Both blocking and async I²C operation support
• Full register access (time/date, alarms, control, status)
• Optional logging support via log or defmt
• No unsafe code
• Comprehensive error handling

Usage

Add this to your Cargo.toml:

[dependencies]
ds3231 = "0.3.0"

Blocking Example

use ds3231::{DS3231, Config, TimeRepresentation, SquareWaveFrequency, InterruptControl, Oscillator};

// Create configuration
let config = Config {
    time_representation: TimeRepresentation::TwentyFourHour,
    square_wave_frequency: SquareWaveFrequency::Hz1,
    interrupt_control: InterruptControl::SquareWave,
    battery_backed_square_wave: false,
    oscillator_enable: Oscillator::Enabled,
};

// Initialize device with I2C
let mut rtc = DS3231::new(i2c, 0x68);

// Configure the device
rtc.configure(&config)?;

// Get current date/time
let datetime = rtc.datetime()?;

Async Example

Enable the async feature in your Cargo.toml and use with async/await:

use ds3231::asynch::DS3231;

// Initialize device
let mut rtc = DS3231::new(i2c, 0x68);

// Configure asynchronously
rtc.configure(&config).await?;

// Get current date/time asynchronously
let datetime = rtc.datetime().await?;

Features

The crate can be compiled with the following features:

• async: Enables async I²C support
• log: Enables logging via the log crate
• defmt: Enables logging via the defmt crate
• temperature_f32 - Enables temperature reading as f32

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.