pmbus-adapter

Async, no_std PMBus 1.4 protocol adapter built on top of embedded-hal-async I2C and smbus-adapter.

Features

• Full PMBus 1.4 command set — typed methods for every standard command (voltage, current, temperature, fan, fault limits, status registers, etc.).
• Data format codecs — Linear11, ULinear16, and DirectCoefficients encode/decode helpers.
• VOUT_MODE parsing — decode and encode the VOUT_MODE register (ULinear16, VID, Direct, IEEE half).
• Status bitflags — strongly-typed StatusByte, StatusWord, StatusVout, StatusIout, and more.
• no_std compatible — zero heap allocations, suitable for bare-metal and RTOS targets.

Usage

Add the crate to your Cargo.toml:

[dependencies]
pmbus-adapter = "0.1"

use pmbus_adapter::{PmbusAdaptor, Linear11, VoutMode};
use smbus_adapter::SmbusAdaptor;

async fn example<B: embedded_hal_async::i2c::I2c>(bus: B) {
    let smbus = SmbusAdaptor::new(bus);
    let mut pmbus = PmbusAdaptor::new(smbus);

    let addr = 0x40;

    // Read output voltage (raw word), decode with VOUT_MODE exponent
    let mode = pmbus.get_vout_mode(addr).await.unwrap();
    let raw = pmbus.read_vout(addr).await.unwrap();

    // Read input current as LINEAR11
    let raw_iin = pmbus.read_iin(addr).await.unwrap();
    let iin = Linear11::from_raw(raw_iin).to_f32();
}

Minimum Supported Rust Version

This crate requires Rust 1.85.1 or later (edition 2024).

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.