Crate atm90e32_async 

Async no_std driver for the Microchip / Atmel ATM90E32 3-phase SPI power metering IC.

This crate provides a lightweight, portable driver built on top of embedded-hal-async. It has no dependency on any specific async runtime and works with Embassy, RTIC2, or any other executor that implements SpiDevice and DelayNs.

Architecture

The crate follows a sans-I/O split:

• proto — pure functions: byte-frame building, response parsing, raw → engineering unit conversions, and the post-reset init sequence expressed as data. No I/O, no async — 100% host-testable.
• driver — async transport: owns the SPI device and delay, invokes the proto helpers, maps errors, and sequences the init writes.

Features

• defmt (optional) — derives defmt::Format on public types for ergonomic logging with the defmt ecosystem.

Quick start

let mut meter = Atm90e32::new(spi, delay);
meter.probe().await?;

let cfg = Config::default()
    .with_voltage_gain([39470, 39470, 39470])
    .with_current_gain([65327, 65327, 65327])
    .with_line_freq(LineFreq::Hz50)
    .with_pga_gain(PgaGain::X2);
meter.init(&cfg).await?;

loop {
    let r = meter.read_all_phases().await?;
    // use r.voltage, r.current, r.power, r.reactive, r.pf, r.frequency
}

What’s implemented

The driver covers the measurement set used by production JetHome PM380 meters: RMS voltage/current, active and reactive power, power factor, mains frequency, phase angle, chip temperature, and phase status (overcurrent, overvoltage, voltage sag, phase loss) on all three phases. Not yet implemented (contributions welcome): energy accumulation, apparent power, harmonic analysis, zero-crossing interrupts, and ATM90E36 family support.

License

Dual-licensed under either Apache-2.0 or GPL-2.0-or-later at the user’s option.

Re-exports

pub use crate::config::Config;

pub use crate::config::LineFreq;

pub use crate::config::PgaGain;

pub use crate::driver::Atm90e32;

pub use crate::driver::Phase;

pub use crate::error::Error;

pub use crate::error::InitStage;

pub use crate::readings::PhaseReadings;

pub use crate::status::PhaseStatus;

Modules

config

Initialization configuration for the ATM90E32.

driver

Async driver struct for the ATM90E32.

error

Error types returned by the driver.

proto

Sans-I/O helpers — pure functions with no SPI, no async, no delays.

readings

Measurement result types.

registers

ATM90E32 register address map.

status

Phase and frequency status decoded from the ATM90E32 EMM state registers.