功率计

use lager::LagerBox;

let lager = LagerBox::from_env()?;
let meter = lager.watt_meter("watt1");

pub struct WattReading {
    pub current: Option<f64>,     // amps, mean
    pub voltage: Option<f64>,     // volts, mean
    pub power: Option<f64>,       // watts, mean
    pub duration_s: Option<f64>,  // the window actually used
}

let watts = meter.power(0.5)?;

let r = meter.all(1.0)?;
println!("{:?} A, {:?} V, {:?} W", r.current, r.voltage, r.power);

let meter = lager.watt_meter("watt1");
let dut = lager.gpio("sleep_req");

dut.output_high()?;
std::thread::sleep(std::time::Duration::from_secs(2)); // let it settle

let sleeping = meter.all(5.0)?;
let amps = sleeping.current.expect("meter reports current");
assert!(amps < 50e-6, "sleep current {:.1} uA over budget", amps * 1e6);