电子负载

use lager::{EloadMode, LagerBox};

let lager = LagerBox::from_env()?;
let load = lager.eload("eload1");

pub enum EloadMode { Cc, Cv, Cr, Cp }

pub struct EloadState {
    pub mode: Option<String>,              // "CC" / "CV" / "CR" / "CW"
    pub input_enabled: Option<bool>,
    pub measured_voltage: Option<f64>,     // V
    pub measured_current: Option<f64>,     // A
    pub measured_power: Option<f64>,       // W
    pub current_setting: Option<f64>,      // A, in CC mode
    pub voltage_setting: Option<f64>,      // V, in CV mode
    pub resistance_setting: Option<f64>,   // ohms, in CR mode
    pub power_setting: Option<f64>,        // W, in constant-power mode
    pub extra: Map<String, Value>,         // any other field the box sends
}

load.set(EloadMode::Cc, 0.5)?;   // draw 500 mA

use lager::{EloadMode, LagerBox};

let lager = LagerBox::from_env()?;
let supply = lager.supply("supply1");
let load = lager.eload("eload1");

supply.set_voltage(5.0)?;
supply.set_current(2.0)?;
supply.enable()?;

for amps in [0.1_f64, 0.5, 1.0, 1.5] {
    load.set(EloadMode::Cc, amps)?;
    std::thread::sleep(std::time::Duration::from_millis(300));

    let s = load.state()?;
    let v = s.measured_voltage.unwrap_or(0.0);
    assert!(v > 4.75, "rail sagged to {v:.3} V at {amps} A");
    println!("{amps:>4.1} A -> {v:.3} V");
}

load.set(EloadMode::Cc, 0.0)?;
load.disable()?;
supply.disable()?;