ev3dev_lang_rust/
power_supply.rs

1//! An interface to read data from the system’s power_supply class.
2//! Uses the built-in legoev3-battery if none is specified.
3
4use std::{fs, path::Path};
5
6use crate::driver::DRIVER_PATH;
7use crate::utils::OrErr;
8use crate::{Attribute, Device, Driver, Ev3Error, Ev3Result};
9
10/// An interface to read data from the system’s power_supply class.
11/// Uses the built-in legoev3-battery if none is specified.
12#[derive(Debug, Clone, Device)]
13pub struct PowerSupply {
14    driver: Driver,
15}
16
17impl PowerSupply {
18    /// Create a new instance of `PowerSupply`.
19    pub fn new() -> Ev3Result<PowerSupply> {
20        let paths = fs::read_dir(Path::new(DRIVER_PATH).join("power_supply"))?;
21
22        for path in paths {
23            let file_name = path?.file_name();
24            let name = file_name.to_str().or_err()?;
25
26            if name.contains("ev3-battery") {
27                return Ok(PowerSupply {
28                    driver: Driver::new("power_supply", name),
29                });
30            }
31        }
32
33        Err(Ev3Error::NotConnected {
34            device: "power_supply".to_owned(),
35            port: None,
36        })
37    }
38
39    /// Returns the battery current in microamps
40    pub fn get_current_now(&self) -> Ev3Result<i32> {
41        self.get_attribute("current_now").get()
42    }
43
44    /// Always returns System.
45    pub fn get_scope(&self) -> Ev3Result<String> {
46        self.get_attribute("zscope").get()
47    }
48
49    /// Returns Unknown or Li-ion depending on if the rechargeable battery is present.
50    pub fn get_technology(&self) -> Ev3Result<String> {
51        self.get_attribute("technology").get()
52    }
53
54    /// Always returns Battery.
55    pub fn get_type(&self) -> Ev3Result<String> {
56        self.get_attribute("type").get()
57    }
58
59    /// Returns the nominal “full” battery voltage. The value returned depends on technology.
60    pub fn get_voltage_max_design(&self) -> Ev3Result<i32> {
61        self.get_attribute("voltage_max_design").get()
62    }
63
64    /// Returns the nominal “empty” battery voltage. The value returned depends on technology.
65    pub fn get_voltage_min_design(&self) -> Ev3Result<i32> {
66        self.get_attribute("voltage_min_design").get()
67    }
68
69    /// Returns the battery voltage in microvolts.
70    pub fn get_voltage_now(&self) -> Ev3Result<i32> {
71        self.get_attribute("voltage_now").get()
72    }
73}
ev3dev_lang_rust/power_supply.rs

ev3dev_lang_rust/
power_supply.rs
