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//! This module fits the requirement of `rtic-monotonic`, but has uses beyond that.
use core::{
self,
cmp::{Ord, Ordering, PartialOrd},
ops::{Add, Sub},
time::Duration,
};
/// A time instant, from the start of a timer, for use with `rtic-monotonic`. Currently only
/// has microsecond precision.
#[derive(Eq, PartialEq, PartialOrd, Copy, Clone, Default)]
pub struct Instant {
/// Total count, in microseconds.
/// todo: Do you need ns resolution?
// pub count_us: i64, // todo: u64 or i64? x128?
pub count_ns: i64, // todo: u64 or i64? x128?
}
impl Instant {
/// The time, in seconds.
pub fn as_secs(&self) -> f32 {
// self.count_us as f32 / 1_000_000.
self.count_ns as f32 / 1_000_000_000.
}
/// The time, in milliseconds.
pub fn as_ms(&self) -> f32 {
// self.count_us as f32 / 1_000.
self.count_ns as f32 / 1_000_000.
}
/// The time, in microseconds
pub fn as_us(&self) -> f32 {
// self.count_us as f32
self.count_ns as f32 / 1_000.
}
/// The time, in nanoseconds
pub fn as_ns(&self) -> f32 {
self.count_ns as f32
}
}
impl Ord for Instant {
fn cmp(&self, other: &Self) -> Ordering {
// self.count_us.cmp(&other.count_us)
self.count_ns.cmp(&other.count_ns)
}
}
impl Add<Duration> for Instant {
type Output = Self;
fn add(self, rhs: Duration) -> Self::Output {
Self {
// count_us: self.count_us + rhs.as_micros() as i64,
count_ns: self.count_ns + rhs.as_nanos() as i64,
}
}
}
impl Sub<Duration> for Instant {
type Output = Self;
fn sub(self, rhs: Duration) -> Self::Output {
Self {
// count_us: self.count_us - rhs.as_micros() as i64,
count_ns: self.count_ns - rhs.as_nanos() as i64,
}
}
}
impl Sub<Self> for Instant {
type Output = Duration;
fn sub(self, rhs: Self) -> Self::Output {
// todo: Handle negative overflow!
// Duration::from_micros((self.count_us - rhs.count_us) as u64)
Duration::from_nanos((self.count_ns - rhs.count_ns) as u64)
}
}