embassy/embassy-time/src/delay.rs

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use super::{Duration, Instant};
/// Blocks for at least `duration`.
pub fn block_for(duration: Duration) {
let expires_at = Instant::now() + duration;
while Instant::now() < expires_at {}
}
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/// Type implementing async delays and blocking `embedded-hal` delays.
///
/// The delays are implemented in a "best-effort" way, meaning that the cpu will block for at least
/// the amount provided, but accuracy can be affected by many factors, including interrupt usage.
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/// Make sure to use a suitable tick rate for your use case. The tick rate is defined by the currently
/// active driver.
pub struct Delay;
#[cfg(feature = "unstable-traits")]
mod eh1 {
use super::*;
impl embedded_hal_1::delay::blocking::DelayUs for Delay {
type Error = core::convert::Infallible;
fn delay_us(&mut self, us: u32) -> Result<(), Self::Error> {
Ok(block_for(Duration::from_micros(us as u64)))
}
fn delay_ms(&mut self, ms: u32) -> Result<(), Self::Error> {
Ok(block_for(Duration::from_millis(ms as u64)))
}
}
}
cfg_if::cfg_if! {
if #[cfg(all(feature = "unstable-traits", feature = "nightly"))] {
use crate::Timer;
use core::future::Future;
use futures_util::FutureExt;
impl embedded_hal_async::delay::DelayUs for Delay {
type Error = core::convert::Infallible;
type DelayUsFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
fn delay_us(&mut self, micros: u32) -> Self::DelayUsFuture<'_> {
Timer::after(Duration::from_micros(micros as _)).map(Ok)
}
type DelayMsFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a where Self: 'a;
fn delay_ms(&mut self, millis: u32) -> Self::DelayMsFuture<'_> {
Timer::after(Duration::from_millis(millis as _)).map(Ok)
}
}
}
}
mod eh02 {
use embedded_hal_02::blocking::delay::{DelayMs, DelayUs};
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use super::*;
impl DelayMs<u8> for Delay {
fn delay_ms(&mut self, ms: u8) {
block_for(Duration::from_millis(ms as u64))
}
}
impl DelayMs<u16> for Delay {
fn delay_ms(&mut self, ms: u16) {
block_for(Duration::from_millis(ms as u64))
}
}
impl DelayMs<u32> for Delay {
fn delay_ms(&mut self, ms: u32) {
block_for(Duration::from_millis(ms as u64))
}
}
impl DelayUs<u8> for Delay {
fn delay_us(&mut self, us: u8) {
block_for(Duration::from_micros(us as u64))
}
}
impl DelayUs<u16> for Delay {
fn delay_us(&mut self, us: u16) {
block_for(Duration::from_micros(us as u64))
}
}
impl DelayUs<u32> for Delay {
fn delay_us(&mut self, us: u32) {
block_for(Duration::from_micros(us as u64))
}
}
}