[][src]Trait bl602_hal::prelude::_embedded_hal_timer_CountDown

pub trait _embedded_hal_timer_CountDown {
    type Error;
    type Time;
    fn try_start<T>(&mut self, count: T) -> Result<(), Self::Error>
    where
        T: Into<Self::Time>
;
fn try_wait(&mut self) -> Result<(), Error<Self::Error>>; }

A count down timer

Contract

Note that the implementer doesn't necessarily have to be a downcounting timer; it could also be an upcounting timer as long as the above contract is upheld.

Examples

You can use this timer to create delays

extern crate embedded_hal as hal;
#[macro_use(block)]
extern crate nb;

use hal::prelude::*;

fn main() {
    let mut led: Led = {
        // ..
    };
    let mut timer: Timer6 = {
        // ..
    };

    Led.on();
    timer.try_start(1.s()).unwrap();
    block!(timer.try_wait()); // blocks for 1 second
    Led.off();
}

Associated Types

type Error

An enumeration of CountDown errors.

For infallible implementations, will be Infallible

type Time

The unit of time used by this timer

Loading content...

Required methods

fn try_start<T>(&mut self, count: T) -> Result<(), Self::Error> where
    T: Into<Self::Time>, 

Starts a new count down

fn try_wait(&mut self) -> Result<(), Error<Self::Error>>

Non-blockingly "waits" until the count down finishes

Contract

  • If Self: Periodic, the timer will start a new count down right after the last one finishes.
  • Otherwise the behavior of calling try_wait after the last call returned Ok is UNSPECIFIED. Implementers are suggested to panic on this scenario to signal a programmer error.
Loading content...

Implementors

Loading content...