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Delaying a Task
xoviat edited this page Mar 28, 2021
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1 revision
In an embedded program, delaying a task is one of the most common actions taken. In an event loop, delays will need to be inserted to ensure that other tasks have a chance to run before the next iteration of the loop is called, if no other I/O is performed. Embassy provides an abstraction to delay the current task for a specified interval of time.
Timing is serviced by the embassy::time::Timer
struct, which provides two timing methods.
Timer::at
creates a future that completes at the specified Instant
, relative to the system boot time.
Timer::after
creates a future that completes after the specified Duration
, relative to when the future was created.
An example of a delay is provided as follows:
use embassy::executor::{task, Executor};
use embassy::time::{Duration, Timer};
#[task]
/// Task that ticks periodically
async fn tick_periodic() -> ! {
loop {
rprintln!("tick!");
// async sleep primitive, suspends the task for 500ms.
Timer::after(Duration::from_millis(500)).await;
}
}