Comments (1)
It's not clear how to use human time (milliseconds) with the trait CountDown
. Most embedded-hal implementations use clock as a time reference, hence Time = Herz
. Because external trait cannot be implemented for external types, something like the following is not possible:
mod my_device {
pub struct MyDevice<T>(T,)
impl<T, U> MyDevice<T>
where
T: hal::timer::CountDown<Time=U>
U: From<Milliseconds>
{
pub fn new(timer: T) -> Self {
let mut dev = Self(timer);
dev.start(Milliseconds(3));
(dev)
}
pub fn wait(&mut self) -> Result<(), Void> {
(self.timer.wait())
}
}
pub struct Milliseconds(u8);
}
// ...
fn main() {}
// Not possible
impl From<my_device::Milliseconds> for hal::Herz {
fn from(duration: my_device::Milliseconds) -> Self {
Herz(duration.0 * 1000)
}
}
Adding a conversion trait could be a solution however that doesn't sound really like a good one.
Ref: rust-embedded/embedded-hal#129
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