Trait embassy_stm32::Peripheral
source · pub trait Peripheral: Sized {
type P;
// Required method
unsafe fn clone_unchecked(&self) -> Self::P;
// Provided method
fn into_ref<'a>(self) -> PeripheralRef<'a, Self::P>
where Self: 'a { ... }
}Expand description
Trait for any type that can be used as a peripheral of type P.
This is used in driver constructors, to allow passing either owned peripherals (e.g. TWISPI0),
or borrowed peripherals (e.g. &mut TWISPI0).
For example, if you have a driver with a constructor like this:
impl<'d, T: Instance> Twim<'d, T> {
pub fn new(
twim: impl Peripheral<P = T> + 'd,
irq: impl Peripheral<P = T::Interrupt> + 'd,
sda: impl Peripheral<P = impl GpioPin> + 'd,
scl: impl Peripheral<P = impl GpioPin> + 'd,
config: Config,
) -> Self { .. }
}You may call it with owned peripherals, which yields an instance that can live forever ('static):
let mut twi: Twim<'static, ...> = Twim::new(p.TWISPI0, irq, p.P0_03, p.P0_04, config);Or you may call it with borrowed peripherals, which yields an instance that can only live for as long as the borrows last:
let mut twi: Twim<'_, ...> = Twim::new(&mut p.TWISPI0, &mut irq, &mut p.P0_03, &mut p.P0_04, config);Implementation details, for HAL authors
When writing a HAL, the intended way to use this trait is to take impl Peripheral<P = ..> in
the HAL’s public API (such as driver constructors), calling .into_ref() to obtain a PeripheralRef,
and storing that in the driver struct.
.into_ref() on an owned T yields a PeripheralRef<'static, T>.
.into_ref() on an &'a mut T yields a PeripheralRef<'a, T>.
Required Associated Types§
Required Methods§
sourceunsafe fn clone_unchecked(&self) -> Self::P
unsafe fn clone_unchecked(&self) -> Self::P
Unsafely clone (duplicate) a peripheral singleton.
Safety
This returns an owned clone of the peripheral. You must manually ensure
only one copy of the peripheral is in use at a time. For example, don’t
create two SPI drivers on SPI1, because they will “fight” each other.
You should strongly prefer using into_ref() instead. It returns a
PeripheralRef, which allows the borrow checker to enforce this at compile time.
Provided Methods§
sourcefn into_ref<'a>(self) -> PeripheralRef<'a, Self::P>where
Self: 'a,
fn into_ref<'a>(self) -> PeripheralRef<'a, Self::P>where
Self: 'a,
Convert a value into a PeripheralRef.
When called on an owned T, yields a PeripheralRef<'static, T>.
When called on an &'a mut T, yields a PeripheralRef<'a, T>.
