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Separate OpenDrain pin to a new type

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This commit is contained in:
Thales Fragoso 2021-06-25 17:22:51 -03:00
parent efb3b3a0a8
commit a3f0aa02a4
1 changed files with 88 additions and 26 deletions
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112
embassy-stm32/src/gpio.rs
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@ -18,7 +18,19 @@ pub enum Pull {
Down,
}
/// Pull setting for an input.
impl From<Pull> for vals::Pupdr {
fn from(pull: Pull) -> Self {
use Pull::*;
match pull {
None => vals::Pupdr::FLOATING,
Up => vals::Pupdr::PULLUP,
Down => vals::Pupdr::PULLDOWN,
}
}
}
/// Speed settings
#[derive(Debug)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub enum Speed {
@ -56,12 +68,7 @@ impl<'d, T: Pin> Input<'d, T> {
cortex_m::interrupt::free(|_| unsafe {
let r = pin.block();
let n = pin.pin() as usize;
let val = match pull {
Pull::None => vals::Pupdr::FLOATING,
Pull::Up => vals::Pupdr::PULLUP,
Pull::Down => vals::Pupdr::PULLDOWN,
};
r.pupdr().modify(|w| w.set_pupdr(n, val));
r.pupdr().modify(|w| w.set_pupdr(n, pull.into()));
r.otyper().modify(|w| w.set_ot(n, vals::Ot::PUSHPULL));
r.moder().modify(|w| w.set_moder(n, vals::Moder::INPUT));
});
@ -111,12 +118,7 @@ pub struct Output<'d, T: Pin> {
}
impl<'d, T: Pin> Output<'d, T> {
pub fn new(
pin: impl Unborrow<Target = T> + 'd,
initial_output: Level,
speed: Speed,
open_drain: bool,
) -> Self {
pub fn new(pin: impl Unborrow<Target = T> + 'd, initial_output: Level, speed: Speed) -> Self {
unborrow!(pin);
match initial_output {
@ -129,9 +131,6 @@ impl<'d, T: Pin> Output<'d, T> {
let n = pin.pin() as usize;
r.pupdr().modify(|w| w.set_pupdr(n, vals::Pupdr::FLOATING));
r.moder().modify(|w| w.set_moder(n, vals::Moder::OUTPUT));
if open_drain {
r.otyper().modify(|w| w.set_ot(n, vals::Ot::OPENDRAIN));
}
pin.set_speed(speed);
});
@ -149,8 +148,6 @@ impl<'d, T: Pin> Drop for Output<'d, T> {
let n = self.pin.pin() as usize;
r.pupdr().modify(|w| w.set_pupdr(n, vals::Pupdr::FLOATING));
r.moder().modify(|w| w.set_moder(n, vals::Moder::INPUT));
r.otyper().modify(|w| w.set_ot(n, vals::Ot::PUSHPULL));
self.pin.set_speed(Speed::LowSpeed);
});
}
}
@ -184,19 +181,84 @@ impl<'d, T: Pin> StatefulOutputPin for Output<'d, T> {
}
}
impl<'d, T: Pin> InputPin for Output<'d, T> {
type Error = Infallible;
impl<'d, T: Pin> toggleable::Default for Output<'d, T> {}
fn is_high(&self) -> Result<bool, Self::Error> {
self.is_set_high()
/// GPIO output open-drain driver.
pub struct OutputOpenDrain<'d, T: Pin> {
pub(crate) pin: T,
phantom: PhantomData<&'d mut T>,
}
impl<'d, T: Pin> OutputOpenDrain<'d, T> {
pub fn new(
pin: impl Unborrow<Target = T> + 'd,
initial_output: Level,
speed: Speed,
pull: Pull,
) -> Self {
unborrow!(pin);
match initial_output {
Level::High => pin.set_high(),
Level::Low => pin.set_low(),
}
fn is_low(&self) -> Result<bool, Self::Error> {
self.is_set_low()
cortex_m::interrupt::free(|_| unsafe {
let r = pin.block();
let n = pin.pin() as usize;
r.pupdr().modify(|w| w.set_pupdr(n, pull.into()));
r.moder().modify(|w| w.set_moder(n, vals::Moder::OUTPUT));
r.otyper().modify(|w| w.set_ot(n, vals::Ot::OPENDRAIN));
pin.set_speed(speed);
});
Self {
pin,
phantom: PhantomData,
}
}
}
impl<'d, T: Pin> toggleable::Default for Output<'d, T> {}
impl<'d, T: Pin> Drop for OutputOpenDrain<'d, T> {
fn drop(&mut self) {
cortex_m::interrupt::free(|_| unsafe {
let r = self.pin.block();
let n = self.pin.pin() as usize;
r.pupdr().modify(|w| w.set_pupdr(n, vals::Pupdr::FLOATING));
r.moder().modify(|w| w.set_moder(n, vals::Moder::INPUT));
});
}
}
impl<'d, T: Pin> OutputPin for OutputOpenDrain<'d, T> {
type Error = Infallible;
/// Set the output as high.
fn set_high(&mut self) -> Result<(), Self::Error> {
self.pin.set_high();
Ok(())
}
/// Set the output as low.
fn set_low(&mut self) -> Result<(), Self::Error> {
self.pin.set_low();
Ok(())
}
}
impl<'d, T: Pin> InputPin for Input<'d, T> {
type Error = Infallible;
fn is_high(&self) -> Result<bool, Self::Error> {
self.is_low().map(|v| !v)
}
fn is_low(&self) -> Result<bool, Self::Error> {
// NOTE(safety) Atomic read
let state = unsafe { self.pin.block().idr().read().idr(self.pin.pin() as usize) };
Ok(state == vals::Idr::LOW)
}
}
pub(crate) mod sealed {
use super::*;