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stm32: Allow for open drain configuration for output pin

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This commit is contained in:
Thales Fragoso 2021-06-23 19:22:53 -03:00
parent e1880a19df
commit efb3b3a0a8
1 changed files with 56 additions and 1 deletions
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57
embassy-stm32/src/gpio.rs
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@ -18,6 +18,31 @@ pub enum Pull {
Down,
}
/// Pull setting for an input.
#[derive(Debug)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub enum Speed {
LowSpeed,
MediumSpeed,
#[cfg(not(syscfg_f0))]
HighSpeed,
VeryHighSpeed,
}
impl From<Speed> for vals::Ospeedr {
fn from(speed: Speed) -> Self {
use Speed::*;
match speed {
LowSpeed => vals::Ospeedr::LOWSPEED,
MediumSpeed => vals::Ospeedr::MEDIUMSPEED,
#[cfg(not(syscfg_f0))]
HighSpeed => vals::Ospeedr::HIGHSPEED,
VeryHighSpeed => vals::Ospeedr::VERYHIGHSPEED,
}
}
}
/// GPIO input driver.
pub struct Input<'d, T: Pin> {
pub(crate) pin: T,
@ -86,7 +111,12 @@ 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) -> Self {
pub fn new(
pin: impl Unborrow<Target = T> + 'd,
initial_output: Level,
speed: Speed,
open_drain: bool,
) -> Self {
unborrow!(pin);
match initial_output {
@ -99,6 +129,10 @@ 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);
});
Self {
@ -115,6 +149,8 @@ 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);
});
}
}
@ -148,6 +184,18 @@ impl<'d, T: Pin> StatefulOutputPin for Output<'d, T> {
}
}
impl<'d, T: Pin> InputPin for Output<'d, T> {
type Error = Infallible;
fn is_high(&self) -> Result<bool, Self::Error> {
self.is_set_high()
}
fn is_low(&self) -> Result<bool, Self::Error> {
self.is_set_low()
}
}
impl<'d, T: Pin> toggleable::Default for Output<'d, T> {}
pub(crate) mod sealed {
@ -206,6 +254,13 @@ pub(crate) mod sealed {
.moder()
.modify(|w| w.set_moder(pin, vals::Moder::ANALOG));
}
unsafe fn set_speed(&self, speed: Speed) {
let pin = self._pin() as usize;
self.block()
.ospeedr()
.modify(|w| w.set_ospeedr(pin, speed.into()));
}
}
pub trait OptionalPin {}