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rp/pio: wrap PioPins from ref, like everything else

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also store peripheral refs instead of a raw pin/bank number, like
everything else.
This commit is contained in:
pennae 2023-05-03 08:46:08 +02:00
parent 4ccb2bc95a
commit 6ad58f428a
1 changed files with 13 additions and 18 deletions
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31
embassy-rp/src/pio.rs
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@ -6,13 +6,13 @@ use core::task::{Context, Poll};
use atomic_polyfill::{AtomicU32, AtomicU8};
use embassy_cortex_m::interrupt::{Interrupt, InterruptExt};
use embassy_hal_common::{Peripheral, PeripheralRef};
use embassy_hal_common::{into_ref, Peripheral, PeripheralRef};
use embassy_sync::waitqueue::AtomicWaker;
use pac::io::vals::Gpio0ctrlFuncsel;
use crate::dma::{Channel, Transfer, Word};
use crate::gpio::sealed::Pin as SealedPin;
use crate::gpio::{self, Drive, Pull, SlewRate};
use crate::gpio::{self, AnyPin, Drive, Pull, SlewRate};
use crate::pac::dma::vals::TreqSel;
use crate::pio::sealed::PioInstance as _;
use crate::{interrupt, pac, peripherals, RegExt};
@ -244,17 +244,17 @@ impl<'d, PIO: PioInstance> Drop for IrqFuture<PIO> {
}
}
pub struct Pin<PIO: PioInstance> {
pin_bank: u8,
pub struct Pin<'l, PIO: PioInstance> {
pin: PeripheralRef<'l, AnyPin>,
pio: PhantomData<PIO>,
}
impl<PIO: PioInstance> Pin<PIO> {
impl<'l, PIO: PioInstance> Pin<'l, PIO> {
/// Set the pin's drive strength.
#[inline]
pub fn set_drive_strength(&mut self, strength: Drive) {
unsafe {
self.pad_ctrl().modify(|w| {
self.pin.pad_ctrl().modify(|w| {
w.set_drive(match strength {
Drive::_2mA => pac::pads::vals::Drive::_2MA,
Drive::_4mA => pac::pads::vals::Drive::_4MA,
@ -269,7 +269,7 @@ impl<PIO: PioInstance> Pin<PIO> {
#[inline]
pub fn set_slew_rate(&mut self, slew_rate: SlewRate) {
unsafe {
self.pad_ctrl().modify(|w| {
self.pin.pad_ctrl().modify(|w| {
w.set_slewfast(slew_rate == SlewRate::Fast);
});
}
@ -279,7 +279,7 @@ impl<PIO: PioInstance> Pin<PIO> {
#[inline]
pub fn set_pull(&mut self, pull: Pull) {
unsafe {
self.pad_ctrl().modify(|w| {
self.pin.pad_ctrl().modify(|w| {
w.set_pue(pull == Pull::Up);
w.set_pde(pull == Pull::Down);
});
@ -290,7 +290,7 @@ impl<PIO: PioInstance> Pin<PIO> {
#[inline]
pub fn set_schmitt(&mut self, enable: bool) {
unsafe {
self.pad_ctrl().modify(|w| {
self.pin.pad_ctrl().modify(|w| {
w.set_schmitt(enable);
});
}
@ -308,13 +308,7 @@ impl<PIO: PioInstance> Pin<PIO> {
}
pub fn pin(&self) -> u8 {
self._pin()
}
}
impl<PIO: PioInstance> SealedPin for Pin<PIO> {
fn pin_bank(&self) -> u8 {
self.pin_bank
self.pin._pin()
}
}
@ -890,14 +884,15 @@ impl<'d, PIO: PioInstance> PioCommon<'d, PIO> {
/// Register a pin for PIO usage. Pins will be released from the PIO block
/// (i.e., have their `FUNCSEL` reset to `NULL`) when the [`PioCommon`] *and*
/// all [`PioStateMachine`]s for this block have been dropped.
pub fn make_pio_pin(&mut self, pin: impl PioPin) -> Pin<PIO> {
pub fn make_pio_pin(&mut self, pin: impl Peripheral<P = impl PioPin + 'd> + 'd) -> Pin<'d, PIO> {
into_ref!(pin);
unsafe {
pin.io().ctrl().write(|w| w.set_funcsel(PIO::FUNCSEL.0));
}
// we can be relaxed about this because we're &mut here and nothing is cached
PIO::state().used_pins.fetch_or(1 << pin.pin_bank(), Ordering::Relaxed);
Pin {
pin_bank: pin.pin_bank(),
pin: pin.into_ref().map_into(),
pio: PhantomData::default(),
}
}