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Removed unsafe from uarte

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The constructors themselves are not strictly unsafe. Interactions with DMA can be generally unsafe if a future is dropped, but that's a separate issue. It is important that we use the `unsafe` keyword diligently as it can lead to confusion otherwise.
This commit is contained in:
huntc 2021-12-01 09:14:24 +11:00
parent e36e36dab6
commit 469852c667
4 changed files with 32 additions and 41 deletions
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29
embassy-nrf/src/buffered_uarte.rs
View file

@ -65,8 +65,7 @@ pub struct BufferedUarte<'d, U: UarteInstance, T: TimerInstance> {
impl<'d, U: UarteInstance, T: TimerInstance> Unpin for BufferedUarte<'d, U, T> {}
impl<'d, U: UarteInstance, T: TimerInstance> BufferedUarte<'d, U, T> {
/// unsafe: may not leak self or futures
pub unsafe fn new(
pub fn new(
state: &'d mut State<'d, U, T>,
_uarte: impl Unborrow<Target = U> + 'd,
timer: impl Unborrow<Target = T> + 'd,
@ -160,20 +159,22 @@ impl<'d, U: UarteInstance, T: TimerInstance> BufferedUarte<'d, U, T> {
ppi_ch2.enable();
Self {
inner: PeripheralMutex::new_unchecked(irq, &mut state.0, move || StateInner {
phantom: PhantomData,
timer,
_ppi_ch1: ppi_ch1,
_ppi_ch2: ppi_ch2,
inner: unsafe {
PeripheralMutex::new_unchecked(irq, &mut state.0, move || StateInner {
phantom: PhantomData,
timer,
_ppi_ch1: ppi_ch1,
_ppi_ch2: ppi_ch2,
rx: RingBuffer::new(rx_buffer),
rx_state: RxState::Idle,
rx_waker: WakerRegistration::new(),
rx: RingBuffer::new(rx_buffer),
rx_state: RxState::Idle,
rx_waker: WakerRegistration::new(),
tx: RingBuffer::new(tx_buffer),
tx_state: TxState::Idle,
tx_waker: WakerRegistration::new(),
}),
tx: RingBuffer::new(tx_buffer),
tx_state: TxState::Idle,
tx_waker: WakerRegistration::new(),
})
},
}
}

9
embassy-nrf/src/uarte.rs
View file

@ -48,14 +48,7 @@ pub struct Uarte<'d, T: Instance> {
impl<'d, T: Instance> Uarte<'d, T> {
/// Creates the interface to a UARTE instance.
/// Sets the baud rate, parity and assigns the pins to the UARTE peripheral.
///
/// # Safety
///
/// The returned API is safe unless you use `mem::forget` (or similar safe mechanisms)
/// on stack allocated buffers which which have been passed to [`send()`](Uarte::send)
/// or [`receive`](Uarte::receive).
#[allow(unused_unsafe)]
pub unsafe fn new(
pub fn new(
_uarte: impl Unborrow<Target = T> + 'd,
irq: impl Unborrow<Target = T::Interrupt> + 'd,
rxd: impl Unborrow<Target = impl GpioPin> + 'd,

32
examples/nrf/src/bin/buffered_uart.rs
View file

@ -24,23 +24,21 @@ async fn main(_spawner: Spawner, p: Peripherals) {
let irq = interrupt::take!(UARTE0_UART0);
let mut state = State::new();
let u = unsafe {
BufferedUarte::new(
&mut state,
p.UARTE0,
p.TIMER0,
p.PPI_CH0,
p.PPI_CH1,
irq,
p.P0_08,
p.P0_06,
NoPin,
NoPin,
config,
&mut rx_buffer,
&mut tx_buffer,
)
};
let u = BufferedUarte::new(
&mut state,
p.UARTE0,
p.TIMER0,
p.PPI_CH0,
p.PPI_CH1,
irq,
p.P0_08,
p.P0_06,
NoPin,
NoPin,
config,
&mut rx_buffer,
&mut tx_buffer,
);
pin_mut!(u);
info!("uarte initialized!");

3
examples/nrf/src/bin/uart.rs
View file

@ -18,8 +18,7 @@ async fn main(_spawner: Spawner, p: Peripherals) {
config.baudrate = uarte::Baudrate::BAUD115200;
let irq = interrupt::take!(UARTE0_UART0);
let mut uart =
unsafe { uarte::Uarte::new(p.UARTE0, irq, p.P0_08, p.P0_06, NoPin, NoPin, config) };
let mut uart = uarte::Uarte::new(p.UARTE0, irq, p.P0_08, p.P0_06, NoPin, NoPin, config);
info!("uarte initialized!");