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Split_ref with shortened lifetime. When borrowed skip drop on rx and tx

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This commit is contained in:
Kenneth Knudsen 2024-11-06 10:52:03 +01:00
parent aa453caa79
commit 72109a7bda
1 changed files with 52 additions and 26 deletions
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32
embassy-stm32/src/usart/buffered.rs
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@ -157,6 +157,7 @@ pub struct BufferedUartTx<'d> {
tx: Option<PeripheralRef<'d, AnyPin>>,
cts: Option<PeripheralRef<'d, AnyPin>>,
de: Option<PeripheralRef<'d, AnyPin>>,
is_borrowed: bool,
}
/// Rx-only buffered UART
@ -168,6 +169,7 @@ pub struct BufferedUartRx<'d> {
kernel_clock: Hertz,
rx: Option<PeripheralRef<'d, AnyPin>>,
rts: Option<PeripheralRef<'d, AnyPin>>,
is_borrowed: bool,
}
impl<'d> SetConfig for BufferedUart<'d> {
@ -341,6 +343,7 @@ impl<'d> BufferedUart<'d> {
kernel_clock,
rx,
rts,
is_borrowed: false,
},
tx: BufferedUartTx {
info,
@ -349,6 +352,7 @@ impl<'d> BufferedUart<'d> {
tx,
cts,
de,
is_borrowed: false,
},
};
this.enable_and_configure(tx_buffer, rx_buffer, &config)?;
@ -396,11 +400,29 @@ impl<'d> BufferedUart<'d> {
(self.tx, self.rx)
}
/// Split the Uart into a transmitter and receiver by mutable reference,
/// Split the Uart into a transmitter and receiver,
/// which is particularly useful when having two tasks correlating to
/// transmitting and receiving.
pub fn split_ref(&mut self) -> (&mut BufferedUartTx<'d>, &mut BufferedUartRx<'d>) {
(&mut self.tx, &mut self.rx)
pub fn split_ref(&mut self) -> (BufferedUartTx<'_>, BufferedUartRx<'_>) {
(
BufferedUartTx {
info: self.tx.info,
state: self.tx.state,
kernel_clock: self.tx.kernel_clock,
tx: self.tx.tx.as_mut().map(PeripheralRef::reborrow),
cts: self.tx.cts.as_mut().map(PeripheralRef::reborrow),
de: self.tx.de.as_mut().map(PeripheralRef::reborrow),
is_borrowed: true,
},
BufferedUartRx {
info: self.rx.info,
state: self.rx.state,
kernel_clock: self.rx.kernel_clock,
rx: self.rx.rx.as_mut().map(PeripheralRef::reborrow),
rts: self.rx.rts.as_mut().map(PeripheralRef::reborrow),
is_borrowed: true,
},
)
}
/// Reconfigure the driver
@ -607,6 +629,7 @@ impl<'d> BufferedUartTx<'d> {
impl<'d> Drop for BufferedUartRx<'d> {
fn drop(&mut self) {
if !self.is_borrowed {
let state = self.state;
unsafe {
state.rx_buf.deinit();
@ -623,9 +646,11 @@ impl<'d> Drop for BufferedUartRx<'d> {
drop_tx_rx(self.info, state);
}
}
}
impl<'d> Drop for BufferedUartTx<'d> {
fn drop(&mut self) {
if !self.is_borrowed {
let state = self.state;
unsafe {
state.tx_buf.deinit();
@ -643,6 +668,7 @@ impl<'d> Drop for BufferedUartTx<'d> {
drop_tx_rx(self.info, state);
}
}
}
fn drop_tx_rx(info: &Info, state: &State) {
// We cannot use atomic subtraction here, because it's not supported for all targets