stm32: Implement set_config for Uart structs

embassy-stm32/src/spi/mod.rs

@@ -323,7 +323,7 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
     }
 
     /// Reconfigures it with the supplied config.
-    pub fn reconfigure(&mut self, config: Config) {
+    pub fn set_config(&mut self, config: Config) {
         let cpha = config.raw_phase();
         let cpol = config.raw_polarity();
 
@@ -1062,6 +1062,6 @@ foreach_peripheral!(
 impl<'d, T: Instance, Tx, Rx> SetConfig for Spi<'d, T, Tx, Rx> {
     type Config = Config;
     fn set_config(&mut self, config: &Self::Config) {
-        self.reconfigure(*config);
+        self.set_config(*config);
     }
 }

embassy-stm32/src/usart/buffered.rs

@@ -114,6 +114,30 @@ pub struct BufferedUartRx<'d, T: BasicInstance> {
     phantom: PhantomData<&'d mut T>,
 }
 
+impl<'d, T: BasicInstance> SetConfig for BufferedUart<'d, T> {
+    type Config = Config;
+
+    fn set_config(&mut self, config: &Self::Config) {
+        self.set_config(config)
+    }
+}
+
+impl<'d, T: BasicInstance> SetConfig for BufferedUartRx<'d, T> {
+    type Config = Config;
+
+    fn set_config(&mut self, config: &Self::Config) {
+        self.set_config(config)
+    }
+}
+
+impl<'d, T: BasicInstance> SetConfig for BufferedUartTx<'d, T> {
+    type Config = Config;
+
+    fn set_config(&mut self, config: &Self::Config) {
+        self.set_config(config)
+    }
+}
+
 impl<'d, T: BasicInstance> BufferedUart<'d, T> {
     pub fn new(
         peri: impl Peripheral<P = T> + 'd,
@@ -228,6 +252,10 @@ impl<'d, T: BasicInstance> BufferedUart<'d, T> {
     pub fn split(self) -> (BufferedUartTx<'d, T>, BufferedUartRx<'d, T>) {
         (self.tx, self.rx)
     }
+
+    pub fn set_config(&mut self, config: &Config) {
+        reconfigure::<T>(config)
+    }
 }
 
 impl<'d, T: BasicInstance> BufferedUartRx<'d, T> {
@@ -304,6 +332,10 @@ impl<'d, T: BasicInstance> BufferedUartRx<'d, T> {
             T::Interrupt::pend();
         }
     }
+
+    pub fn set_config(&mut self, config: &Config) {
+        reconfigure::<T>(config)
+    }
 }
 
 impl<'d, T: BasicInstance> BufferedUartTx<'d, T> {
@@ -374,6 +406,10 @@ impl<'d, T: BasicInstance> BufferedUartTx<'d, T> {
             }
         }
     }
+
+    pub fn set_config(&mut self, config: &Config) {
+        reconfigure::<T>(config)
+    }
 }
 
 impl<'d, T: BasicInstance> Drop for BufferedUartRx<'d, T> {

embassy-stm32/src/usart/mod.rs

@@ -5,6 +5,7 @@ use core::marker::PhantomData;
 use core::sync::atomic::{compiler_fence, Ordering};
 use core::task::Poll;
 
+use embassy_embedded_hal::SetConfig;
 use embassy_hal_internal::drop::OnDrop;
 use embassy_hal_internal::{into_ref, PeripheralRef};
 use futures::future::{select, Either};
@@ -168,11 +169,28 @@ pub struct Uart<'d, T: BasicInstance, TxDma = NoDma, RxDma = NoDma> {
     rx: UartRx<'d, T, RxDma>,
 }
 
+impl<'d, T: BasicInstance, TxDma, RxDma> SetConfig for Uart<'d, T, TxDma, RxDma> {
+    type Config = Config;
+
+    fn set_config(&mut self, config: &Self::Config) {
+        self.tx.set_config(config);
+        self.rx.set_config(config);
+    }
+}
+
 pub struct UartTx<'d, T: BasicInstance, TxDma = NoDma> {
     phantom: PhantomData<&'d mut T>,
     tx_dma: PeripheralRef<'d, TxDma>,
 }
 
+impl<'d, T: BasicInstance, TxDma> SetConfig for UartTx<'d, T, TxDma> {
+    type Config = Config;
+
+    fn set_config(&mut self, config: &Self::Config) {
+        self.set_config(config);
+    }
+}
+
 pub struct UartRx<'d, T: BasicInstance, RxDma = NoDma> {
     _peri: PeripheralRef<'d, T>,
     rx_dma: PeripheralRef<'d, RxDma>,
@@ -181,6 +199,14 @@ pub struct UartRx<'d, T: BasicInstance, RxDma = NoDma> {
     buffered_sr: stm32_metapac::usart::regs::Sr,
 }
 
+impl<'d, T: BasicInstance, RxDma> SetConfig for UartRx<'d, T, RxDma> {
+    type Config = Config;
+
+    fn set_config(&mut self, config: &Self::Config) {
+        self.set_config(config);
+    }
+}
+
 impl<'d, T: BasicInstance, TxDma> UartTx<'d, T, TxDma> {
     /// Useful if you only want Uart Tx. It saves 1 pin and consumes a little less power.
     pub fn new(
@@ -237,6 +263,10 @@ impl<'d, T: BasicInstance, TxDma> UartTx<'d, T, TxDma> {
         }
     }
 
+    pub fn set_config(&mut self, config: &Config) {
+        reconfigure::<T>(config)
+    }
+
     pub async fn write(&mut self, buffer: &[u8]) -> Result<(), Error>
     where
         TxDma: crate::usart::TxDma<T>,
@@ -334,6 +364,10 @@ impl<'d, T: BasicInstance, RxDma> UartRx<'d, T, RxDma> {
         }
     }
 
+    pub fn set_config(&mut self, config: &Config) {
+        reconfigure::<T>(config)
+    }
+
     #[cfg(any(usart_v1, usart_v2))]
     fn check_rx_flags(&mut self) -> Result<bool, Error> {
         let r = T::regs();
@@ -759,6 +793,10 @@ impl<'d, T: BasicInstance, TxDma, RxDma> Uart<'d, T, TxDma, RxDma> {
         }
     }
 
+    pub fn set_config(&mut self, config: &Config) {
+        reconfigure::<T>(config)
+    }
+
     pub async fn write(&mut self, buffer: &[u8]) -> Result<(), Error>
     where
         TxDma: crate::usart::TxDma<T>,
@@ -804,6 +842,17 @@ impl<'d, T: BasicInstance, TxDma, RxDma> Uart<'d, T, TxDma, RxDma> {
     }
 }
 
+fn reconfigure<T: BasicInstance>(config: &Config) {
+    T::Interrupt::disable();
+    let r = T::regs();
+
+    let cr = r.cr1().read();
+    configure(r, config, T::frequency(), T::KIND, cr.re(), cr.te());
+
+    T::Interrupt::unpend();
+    unsafe { T::Interrupt::enable() };
+}
+
 fn configure(r: Regs, config: &Config, pclk_freq: Hertz, kind: Kind, enable_rx: bool, enable_tx: bool) {
     if !enable_rx && !enable_tx {
         panic!("USART: At least one of RX or TX should be enabled");

embassy-stm32/src/usart/ringbuffered.rs

@@ -3,10 +3,11 @@ use core::mem;
 use core::sync::atomic::{compiler_fence, Ordering};
 use core::task::Poll;
 
+use embassy_embedded_hal::SetConfig;
 use embassy_hal_internal::PeripheralRef;
 use futures::future::{select, Either};
 
-use super::{clear_interrupt_flags, rdr, sr, BasicInstance, Error, UartRx};
+use super::{clear_interrupt_flags, rdr, reconfigure, sr, BasicInstance, Config, Error, UartRx};
 use crate::dma::ReadableRingBuffer;
 use crate::usart::{Regs, Sr};
 
@@ -15,6 +16,14 @@ pub struct RingBufferedUartRx<'d, T: BasicInstance, RxDma: super::RxDma<T>> {
     ring_buf: ReadableRingBuffer<'d, RxDma, u8>,
 }
 
+impl<'d, T: BasicInstance, RxDma: super::RxDma<T>> SetConfig for RingBufferedUartRx<'d, T, RxDma> {
+    type Config = Config;
+
+    fn set_config(&mut self, config: &Self::Config) {
+        self.set_config(config);
+    }
+}
+
 impl<'d, T: BasicInstance, RxDma: super::RxDma<T>> UartRx<'d, T, RxDma> {
     /// Turn the `UartRx` into a buffered uart which can continously receive in the background
     /// without the possibility of loosing bytes. The `dma_buf` is a buffer registered to the
@@ -54,6 +63,11 @@ impl<'d, T: BasicInstance, RxDma: super::RxDma<T>> RingBufferedUartRx<'d, T, RxD
         Err(err)
     }
 
+    pub fn set_config(&mut self, config: &Config) {
+        self.teardown_uart();
+        reconfigure::<T>(config)
+    }
+
     /// Start uart background receive
     fn setup_uart(&mut self) {
         // fence before starting DMA.