smaller improvements and fixes

bootloader/README.md

@@ -11,10 +11,10 @@ The bootloader uses the following memory map:
 | ------ | ---- |  ---- |
 | 0x0 | Bootloader start | code up to 0x3FFC bytes |
 | 0x3FFC | Bootloader CRC | word |
-| 0x4000 | App image A start | code up to 0x1DFFC (~120K) bytes |
+| 0x4000 | App image A start | code up to 0x1DFF8 (~120K) bytes |
 | 0x21FF8 | App image A CRC check length | word |
 | 0x21FFC | App image A CRC check value | word |
-| 0x22000 | App image B start | code up to 0x1DFFC (~120K) bytes |
+| 0x22000 | App image B start | code up to 0x1DFF8 (~120K) bytes |
 | 0x3FFF8 | App image B CRC check length | word |
 | 0x3FFFC | App image B CRC check value | word |
 | 0x40000 | End of NVM | end  |

bootloader/src/main.rs

@@ -53,7 +53,7 @@ const APP_A_START_ADDR: u32 = BOOTLOADER_END_ADDR;
 const APP_A_SIZE_ADDR: u32 = APP_B_END_ADDR - 8;
 // 0x21FFC
 const APP_A_CRC_ADDR: u32 = APP_B_END_ADDR - 4;
-pub const APP_A_END_ADDR: u32 = APP_B_END_ADDR - BOOTLOADER_END_ADDR / 2;
+pub const APP_A_END_ADDR: u32 = BOOTLOADER_END_ADDR + APP_IMG_SZ;
 
 //  0x22000
 const APP_B_START_ADDR: u32 = APP_A_END_ADDR;

examples/embassy/src/bin/uart-echo-with-irq.rs

@@ -86,7 +86,7 @@ async fn main(spawner: Spawner) {
         &clocks,
     );
     let (mut tx, rx) = uart0.split();
-    let mut rx = rx.to_rx_with_irq();
+    let mut rx = rx.into_rx_with_irq();
     rx.start();
     RX.lock(|static_rx| {
         static_rx.borrow_mut().replace(rx);

flashloader/src/main.rs

@@ -193,7 +193,7 @@ mod app {
         Mono::start(cx.core.SYST, clocks.sysclk().raw());
         CLOCKS.set(clocks).unwrap();
 
-        let mut rx = rx.to_rx_with_irq();
+        let mut rx = rx.into_rx_with_irq();
         let mut rx_context = IrqContextTimeoutOrMaxSize::new(MAX_TC_FRAME_SIZE);
         rx.read_fixed_len_or_timeout_based_using_irq(&mut rx_context)
             .expect("initiating UART RX failed");

scripts/memory_app_a.x

@@ -1,7 +1,7 @@
 /* Special linker script for application slot A with an offset at address 0x4000 */
 MEMORY
 {
-	FLASH : ORIGIN = 0x00004000, LENGTH = 256K
+	FLASH : ORIGIN = 0x00004000, LENGTH = 0x1DFF8
 	/* RAM is a mandatory region. This RAM refers to the SRAM_0 */
 	RAM : ORIGIN = 0x1FFF8000, LENGTH = 32K
 	SRAM_1 : ORIGIN = 0x20000000, LENGTH = 32K

scripts/memory_app_b.x

@@ -1,7 +1,7 @@
 /* Special linker script for application slot B with an offset at address 0x22000 */
 MEMORY
 {
-	FLASH : ORIGIN = 0x00022000, LENGTH = 256K
+	FLASH : ORIGIN = 0x00022000, LENGTH = 0x1DFF8
 	/* RAM is a mandatory region. This RAM refers to the SRAM_0 */
 	RAM : ORIGIN = 0x1FFF8000, LENGTH = 32K
 	SRAM_1 : ORIGIN = 0x20000000, LENGTH = 32K

va416xx-hal/src/uart.rs

@@ -94,6 +94,36 @@ impl From<RxError> for Error {
     }
 }
 
+impl embedded_io::Error for Error {
+    fn kind(&self) -> embedded_io::ErrorKind {
+        embedded_io::ErrorKind::Other
+    }
+}
+
+impl embedded_io::Error for RxError {
+    fn kind(&self) -> embedded_io::ErrorKind {
+        embedded_io::ErrorKind::Other
+    }
+}
+impl embedded_hal_nb::serial::Error for RxError {
+    fn kind(&self) -> embedded_hal_nb::serial::ErrorKind {
+        match self {
+            RxError::Overrun => embedded_hal_nb::serial::ErrorKind::Overrun,
+            RxError::Framing => embedded_hal_nb::serial::ErrorKind::FrameFormat,
+            RxError::Parity => embedded_hal_nb::serial::ErrorKind::Parity,
+        }
+    }
+}
+
+impl embedded_hal_nb::serial::Error for Error {
+    fn kind(&self) -> embedded_hal_nb::serial::ErrorKind {
+        match self {
+            Error::Rx(rx_error) => embedded_hal_nb::serial::Error::kind(rx_error),
+            Error::BreakCondition => embedded_hal_nb::serial::ErrorKind::Other,
+        }
+    }
+}
+
 #[derive(Debug, PartialEq, Eq, Copy, Clone)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Event {
@@ -305,6 +335,50 @@ enum IrqReceptionMode {
     Pending,
 }
 
+#[derive(Default, Debug, Copy, Clone)]
+pub struct IrqUartError {
+    overflow: bool,
+    framing: bool,
+    parity: bool,
+    other: bool,
+}
+
+impl IrqUartError {
+    #[inline(always)]
+    pub fn overflow(&self) -> bool {
+        self.overflow
+    }
+
+    #[inline(always)]
+    pub fn framing(&self) -> bool {
+        self.framing
+    }
+
+    #[inline(always)]
+    pub fn parity(&self) -> bool {
+        self.parity
+    }
+
+    #[inline(always)]
+    pub fn other(&self) -> bool {
+        self.other
+    }
+}
+
+impl IrqUartError {
+    #[inline(always)]
+    pub fn error(&self) -> bool {
+        self.overflow || self.framing || self.parity
+    }
+}
+
+#[derive(Debug, PartialEq, Eq)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
+pub struct BufferTooShortError {
+    found: usize,
+    expected: usize,
+}
+
 //==================================================================================================
 // UART peripheral wrapper
 //==================================================================================================
@@ -510,6 +584,40 @@ impl<Uart: Instance> UartBase<Uart> {
     }
 }
 
+impl<UartInstance> embedded_io::ErrorType for UartBase<UartInstance> {
+    type Error = Error;
+}
+
+impl<UartInstance> embedded_hal_nb::serial::ErrorType for UartBase<UartInstance> {
+    type Error = Error;
+}
+
+impl<Uart: Instance> embedded_hal_nb::serial::Read<u8> for UartBase<Uart> {
+    fn read(&mut self) -> nb::Result<u8, Self::Error> {
+        self.rx.read().map_err(|e| e.map(Error::Rx))
+    }
+}
+
+impl<Uart: Instance> embedded_hal_nb::serial::Write<u8> for UartBase<Uart> {
+    fn write(&mut self, word: u8) -> nb::Result<(), Self::Error> {
+        self.tx.write(word).map_err(|e| {
+            if let nb::Error::Other(_) = e {
+                unreachable!()
+            }
+            nb::Error::WouldBlock
+        })
+    }
+
+    fn flush(&mut self) -> nb::Result<(), Self::Error> {
+        self.tx.flush().map_err(|e| {
+            if let nb::Error::Other(_) = e {
+                unreachable!()
+            }
+            nb::Error::WouldBlock
+        })
+    }
+}
+
 /// Serial abstraction. Entry point to create a new UART
 pub struct Uart<UartInstance, Pins> {
     inner: UartBase<UartInstance>,
@@ -620,9 +728,7 @@ impl<Uart: Instance> Rx<Uart> {
     fn new(uart: Uart) -> Self {
         Self(uart)
     }
-}
 
-impl<Uart: Instance> Rx<Uart> {
     /// Direct access to the peripheral structure.
     ///
     /// # Safety
@@ -674,7 +780,7 @@ impl<Uart: Instance> Rx<Uart> {
         self.0.data().read().bits()
     }
 
-    pub fn to_rx_with_irq(self) -> RxWithIrq<Uart> {
+    pub fn into_rx_with_irq(self) -> RxWithIrq<Uart> {
         RxWithIrq(self)
     }
 
@@ -683,18 +789,69 @@ impl<Uart: Instance> Rx<Uart> {
     }
 }
 
+impl<Uart> embedded_io::ErrorType for Rx<Uart> {
+    type Error = RxError;
+}
+
+impl<Uart> embedded_hal_nb::serial::ErrorType for Rx<Uart> {
+    type Error = RxError;
+}
+
+impl<Uart: Instance> embedded_hal_nb::serial::Read<u8> for Rx<Uart> {
+    fn read(&mut self) -> nb::Result<u8, Self::Error> {
+        let uart = unsafe { &(*Uart::ptr()) };
+        let status_reader = uart.rxstatus().read();
+        let err = if status_reader.rxovr().bit_is_set() {
+            Some(RxError::Overrun)
+        } else if status_reader.rxfrm().bit_is_set() {
+            Some(RxError::Framing)
+        } else if status_reader.rxpar().bit_is_set() {
+            Some(RxError::Parity)
+        } else {
+            None
+        };
+        if let Some(err) = err {
+            // The status code is always related to the next bit for the framing
+            // and parity status bits. We have to read the DATA register
+            // so that the next status reflects the next DATA word
+            // For overrun error, we read as well to clear the peripheral
+            self.read_fifo_unchecked();
+            return Err(err.into());
+        }
+        self.read_fifo().map(|val| (val & 0xff) as u8).map_err(|e| {
+            if let nb::Error::Other(_) = e {
+                unreachable!()
+            }
+            nb::Error::WouldBlock
+        })
+    }
+}
+
+impl<Uart: Instance> embedded_io::Read for Rx<Uart> {
+    fn read(&mut self, buf: &mut [u8]) -> Result<usize, Self::Error> {
+        if buf.is_empty() {
+            return Ok(0);
+        }
+
+        for byte in buf.iter_mut() {
+            let w = nb::block!(<Self as embedded_hal_nb::serial::Read<u8>>::read(self))?;
+            *byte = w;
+        }
+
+        Ok(buf.len())
+    }
+}
+
 /// Serial transmitter
 ///
 /// Can be created by using the [Uart::split] or [UartBase::split] API.
 pub struct Tx<Uart>(Uart);
 
-impl<Uart> Tx<Uart> {
+impl<Uart: Instance> Tx<Uart> {
     fn new(uart: Uart) -> Self {
         Self(uart)
     }
-}
 
-impl<Uart: Instance> Tx<Uart> {
     /// Direct access to the peripheral structure.
     ///
     /// # Safety
@@ -746,48 +903,47 @@ impl<Uart: Instance> Tx<Uart> {
     }
 }
 
-#[derive(Default, Debug, Copy, Clone)]
+impl<Uart> embedded_io::ErrorType for Tx<Uart> {
-pub struct IrqUartError {
+    type Error = Infallible;
-    overflow: bool,
-    framing: bool,
-    parity: bool,
-    other: bool,
 }
 
-impl IrqUartError {
+impl<Uart> embedded_hal_nb::serial::ErrorType for Tx<Uart> {
-    #[inline(always)]
+    type Error = Infallible;
-    pub fn overflow(&self) -> bool {
+}
-        self.overflow
+
+impl<Uart: Instance> embedded_hal_nb::serial::Write<u8> for Tx<Uart> {
+    fn write(&mut self, word: u8) -> nb::Result<(), Self::Error> {
+        self.write_fifo(word as u32)
     }
 
-    #[inline(always)]
+    fn flush(&mut self) -> nb::Result<(), Self::Error> {
-    pub fn framing(&self) -> bool {
+        // SAFETY: Only TX related registers are used.
-        self.framing
+        let reader = unsafe { &(*Uart::ptr()) }.txstatus().read();
-    }
+        if reader.wrbusy().bit_is_set() {
-
+            return Err(nb::Error::WouldBlock);
-    #[inline(always)]
+        }
-    pub fn parity(&self) -> bool {
+        Ok(())
-        self.parity
-    }
-
-    #[inline(always)]
-    pub fn other(&self) -> bool {
-        self.other
     }
 }
 
-impl IrqUartError {
+impl<Uart: Instance> embedded_io::Write for Tx<Uart> {
-    #[inline(always)]
+    fn write(&mut self, buf: &[u8]) -> Result<usize, Self::Error> {
-    pub fn error(&self) -> bool {
+        if buf.is_empty() {
-        self.overflow || self.framing || self.parity
+            return Ok(0);
-    }
+        }
-}
 
-#[derive(Debug, PartialEq, Eq)]
+        for byte in buf.iter() {
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
+            nb::block!(<Self as embedded_hal_nb::serial::Write<u8>>::write(
-pub struct BufferTooShortError {
+                self, *byte
-    found: usize,
+            ))?;
-    expected: usize,
+        }
+
+        Ok(buf.len())
+    }
+
+    fn flush(&mut self) -> Result<(), Self::Error> {
+        nb::block!(<Self as embedded_hal_nb::serial::Write<u8>>::flush(self))
+    }
 }
 
 /// Serial receiver, using interrupts to offload reading to the hardware.
@@ -1063,165 +1219,12 @@ impl<Uart: Instance> RxWithIrq<Uart> {
         context.rx_idx = 0;
     }
 
-    pub fn release(self) -> Uart {
+    /// # Safety
+    ///
+    /// This API allows creating multiple UART instances when releasing the TX structure as well.
+    /// The user must ensure that these instances are not used to create multiple overlapping
+    /// UART drivers.
+    pub unsafe fn release(self) -> Uart {
         self.0.release()
     }
 }
-
-impl embedded_io::Error for Error {
-    fn kind(&self) -> embedded_io::ErrorKind {
-        embedded_io::ErrorKind::Other
-    }
-}
-
-impl embedded_io::Error for RxError {
-    fn kind(&self) -> embedded_io::ErrorKind {
-        embedded_io::ErrorKind::Other
-    }
-}
-
-impl embedded_hal_nb::serial::Error for Error {
-    fn kind(&self) -> embedded_hal_nb::serial::ErrorKind {
-        embedded_hal_nb::serial::ErrorKind::Other
-    }
-}
-
-impl embedded_hal_nb::serial::Error for RxError {
-    fn kind(&self) -> embedded_hal_nb::serial::ErrorKind {
-        match self {
-            RxError::Overrun => embedded_hal_nb::serial::ErrorKind::Overrun,
-            RxError::Framing => embedded_hal_nb::serial::ErrorKind::FrameFormat,
-            RxError::Parity => embedded_hal_nb::serial::ErrorKind::Parity,
-        }
-    }
-}
-
-impl<Uart> embedded_io::ErrorType for Rx<Uart> {
-    type Error = RxError;
-}
-
-impl<Uart> embedded_hal_nb::serial::ErrorType for Rx<Uart> {
-    type Error = RxError;
-}
-
-impl<Uart: Instance> embedded_hal_nb::serial::Read<u8> for Rx<Uart> {
-    fn read(&mut self) -> nb::Result<u8, Self::Error> {
-        let uart = unsafe { &(*Uart::ptr()) };
-        let status_reader = uart.rxstatus().read();
-        let err = if status_reader.rxovr().bit_is_set() {
-            Some(RxError::Overrun)
-        } else if status_reader.rxfrm().bit_is_set() {
-            Some(RxError::Framing)
-        } else if status_reader.rxpar().bit_is_set() {
-            Some(RxError::Parity)
-        } else {
-            None
-        };
-        if let Some(err) = err {
-            // The status code is always related to the next bit for the framing
-            // and parity status bits. We have to read the DATA register
-            // so that the next status reflects the next DATA word
-            // For overrun error, we read as well to clear the peripheral
-            self.read_fifo_unchecked();
-            return Err(err.into());
-        }
-        self.read_fifo().map(|val| (val & 0xff) as u8).map_err(|e| {
-            if let nb::Error::Other(_) = e {
-                unreachable!()
-            }
-            nb::Error::WouldBlock
-        })
-    }
-}
-
-impl<Uart: Instance> embedded_io::Read for Rx<Uart> {
-    fn read(&mut self, buf: &mut [u8]) -> Result<usize, Self::Error> {
-        if buf.is_empty() {
-            return Ok(0);
-        }
-
-        for byte in buf.iter_mut() {
-            let w = nb::block!(<Self as embedded_hal_nb::serial::Read<u8>>::read(self))?;
-            *byte = w;
-        }
-
-        Ok(buf.len())
-    }
-}
-
-impl<Uart> embedded_io::ErrorType for Tx<Uart> {
-    type Error = Infallible;
-}
-
-impl<Uart> embedded_hal_nb::serial::ErrorType for Tx<Uart> {
-    type Error = Infallible;
-}
-
-impl<Uart: Instance> embedded_hal_nb::serial::Write<u8> for Tx<Uart> {
-    fn write(&mut self, word: u8) -> nb::Result<(), Self::Error> {
-        self.write_fifo(word as u32)
-    }
-
-    fn flush(&mut self) -> nb::Result<(), Self::Error> {
-        // SAFETY: Only TX related registers are used.
-        let reader = unsafe { &(*Uart::ptr()) }.txstatus().read();
-        if reader.wrbusy().bit_is_set() {
-            return Err(nb::Error::WouldBlock);
-        }
-        Ok(())
-    }
-}
-
-impl<Uart: Instance> embedded_io::Write for Tx<Uart> {
-    fn write(&mut self, buf: &[u8]) -> Result<usize, Self::Error> {
-        if buf.is_empty() {
-            return Ok(0);
-        }
-
-        for byte in buf.iter() {
-            nb::block!(<Self as embedded_hal_nb::serial::Write<u8>>::write(
-                self, *byte
-            ))?;
-        }
-
-        Ok(buf.len())
-    }
-
-    fn flush(&mut self) -> Result<(), Self::Error> {
-        nb::block!(<Self as embedded_hal_nb::serial::Write<u8>>::flush(self))
-    }
-}
-
-impl<UartInstance> embedded_io::ErrorType for UartBase<UartInstance> {
-    type Error = Error;
-}
-
-impl<UartInstance> embedded_hal_nb::serial::ErrorType for UartBase<UartInstance> {
-    type Error = Error;
-}
-
-impl<Uart: Instance> embedded_hal_nb::serial::Read<u8> for UartBase<Uart> {
-    fn read(&mut self) -> nb::Result<u8, Self::Error> {
-        self.rx.read().map_err(|e| e.map(Error::Rx))
-    }
-}
-
-impl<Uart: Instance> embedded_hal_nb::serial::Write<u8> for UartBase<Uart> {
-    fn write(&mut self, word: u8) -> nb::Result<(), Self::Error> {
-        self.tx.write(word).map_err(|e| {
-            if let nb::Error::Other(_) = e {
-                unreachable!()
-            }
-            nb::Error::WouldBlock
-        })
-    }
-
-    fn flush(&mut self) -> nb::Result<(), Self::Error> {
-        self.tx.flush().map_err(|e| {
-            if let nb::Error::Other(_) = e {
-                unreachable!()
-            }
-            nb::Error::WouldBlock
-        })
-    }
-}