Merge #605

605: stm32: Remove OptionalPin r=Dirbaio a=Dirbaio

The idea behind OptionalPin has a few problems:

- you need to impl the signal traits for NoPin which is a bit weird https://github.com/embassy-rs/embassy/blob/master/embassy-stm32/src/dcmi.rs#L413-L416
- you can pass any combination of set/unset pins, which needs checking at runtime  https://github.com/embassy-rs/embassy/blob/master/embassy-stm32/src/dcmi.rs#L130

The replacement is to do multiple `new` constructors for each combination of pins you want to take.

Co-authored-by: Dario Nieuwenhuis <dirbaio@dirbaio.net>

embassy-rp/src/spi.rs

@@ -62,11 +62,11 @@ fn calc_prescs(freq: u32) -> (u8, u8) {
 
 impl<'d, T: Instance> Spi<'d, T> {
     pub fn new(
-        inner: impl Unborrow<Target = T>,
+        inner: impl Unborrow<Target = T> + 'd,
-        clk: impl Unborrow<Target = impl ClkPin<T>>,
+        clk: impl Unborrow<Target = impl ClkPin<T>> + 'd,
-        mosi: impl Unborrow<Target = impl MosiPin<T>>,
+        mosi: impl Unborrow<Target = impl MosiPin<T>> + 'd,
-        miso: impl Unborrow<Target = impl MisoPin<T>>,
+        miso: impl Unborrow<Target = impl MisoPin<T>> + 'd,
-        cs: impl Unborrow<Target = impl CsPin<T>>,
+        cs: impl Unborrow<Target = impl CsPin<T>> + 'd,
         config: Config,
     ) -> Self {
         unborrow!(inner, clk, mosi, miso, cs);

embassy-rp/src/uart.rs

@@ -30,11 +30,11 @@ pub struct Uart<'d, T: Instance> {
 
 impl<'d, T: Instance> Uart<'d, T> {
     pub fn new(
-        inner: impl Unborrow<Target = T>,
+        inner: impl Unborrow<Target = T> + 'd,
-        tx: impl Unborrow<Target = impl TxPin<T>>,
+        tx: impl Unborrow<Target = impl TxPin<T>> + 'd,
-        rx: impl Unborrow<Target = impl RxPin<T>>,
+        rx: impl Unborrow<Target = impl RxPin<T>> + 'd,
-        cts: impl Unborrow<Target = impl CtsPin<T>>,
+        cts: impl Unborrow<Target = impl CtsPin<T>> + 'd,
-        rts: impl Unborrow<Target = impl RtsPin<T>>,
+        rts: impl Unborrow<Target = impl RtsPin<T>> + 'd,
         config: Config,
     ) -> Self {
         unborrow!(inner, tx, rx, cts, rts);

embassy-stm32/src/crc/v1.rs

@@ -1,16 +1,19 @@
+use core::marker::PhantomData;
+
 use crate::pac::CRC as PAC_CRC;
 use crate::peripherals::CRC;
 use crate::rcc::sealed::RccPeripheral;
 use embassy::util::Unborrow;
 use embassy_hal_common::unborrow;
 
-pub struct Crc {
+pub struct Crc<'d> {
     _peripheral: CRC,
+    _phantom: PhantomData<&'d mut CRC>,
 }
 
-impl Crc {
+impl<'d> Crc<'d> {
     /// Instantiates the CRC32 peripheral and initializes it to default values.
-    pub fn new(peripheral: impl Unborrow<Target = CRC>) -> Self {
+    pub fn new(peripheral: impl Unborrow<Target = CRC> + 'd) -> Self {
         // Note: enable and reset come from RccPeripheral.
         // enable CRC clock in RCC.
         CRC::enable();
@@ -20,6 +23,7 @@ impl Crc {
         unborrow!(peripheral);
         let mut instance = Self {
             _peripheral: peripheral,
+            _phantom: PhantomData,
         };
         instance.reset();
         instance

embassy-stm32/src/crc/v2v3.rs

@@ -1,3 +1,5 @@
+use core::marker::PhantomData;
+
 use crate::pac::crc::vals;
 use crate::pac::CRC as PAC_CRC;
 use crate::peripherals::CRC;
@@ -5,8 +7,9 @@ use crate::rcc::sealed::RccPeripheral;
 use embassy::util::Unborrow;
 use embassy_hal_common::unborrow;
 
-pub struct Crc {
+pub struct Crc<'d> {
     _peripheral: CRC,
+    _phantom: PhantomData<&'d mut CRC>,
     _config: Config,
 }
 
@@ -64,9 +67,9 @@ pub enum PolySize {
     Width32,
 }
 
-impl Crc {
+impl<'d> Crc<'d> {
     /// Instantiates the CRC32 peripheral and initializes it to default values.
-    pub fn new(peripheral: impl Unborrow<Target = CRC>, config: Config) -> Self {
+    pub fn new(peripheral: impl Unborrow<Target = CRC> + 'd, config: Config) -> Self {
         // Note: enable and reset come from RccPeripheral.
         // enable CRC clock in RCC.
         CRC::enable();
@@ -75,6 +78,7 @@ impl Crc {
         unborrow!(peripheral);
         let mut instance = Self {
             _peripheral: peripheral,
+            _phantom: PhantomData,
             _config: config,
         };
         CRC::reset();

embassy-stm32/src/dac/mod.rs

@@ -3,27 +3,21 @@
 #[cfg_attr(dac_v1, path = "v1.rs")]
 #[cfg_attr(dac_v2, path = "v2.rs")]
 mod _version;
-use crate::gpio::NoPin;
 use crate::peripherals;
 pub use _version::*;
 
 pub(crate) mod sealed {
-    use crate::gpio::OptionalPin;
-
     pub trait Instance {
         fn regs() -> &'static crate::pac::dac::Dac;
     }
 
-    pub trait DacPin<T: Instance, const C: u8>: OptionalPin {}
+    pub trait DacPin<T: Instance, const C: u8>: crate::gpio::Pin {}
 }
 
 pub trait Instance: sealed::Instance + 'static {}
 
 pub trait DacPin<T: Instance, const C: u8>: sealed::DacPin<T, C> + 'static {}
 
-impl<T: Instance, const C: u8> DacPin<T, C> for NoPin {}
-impl<T: Instance, const C: u8> sealed::DacPin<T, C> for NoPin {}
-
 crate::pac::peripherals!(
     (dac, $inst:ident) => {
         impl crate::dac::sealed::Instance for peripherals::$inst {

embassy-stm32/src/dac/v2.rs

@@ -1,33 +1,25 @@
 use crate::dac::{DacPin, Instance};
-use crate::gpio::AnyPin;
 use crate::pac::dac;
 use core::marker::PhantomData;
 use embassy::util::Unborrow;
 use embassy_hal_common::unborrow;
 
-/// Sadly we cannot use `RccPeripheral::enable` since devices are quite inconsistent DAC clock
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
-/// configuration.
-unsafe fn enable() {
-    #[cfg(rcc_h7)]
-    crate::pac::RCC.apb1lenr().modify(|w| w.set_dac12en(true));
-    #[cfg(rcc_g0)]
-    crate::pac::RCC.apbenr1().modify(|w| w.set_dac1en(true));
-    #[cfg(rcc_l4)]
-    crate::pac::RCC.apb1enr1().modify(|w| w.set_dac1en(true));
-}
-
-#[derive(Debug)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Error {
     UnconfiguredChannel,
     InvalidValue,
 }
 
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Channel {
     Ch1,
     Ch2,
 }
 
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Ch1Trigger {
     Tim6,
     Tim3,
@@ -52,6 +44,8 @@ impl Ch1Trigger {
     }
 }
 
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Ch2Trigger {
     Tim6,
     Tim8,
@@ -78,46 +72,61 @@ impl Ch2Trigger {
     }
 }
 
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Alignment {
     Left,
     Right,
 }
 
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Value {
     Bit8(u8),
     Bit12(u16, Alignment),
 }
 
 pub struct Dac<'d, T: Instance> {
-    ch1: Option<AnyPin>,
+    channels: u8,
-    ch2: Option<AnyPin>,
     phantom: PhantomData<&'d mut T>,
 }
 
 impl<'d, T: Instance> Dac<'d, T> {
-    pub fn new(
+    pub fn new_1ch(
-        _peri: impl Unborrow<Target = T> + 'd,
+        peri: impl Unborrow<Target = T> + 'd,
-        ch1: impl Unborrow<Target = impl DacPin<T, 1>>,
+        _ch1: impl Unborrow<Target = impl DacPin<T, 1>> + 'd,
-        ch2: impl Unborrow<Target = impl DacPin<T, 2>>,
     ) -> Self {
-        unborrow!(ch1, ch2);
+        unborrow!(peri);
-
+        Self::new_inner(peri, 1)
-        unsafe {
-            enable();
     }
 
-        let ch1 = ch1.degrade_optional();
+    pub fn new_2ch(
-        if ch1.is_some() {
+        peri: impl Unborrow<Target = T> + 'd,
+        _ch1: impl Unborrow<Target = impl DacPin<T, 1>> + 'd,
+        _ch2: impl Unborrow<Target = impl DacPin<T, 2>> + 'd,
+    ) -> Self {
+        unborrow!(peri);
+        Self::new_inner(peri, 2)
+    }
+
+    fn new_inner(_peri: T, channels: u8) -> Self {
         unsafe {
+            // Sadly we cannot use `RccPeripheral::enable` since devices are quite inconsistent DAC clock
+            // configuration.
+            #[cfg(rcc_h7)]
+            crate::pac::RCC.apb1lenr().modify(|w| w.set_dac12en(true));
+            #[cfg(rcc_g0)]
+            crate::pac::RCC.apbenr1().modify(|w| w.set_dac1en(true));
+            #[cfg(rcc_l4)]
+            crate::pac::RCC.apb1enr1().modify(|w| w.set_dac1en(true));
+
+            if channels >= 1 {
                 T::regs().cr().modify(|reg| {
                     reg.set_en1(true);
                 });
             }
-        }
 
-        let ch2 = ch2.degrade_optional();
+            if channels >= 2 {
-        if ch2.is_some() {
-            unsafe {
                 T::regs().cr().modify(|reg| {
                     reg.set_en2(true);
                 });
@@ -125,40 +134,36 @@ impl<'d, T: Instance> Dac<'d, T> {
         }
 
         Self {
-            ch1,
+            channels,
-            ch2,
             phantom: PhantomData,
         }
     }
 
-    fn set_channel_enable(&mut self, ch: Channel, on: bool) -> Result<(), Error> {
+    /// Check the channel is configured
-        match ch {
+    fn check_channel_exists(&self, ch: Channel) -> Result<(), Error> {
-            Channel::Ch1 => {
+        if ch == Channel::Ch2 && self.channels < 2 {
-                if self.ch1.is_none() {
             Err(Error::UnconfiguredChannel)
         } else {
-                    unsafe {
-                        T::regs().cr().modify(|reg| {
-                            reg.set_en1(on);
-                        });
-                    }
             Ok(())
         }
     }
-            Channel::Ch2 => {
+
-                if self.ch2.is_none() {
+    fn set_channel_enable(&mut self, ch: Channel, on: bool) -> Result<(), Error> {
-                    Err(Error::UnconfiguredChannel)
+        self.check_channel_exists(ch)?;
-                } else {
+        match ch {
-                    unsafe {
+            Channel::Ch1 => unsafe {
+                T::regs().cr().modify(|reg| {
+                    reg.set_en1(on);
+                })
+            },
+            Channel::Ch2 => unsafe {
                 T::regs().cr().modify(|reg| {
                     reg.set_en2(on);
                 });
+            },
         }
         Ok(())
     }
-            }
-        }
-    }
 
     pub fn enable_channel(&mut self, ch: Channel) -> Result<(), Error> {
         self.set_channel_enable(ch, true)
@@ -169,9 +174,7 @@ impl<'d, T: Instance> Dac<'d, T> {
     }
 
     pub fn select_trigger_ch1(&mut self, trigger: Ch1Trigger) -> Result<(), Error> {
-        if self.ch1.is_none() {
+        self.check_channel_exists(Channel::Ch1)?;
-            return Err(Error::UnconfiguredChannel);
-        }
         unwrap!(self.disable_channel(Channel::Ch1));
         unsafe {
             T::regs().cr().modify(|reg| {
@@ -182,9 +185,7 @@ impl<'d, T: Instance> Dac<'d, T> {
     }
 
     pub fn select_trigger_ch2(&mut self, trigger: Ch2Trigger) -> Result<(), Error> {
-        if self.ch2.is_none() {
+        self.check_channel_exists(Channel::Ch2)?;
-            return Err(Error::UnconfiguredChannel);
-        }
         unwrap!(self.disable_channel(Channel::Ch2));
         unsafe {
             T::regs().cr().modify(|reg| {
@@ -195,33 +196,21 @@ impl<'d, T: Instance> Dac<'d, T> {
     }
 
     pub fn trigger(&mut self, ch: Channel) -> Result<(), Error> {
+        self.check_channel_exists(ch)?;
         match ch {
-            Channel::Ch1 => {
+            Channel::Ch1 => unsafe {
-                if self.ch1.is_none() {
-                    Err(Error::UnconfiguredChannel)
-                } else {
-                    unsafe {
                 T::regs().swtrigr().write(|reg| {
                     reg.set_swtrig1(true);
                 });
-                    }
+            },
-                    Ok(())
+            Channel::Ch2 => unsafe {
-                }
-            }
-            Channel::Ch2 => {
-                if self.ch2.is_none() {
-                    Err(Error::UnconfiguredChannel)
-                } else {
-                    unsafe {
                 T::regs().swtrigr().write(|reg| {
                     reg.set_swtrig2(true);
-                        });
+                })
+            },
         }
         Ok(())
     }
-            }
-        }
-    }
 
     pub fn trigger_all(&mut self) {
         unsafe {
@@ -233,12 +222,9 @@ impl<'d, T: Instance> Dac<'d, T> {
     }
 
     pub fn set(&mut self, ch: Channel, value: Value) -> Result<(), Error> {
+        self.check_channel_exists(Channel::Ch2)?;
         match ch {
-            Channel::Ch1 => {
+            Channel::Ch1 => match value {
-                if self.ch1.is_none() {
-                    Err(Error::UnconfiguredChannel)
-                } else {
-                    match value {
                 Value::Bit8(v) => unsafe {
                     T::regs().dhr8r1().write(|reg| reg.set_dacc1dhr(v));
                 },
@@ -248,15 +234,8 @@ impl<'d, T: Instance> Dac<'d, T> {
                 Value::Bit12(v, Alignment::Right) => unsafe {
                     T::regs().dhr12r1().write(|reg| reg.set_dacc1dhr(v));
                 },
-                    }
+            },
-                    Ok(())
+            Channel::Ch2 => match value {
-                }
-            }
-            Channel::Ch2 => {
-                if self.ch2.is_none() {
-                    Err(Error::UnconfiguredChannel)
-                } else {
-                    match value {
                 Value::Bit8(v) => unsafe {
                     T::regs().dhr8r2().write(|reg| reg.set_dacc2dhr(v));
                 },
@@ -266,10 +245,8 @@ impl<'d, T: Instance> Dac<'d, T> {
                 Value::Bit12(v, Alignment::Right) => unsafe {
                     T::regs().dhr12r2().write(|reg| reg.set_dacc2dhr(v));
                 },
+            },
         }
         Ok(())
     }
-            }
-        }
-    }
 }

embassy-stm32/src/dcmi.rs

@@ -9,6 +9,15 @@ use embassy::waitqueue::AtomicWaker;
 use embassy_hal_common::unborrow;
 use futures::future::poll_fn;
 
+#[macro_export]
+macro_rules! configure {
+    ($($name:ident),*) => {
+        $(
+            unsafe { $name.unborrow() }.configure();
+        )*
+    }
+}
+
 /// The level on the VSync pin when the data is not valid on the parallel interface.
 #[derive(Clone, Copy, PartialEq)]
 pub enum VSyncDataInvalidLevel {
@@ -50,6 +59,23 @@ pub enum Error {
     PeripheralError,
 }
 
+#[non_exhaustive]
+pub struct Config {
+    pub vsync_level: VSyncDataInvalidLevel,
+    pub hsync_level: HSyncDataInvalidLevel,
+    pub pixclk_polarity: PixelClockPolarity,
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Self {
+            vsync_level: VSyncDataInvalidLevel::High,
+            hsync_level: HSyncDataInvalidLevel::Low,
+            pixclk_polarity: PixelClockPolarity::RisingEdge,
+        }
+    }
+}
+
 pub struct Dcmi<'d, T: Instance, Dma: FrameDma> {
     inner: T,
     dma: Dma,
@@ -61,13 +87,85 @@ where
     T: Instance,
     Dma: FrameDma,
 {
-    pub fn new(
+    pub fn new_8bit(
+        peri: impl Unborrow<Target = T> + 'd,
+        dma: impl Unborrow<Target = Dma> + 'd,
+        irq: impl Unborrow<Target = T::Interrupt> + 'd,
+        d0: impl Unborrow<Target = impl D0Pin> + 'd,
+        d1: impl Unborrow<Target = impl D1Pin> + 'd,
+        d2: impl Unborrow<Target = impl D2Pin> + 'd,
+        d3: impl Unborrow<Target = impl D3Pin> + 'd,
+        d4: impl Unborrow<Target = impl D4Pin> + 'd,
+        d5: impl Unborrow<Target = impl D5Pin> + 'd,
+        d6: impl Unborrow<Target = impl D6Pin> + 'd,
+        d7: impl Unborrow<Target = impl D7Pin> + 'd,
+        v_sync: impl Unborrow<Target = impl VSyncPin> + 'd,
+        h_sync: impl Unborrow<Target = impl HSyncPin> + 'd,
+        pixclk: impl Unborrow<Target = impl PixClkPin> + 'd,
+        config: Config,
+    ) -> Self {
+        unborrow!(peri, dma, irq);
+        configure!(d0, d1, d2, d3, d4, d5, d6, d7);
+        configure!(v_sync, h_sync, pixclk);
+
+        Self::new_inner(peri, dma, irq, config, false, 0b00)
+    }
+    pub fn new_10bit(
+        peri: impl Unborrow<Target = T> + 'd,
+        dma: impl Unborrow<Target = Dma> + 'd,
+        irq: impl Unborrow<Target = T::Interrupt> + 'd,
+        d0: impl Unborrow<Target = impl D0Pin> + 'd,
+        d1: impl Unborrow<Target = impl D1Pin> + 'd,
+        d2: impl Unborrow<Target = impl D2Pin> + 'd,
+        d3: impl Unborrow<Target = impl D3Pin> + 'd,
+        d4: impl Unborrow<Target = impl D4Pin> + 'd,
+        d5: impl Unborrow<Target = impl D5Pin> + 'd,
+        d6: impl Unborrow<Target = impl D6Pin> + 'd,
+        d7: impl Unborrow<Target = impl D7Pin> + 'd,
+        d8: impl Unborrow<Target = impl D8Pin> + 'd,
+        d9: impl Unborrow<Target = impl D9Pin> + 'd,
+        v_sync: impl Unborrow<Target = impl VSyncPin> + 'd,
+        h_sync: impl Unborrow<Target = impl HSyncPin> + 'd,
+        pixclk: impl Unborrow<Target = impl PixClkPin> + 'd,
+        config: Config,
+    ) -> Self {
+        unborrow!(peri, dma, irq);
+        configure!(d0, d1, d2, d3, d4, d5, d6, d7, d8, d9);
+        configure!(v_sync, h_sync, pixclk);
+
+        Self::new_inner(peri, dma, irq, config, false, 0b01)
+    }
+
+    pub fn new_12bit(
+        peri: impl Unborrow<Target = T> + 'd,
+        dma: impl Unborrow<Target = Dma> + 'd,
+        irq: impl Unborrow<Target = T::Interrupt> + 'd,
+        d0: impl Unborrow<Target = impl D0Pin> + 'd,
+        d1: impl Unborrow<Target = impl D1Pin> + 'd,
+        d2: impl Unborrow<Target = impl D2Pin> + 'd,
+        d3: impl Unborrow<Target = impl D3Pin> + 'd,
+        d4: impl Unborrow<Target = impl D4Pin> + 'd,
+        d5: impl Unborrow<Target = impl D5Pin> + 'd,
+        d6: impl Unborrow<Target = impl D6Pin> + 'd,
+        d7: impl Unborrow<Target = impl D7Pin> + 'd,
+        d8: impl Unborrow<Target = impl D8Pin> + 'd,
+        d9: impl Unborrow<Target = impl D9Pin> + 'd,
+        d10: impl Unborrow<Target = impl D10Pin> + 'd,
+        d11: impl Unborrow<Target = impl D11Pin> + 'd,
+        v_sync: impl Unborrow<Target = impl VSyncPin> + 'd,
+        h_sync: impl Unborrow<Target = impl HSyncPin> + 'd,
+        pixclk: impl Unborrow<Target = impl PixClkPin> + 'd,
+        config: Config,
+    ) -> Self {
+        unborrow!(peri, dma, irq);
+        configure!(d0, d1, d2, d3, d4, d5, d6, d7, d8, d9, d10, d11);
+        configure!(v_sync, h_sync, pixclk);
+
+        Self::new_inner(peri, dma, irq, config, false, 0b10)
+    }
+    pub fn new_14bit(
         peri: impl Unborrow<Target = T> + 'd,
         dma: impl Unborrow<Target = Dma> + 'd,
-        vsync_level: VSyncDataInvalidLevel,
-        hsync_level: HSyncDataInvalidLevel,
-        pixclk_polarity: PixelClockPolarity,
-        use_embedded_synchronization: bool,
         irq: impl Unborrow<Target = T::Interrupt> + 'd,
         d0: impl Unborrow<Target = impl D0Pin> + 'd,
         d1: impl Unborrow<Target = impl D1Pin> + 'd,
@@ -86,58 +184,132 @@ where
         v_sync: impl Unborrow<Target = impl VSyncPin> + 'd,
         h_sync: impl Unborrow<Target = impl HSyncPin> + 'd,
         pixclk: impl Unborrow<Target = impl PixClkPin> + 'd,
+        config: Config,
+    ) -> Self {
+        unborrow!(peri, dma, irq);
+        configure!(d0, d1, d2, d3, d4, d5, d6, d7, d8, d9, d10, d11, d12, d13);
+        configure!(v_sync, h_sync, pixclk);
+
+        Self::new_inner(peri, dma, irq, config, false, 0b11)
+    }
+
+    pub fn new_es_8bit(
+        peri: impl Unborrow<Target = T> + 'd,
+        dma: impl Unborrow<Target = Dma> + 'd,
+        irq: impl Unborrow<Target = T::Interrupt> + 'd,
+        d0: impl Unborrow<Target = impl D0Pin> + 'd,
+        d1: impl Unborrow<Target = impl D1Pin> + 'd,
+        d2: impl Unborrow<Target = impl D2Pin> + 'd,
+        d3: impl Unborrow<Target = impl D3Pin> + 'd,
+        d4: impl Unborrow<Target = impl D4Pin> + 'd,
+        d5: impl Unborrow<Target = impl D5Pin> + 'd,
+        d6: impl Unborrow<Target = impl D6Pin> + 'd,
+        d7: impl Unborrow<Target = impl D7Pin> + 'd,
+        pixclk: impl Unborrow<Target = impl PixClkPin> + 'd,
+        config: Config,
+    ) -> Self {
+        unborrow!(peri, dma, irq);
+        configure!(d0, d1, d2, d3, d4, d5, d6, d7);
+        configure!(pixclk);
+
+        Self::new_inner(peri, dma, irq, config, true, 0b00)
+    }
+
+    pub fn new_es_10bit(
+        peri: impl Unborrow<Target = T> + 'd,
+        dma: impl Unborrow<Target = Dma> + 'd,
+        irq: impl Unborrow<Target = T::Interrupt> + 'd,
+        d0: impl Unborrow<Target = impl D0Pin> + 'd,
+        d1: impl Unborrow<Target = impl D1Pin> + 'd,
+        d2: impl Unborrow<Target = impl D2Pin> + 'd,
+        d3: impl Unborrow<Target = impl D3Pin> + 'd,
+        d4: impl Unborrow<Target = impl D4Pin> + 'd,
+        d5: impl Unborrow<Target = impl D5Pin> + 'd,
+        d6: impl Unborrow<Target = impl D6Pin> + 'd,
+        d7: impl Unborrow<Target = impl D7Pin> + 'd,
+        d8: impl Unborrow<Target = impl D8Pin> + 'd,
+        d9: impl Unborrow<Target = impl D9Pin> + 'd,
+        pixclk: impl Unborrow<Target = impl PixClkPin> + 'd,
+        config: Config,
+    ) -> Self {
+        unborrow!(peri, dma, irq);
+        configure!(d0, d1, d2, d3, d4, d5, d6, d7, d8, d9);
+        configure!(pixclk);
+
+        Self::new_inner(peri, dma, irq, config, true, 0b01)
+    }
+
+    pub fn new_es_12bit(
+        peri: impl Unborrow<Target = T> + 'd,
+        dma: impl Unborrow<Target = Dma> + 'd,
+        irq: impl Unborrow<Target = T::Interrupt> + 'd,
+        d0: impl Unborrow<Target = impl D0Pin> + 'd,
+        d1: impl Unborrow<Target = impl D1Pin> + 'd,
+        d2: impl Unborrow<Target = impl D2Pin> + 'd,
+        d3: impl Unborrow<Target = impl D3Pin> + 'd,
+        d4: impl Unborrow<Target = impl D4Pin> + 'd,
+        d5: impl Unborrow<Target = impl D5Pin> + 'd,
+        d6: impl Unborrow<Target = impl D6Pin> + 'd,
+        d7: impl Unborrow<Target = impl D7Pin> + 'd,
+        d8: impl Unborrow<Target = impl D8Pin> + 'd,
+        d9: impl Unborrow<Target = impl D9Pin> + 'd,
+        d10: impl Unborrow<Target = impl D10Pin> + 'd,
+        d11: impl Unborrow<Target = impl D11Pin> + 'd,
+        pixclk: impl Unborrow<Target = impl PixClkPin> + 'd,
+        config: Config,
+    ) -> Self {
+        unborrow!(peri, dma, irq);
+        configure!(d0, d1, d2, d3, d4, d5, d6, d7, d8, d9, d10, d11);
+        configure!(pixclk);
+
+        Self::new_inner(peri, dma, irq, config, true, 0b10)
+    }
+    pub fn new_es_14bit(
+        peri: impl Unborrow<Target = T> + 'd,
+        dma: impl Unborrow<Target = Dma> + 'd,
+        irq: impl Unborrow<Target = T::Interrupt> + 'd,
+        d0: impl Unborrow<Target = impl D0Pin> + 'd,
+        d1: impl Unborrow<Target = impl D1Pin> + 'd,
+        d2: impl Unborrow<Target = impl D2Pin> + 'd,
+        d3: impl Unborrow<Target = impl D3Pin> + 'd,
+        d4: impl Unborrow<Target = impl D4Pin> + 'd,
+        d5: impl Unborrow<Target = impl D5Pin> + 'd,
+        d6: impl Unborrow<Target = impl D6Pin> + 'd,
+        d7: impl Unborrow<Target = impl D7Pin> + 'd,
+        d8: impl Unborrow<Target = impl D8Pin> + 'd,
+        d9: impl Unborrow<Target = impl D9Pin> + 'd,
+        d10: impl Unborrow<Target = impl D10Pin> + 'd,
+        d11: impl Unborrow<Target = impl D11Pin> + 'd,
+        d12: impl Unborrow<Target = impl D12Pin> + 'd,
+        d13: impl Unborrow<Target = impl D13Pin> + 'd,
+        pixclk: impl Unborrow<Target = impl PixClkPin> + 'd,
+        config: Config,
+    ) -> Self {
+        unborrow!(peri, dma, irq);
+        configure!(d0, d1, d2, d3, d4, d5, d6, d7, d8, d9, d10, d11, d12, d13);
+        configure!(pixclk);
+
+        Self::new_inner(peri, dma, irq, config, true, 0b11)
+    }
+
+    fn new_inner(
+        peri: T,
+        dma: Dma,
+        irq: T::Interrupt,
+        config: Config,
+        use_embedded_synchronization: bool,
+        edm: u8,
     ) -> Self {
         T::reset();
         T::enable();
 
-        unborrow!(
-            peri, dma, irq, d0, d1, d2, d3, d4, d5, d6, d7, d8, d9, d10, d11, d12, d13, v_sync,
-            h_sync, pixclk
-        );
-
-        d0.configure();
-        d1.configure();
-        d2.configure();
-        d3.configure();
-        d4.configure();
-        d5.configure();
-        d6.configure();
-        d7.configure();
-        d8.configure();
-        d9.configure();
-        d10.configure();
-        d11.configure();
-        d12.configure();
-        d13.configure();
-
-        v_sync.configure();
-        h_sync.configure();
-        pixclk.configure();
-
-        let edm = match (
-            d8.pin().is_some(),
-            d9.pin().is_some(),
-            d10.pin().is_some(),
-            d11.pin().is_some(),
-            d12.pin().is_some(),
-            d13.pin().is_some(),
-        ) {
-            (true, true, true, true, true, true) => 0b11, // 14 bits
-            (true, true, true, true, false, false) => 0b10, // 12 bits
-            (true, true, false, false, false, false) => 0b01, // 10 bits
-            (false, false, false, false, false, false) => 0b00, // 8 bits
-            _ => {
-                panic!("Invalid pin configuration.");
-            }
-        };
-
         unsafe {
             peri.regs().cr().modify(|r| {
                 r.set_cm(true); // disable continuous mode (snapshot mode)
                 r.set_ess(use_embedded_synchronization);
-                r.set_pckpol(pixclk_polarity == PixelClockPolarity::RisingEdge);
+                r.set_pckpol(config.pixclk_polarity == PixelClockPolarity::RisingEdge);
-                r.set_vspol(vsync_level == VSyncDataInvalidLevel::High);
+                r.set_vspol(config.vsync_level == VSyncDataInvalidLevel::High);
-                r.set_hspol(hsync_level == HSyncDataInvalidLevel::High);
+                r.set_hspol(config.hsync_level == HSyncDataInvalidLevel::High);
                 r.set_fcrc(0x00); // capture every frame
                 r.set_edm(edm); // extended data mode
             });
@@ -271,14 +443,6 @@ mod sealed {
         };
     }
 
-    macro_rules! optional_pin {
-        ($name:ident) => {
-            pub trait $name: crate::gpio::OptionalPin {
-                fn configure(&mut self);
-            }
-        };
-    }
-
     pin!(D0Pin);
     pin!(D1Pin);
     pin!(D2Pin);
@@ -287,15 +451,15 @@ mod sealed {
     pin!(D5Pin);
     pin!(D6Pin);
     pin!(D7Pin);
-    optional_pin!(D8Pin);
+    pin!(D8Pin);
-    optional_pin!(D9Pin);
+    pin!(D9Pin);
-    optional_pin!(D10Pin);
+    pin!(D10Pin);
-    optional_pin!(D11Pin);
+    pin!(D11Pin);
-    optional_pin!(D12Pin);
+    pin!(D12Pin);
-    optional_pin!(D13Pin);
+    pin!(D13Pin);
 
-    optional_pin!(HSyncPin);
+    pin!(HSyncPin);
-    optional_pin!(VSyncPin);
+    pin!(VSyncPin);
     pin!(PixClkPin);
 }
 
@@ -408,24 +572,6 @@ macro_rules! impl_pin {
     };
 }
 
-macro_rules! impl_no_pin {
-    ($signal:ident) => {
-        impl sealed::$signal for crate::gpio::NoPin {
-            fn configure(&mut self) {}
-        }
-        impl $signal for crate::gpio::NoPin {}
-    };
-}
-
-impl_no_pin!(D8Pin);
-impl_no_pin!(D9Pin);
-impl_no_pin!(D10Pin);
-impl_no_pin!(D11Pin);
-impl_no_pin!(D12Pin);
-impl_no_pin!(D13Pin);
-impl_no_pin!(HSyncPin);
-impl_no_pin!(VSyncPin);
-
 crate::pac::peripheral_pins!(
     ($inst:ident, dcmi, DCMI, $pin:ident, D0, $af:expr) => {
         impl_pin!($pin, D0Pin, $af);

embassy-stm32/src/gpio.rs

@@ -544,54 +544,6 @@ impl sealed::Pin for AnyPin {
 
 // ====================
 
-pub trait OptionalPin: sealed::OptionalPin + Sized {
-    type Pin: Pin;
-    fn pin(&self) -> Option<&Self::Pin>;
-    fn pin_mut(&mut self) -> Option<&mut Self::Pin>;
-
-    /// Convert from concrete pin type PX_XX to type erased `Option<AnyPin>`.
-    #[inline]
-    fn degrade_optional(mut self) -> Option<AnyPin> {
-        self.pin_mut()
-            .map(|pin| unsafe { core::ptr::read(pin) }.degrade())
-    }
-}
-
-impl<T: Pin> sealed::OptionalPin for T {}
-impl<T: Pin> OptionalPin for T {
-    type Pin = T;
-
-    #[inline]
-    fn pin(&self) -> Option<&T> {
-        Some(self)
-    }
-
-    #[inline]
-    fn pin_mut(&mut self) -> Option<&mut T> {
-        Some(self)
-    }
-}
-
-#[derive(Clone, Copy, Debug)]
-pub struct NoPin;
-unsafe_impl_unborrow!(NoPin);
-impl sealed::OptionalPin for NoPin {}
-impl OptionalPin for NoPin {
-    type Pin = AnyPin;
-
-    #[inline]
-    fn pin(&self) -> Option<&AnyPin> {
-        None
-    }
-
-    #[inline]
-    fn pin_mut(&mut self) -> Option<&mut AnyPin> {
-        None
-    }
-}
-
-// ====================
-
 crate::pac::pins!(
     ($pin_name:ident, $port_name:ident, $port_num:expr, $pin_num:expr, $exti_ch:ident) => {
         impl Pin for peripherals::$pin_name {

embassy-stm32/src/i2c/v1.rs

@@ -15,8 +15,8 @@ pub struct I2c<'d, T: Instance> {
 impl<'d, T: Instance> I2c<'d, T> {
     pub fn new<F>(
         _peri: impl Unborrow<Target = T> + 'd,
-        scl: impl Unborrow<Target = impl SclPin<T>>,
+        scl: impl Unborrow<Target = impl SclPin<T>> + 'd,
-        sda: impl Unborrow<Target = impl SdaPin<T>>,
+        sda: impl Unborrow<Target = impl SdaPin<T>> + 'd,
         freq: F,
     ) -> Self
     where

embassy-stm32/src/pwm/mod.rs

@@ -248,31 +248,6 @@ crate::pac::interrupts! {
     };
 }
 
-#[allow(unused)]
-macro_rules! impl_pwm_nopin {
-    ($inst:ident) => {
-        impl_no_pin!($inst, Channel1Pin);
-        impl_no_pin!($inst, Channel1ComplementaryPin);
-        impl_no_pin!($inst, Channel2Pin);
-        impl_no_pin!($inst, Channel2ComplementaryPin);
-        impl_no_pin!($inst, Channel3Pin);
-        impl_no_pin!($inst, Channel3ComplementaryPin);
-        impl_no_pin!($inst, Channel4Pin);
-        impl_no_pin!($inst, Channel4ComplementaryPin);
-        impl_no_pin!($inst, ExternalTriggerPin);
-        impl_no_pin!($inst, BreakInputPin);
-        impl_no_pin!($inst, BreakInputComparator1Pin);
-        impl_no_pin!($inst, BreakInputComparator2Pin);
-        impl_no_pin!($inst, BreakInput2Pin);
-        impl_no_pin!($inst, BreakInput2Comparator1Pin);
-        impl_no_pin!($inst, BreakInput2Comparator2Pin);
-    };
-}
-
-crate::pac::peripherals!(
-    (timer, $inst:ident) => { impl_pwm_nopin!($inst); };
-);
-
 crate::pac::peripheral_pins!(
     ($inst:ident, timer, $block:ident, $pin:ident, CH1, $af:expr) => {
         impl_pin!($inst, Channel1Pin, $pin, $af);

embassy-stm32/src/pwm/pins.rs

@@ -1,4 +1,4 @@
-use crate::gpio::OptionalPin;
+use crate::gpio::Pin;
 
 #[cfg(feature = "unstable-pac")]
 pub mod low_level {
@@ -6,118 +6,106 @@ pub mod low_level {
 }
 
 pub(crate) mod sealed {
-    use crate::gpio::sealed::OptionalPin;
+    use crate::gpio::sealed::Pin;
 
-    pub trait Channel1Pin<Timer>: OptionalPin {
+    pub trait Channel1Pin<Timer>: Pin {
         unsafe fn configure(&mut self);
     }
-    pub trait Channel1ComplementaryPin<Timer>: OptionalPin {
+    pub trait Channel1ComplementaryPin<Timer>: Pin {
         unsafe fn configure(&mut self);
     }
 
-    pub trait Channel2Pin<Timer>: OptionalPin {
+    pub trait Channel2Pin<Timer>: Pin {
         unsafe fn configure(&mut self);
     }
-    pub trait Channel2ComplementaryPin<Timer>: OptionalPin {
+    pub trait Channel2ComplementaryPin<Timer>: Pin {
         unsafe fn configure(&mut self);
     }
 
-    pub trait Channel3Pin<Timer>: OptionalPin {
+    pub trait Channel3Pin<Timer>: Pin {
         unsafe fn configure(&mut self);
     }
-    pub trait Channel3ComplementaryPin<Timer>: OptionalPin {
+    pub trait Channel3ComplementaryPin<Timer>: Pin {
         unsafe fn configure(&mut self);
     }
 
-    pub trait Channel4Pin<Timer>: OptionalPin {
+    pub trait Channel4Pin<Timer>: Pin {
         unsafe fn configure(&mut self);
     }
-    pub trait Channel4ComplementaryPin<Timer>: OptionalPin {
+    pub trait Channel4ComplementaryPin<Timer>: Pin {
         unsafe fn configure(&mut self);
     }
 
-    pub trait ExternalTriggerPin<Timer>: OptionalPin {
+    pub trait ExternalTriggerPin<Timer>: Pin {
         unsafe fn configure(&mut self);
     }
 
-    pub trait BreakInputPin<Timer>: OptionalPin {
+    pub trait BreakInputPin<Timer>: Pin {
         unsafe fn configure(&mut self);
     }
-    pub trait BreakInputComparator1Pin<Timer>: OptionalPin {
+    pub trait BreakInputComparator1Pin<Timer>: Pin {
         unsafe fn configure(&mut self);
     }
-    pub trait BreakInputComparator2Pin<Timer>: OptionalPin {
+    pub trait BreakInputComparator2Pin<Timer>: Pin {
         unsafe fn configure(&mut self);
     }
 
-    pub trait BreakInput2Pin<Timer>: OptionalPin {
+    pub trait BreakInput2Pin<Timer>: Pin {
         unsafe fn configure(&mut self);
     }
-    pub trait BreakInput2Comparator1Pin<Timer>: OptionalPin {
+    pub trait BreakInput2Comparator1Pin<Timer>: Pin {
         unsafe fn configure(&mut self);
     }
-    pub trait BreakInput2Comparator2Pin<Timer>: OptionalPin {
+    pub trait BreakInput2Comparator2Pin<Timer>: Pin {
         unsafe fn configure(&mut self);
     }
 }
-pub trait Channel1Pin<Timer>: sealed::Channel1Pin<Timer> + OptionalPin + 'static {}
+pub trait Channel1Pin<Timer>: sealed::Channel1Pin<Timer> + Pin + 'static {}
 pub trait Channel1ComplementaryPin<Timer>:
-    sealed::Channel1ComplementaryPin<Timer> + OptionalPin + 'static
+    sealed::Channel1ComplementaryPin<Timer> + Pin + 'static
 {
 }
 
 pub trait Channel2Pin<Timer>: sealed::Channel2Pin<Timer> + 'static {}
 pub trait Channel2ComplementaryPin<Timer>:
-    sealed::Channel2ComplementaryPin<Timer> + OptionalPin + 'static
+    sealed::Channel2ComplementaryPin<Timer> + Pin + 'static
 {
 }
 
 pub trait Channel3Pin<Timer>: sealed::Channel3Pin<Timer> + 'static {}
 pub trait Channel3ComplementaryPin<Timer>:
-    sealed::Channel3ComplementaryPin<Timer> + OptionalPin + 'static
+    sealed::Channel3ComplementaryPin<Timer> + Pin + 'static
 {
 }
 
 pub trait Channel4Pin<Timer>: sealed::Channel4Pin<Timer> + 'static {}
 pub trait Channel4ComplementaryPin<Timer>:
-    sealed::Channel4ComplementaryPin<Timer> + OptionalPin + 'static
+    sealed::Channel4ComplementaryPin<Timer> + Pin + 'static
 {
 }
 
-pub trait ExternalTriggerPin<Timer>:
+pub trait ExternalTriggerPin<Timer>: sealed::ExternalTriggerPin<Timer> + Pin + 'static {}
-    sealed::ExternalTriggerPin<Timer> + OptionalPin + 'static
-{
-}
 
-pub trait BreakInputPin<Timer>: sealed::BreakInputPin<Timer> + OptionalPin + 'static {}
+pub trait BreakInputPin<Timer>: sealed::BreakInputPin<Timer> + Pin + 'static {}
 pub trait BreakInputComparator1Pin<Timer>:
-    sealed::BreakInputComparator1Pin<Timer> + OptionalPin + 'static
+    sealed::BreakInputComparator1Pin<Timer> + Pin + 'static
 {
 }
 pub trait BreakInputComparator2Pin<Timer>:
-    sealed::BreakInputComparator2Pin<Timer> + OptionalPin + 'static
+    sealed::BreakInputComparator2Pin<Timer> + Pin + 'static
 {
 }
 
-pub trait BreakInput2Pin<Timer>: sealed::BreakInput2Pin<Timer> + OptionalPin + 'static {}
+pub trait BreakInput2Pin<Timer>: sealed::BreakInput2Pin<Timer> + Pin + 'static {}
 pub trait BreakInput2Comparator1Pin<Timer>:
-    sealed::BreakInput2Comparator1Pin<Timer> + OptionalPin + 'static
+    sealed::BreakInput2Comparator1Pin<Timer> + Pin + 'static
 {
 }
 pub trait BreakInput2Comparator2Pin<Timer>:
-    sealed::BreakInput2Comparator2Pin<Timer> + OptionalPin + 'static
+    sealed::BreakInput2Comparator2Pin<Timer> + Pin + 'static
 {
 }
 
-macro_rules! impl_no_pin {
-    ($timer:ident, $signal:ident) => {
-        impl crate::pwm::pins::sealed::$signal<crate::peripherals::$timer> for crate::gpio::NoPin {
-            unsafe fn configure(&mut self) {}
-        }
-        impl crate::pwm::pins::$signal<crate::peripherals::$timer> for crate::gpio::NoPin {}
-    };
-}
-
 #[allow(unused)]
 macro_rules! impl_pin {
     ($timer:ident, $signal:ident, $pin:ident, $af:expr) => {

embassy-stm32/src/pwm/simple_pwm.rs

@@ -12,7 +12,46 @@ pub struct SimplePwm<'d, T> {
 }
 
 impl<'d, T: CaptureCompareCapable16bitInstance> SimplePwm<'d, T> {
-    pub fn new<F: Into<Hertz>>(
+    pub fn new_1ch<F: Into<Hertz>>(
+        tim: impl Unborrow<Target = T> + 'd,
+        ch1: impl Unborrow<Target = impl Channel1Pin<T>> + 'd,
+        freq: F,
+    ) -> Self {
+        unborrow!(ch1);
+        Self::new_inner(tim, freq, move || unsafe {
+            ch1.configure();
+        })
+    }
+
+    pub fn new_2ch<F: Into<Hertz>>(
+        tim: impl Unborrow<Target = T> + 'd,
+        ch1: impl Unborrow<Target = impl Channel1Pin<T>> + 'd,
+        ch2: impl Unborrow<Target = impl Channel2Pin<T>> + 'd,
+        freq: F,
+    ) -> Self {
+        unborrow!(ch1, ch2);
+        Self::new_inner(tim, freq, move || unsafe {
+            ch1.configure();
+            ch2.configure();
+        })
+    }
+
+    pub fn new_3ch<F: Into<Hertz>>(
+        tim: impl Unborrow<Target = T> + 'd,
+        ch1: impl Unborrow<Target = impl Channel1Pin<T>> + 'd,
+        ch2: impl Unborrow<Target = impl Channel2Pin<T>> + 'd,
+        ch3: impl Unborrow<Target = impl Channel3Pin<T>> + 'd,
+        freq: F,
+    ) -> Self {
+        unborrow!(ch1, ch2, ch3);
+        Self::new_inner(tim, freq, move || unsafe {
+            ch1.configure();
+            ch2.configure();
+            ch3.configure();
+        })
+    }
+
+    pub fn new_4ch<F: Into<Hertz>>(
         tim: impl Unborrow<Target = T> + 'd,
         ch1: impl Unborrow<Target = impl Channel1Pin<T>> + 'd,
         ch2: impl Unborrow<Target = impl Channel2Pin<T>> + 'd,
@@ -20,18 +59,27 @@ impl<'d, T: CaptureCompareCapable16bitInstance> SimplePwm<'d, T> {
         ch4: impl Unborrow<Target = impl Channel4Pin<T>> + 'd,
         freq: F,
     ) -> Self {
-        unborrow!(tim, ch1, ch2, ch3, ch4);
+        unborrow!(ch1, ch2, ch3, ch4);
-
+        Self::new_inner(tim, freq, move || unsafe {
-        T::enable();
-        <T as crate::rcc::sealed::RccPeripheral>::reset();
-
-        unsafe {
             ch1.configure();
             ch2.configure();
             ch3.configure();
             ch4.configure();
+        })
     }
 
+    fn new_inner<F: Into<Hertz>>(
+        tim: impl Unborrow<Target = T> + 'd,
+        freq: F,
+        configure_pins: impl FnOnce(),
+    ) -> Self {
+        unborrow!(tim);
+
+        T::enable();
+        <T as crate::rcc::sealed::RccPeripheral>::reset();
+
+        configure_pins();
+
         let mut this = Self {
             inner: tim,
             phantom: PhantomData,

embassy-stm32/src/rng.rs

@@ -1,5 +1,6 @@
 #![macro_use]
 
+use core::marker::PhantomData;
 use core::task::Poll;
 use embassy::util::Unborrow;
 use embassy::waitqueue::AtomicWaker;
@@ -18,16 +19,20 @@ pub enum Error {
     ClockError,
 }
 
-pub struct Rng<T: Instance> {
+pub struct Rng<'d, T: Instance> {
     _inner: T,
+    _phantom: PhantomData<&'d mut T>,
 }
 
-impl<T: Instance> Rng<T> {
+impl<'d, T: Instance> Rng<'d, T> {
-    pub fn new(inner: impl Unborrow<Target = T>) -> Self {
+    pub fn new(inner: impl Unborrow<Target = T> + 'd) -> Self {
         T::enable();
         T::reset();
         unborrow!(inner);
-        let mut random = Self { _inner: inner };
+        let mut random = Self {
+            _inner: inner,
+            _phantom: PhantomData,
+        };
         random.reset();
         random
     }
@@ -88,7 +93,7 @@ impl<T: Instance> Rng<T> {
     }
 }
 
-impl<T: Instance> RngCore for Rng<T> {
+impl<'d, T: Instance> RngCore for Rng<'d, T> {
     fn next_u32(&mut self) -> u32 {
         loop {
             let bits = unsafe { T::regs().sr().read() };
@@ -119,7 +124,7 @@ impl<T: Instance> RngCore for Rng<T> {
     }
 }
 
-impl<T: Instance> CryptoRng for Rng<T> {}
+impl<'d, T: Instance> CryptoRng for Rng<'d, T> {}
 
 pub(crate) mod sealed {
     use super::*;

embassy-stm32/src/sdmmc/v2.rs

@@ -189,7 +189,7 @@ impl<'d, T: Instance, P: Pins<T>> Sdmmc<'d, T, P> {
     pub unsafe fn new(
         _peripheral: impl Unborrow<Target = T> + 'd,
         pins: impl Unborrow<Target = P> + 'd,
-        irq: impl Unborrow<Target = T::Interrupt>,
+        irq: impl Unborrow<Target = T::Interrupt> + 'd,
         config: Config,
     ) -> Self {
         unborrow!(irq, pins);

embassy-stm32/src/spi/mod.rs

@@ -8,8 +8,8 @@ use embassy_hal_common::unborrow;
 use self::sealed::WordSize;
 use crate::dma;
 use crate::dma::NoDma;
-use crate::gpio::sealed::{AFType, Pin};
+use crate::gpio::sealed::{AFType, Pin as _};
-use crate::gpio::{AnyPin, NoPin, OptionalPin};
+use crate::gpio::{AnyPin, Pin};
 use crate::pac::spi::{regs, vals};
 use crate::peripherals;
 use crate::rcc::RccPeripheral;
@@ -92,45 +92,126 @@ pub struct Spi<'d, T: Instance, Tx, Rx> {
 
 impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
     pub fn new<F>(
-        _peri: impl Unborrow<Target = T> + 'd,
+        peri: impl Unborrow<Target = T> + 'd,
-        sck: impl Unborrow<Target = impl SckPin<T>>,
+        sck: impl Unborrow<Target = impl SckPin<T>> + 'd,
-        mosi: impl Unborrow<Target = impl MosiPin<T>>,
+        mosi: impl Unborrow<Target = impl MosiPin<T>> + 'd,
-        miso: impl Unborrow<Target = impl MisoPin<T>>,
+        miso: impl Unborrow<Target = impl MisoPin<T>> + 'd,
-        txdma: impl Unborrow<Target = Tx>,
+        txdma: impl Unborrow<Target = Tx> + 'd,
-        rxdma: impl Unborrow<Target = Rx>,
+        rxdma: impl Unborrow<Target = Rx> + 'd,
         freq: F,
         config: Config,
     ) -> Self
     where
         F: Into<Hertz>,
     {
-        unborrow!(sck, mosi, miso, txdma, rxdma);
+        unborrow!(sck, mosi, miso);
-
-        let sck_af = sck.af_num();
-        let mosi_af = mosi.af_num();
-        let miso_af = miso.af_num();
-        let sck = sck.degrade_optional();
-        let mosi = mosi.degrade_optional();
-        let miso = miso.degrade_optional();
-
         unsafe {
-            sck.as_ref().map(|x| {
+            sck.set_as_af(sck.af_num(), AFType::OutputPushPull);
-                x.set_as_af(sck_af, AFType::OutputPushPull);
             #[cfg(any(spi_v2, spi_v3))]
-                x.set_speed(crate::gpio::Speed::VeryHigh);
+            sck.set_speed(crate::gpio::Speed::VeryHigh);
-            });
+            mosi.set_as_af(mosi.af_num(), AFType::OutputPushPull);
-            mosi.as_ref().map(|x| {
-                x.set_as_af(mosi_af, AFType::OutputPushPull);
             #[cfg(any(spi_v2, spi_v3))]
-                x.set_speed(crate::gpio::Speed::VeryHigh);
+            mosi.set_speed(crate::gpio::Speed::VeryHigh);
-            });
+            miso.set_as_af(miso.af_num(), AFType::Input);
-            miso.as_ref().map(|x| {
-                x.set_as_af(miso_af, AFType::Input);
             #[cfg(any(spi_v2, spi_v3))]
-                x.set_speed(crate::gpio::Speed::VeryHigh);
+            miso.set_speed(crate::gpio::Speed::VeryHigh);
-            });
         }
 
+        Self::new_inner(
+            peri,
+            Some(sck.degrade()),
+            Some(mosi.degrade()),
+            Some(miso.degrade()),
+            txdma,
+            rxdma,
+            freq,
+            config,
+        )
+    }
+
+    pub fn new_rxonly<F>(
+        peri: impl Unborrow<Target = T> + 'd,
+        sck: impl Unborrow<Target = impl SckPin<T>> + 'd,
+        miso: impl Unborrow<Target = impl MisoPin<T>> + 'd,
+        txdma: impl Unborrow<Target = Tx> + 'd, // TODO remove
+        rxdma: impl Unborrow<Target = Rx> + 'd,
+        freq: F,
+        config: Config,
+    ) -> Self
+    where
+        F: Into<Hertz>,
+    {
+        unborrow!(sck, miso);
+        unsafe {
+            sck.set_as_af(sck.af_num(), AFType::OutputPushPull);
+            #[cfg(any(spi_v2, spi_v3))]
+            sck.set_speed(crate::gpio::Speed::VeryHigh);
+            miso.set_as_af(miso.af_num(), AFType::Input);
+            #[cfg(any(spi_v2, spi_v3))]
+            miso.set_speed(crate::gpio::Speed::VeryHigh);
+        }
+
+        Self::new_inner(
+            peri,
+            Some(sck.degrade()),
+            None,
+            Some(miso.degrade()),
+            txdma,
+            rxdma,
+            freq,
+            config,
+        )
+    }
+
+    pub fn new_txonly<F>(
+        peri: impl Unborrow<Target = T> + 'd,
+        sck: impl Unborrow<Target = impl SckPin<T>> + 'd,
+        mosi: impl Unborrow<Target = impl MosiPin<T>> + 'd,
+        txdma: impl Unborrow<Target = Tx> + 'd,
+        rxdma: impl Unborrow<Target = Rx> + 'd, // TODO remove
+        freq: F,
+        config: Config,
+    ) -> Self
+    where
+        F: Into<Hertz>,
+    {
+        unborrow!(sck, mosi);
+        unsafe {
+            sck.set_as_af(sck.af_num(), AFType::OutputPushPull);
+            #[cfg(any(spi_v2, spi_v3))]
+            sck.set_speed(crate::gpio::Speed::VeryHigh);
+            mosi.set_as_af(mosi.af_num(), AFType::OutputPushPull);
+            #[cfg(any(spi_v2, spi_v3))]
+            mosi.set_speed(crate::gpio::Speed::VeryHigh);
+        }
+
+        Self::new_inner(
+            peri,
+            Some(sck.degrade()),
+            Some(mosi.degrade()),
+            None,
+            txdma,
+            rxdma,
+            freq,
+            config,
+        )
+    }
+
+    fn new_inner<F>(
+        _peri: impl Unborrow<Target = T> + 'd,
+        sck: Option<AnyPin>,
+        mosi: Option<AnyPin>,
+        miso: Option<AnyPin>,
+        txdma: impl Unborrow<Target = Tx> + 'd,
+        rxdma: impl Unborrow<Target = Rx> + 'd,
+        freq: F,
+        config: Config,
+    ) -> Self
+    where
+        F: Into<Hertz>,
+    {
+        unborrow!(txdma, rxdma);
+
         let pclk = T::frequency();
         let br = compute_baud_rate(pclk, freq.into());
 
@@ -719,15 +800,15 @@ pub(crate) mod sealed {
         fn regs() -> &'static crate::pac::spi::Spi;
     }
 
-    pub trait SckPin<T: Instance>: OptionalPin {
+    pub trait SckPin<T: Instance>: Pin {
         fn af_num(&self) -> u8;
     }
 
-    pub trait MosiPin<T: Instance>: OptionalPin {
+    pub trait MosiPin<T: Instance>: Pin {
         fn af_num(&self) -> u8;
     }
 
-    pub trait MisoPin<T: Instance>: OptionalPin {
+    pub trait MisoPin<T: Instance>: Pin {
         fn af_num(&self) -> u8;
     }
 
@@ -865,26 +946,6 @@ crate::pac::peripheral_pins!(
     };
 );
 
-macro_rules! impl_nopin {
-    ($inst:ident, $signal:ident) => {
-        impl $signal<peripherals::$inst> for NoPin {}
-
-        impl sealed::$signal<peripherals::$inst> for NoPin {
-            fn af_num(&self) -> u8 {
-                0
-            }
-        }
-    };
-}
-
-crate::pac::peripherals!(
-    (spi, $inst:ident) => {
-        impl_nopin!($inst, SckPin);
-        impl_nopin!($inst, MosiPin);
-        impl_nopin!($inst, MisoPin);
-    };
-);
-
 macro_rules! impl_dma {
     ($inst:ident, {dmamux: $dmamux:ident}, $signal:ident, $request:expr) => {
         impl<T> sealed::$signal<peripherals::$inst> for T

embassy-stm32/src/subghz/mod.rs

@@ -215,11 +215,11 @@ impl<'d, Tx, Rx> SubGhz<'d, Tx, Rx> {
     /// clock.
     pub fn new(
         peri: impl Unborrow<Target = SUBGHZSPI> + 'd,
-        sck: impl Unborrow<Target = impl SckPin<SUBGHZSPI>>,
+        sck: impl Unborrow<Target = impl SckPin<SUBGHZSPI>> + 'd,
-        mosi: impl Unborrow<Target = impl MosiPin<SUBGHZSPI>>,
+        mosi: impl Unborrow<Target = impl MosiPin<SUBGHZSPI>> + 'd,
-        miso: impl Unborrow<Target = impl MisoPin<SUBGHZSPI>>,
+        miso: impl Unborrow<Target = impl MisoPin<SUBGHZSPI>> + 'd,
-        txdma: impl Unborrow<Target = Tx>,
+        txdma: impl Unborrow<Target = Tx> + 'd,
-        rxdma: impl Unborrow<Target = Rx>,
+        rxdma: impl Unborrow<Target = Rx> + 'd,
     ) -> Self {
         Self::pulse_radio_reset();
 

embassy-stm32/src/usart/mod.rs

@@ -81,11 +81,11 @@ pub struct Uart<'d, T: Instance, TxDma = NoDma, RxDma = NoDma> {
 
 impl<'d, T: Instance, TxDma, RxDma> Uart<'d, T, TxDma, RxDma> {
     pub fn new(
-        inner: impl Unborrow<Target = T>,
+        inner: impl Unborrow<Target = T> + 'd,
-        rx: impl Unborrow<Target = impl RxPin<T>>,
+        rx: impl Unborrow<Target = impl RxPin<T>> + 'd,
-        tx: impl Unborrow<Target = impl TxPin<T>>,
+        tx: impl Unborrow<Target = impl TxPin<T>> + 'd,
-        tx_dma: impl Unborrow<Target = TxDma>,
+        tx_dma: impl Unborrow<Target = TxDma> + 'd,
-        rx_dma: impl Unborrow<Target = RxDma>,
+        rx_dma: impl Unborrow<Target = RxDma> + 'd,
         config: Config,
     ) -> Self {
         unborrow!(inner, rx, tx, tx_dma, rx_dma);

examples/stm32g4/src/bin/pwm.rs

@@ -6,7 +6,6 @@
 mod example_common;
 use embassy::executor::Spawner;
 use embassy::time::{Duration, Timer};
-use embassy_stm32::gpio::NoPin;
 use embassy_stm32::pwm::{simple_pwm::SimplePwm, Channel};
 use embassy_stm32::time::U32Ext;
 use embassy_stm32::Peripherals;
@@ -16,7 +15,7 @@ use example_common::*;
 async fn main(_spawner: Spawner, p: Peripherals) {
     info!("Hello World!");
 
-    let mut pwm = SimplePwm::new(p.TIM2, p.PA5, NoPin, NoPin, NoPin, 10000.hz());
+    let mut pwm = SimplePwm::new_1ch(p.TIM2, p.PA5, 10000.hz());
     let max = pwm.get_max_duty();
     pwm.enable(Channel::Ch1);
 

examples/stm32h7/src/bin/camera.rs

@@ -4,8 +4,8 @@
 
 use embassy::executor::Spawner;
 use embassy::time::{Duration, Timer};
-use embassy_stm32::dcmi::*;
+use embassy_stm32::dcmi::{self, *};
-use embassy_stm32::gpio::{Level, NoPin, Output, Speed};
+use embassy_stm32::gpio::{Level, Output, Speed};
 use embassy_stm32::i2c::I2c;
 use embassy_stm32::interrupt;
 use embassy_stm32::rcc::{Mco, Mco1Source, McoClock};
@@ -78,31 +78,10 @@ async fn main(_spawner: Spawner, p: Peripherals) {
     );
 
     let dcmi_irq = interrupt::take!(DCMI);
-    let mut dcmi = Dcmi::new(
+    let config = dcmi::Config::default();
-        p.DCMI,
+    let mut dcmi = Dcmi::new_8bit(
-        p.DMA1_CH0,
+        p.DCMI, p.DMA1_CH0, dcmi_irq, p.PC6, p.PC7, p.PE0, p.PE1, p.PE4, p.PD3, p.PE5, p.PE6,
-        VSyncDataInvalidLevel::High,
+        p.PB7, p.PA4, p.PA6, config,
-        HSyncDataInvalidLevel::Low,
-        PixelClockPolarity::RisingEdge,
-        false,
-        dcmi_irq,
-        p.PC6,
-        p.PC7,
-        p.PE0,
-        p.PE1,
-        p.PE4,
-        p.PD3,
-        p.PE5,
-        p.PE6,
-        NoPin,
-        NoPin,
-        NoPin,
-        NoPin,
-        NoPin,
-        NoPin,
-        p.PB7,
-        p.PA4,
-        p.PA6,
     );
 
     defmt::info!("attempting capture");

examples/stm32h7/src/bin/dac.rs

@@ -5,7 +5,6 @@
 #[path = "../example_common.rs"]
 mod example_common;
 
-use embassy_stm32::gpio::NoPin;
 use example_common::*;
 
 use cortex_m_rt::entry;
@@ -17,7 +16,7 @@ fn main() -> ! {
 
     let p = embassy_stm32::init(config());
 
-    let mut dac = Dac::new(p.DAC1, p.PA4, NoPin);
+    let mut dac = Dac::new_1ch(p.DAC1, p.PA4);
 
     loop {
         for v in 0..=255 {

examples/stm32h7/src/bin/low_level_timer_api.rs

@@ -10,7 +10,6 @@ use embassy::executor::Spawner;
 use embassy::time::{Duration, Timer};
 use embassy::util::Unborrow;
 use embassy_hal_common::unborrow;
-use embassy_stm32::gpio::NoPin;
 use embassy_stm32::pwm::{pins::*, Channel, OutputCompareMode};
 use embassy_stm32::time::{Hertz, U32Ext};
 use embassy_stm32::timer::GeneralPurpose32bitInstance;
@@ -33,7 +32,7 @@ pub fn config() -> Config {
 async fn main(_spawner: Spawner, p: Peripherals) {
     info!("Hello World!");
 
-    let mut pwm = SimplePwm32::new(p.TIM5, p.PA0, NoPin, NoPin, NoPin, 10000.hz());
+    let mut pwm = SimplePwm32::new(p.TIM5, p.PA0, p.PA1, p.PA2, p.PA3, 10000.hz());
     let max = pwm.get_max_duty();
     pwm.enable(Channel::Ch1);
 

examples/stm32h7/src/bin/pwm.rs

@@ -6,7 +6,6 @@
 mod example_common;
 use embassy::executor::Spawner;
 use embassy::time::{Duration, Timer};
-use embassy_stm32::gpio::NoPin;
 use embassy_stm32::pwm::{simple_pwm::SimplePwm, Channel};
 use embassy_stm32::time::U32Ext;
 use embassy_stm32::{Config, Peripherals};
@@ -28,7 +27,7 @@ pub fn config() -> Config {
 async fn main(_spawner: Spawner, p: Peripherals) {
     info!("Hello World!");
 
-    let mut pwm = SimplePwm::new(p.TIM3, p.PA6, NoPin, NoPin, NoPin, 10000.hz());
+    let mut pwm = SimplePwm::new_1ch(p.TIM3, p.PA6, 10000.hz());
     let max = pwm.get_max_duty();
     pwm.enable(Channel::Ch1);
 

examples/stm32l4/src/bin/dac.rs

@@ -6,7 +6,6 @@
 mod example_common;
 
 use embassy_stm32::dac::{Channel, Dac, Value};
-use embassy_stm32::gpio::NoPin;
 use embassy_stm32::pac;
 use example_common::*;
 
@@ -22,7 +21,7 @@ fn main() -> ! {
 
     let p = embassy_stm32::init(Default::default());
 
-    let mut dac = Dac::new(p.DAC1, p.PA4, NoPin);
+    let mut dac = Dac::new_1ch(p.DAC1, p.PA4);
 
     loop {
         for v in 0..=255 {