rp: impl eh1.0 blocking traits

embassy-rp/Cargo.toml

@@ -12,6 +12,13 @@ edition = "2018"
 # There are no plans to make this stable.
 unstable-pac = []
 
+# Enable nightly-only features
+nightly = ["embassy/nightly", "embedded-hal-1", "embedded-hal-async"]
+
+# Implement embedded-hal 1.0 alpha traits.
+# Implement embedded-hal-async traits if `nightly` is set as well.
+unstable-traits = ["embedded-hal-1"]
+
 [dependencies]
 embassy = { version = "0.1.0", path = "../embassy", features = [ "time-tick-1mhz", "nightly"] }
 embassy-hal-common = {version = "0.1.0", path = "../embassy-hal-common" }
@@ -25,4 +32,7 @@ critical-section = "0.2.5"
 
 rp2040-pac2 = { git = "https://github.com/embassy-rs/rp2040-pac2", rev="9ad7223a48a065e612bc7dc7be5bf5bd0b41cfc4", features = ["rt"] }
 #rp2040-pac2 = { path = "../../rp/rp2040-pac2", features = ["rt"] }
-embedded-hal = { version = "0.2.6", features = [ "unproven" ] }
+
+embedded-hal-02 = { package = "embedded-hal", version = "0.2.6", features = ["unproven"] }
+embedded-hal-1 = { package = "embedded-hal", version = "1.0.0-alpha.6", git = "https://github.com/embassy-rs/embedded-hal", branch = "embassy", optional = true}
+embedded-hal-async = { version = "0.0.1", git = "https://github.com/embassy-rs/embedded-hal", branch = "embassy", optional = true}

embassy-rp/src/gpio.rs

@@ -8,7 +8,6 @@ use crate::peripherals;
 
 use embassy::util::Unborrow;
 use embassy_hal_common::{unborrow, unsafe_impl_unborrow};
-use embedded_hal::digital::v2 as digital;
 
 /// Represents a digital input or output level.
 #[derive(Debug, Eq, PartialEq)]
@@ -81,18 +80,6 @@ impl<'d, T: Pin> Drop for Input<'d, T> {
     }
 }
 
-impl<'d, T: Pin> digital::InputPin for Input<'d, T> {
-    type Error = Infallible;
-
-    fn is_high(&self) -> Result<bool, Self::Error> {
-        Ok(self.is_high())
-    }
-
-    fn is_low(&self) -> Result<bool, Self::Error> {
-        Ok(self.is_low())
-    }
-}
-
 pub struct Output<'d, T: Pin> {
     pin: T,
     phantom: PhantomData<&'d mut T>,
@@ -151,34 +138,6 @@ impl<'d, T: Pin> Drop for Output<'d, T> {
     }
 }
 
-impl<'d, T: Pin> digital::OutputPin for Output<'d, T> {
-    type Error = Infallible;
-
-    /// Set the output as high.
-    fn set_high(&mut self) -> Result<(), Self::Error> {
-        self.set_high();
-        Ok(())
-    }
-
-    /// Set the output as low.
-    fn set_low(&mut self) -> Result<(), Self::Error> {
-        self.set_low();
-        Ok(())
-    }
-}
-
-impl<'d, T: Pin> digital::StatefulOutputPin for Output<'d, T> {
-    /// Is the output pin set as high?
-    fn is_set_high(&self) -> Result<bool, Self::Error> {
-        Ok(self.is_set_high())
-    }
-
-    /// Is the output pin set as low?
-    fn is_set_low(&self) -> Result<bool, Self::Error> {
-        Ok(self.is_set_low())
-    }
-}
-
 pub(crate) mod sealed {
     use super::*;
 
@@ -296,3 +255,86 @@ impl_pin!(PIN_QSPI_SD0, Bank::Qspi, 2);
 impl_pin!(PIN_QSPI_SD1, Bank::Qspi, 3);
 impl_pin!(PIN_QSPI_SD2, Bank::Qspi, 4);
 impl_pin!(PIN_QSPI_SD3, Bank::Qspi, 5);
+
+// ====================
+
+mod eh02 {
+    use super::*;
+
+    impl<'d, T: Pin> embedded_hal_02::digital::v2::InputPin for Input<'d, T> {
+        type Error = Infallible;
+
+        fn is_high(&self) -> Result<bool, Self::Error> {
+            Ok(self.is_high())
+        }
+
+        fn is_low(&self) -> Result<bool, Self::Error> {
+            Ok(self.is_low())
+        }
+    }
+
+    impl<'d, T: Pin> embedded_hal_02::digital::v2::OutputPin for Output<'d, T> {
+        type Error = Infallible;
+
+        fn set_high(&mut self) -> Result<(), Self::Error> {
+            Ok(self.set_high())
+        }
+
+        fn set_low(&mut self) -> Result<(), Self::Error> {
+            Ok(self.set_low())
+        }
+    }
+
+    impl<'d, T: Pin> embedded_hal_02::digital::v2::StatefulOutputPin for Output<'d, T> {
+        fn is_set_high(&self) -> Result<bool, Self::Error> {
+            Ok(self.is_set_high())
+        }
+
+        fn is_set_low(&self) -> Result<bool, Self::Error> {
+            Ok(self.is_set_low())
+        }
+    }
+}
+
+#[cfg(feature = "unstable-traits")]
+mod eh1 {
+    use super::*;
+
+    impl<'d, T: Pin> embedded_hal_1::digital::ErrorType for Input<'d, T> {
+        type Error = Infallible;
+    }
+
+    impl<'d, T: Pin> embedded_hal_1::digital::blocking::InputPin for Input<'d, T> {
+        fn is_high(&self) -> Result<bool, Self::Error> {
+            Ok(self.is_high())
+        }
+
+        fn is_low(&self) -> Result<bool, Self::Error> {
+            Ok(self.is_low())
+        }
+    }
+
+    impl<'d, T: Pin> embedded_hal_1::digital::ErrorType for Output<'d, T> {
+        type Error = Infallible;
+    }
+
+    impl<'d, T: Pin> embedded_hal_1::digital::blocking::OutputPin for Output<'d, T> {
+        fn set_high(&mut self) -> Result<(), Self::Error> {
+            Ok(self.set_high())
+        }
+
+        fn set_low(&mut self) -> Result<(), Self::Error> {
+            Ok(self.set_low())
+        }
+    }
+
+    impl<'d, T: Pin> embedded_hal_1::digital::blocking::StatefulOutputPin for Output<'d, T> {
+        fn is_set_high(&self) -> Result<bool, Self::Error> {
+            Ok(self.is_set_high())
+        }
+
+        fn is_set_low(&self) -> Result<bool, Self::Error> {
+            Ok(self.is_set_low())
+        }
+    }
+}

embassy-rp/src/spi.rs

@@ -2,28 +2,33 @@ use core::marker::PhantomData;
 
 use embassy::util::Unborrow;
 use embassy_hal_common::unborrow;
-use embedded_hal::blocking::spi as eh;
-use embedded_hal::spi as ehnb;
 
 use crate::gpio::sealed::Pin as _;
 use crate::gpio::{AnyPin, Pin as GpioPin};
 use crate::{pac, peripherals};
 
-pub use ehnb::{Phase, Polarity};
+pub use embedded_hal_02::spi::{Phase, Polarity};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
+#[non_exhaustive]
+pub enum Error {
+    // No errors for now
+}
 
 #[non_exhaustive]
 pub struct Config {
     pub frequency: u32,
-    pub phase: ehnb::Phase,
+    pub phase: Phase,
-    pub polarity: ehnb::Polarity,
+    pub polarity: Polarity,
 }
 
 impl Default for Config {
     fn default() -> Self {
         Self {
             frequency: 1_000_000,
-            phase: ehnb::Phase::CaptureOnFirstTransition,
+            phase: Phase::CaptureOnFirstTransition,
-            polarity: ehnb::Polarity::IdleLow,
+            polarity: Polarity::IdleLow,
         }
     }
 }
@@ -130,8 +135,8 @@ impl<'d, T: Instance> Spi<'d, T> {
             p.cpsr().write(|w| w.set_cpsdvsr(presc));
             p.cr0().write(|w| {
                 w.set_dss(0b0111); // 8bit
-                w.set_spo(config.polarity == ehnb::Polarity::IdleHigh);
+                w.set_spo(config.polarity == Polarity::IdleHigh);
-                w.set_sph(config.phase == ehnb::Phase::CaptureOnSecondTransition);
+                w.set_sph(config.phase == Phase::CaptureOnSecondTransition);
                 w.set_scr(postdiv);
             });
             p.cr1().write(|w| {
@@ -157,7 +162,7 @@ impl<'d, T: Instance> Spi<'d, T> {
         }
     }
 
-    pub fn write(&mut self, data: &[u8]) {
+    pub fn blocking_write(&mut self, data: &[u8]) -> Result<(), Error> {
         unsafe {
             let p = self.inner.regs();
             for &b in data {
@@ -166,11 +171,12 @@ impl<'d, T: Instance> Spi<'d, T> {
                 while !p.sr().read().rne() {}
                 let _ = p.dr().read();
             }
-            self.flush();
         }
+        self.flush()?;
+        Ok(())
     }
 
-    pub fn transfer(&mut self, data: &mut [u8]) {
+    pub fn blocking_transfer_in_place(&mut self, data: &mut [u8]) -> Result<(), Error> {
         unsafe {
             let p = self.inner.regs();
             for b in data {
@@ -179,15 +185,50 @@ impl<'d, T: Instance> Spi<'d, T> {
                 while !p.sr().read().rne() {}
                 *b = p.dr().read().data() as u8;
             }
-            self.flush();
         }
+        self.flush()?;
+        Ok(())
     }
 
-    pub fn flush(&mut self) {
+    pub fn blocking_read(&mut self, data: &mut [u8]) -> Result<(), Error> {
+        unsafe {
+            let p = self.inner.regs();
+            for b in data {
+                while !p.sr().read().tnf() {}
+                p.dr().write(|w| w.set_data(0));
+                while !p.sr().read().rne() {}
+                *b = p.dr().read().data() as u8;
+            }
+        }
+        self.flush()?;
+        Ok(())
+    }
+
+    pub fn blocking_transfer(&mut self, read: &mut [u8], write: &[u8]) -> Result<(), Error> {
+        unsafe {
+            let p = self.inner.regs();
+            let len = read.len().max(write.len());
+            for i in 0..len {
+                let wb = write.get(i).copied().unwrap_or(0);
+                while !p.sr().read().tnf() {}
+                p.dr().write(|w| w.set_data(wb as _));
+                while !p.sr().read().rne() {}
+                let rb = p.dr().read().data() as u8;
+                if let Some(r) = read.get_mut(i) {
+                    *r = rb;
+                }
+            }
+        }
+        self.flush()?;
+        Ok(())
+    }
+
+    pub fn flush(&mut self) -> Result<(), Error> {
         unsafe {
             let p = self.inner.regs();
             while p.sr().read().bsy() {}
         }
+        Ok(())
     }
 
     pub fn set_frequency(&mut self, freq: u32) {
@@ -209,23 +250,6 @@ impl<'d, T: Instance> Spi<'d, T> {
     }
 }
 
-impl<'d, T: Instance> eh::Write<u8> for Spi<'d, T> {
-    type Error = core::convert::Infallible;
-
-    fn write(&mut self, words: &[u8]) -> Result<(), Self::Error> {
-        self.write(words);
-        Ok(())
-    }
-}
-
-impl<'d, T: Instance> eh::Transfer<u8> for Spi<'d, T> {
-    type Error = core::convert::Infallible;
-    fn transfer<'w>(&mut self, words: &'w mut [u8]) -> Result<&'w [u8], Self::Error> {
-        self.transfer(words);
-        Ok(words)
-    }
-}
-
 mod sealed {
     use super::*;
 
@@ -281,3 +305,102 @@ impl_pin!(PIN_16, SPI0, MisoPin);
 impl_pin!(PIN_17, SPI0, CsPin);
 impl_pin!(PIN_18, SPI0, ClkPin);
 impl_pin!(PIN_19, SPI0, MosiPin);
+
+// ====================
+
+mod eh02 {
+    use super::*;
+
+    impl<'d, T: Instance> embedded_hal_02::blocking::spi::Transfer<u8> for Spi<'d, T> {
+        type Error = Error;
+        fn transfer<'w>(&mut self, words: &'w mut [u8]) -> Result<&'w [u8], Self::Error> {
+            self.blocking_transfer_in_place(words)?;
+            Ok(words)
+        }
+    }
+
+    impl<'d, T: Instance> embedded_hal_02::blocking::spi::Write<u8> for Spi<'d, T> {
+        type Error = Error;
+
+        fn write(&mut self, words: &[u8]) -> Result<(), Self::Error> {
+            self.blocking_write(words)
+        }
+    }
+}
+
+#[cfg(feature = "unstable-traits")]
+mod eh1 {
+    use super::*;
+
+    impl embedded_hal_1::spi::Error for Error {
+        fn kind(&self) -> embedded_hal_1::spi::ErrorKind {
+            match *self {}
+        }
+    }
+
+    impl<'d, T: Instance> embedded_hal_1::spi::ErrorType for Spi<'d, T> {
+        type Error = Error;
+    }
+
+    impl<'d, T: Instance> embedded_hal_1::spi::blocking::Read<u8> for Spi<'d, T> {
+        fn read(&mut self, words: &mut [u8]) -> Result<(), Self::Error> {
+            self.blocking_transfer(words, &[])
+        }
+
+        fn read_transaction(&mut self, words: &mut [&mut [u8]]) -> Result<(), Self::Error> {
+            for buf in words {
+                self.blocking_read(buf)?
+            }
+            Ok(())
+        }
+    }
+
+    impl<'d, T: Instance> embedded_hal_1::spi::blocking::Write<u8> for Spi<'d, T> {
+        fn write(&mut self, words: &[u8]) -> Result<(), Self::Error> {
+            self.blocking_write(words)
+        }
+
+        fn write_transaction(&mut self, words: &[&[u8]]) -> Result<(), Self::Error> {
+            for buf in words {
+                self.blocking_write(buf)?
+            }
+            Ok(())
+        }
+
+        fn write_iter<WI>(&mut self, words: WI) -> Result<(), Self::Error>
+        where
+            WI: IntoIterator<Item = u8>,
+        {
+            for w in words {
+                self.blocking_write(&[w])?;
+            }
+            Ok(())
+        }
+    }
+
+    impl<'d, T: Instance> embedded_hal_1::spi::blocking::ReadWrite<u8> for Spi<'d, T> {
+        fn transfer(&mut self, read: &mut [u8], write: &[u8]) -> Result<(), Self::Error> {
+            self.blocking_transfer(read, write)
+        }
+
+        fn transfer_in_place(&mut self, words: &mut [u8]) -> Result<(), Self::Error> {
+            self.blocking_transfer_in_place(words)
+        }
+
+        fn transaction<'a>(
+            &mut self,
+            operations: &mut [embedded_hal_1::spi::blocking::Operation<'a, u8>],
+        ) -> Result<(), Self::Error> {
+            use embedded_hal_1::spi::blocking::Operation;
+            for o in operations {
+                match o {
+                    Operation::Read(b) => self.blocking_read(b)?,
+                    Operation::Write(b) => self.blocking_write(b)?,
+                    Operation::Transfer(r, w) => self.blocking_transfer(r, w)?,
+                    Operation::TransferInPlace(b) => self.blocking_transfer_in_place(b)?,
+                }
+            }
+            Ok(())
+        }
+    }
+}

examples/rp/.cargo/config.toml

@@ -1,5 +1,5 @@
 [target.'cfg(all(target_arch = "arm", target_os = "none"))']
-runner = "probe-run-rp --chip RP2040"
+runner = "probe-run --chip RP2040"
 
 [build]
 target = "thumbv6m-none-eabi"        # Cortex-M0 and Cortex-M0+

examples/rp/Cargo.toml

@@ -7,7 +7,7 @@ version = "0.1.0"
 
 [dependencies]
 embassy = { version = "0.1.0", path = "../../embassy", features = ["defmt"] }
-embassy-rp = { version = "0.1.0", path = "../../embassy-rp", features = ["defmt"] }
+embassy-rp = { version = "0.1.0", path = "../../embassy-rp", features = ["defmt", "unstable-traits", "nightly", "unstable-pac"] }
 atomic-polyfill = "0.1.5"
 
 defmt = "0.3"

examples/rp/src/bin/spi.rs

@@ -34,7 +34,7 @@ async fn main(_spawner: Spawner, p: Peripherals) {
     loop {
         cs.set_low();
         let mut buf = [0x90, 0x00, 0x00, 0xd0, 0x00, 0x00];
-        spi.transfer(&mut buf);
+        spi.blocking_transfer_in_place(&mut buf).unwrap();
         cs.set_high();
 
         let x = (buf[1] as u32) << 5 | (buf[2] as u32) >> 3;

examples/rp/src/bin/spi_display.rs

@@ -131,7 +131,7 @@ impl<'a> embedded_hal::blocking::spi::Write<u8> for DisplaySpi<'a> {
             this.display_cs.set_low();
             this.last_mode = SpiMode::Display;
         }
-        this.spi.write(words);
+        this.spi.write(words).unwrap();
         Ok(())
     }
 }
@@ -147,7 +147,7 @@ impl<'a> embedded_hal::blocking::spi::Transfer<u8> for TouchSpi<'a> {
             this.display_cs.set_high();
             this.last_mode = SpiMode::Touch;
         }
-        this.spi.transfer(words);
+        this.spi.transfer(words).unwrap();
         Ok(words)
     }
 }