1 files changed, 171 insertions, 0 deletions

diff --git a/embassy-embedded-hal/src/adapter/blocking_async.rs b/embassy-embedded-hal/src/adapter/blocking_async.rs
new file mode 100644
index 000000000..b996d6a75
--- /dev/null
+++ b/embassy-embedded-hal/src/adapter/blocking_async.rs
@@ -0,0 +1,171 @@
+use embedded_hal_02::{blocking, serial};
+
+/// Wrapper that implements async traits using blocking implementations.
+///
+/// This allows driver writers to depend on the async traits while still supporting embedded-hal peripheral implementations.
+///
+/// BlockingAsync will implement any async trait that maps to embedded-hal traits implemented for the wrapped driver.
+///
+/// Driver users are then free to choose which implementation that is available to them.
+pub struct BlockingAsync<T> {
+    wrapped: T,
+}
+
+impl<T> BlockingAsync<T> {
+    /// Create a new instance of a wrapper for a given peripheral.
+    pub fn new(wrapped: T) -> Self {
+        Self { wrapped }
+    }
+}
+
+//
+// I2C implementations
+//
+impl<T, E> embedded_hal_1::i2c::ErrorType for BlockingAsync<T>
+where
+    E: embedded_hal_1::i2c::Error + 'static,
+    T: blocking::i2c::WriteRead<Error = E> + blocking::i2c::Read<Error = E> + blocking::i2c::Write<Error = E>,
+{
+    type Error = E;
+}
+
+impl<T, E> embedded_hal_async::i2c::I2c for BlockingAsync<T>
+where
+    E: embedded_hal_1::i2c::Error + 'static,
+    T: blocking::i2c::WriteRead<Error = E> + blocking::i2c::Read<Error = E> + blocking::i2c::Write<Error = E>,
+{
+    async fn read(&mut self, address: u8, read: &mut [u8]) -> Result<(), Self::Error> {
+        self.wrapped.read(address, read)
+    }
+
+    async fn write(&mut self, address: u8, write: &[u8]) -> Result<(), Self::Error> {
+        self.wrapped.write(address, write)
+    }
+
+    async fn write_read(&mut self, address: u8, write: &[u8], read: &mut [u8]) -> Result<(), Self::Error> {
+        self.wrapped.write_read(address, write, read)
+    }
+
+    async fn transaction(
+        &mut self,
+        address: u8,
+        operations: &mut [embedded_hal_1::i2c::Operation<'_>],
+    ) -> Result<(), Self::Error> {
+        let _ = address;
+        let _ = operations;
+        todo!()
+    }
+}
+
+//
+// SPI implementatinos
+//
+
+impl<T, E> embedded_hal_async::spi::ErrorType for BlockingAsync<T>
+where
+    E: embedded_hal_1::spi::Error,
+    T: blocking::spi::Transfer<u8, Error = E> + blocking::spi::Write<u8, Error = E>,
+{
+    type Error = E;
+}
+
+impl<T, E> embedded_hal_async::spi::SpiBus<u8> for BlockingAsync<T>
+where
+    E: embedded_hal_1::spi::Error + 'static,
+    T: blocking::spi::Transfer<u8, Error = E> + blocking::spi::Write<u8, Error = E>,
+{
+    async fn transfer<'a>(&'a mut self, read: &'a mut [u8], write: &'a [u8]) -> Result<(), Self::Error> {
+        // Ensure we write the expected bytes
+        for i in 0..core::cmp::min(read.len(), write.len()) {
+            read[i] = write[i].clone();
+        }
+        self.wrapped.transfer(read)?;
+        Ok(())
+    }
+
+    async fn transfer_in_place<'a>(&'a mut self, _: &'a mut [u8]) -> Result<(), Self::Error> {
+        todo!()
+    }
+}
+
+impl<T, E> embedded_hal_async::spi::SpiBusFlush for BlockingAsync<T>
+where
+    E: embedded_hal_1::spi::Error + 'static,
+    T: blocking::spi::Transfer<u8, Error = E> + blocking::spi::Write<u8, Error = E>,
+{
+    async fn flush(&mut self) -> Result<(), Self::Error> {
+        Ok(())
+    }
+}
+
+impl<T, E> embedded_hal_async::spi::SpiBusWrite<u8> for BlockingAsync<T>
+where
+    E: embedded_hal_1::spi::Error + 'static,
+    T: blocking::spi::Transfer<u8, Error = E> + blocking::spi::Write<u8, Error = E>,
+{
+    async fn write(&mut self, data: &[u8]) -> Result<(), Self::Error> {
+        self.wrapped.write(data)?;
+        Ok(())
+    }
+}
+
+impl<T, E> embedded_hal_async::spi::SpiBusRead<u8> for BlockingAsync<T>
+where
+    E: embedded_hal_1::spi::Error + 'static,
+    T: blocking::spi::Transfer<u8, Error = E> + blocking::spi::Write<u8, Error = E>,
+{
+    async fn read(&mut self, data: &mut [u8]) -> Result<(), Self::Error> {
+        self.wrapped.transfer(data)?;
+        Ok(())
+    }
+}
+
+// Uart implementatinos
+impl<T, E> embedded_hal_1::serial::ErrorType for BlockingAsync<T>
+where
+    T: serial::Read<u8, Error = E>,
+    E: embedded_hal_1::serial::Error + 'static,
+{
+    type Error = E;
+}
+
+/// NOR flash wrapper
+use embedded_storage::nor_flash::{ErrorType, NorFlash, ReadNorFlash};
+use embedded_storage_async::nor_flash::{NorFlash as AsyncNorFlash, ReadNorFlash as AsyncReadNorFlash};
+
+impl<T> ErrorType for BlockingAsync<T>
+where
+    T: ErrorType,
+{
+    type Error = T::Error;
+}
+
+impl<T> AsyncNorFlash for BlockingAsync<T>
+where
+    T: NorFlash,
+{
+    const WRITE_SIZE: usize = <T as NorFlash>::WRITE_SIZE;
+    const ERASE_SIZE: usize = <T as NorFlash>::ERASE_SIZE;
+
+    async fn write(&mut self, offset: u32, data: &[u8]) -> Result<(), Self::Error> {
+        self.wrapped.write(offset, data)
+    }
+
+    async fn erase(&mut self, from: u32, to: u32) -> Result<(), Self::Error> {
+        self.wrapped.erase(from, to)
+    }
+}
+
+impl<T> AsyncReadNorFlash for BlockingAsync<T>
+where
+    T: ReadNorFlash,
+{
+    const READ_SIZE: usize = <T as ReadNorFlash>::READ_SIZE;
+    async fn read(&mut self, address: u32, data: &mut [u8]) -> Result<(), Self::Error> {
+        self.wrapped.read(address, data)
+    }
+
+    fn capacity(&self) -> usize {
+        self.wrapped.capacity()
+    }
+}