Add blocking shared bus for i2c and SPI

1 files changed, 69 insertions, 0 deletions

diff --git a/embassy-embedded-hal/src/shared_bus/blocking/i2c.rs b/embassy-embedded-hal/src/shared_bus/blocking/i2c.rs
new file mode 100644
index 000000000..2a6ea6dc8
--- /dev/null
+++ b/embassy-embedded-hal/src/shared_bus/blocking/i2c.rs
@@ -0,0 +1,69 @@
+//! Blocking shared I2C bus
+use core::cell::RefCell;
+use core::fmt::Debug;
+use core::future::Future;
+
+use embedded_hal_1::i2c;
+
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
+pub enum I2cBusDeviceError<BUS> {
+    I2c(BUS),
+}
+
+impl<BUS> i2c::Error for I2cBusDeviceError<BUS>
+where
+    BUS: i2c::Error + Debug,
+{
+    fn kind(&self) -> i2c::ErrorKind {
+        match self {
+            Self::I2c(e) => e.kind(),
+        }
+    }
+}
+
+pub struct I2cBusDevice<'a, BUS> {
+    bus: &'a RefCell<BUS>,
+}
+
+impl<'a, BUS> I2cBusDevice<'a, BUS> {
+    pub fn new(bus: &'a RefCell<BUS>) -> Self {
+        Self { bus }
+    }
+}
+
+impl<'a, BUS> i2c::ErrorType for I2cBusDevice<'a, BUS>
+where
+    BUS: i2c::ErrorType,
+{
+    type Error = I2cBusDeviceError<BUS::Error>;
+}
+
+impl<M, BUS> i2c::I2c for I2cBusDevice<'_, BUS>
+where
+    BUS: i2c::I2c,
+{
+    fn read(&mut self, address: u8, buffer: &mut [u8]) -> Result<(), Self::Error> {
+        let mut bus = self.bus.borrow_mut();
+        bus.read(address, buffer).map_err(I2cBusDeviceError::I2c)?;
+        Ok(())
+    }
+
+    fn write(&mut self, address: u8, bytes: &[u8]) -> Result<(), Self::Error> {
+        let mut bus = self.bus.borrow_mut();
+        bus.write(address, bytes).map_err(I2cBusDeviceError::I2c)?;
+        Ok(())
+    }
+
+    fn write_read(&mut self, address: u8, wr_buffer: &[u8], rd_buffer: &mut [u8]) -> Result<(), Self::Error> {
+        let mut bus = self.bus.borrow_mut();
+        bus.write_read(address, wr_buffer, rd_buffer)
+            .map_err(I2cBusDeviceError::I2c)?;
+        Ok(())
+    }
+
+    fn transaction<'a>(&mut self, address: u8, operations: &mut [i2c::Operation<'a>]) -> Result<(), Self::Error> {
+        let _ = address;
+        let _ = operations;
+        todo!()
+    }
+}