bus: use shared fn transaction for exclusive bus too.

Author: Dirbaio

embedded-hal-bus/src/spi/exclusive.rs

@@ -74,29 +74,7 @@ where
 {
     #[inline]
     fn transaction(&mut self, operations: &mut [Operation<'_, Word>]) -> Result<(), Self::Error> {
-        self.cs.set_low().map_err(DeviceError::Cs)?;
-
-        let op_res = operations.iter_mut().try_for_each(|op| match op {
-            Operation::Read(buf) => self.bus.read(buf),
-            Operation::Write(buf) => self.bus.write(buf),
-            Operation::Transfer(read, write) => self.bus.transfer(read, write),
-            Operation::TransferInPlace(buf) => self.bus.transfer_in_place(buf),
-            Operation::DelayUs(us) => {
-                self.bus.flush()?;
-                self.delay.delay_us(*us);
-                Ok(())
-            }
-        });
-
-        // On failure, it's important to still flush and deassert CS.
-        let flush_res = self.bus.flush();
-        let cs_res = self.cs.set_high();
-
-        op_res.map_err(DeviceError::Spi)?;
-        flush_res.map_err(DeviceError::Spi)?;
-        cs_res.map_err(DeviceError::Cs)?;
-
-        Ok(())
+        transaction(operations, &mut self.bus, &mut self.delay, &mut self.cs)
     }
 }