Impl ReadReady and WriteReady for u8 slices

embedded-hal-nb/src/serial.rs

@@ -127,7 +127,7 @@ where
         let _ = s
             .bytes()
             .map(|c| nb::block!(self.write(Word::from(c))))
-            .last();
+            .next_back();
         Ok(())
     }
 }

embedded-io/CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added `core::error::Error` implementations for every custom `impl Error`
 - Migrated `std` feature-gated `std::error::Error` implementations to `core::error::Error`
 - Increased MSRV to 1.81 due to `core::error::Error`
+- Implemented `ReadReady` for `&[u8]` and `WriteReady` for `&mut [u8]`
 
 ## 0.6.1 - 2023-10-22
 

embedded-io/src/impls/slice_mut.rs

@@ -1,4 +1,4 @@
-use crate::{Error, ErrorKind, ErrorType, SliceWriteError, Write};
+use crate::{Error, ErrorKind, ErrorType, SliceWriteError, Write, WriteReady};
 use core::mem;
 
 impl Error for SliceWriteError {
@@ -47,3 +47,10 @@ impl Write for &mut [u8] {
         Ok(())
     }
 }
+
+impl WriteReady for &mut [u8] {
+    #[inline]
+    fn write_ready(&mut self) -> Result<bool, Self::Error> {
+        Ok(true)
+    }
+}

embedded-io/src/impls/slice_ref.rs

@@ -1,4 +1,4 @@
-use crate::{BufRead, ErrorType, Read};
+use crate::{BufRead, ErrorType, Read, ReadReady};
 
 impl ErrorType for &[u8] {
     type Error = core::convert::Infallible;
@@ -39,3 +39,10 @@ impl BufRead for &[u8] {
         *self = &self[amt..];
     }
 }
+
+impl ReadReady for &[u8] {
+    #[inline]
+    fn read_ready(&mut self) -> Result<bool, Self::Error> {
+        Ok(true)
+    }
+}