prepare v0.3.0: change API to Iterator, implement core::error::Error & add some Copy, Clone, Hash where applicable

.github/workflows/CI.yml

@@ -13,13 +13,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        rust: [1.62.0, stable]
-        features: ['use_alloc', 'use_alloc,defmt', 'use_heapless', 'use_heapless,defmt']
-        exclude:
-          - rust: 1.62.0
-            features: 'use_alloc,defmt'
-          - rust: 1.62.0
-            features: 'use_heapless,defmt'
+        rust: [1.81.0, stable]
+        features: ['']
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -31,17 +26,17 @@ jobs:
       - name: Install required cargo components
         run: cargo +stable install clippy-sarif sarif-fmt
       - name: build
-        run: cargo build --features ${{ matrix.features }}
+        run: cargo build ${{ matrix.features }}
       - name: check
-        run: cargo check --features ${{ matrix.features }}
+        run: cargo check ${{ matrix.features }}
       - name: test
-        run: cargo test --features ${{ matrix.features }}
+        run: cargo test ${{ matrix.features }}
       - name: check formatting
         run: cargo fmt --all -- --check
       - name: audit
         run: cargo audit
       - name: clippy (lib)
-        run: cargo clippy --features ${{ matrix.features }} --message-format=json | clippy-sarif | tee rust-clippy-results.sarif | sarif-fmt
+        run: cargo clippy ${{ matrix.features }} --message-format=json | clippy-sarif | tee rust-clippy-results.sarif | sarif-fmt
         continue-on-error: true
       - name: Upload analysis results to GitHub
         uses: github/codeql-action/upload-sarif@v3
@@ -87,3 +82,17 @@ jobs:
         with:
           sarif_file: examples/stm32f4-event-printer/rust-clippy-results.sarif
           wait-for-processing: true
+
+  # simplify GH settings: have one single build to be required
+  build-results:
+    name: Final Results
+    if: ${{ always() }}
+    runs-on: ubuntu-latest
+    needs: [lib, stm32f4-event-printer]
+    steps:
+      - name: check for failed builds of the library
+        if: ${{ needs.lib.result != 'success' }}
+        run: exit 1
+      - name: check for failed builds of the example
+        if: ${{ needs.stm32f4-event-printer.result != 'success' }}
+        run: exit 1

CHANGELOG.md

@@ -6,6 +6,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 <!-- next-header -->
 ## [Unreleased] - ReleaseDate
+### Added
+* `Copy`, `Clone` and `Hash` on error & event types (where possible)
+### Changed
+* The MSRV has been updated to 1.81.0 due to `core::error::Error` being implemented
+* **BREAKING**: The `parse` API has been replaced with `Parser::new` where `Parser` now implements `Iterator` and the `next` function returns each parsed command
+  * Accordingly, the features `use_alloc` and `use_heapless` have been removed.
 
 ## [0.2.0] - 2023-11-14
 ### Added

Cargo.toml

@@ -2,7 +2,7 @@
 name = "adafruit-bluefruit-protocol"
 version = "0.2.0"
 edition = "2021"
-rust-version = "1.62"
+rust-version = "1.81"
 
 description = "A `no_std` parser for the Adafruit Bluefruit LE Connect controller protocol."
 repository = "https://github.com/rust-embedded-community/adafruit-bluefruit-protocol-rs"
@@ -12,18 +12,14 @@ license = "MIT OR Apache-2.0"
 
 [dependencies]
 defmt = { version = "0.3", optional = true }
-heapless = { version = "0.8", optional = true }
 
 rgb = { version = "0.8", optional = true }
 serde = { version = "1.0", features = ["derive"], optional = true }
 
 [features]
 default = ["accelerometer_event", "button_event", "color_event", "gyro_event", "location_event", "magnetometer_event", "quaternion_event"]
 
-use_heapless = ["dep:heapless"]
-use_alloc = []
-
-defmt = ["dep:defmt", "heapless?/defmt-03"]
+defmt = ["dep:defmt"]
 
 accelerometer_event = []
 button_event = []

README.md

@@ -9,12 +9,6 @@ which is e.g. used by the [Adafruit Bluefruit LE UART Friend](https://learn.adaf
 
 Note that this work is not affiliated with Adafruit.
 
-## Mandatory Features
-This crate is `no_std` and you can choose whether you want to use
-[`heapless::Vec`](https://docs.rs/heapless/0.8.0/heapless/struct.Vec.html) by selecting the feature `use_heapless` or
-[`alloc::vec::Vec`](https://doc.rust-lang.org/alloc/vec/struct.Vec.html) by selecting the feature `use_alloc`.
-If you select neither or both you'll get a compile error.
-
 ## Optional Features
 * `defmt`: you can enable the [`defmt`](https://defmt.ferrous-systems.com/) feature to get a `defmt::Format` implementation for all structs & enums and a `defmt::debug!` call for each command being parsed.
 * `rgb`: if enabled, `From<ColorEvent> for RGB8` is implemented to support the [RGB crate](https://crates.io/crates/rgb).
@@ -23,12 +17,16 @@ If you select neither or both you'll get a compile error.
   but you can opt to only select the event(s) you are interested in which will result in a small binary size.
   If other events are received, a `ProtocolParseError::DisabledControllerDataPackageType` will be returned.
 
+## Usage
+The entry point to use this crate is `Parser` which implements `Iterator` to access the events in the input.
+Note that this is a [sans I/O](https://sans-io.readthedocs.io/) crate, i.e. you have to talk to the Adafruit device, the parser just expects a byte sequence.
+
 ## Examples
 A simple example for the STM32F4 microcontrollers is [available](examples/stm32f4-event-printer/README.md).
 
 ## Changelog
 For the changelog please see the dedicated [CHANGELOG.md](CHANGELOG.md).
 
 ## Minimum Supported Rust Version (MSRV)
-This crate is guaranteed to compile on stable Rust 1.62 and up. It *might*
+This crate is guaranteed to compile on stable Rust 1.81 and up. It *might*
 compile with older versions but that may change in any new patch release.

examples/stm32f4-event-printer/Cargo.toml

@@ -17,7 +17,7 @@ defmt = "0.3.6"
 defmt-rtt = "0.4"
 
 # use `adafruit-bluefruit-protocol = "0.1"` in reality; path used here to ensure that the example always compiles against the latest master
-adafruit-bluefruit-protocol = { path = "../..", features = ["defmt", "use_heapless"] }
+adafruit-bluefruit-protocol = { path = "../..", features = ["defmt"] }
 
 [profile.release]
 codegen-units = 1

examples/stm32f4-event-printer/src/adafruit_bluefruit_le_uart_friend.rs

@@ -84,8 +84,10 @@ impl BluefruitLEUARTFriend {
             filled_buffer
         );
 
-        let event = adafruit_bluefruit_protocol::parse::<4>(filled_buffer);
-        defmt::info!("received event(s) over bluetooth: {}", &event);
+        let parser = adafruit_bluefruit_protocol::Parser::new(filled_buffer);
+        for event in parser {
+            defmt::info!("received event over bluetooth: {:?}", &event);
+        }
 
         // switch out the buffers
         filled_buffer.fill(0);

src/accelerometer_event.rs

@@ -3,7 +3,7 @@
 use super::{try_f32_from_le_bytes, ProtocolParseError};
 
 /// Represents an accelerometer event from the protocol.
-#[derive(PartialEq, Debug)]
+#[derive(PartialEq, Debug, Copy, Clone)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 #[allow(missing_docs)] // the names are already obvious enough

src/button_event.rs

@@ -1,9 +1,11 @@
 //! Implements the [`ButtonEvent`] and its parsing from the protocol.
 
 use super::ProtocolParseError;
+use core::error::Error;
+use core::fmt::{Display, Formatter};
 
 /// Errors which can be raised while parsing a button event.
-#[derive(PartialEq, Eq, Debug)]
+#[derive(PartialEq, Eq, Debug, Hash, Clone, Copy)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum ButtonParseError {
     /// The message contained an unknown button. For the known buttons see [`Button`].
@@ -12,8 +14,20 @@ pub enum ButtonParseError {
     UnknownButtonState(u8),
 }
 
+impl Display for ButtonParseError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
+        use ButtonParseError::*;
+        match self {
+            UnknownButton(button) => write!(f, "Unknown button: {:#x}", button),
+            UnknownButtonState(state) => write!(f, "Unknown button state: {:#x}", state),
+        }
+    }
+}
+
+impl Error for ButtonParseError {}
+
 /// Lists all possible buttons which can be sent in the event.
-#[derive(PartialEq, Eq, Debug)]
+#[derive(PartialEq, Eq, Debug, Copy, Clone, Hash)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[allow(missing_docs)] // the names are already obvious enough
 pub enum Button {
@@ -45,7 +59,7 @@ impl Button {
 }
 
 /// The state of the button.
-#[derive(PartialEq, Eq, Debug)]
+#[derive(PartialEq, Eq, Debug, Copy, Clone, Hash)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 #[allow(missing_docs)] // the names are already obvious enough
@@ -66,7 +80,7 @@ impl ButtonState {
 }
 
 /// Represents a button event from the protocol.
-#[derive(PartialEq, Eq, Debug)]
+#[derive(PartialEq, Eq, Debug, Copy, Clone, Hash)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[allow(missing_docs)] // the names are already obvious enough
 pub struct ButtonEvent {

src/color_event.rs

@@ -5,7 +5,7 @@ use super::ProtocolParseError;
 use rgb::RGB8;
 
 /// Represents a color event from the protocol.
-#[derive(PartialEq, Eq, Debug)]
+#[derive(PartialEq, Eq, Debug, Copy, Clone, Hash)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 #[allow(missing_docs)] // the names are already obvious enough

src/gyro_event.rs

@@ -3,7 +3,7 @@
 use super::{try_f32_from_le_bytes, ProtocolParseError};
 
 /// Represents a gyro event from the protocol.
-#[derive(PartialEq, Debug)]
+#[derive(PartialEq, Debug, Copy, Clone)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 #[allow(missing_docs)] // the names are already obvious enough