feat: add display UI with splash screen, dashboard, and RSSI sparkline

Implement full SSD1306 OLED display support:
- Splash screen on boot (1.5s) with project name, version, board
- Dashboard showing radio state, config, counters, RSSI/SNR
- RSSI history sparkline (64-sample ring buffer, 2px-wide bars)
- DisplayOn/DisplayOff host commands routed via dedicated channel
- Pure render functions against generic DrawTarget (no hardware coupling)
- Display on/off control bypasses radio task entirely

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

vendor/display-interface/.cargo-checksum.json

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vendor/display-interface/.cargo_vcs_info.json

@@ -0,0 +1,6 @@
+{
+  "git": {
+    "sha1": "b7eb1d0fe4bd995f3dc8d3f5bdccdba4216cc63f"
+  },
+  "path_in_vcs": ""
+}

vendor/display-interface/.github/workflows/ci.yml

@@ -0,0 +1,31 @@
+on:
+  push:
+    branches: [ staging, trying, master ]
+  pull_request:
+
+name: Continuous integration
+jobs:
+  ci_check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: build
+      - uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --package display-interface-spi
+      - uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --package display-interface-i2c
+      - uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --package display-interface-parallel-gpio

vendor/display-interface/.github/workflows/clippy.yml

@@ -0,0 +1,32 @@
+on:
+  push:
+    branches: [ staging, trying, master ]
+  pull_request:
+
+name: Clippy check
+jobs:
+  clippy_check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: clippy
+      - uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+      - uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --package display-interface-spi
+      - uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --package display-interface-i2c
+      - uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --package display-interface-parallel-gpio

vendor/display-interface/.github/workflows/rustfmt.yml

@@ -0,0 +1,23 @@
+on:
+  push:
+    branches: [ staging, trying, master ]
+  pull_request:
+
+name: Code formatting check
+
+jobs:
+  fmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: rustfmt
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check

vendor/display-interface/CHANGELOG.md

@@ -0,0 +1,95 @@
+# Change Log
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## [Unreleased]
+
+## Added
+
+- Updated to embedded-hal 1.0.0 and embedded-hal-async 1.0.0
+- New `AsyncWriteOnlyDataCommand` trait.
+- i2c, spi: `async/await` support.
+- parallel-gpio: Added `Generic16BitBus`
+- parallel-gpio: Added `PGPIO16BitInterface`
+- added `defmt-03` feature
+
+## Changed
+
+- **Breaking** raised MSRV to 1.75
+- spi: `SPIInterface` now wraps objects that implement the `SpiDeviceWrite` trait from embedded-hal 1.0.0
+- spi: `SPIInterface` now wraps objects that implement the `SpiDeviceWrite` trait from embedded-hal-async 1.0.0
+- parallel-gpio: Fixed bug with fallible pins
+- **Breaking** parallel-gpio: `GenericxBitBus::new` is now infallible
+
+## [v0.4.1] - 2021-05-10
+
+### Added
+
+- New `DisplayError` variant `RSError` to use with problems with the display's reset signal
+- New `DisplayError` variant `OutOfBoundsError` to use when writing to a non-existing pixel outside the display's bounds
+- parallel-gpio (0.5.0): New `OutputBus` trait
+- parallel-gpio (0.5.0): Added `Generic8BitBus`, an implementation of `OutputBus`
+
+### Changed
+
+- Return `DCError` instead of `BusWriteError` on errors (de-)asserting the DC signal in 8-bit GPIO interfaces
+- **Breaking** parallel-gpio (0.5.0): `PGPIO8BitInterface` now uses any 8-bit impementation of `OutputBus` instead of 8 individual pins
+
+## [v0.4.0] - 2020-05-25
+
+### Added
+
+- Support for 8bit and 16bit iterators as data format
+- Support for 16bit slice data format with target endian
+- Deconstructors for included display-interface implementations
+
+### Changed
+
+- Make enums non-exhaustive and added a DataFormatNotImplemented fallback error
+
+## [v0.3.0] - 2020-05-11
+
+### Added
+
+- 16 bit data width support for 8 bit parallel-gpio and SPI impls
+
+### Changed
+
+- Data width is provided via custom enum (breaking change)
+
+## [v0.2.1] - 2020-04-16
+
+### Added
+
+- Added prelude
+
+## [v0.2.0] - 2020-04-01
+
+### Changed
+
+- Made data width generic (breaking change)
+
+## [v0.1.1] - 2020-03-29
+
+### Fixed
+
+- Crate metadata
+
+### Removed
+
+- Examples requiring additional driver crates
+
+## 0.1.0 - 2020-03-29
+
+First version
+
+[Unreleased]: https://github.com/therealprof/display-interface/compare/v0.4.1...HEAD
+[v0.4.1]: https://github.com/therealprof/display-interface/compare/v0.4.0...v0.4.1
+[v0.4.0]: https://github.com/therealprof/display-interface/compare/v0.3.0...v0.4.0
+[v0.3.0]: https://github.com/therealprof/display-interface/compare/v0.2.1...v0.3.0
+[v0.2.1]: https://github.com/therealprof/display-interface/compare/v0.2.0...v0.2.1
+[v0.2.0]: https://github.com/therealprof/display-interface/compare/v0.1.1...v0.2.0
+[v0.1.1]: https://github.com/therealprof/display-interface/compare/v0.1.0...v0.1.1

vendor/display-interface/Cargo.toml

@@ -0,0 +1,40 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2021"
+rust-version = "1.75"
+name = "display-interface"
+version = "0.5.0"
+authors = ["Daniel Egger <daniel@eggers-club.de>"]
+exclude = [".gitignore"]
+description = "Traits for interfaces used to drive displays"
+documentation = "https://docs.rs/display-interface"
+readme = "README.md"
+keywords = [
+    "graphics",
+    "display",
+    "embedded",
+]
+categories = ["no-std"]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/therealprof/display-interface"
+
+[package.metadata.docs.rs]
+all-features = true
+
+[dependencies.defmt]
+version = "0.3"
+optional = true
+
+[features]
+default = []
+defmt-03 = ["dep:defmt"]

vendor/display-interface/LICENSE-APACHE

@@ -0,0 +1,201 @@
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vendor/display-interface/LICENSE-MIT

@@ -0,0 +1,25 @@
+Copyright (c) 2018 James Waples
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

vendor/display-interface/README.md

@@ -0,0 +1,28 @@
+# Display interface
+
+This Rust crate contains a `no_std` compatible interface in form of traits to
+bridge between a bus driver and a display driver. The goal here is to allow
+display drivers to be written in a hardware interface agnostic way and prevent
+code duplication and missing implementations.
+
+## Crate features
+
+Additional features can be enabled by adding the following features to your Cargo.toml.
+
+ - `defmt-03`: implements `defmt::Format` for `DisplayError`.
+
+## License
+
+Licensed under either of
+
+- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
+  http://www.apache.org/licenses/LICENSE-2.0)
+- MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the
+work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any
+additional terms or conditions.

vendor/display-interface/src/lib.rs

@@ -0,0 +1,76 @@
+//! A generic display interface
+//!
+//! This crate contains an error type and traits to implement for bus interface drivers drivers to
+//! be consumed by display drivers. It abstracts over the different communication methods available
+//! to drive a display and allows a driver writer to focus on driving the display itself and only
+//! have to implement a single interface.
+
+#![no_std]
+#![allow(async_fn_in_trait)]
+
+pub mod prelude;
+
+/// A ubiquitous error type for all kinds of problems which could happen when communicating with a
+/// display
+#[derive(Clone, Debug)]
+#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[non_exhaustive]
+pub enum DisplayError {
+    /// Invalid data format selected for interface selected
+    InvalidFormatError,
+    /// Unable to write to bus
+    BusWriteError,
+    /// Unable to assert or de-assert data/command switching signal
+    DCError,
+    /// Unable to assert chip select signal
+    CSError,
+    /// The requested DataFormat is not implemented by this display interface implementation
+    DataFormatNotImplemented,
+    /// Unable to assert or de-assert reset signal
+    RSError,
+    /// Attempted to write to a non-existing pixel outside the display's bounds
+    OutOfBoundsError,
+}
+
+/// DI specific data format wrapper around slices of various widths
+/// Display drivers need to implement non-trivial conversions (e.g. with padding)
+/// as the hardware requires.
+#[non_exhaustive]
+pub enum DataFormat<'a> {
+    /// Slice of unsigned bytes
+    U8(&'a [u8]),
+    /// Slice of unsigned 16bit values with the same endianness as the system, not recommended
+    U16(&'a [u16]),
+    /// Slice of unsigned 16bit values to be sent in big endian byte order
+    U16BE(&'a mut [u16]),
+    /// Slice of unsigned 16bit values to be sent in little endian byte order
+    U16LE(&'a mut [u16]),
+    /// Iterator over unsigned bytes
+    U8Iter(&'a mut dyn Iterator<Item = u8>),
+    /// Iterator over unsigned 16bit values to be sent in big endian byte order
+    U16BEIter(&'a mut dyn Iterator<Item = u16>),
+    /// Iterator over unsigned 16bit values to be sent in little endian byte order
+    U16LEIter(&'a mut dyn Iterator<Item = u16>),
+}
+
+/// This trait implements a write-only interface for a display which has separate data and command
+/// modes. It is the responsibility of implementations to activate the correct mode in their
+/// implementation when corresponding method is called.
+pub trait WriteOnlyDataCommand {
+    /// Send a batch of commands to display
+    fn send_commands(&mut self, cmd: DataFormat<'_>) -> Result<(), DisplayError>;
+
+    /// Send pixel data to display
+    fn send_data(&mut self, buf: DataFormat<'_>) -> Result<(), DisplayError>;
+}
+
+/// This trait implements a write-only interface for a display which has separate data and command
+/// modes. It is the responsibility of implementations to activate the correct mode in their
+/// implementation when corresponding method is called.
+pub trait AsyncWriteOnlyDataCommand {
+    /// Send a batch of commands to display
+    async fn send_commands(&mut self, cmd: DataFormat<'_>) -> Result<(), DisplayError>;
+
+    /// Send pixel data to display
+    async fn send_data(&mut self, buf: DataFormat<'_>) -> Result<(), DisplayError>;
+}

vendor/display-interface/src/prelude.rs

@@ -0,0 +1,3 @@
+pub use crate::AsyncWriteOnlyDataCommand as _display_interface_AsyncWriteOnlyDataCommand;
+pub use crate::DisplayError as _display_interface_DisplayError;
+pub use crate::WriteOnlyDataCommand as _display_interface_WriteOnlyDataCommand;