swaitsandClaude Opus 4.6
3102fc747a
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>
static-cell
Statically allocated, initialized at runtime cell.
StaticCell provides a no-std-compatible, no-alloc way to reserve memory at compile time for
a value, but initialize it at runtime, and get a 'static reference to it.
This is useful in the following scenarios:
- You need
&'static T, butTcan't be constructed in const context so you can't simply use astatic. - You need
&'static mut T, not just&'static T.
Example
use static_cell::StaticCell;
// Statically allocate memory for a `u32`.
static SOME_INT: StaticCell<u32> = StaticCell::new();
// Initialize it at runtime. This returns a `&'static mut`.
let x: &'static mut u32 = SOME_INT.init(42);
assert_eq!(*x, 42);
// Trying to call `.init()` again would panic, because the StaticCell is already initialized.
// SOME_INT.init(42);
Alternatives
- If you can use
alloc, you can useBox::leak(). - If you're OK with
unsafe, you can usestatic mut THING: MaybeUninit<T>. - If you need just
&'static T(instead of&'static mut T), there'sOnceCell(not thread-safe though) orOnceLock(thread-safe, but requiresstd).
Interoperability
This crate uses portable-atomic, so on targets without native
atomics you must import a crate that provides a critical-section
implementation. See the critical-section README for details.
Minimum Supported Rust Version (MSRV)
This crate is guaranteed to compile on stable Rust 1.56 and up. It might compile with older versions but that may change in any new patch release.
License
This work is licensed under either of
- Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license (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.