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>
57 lines
2.2 KiB
Rust
57 lines
2.2 KiB
Rust
use core::mem;
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use core::task::Waker;
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/// Utility struct to register and wake a waker.
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/// If a waker is registered, registering another waker will replace the previous one.
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/// The previous waker will be woken in this case, giving it a chance to reregister itself.
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/// Although it is possible to wake multiple tasks this way,
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/// this will cause them to wake each other in a loop registering themselves.
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#[derive(Debug, Default)]
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pub struct WakerRegistration {
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waker: Option<Waker>,
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}
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impl WakerRegistration {
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/// Create a new `WakerRegistration`.
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pub const fn new() -> Self {
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Self { waker: None }
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}
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/// Register a waker. Overwrites the previous waker, if any.
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pub fn register(&mut self, w: &Waker) {
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match self.waker {
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// Optimization: If both the old and new Wakers wake the same task, we can simply
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// keep the old waker, skipping the clone. (In most executor implementations,
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// cloning a waker is somewhat expensive, comparable to cloning an Arc).
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Some(ref w2) if (w2.will_wake(w)) => {}
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_ => {
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// clone the new waker and store it
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if let Some(old_waker) = mem::replace(&mut self.waker, Some(w.clone())) {
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// We had a waker registered for another task. Wake it, so the other task can
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// reregister itself if it's still interested.
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//
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// If two tasks are waiting on the same thing concurrently, this will cause them
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// to wake each other in a loop fighting over this WakerRegistration. This wastes
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// CPU but things will still work.
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//
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// If the user wants to have two tasks waiting on the same thing they should use
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// a more appropriate primitive that can store multiple wakers.
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old_waker.wake()
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}
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}
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}
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}
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/// Wake the registered waker, if any.
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pub fn wake(&mut self) {
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if let Some(w) = self.waker.take() {
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w.wake()
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}
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}
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/// Returns true if a waker is currently registered
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pub fn occupied(&self) -> bool {
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self.waker.is_some()
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}
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}
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