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Add async display refresh to overlap CPU work

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Introduces non-blocking display refresh methods that allow CPU work (like grayscale rendering) to overlap with the e-ink panel's refresh time. The async path starts the waveform and returns immediately, with the caller responsible for waiting via waitRefreshComplete(). Falls back to blocking refresh when fadingFix is enabled or the panel lacks deferral support.
This commit is contained in:
Justin Mitchell
2026-07-14 04:42:27 -04:00
parent 34e7ed249b
commit 17e4230068
6 changed files with 166 additions and 38 deletions
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lib/hal/HalDisplay.h
+11
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@@ -39,6 +39,17 @@ class HalDisplay {
bool fromProgmem = false) const;
void displayBuffer(RefreshMode mode = RefreshMode::FAST_REFRESH, bool turnOffScreen = false);
// Non-blocking refresh (shadow-free): starts the panel waveform and returns
// while the panel refreshes on its own. The framebuffer must stay untouched
// until waitRefreshComplete(), and the caller must rebuild the differential
// baseline before the next differential update (the tiled grayscale cleanup
// does). Panels without deferral fall back to a blocking refresh.
void displayBufferAsync(RefreshMode mode = RefreshMode::FAST_REFRESH);
// Block until a pending deferred refresh completes (no-op when none is).
void waitRefreshComplete();
// True when displayBufferAsync() genuinely overlaps (panel driver defers);
// false where it falls back to a blocking refresh.
bool supportsAsyncRefresh() const;
void refreshDisplay(RefreshMode mode = RefreshMode::FAST_REFRESH, bool turnOffScreen = false);
// Power management