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perf(oled): skip I2C flush when the frame is unchanged

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The SH1106 path always pushed the full 1 KB buffer over I2C every endFrame,
even on static screens (clock, home) that don't change between updates. Hash
the GFX buffer (FNV-1a, no external dep — the CRC32 lib is only wired into
e-ink builds) and skip display.display() when it matches the last frame
pushed. _force_redraw forces a flush on the first frame and after
turnOn()/clear() so a post-wake or post-clear frame can't be wrongly skipped.

Mirrors the existing e-ink CRC-skip. Builds green: WioTrackerL1_companion_solo_dual.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Jakub
2026-07-05 22:40:01 +02:00
parent 9ee199e641
commit 4ae3d22654
2 changed files with 20 additions and 0 deletions
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14
src/helpers/ui/SH1106Display.cpp
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@@ -23,6 +23,7 @@ void SH1106Display::turnOn()
display.oled_commandList(pre, 2);
display.setContrast(_contrast);
_isOn = true;
_force_redraw = true; // panel was off — guarantee the next endFrame() flushes
}
void SH1106Display::turnOff()
@@ -35,6 +36,7 @@ void SH1106Display::clear()
{
display.clearDisplay();
display.display();
_force_redraw = true; // next endFrame() must flush even if its CRC matches a pre-clear frame
}
void SH1106Display::startFrame(Color bkg)
@@ -189,5 +191,17 @@ void SH1106Display::setBrightness(uint8_t level)
void SH1106Display::endFrame()
{
// Skip the I²C flush when the frame is byte-identical to the last one pushed.
// The most-shown screens (clock, home) are static between updates, so this
// cuts redundant display() traffic and a little power. FNV-1a over the 1 KB
// GFX buffer (~1k xor+mul, cheap); _force_redraw guarantees the first frame
// and the frame after wake/clear.
const uint8_t* buf = display.getBuffer();
uint16_t n = (uint16_t)((width() * height()) / 8);
uint32_t h = 2166136261u;
for (uint16_t i = 0; i < n; i++) { h ^= buf[i]; h *= 16777619u; }
if (!_force_redraw && h == _last_frame_hash) return;
_force_redraw = false;
_last_frame_hash = h;
display.display();
}

6
src/helpers/ui/SH1106Display.h
View File

@@ -23,6 +23,12 @@ class SH1106Display : public DisplayDriver
uint8_t _precharge;
bool _use_lemon = false;
int _text_sz;
// Frame-skip: endFrame() hashes the GFX buffer (FNV-1a, no external dep — the
// CRC32 lib is only wired into e-ink builds) and skips the I²C flush when it's
// byte-identical to the last one pushed. _force_redraw guarantees the first
// frame and the frame after turnOn()/clear() always flush.
uint32_t _last_frame_hash = 0;
bool _force_redraw = true;
bool i2c_probe(TwoWire &wire, uint8_t addr);
int16_t drawLemonChar(int16_t x, int16_t y, uint32_t cp);