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perf(l2): the screen fades out and in in ~80 ms

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Jakub
2026-10-06 10:22:43 +02:00
co-authored by Claude Opus 5.5
parent 1b7402a33e
commit 999f88853a
1 changed files with 3 additions and 3 deletions
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variants/wio-tracker-l2/WioTrackerL2Display.h
+3 -3
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@@ -189,16 +189,16 @@ public:
class WioTrackerL2Display : public LGFXDisplay { class WioTrackerL2Display : public LGFXDisplay {
LGFX_WioTrackerL2 disp; LGFX_WioTrackerL2 disp;
// The backlight from one PWM level to another over ~180 ms, on a square // The backlight from one PWM level to another over ~80 ms, on a square
// curve (the eye sees the low end's steps). Blocks; 0 ends in standby. // curve (the eye sees the low end's steps). Blocks; 0 ends in standby.
void fade(uint8_t from, uint8_t to) { void fade(uint8_t from, uint8_t to) {
const int STEPS = 12; const int STEPS = 8;
for (int i = 1; i <= STEPS; i++) { for (int i = 1; i <= STEPS; i++) {
const int t = i * 256 / STEPS; // 0..256 const int t = i * 256 / STEPS; // 0..256
const int k = from < to ? t * t / 256 : 256 - (256 - t) * (256 - t) / 256; const int k = from < to ? t * t / 256 : 256 - (256 - t) * (256 - t) / 256;
const int v = from + ((int)to - from) * k / 256; const int v = from + ((int)to - from) * k / 256;
display->panel()->setBrightness((uint8_t)(i == STEPS ? to : (v < 1 ? 1 : v))); display->panel()->setBrightness((uint8_t)(i == STEPS ? to : (v < 1 ? 1 : v)));
delay(15); delay(8);
} }
} }