perf(DisplayDriverTFT): Throttle alert redraws to prevent tearing

2026-02-20 02:41:04 -08:00
parent ba8789797c
commit b68d36bb85
2 changed files with 11 additions and 1 deletions
--- a/boards/esp32-32e-4/DisplayDriverTFT.cpp
+++ b/boards/esp32-32e-4/DisplayDriverTFT.cpp
@@ -193,8 +193,16 @@ void DisplayDriverTFT::drawBoot(const ScreenState& st) {
 }

 void DisplayDriverTFT::drawAlert(const ScreenState& st) {
+    // Throttle redraws to ~24fps to prevent tearing
+    uint32_t now = millis();
+    if(now - _lastAlertDrawMs < ALERT_DRAW_INTERVAL_MS) {
+        return;
+    }
+    _lastAlertDrawMs = now;
+
    uint32_t elapsed = millis() - st.alertStartMs;
-    uint8_t pulse = 180 + (uint8_t)(75.0f * sinf(elapsed / 300.0f));
+    // Slower pulse - divide by 1500 for ~9.4 second cycle (was 300 for ~1.9s)
+    uint8_t pulse = 180 + (uint8_t)(75.0f * sinf(elapsed / 1500.0f));
    uint16_t bg = _tft.color565(pulse, 0, 0);

    _tft.fillScreen(bg);