Method loop

src/modules/others/timer.cpp:142–202

}

void Timer::loop() {
    unsigned long startMillis = millis();
    unsigned long lastUpdateMillis = 0;

    int lastSeconds = -1; // Track last displayed value to avoid unnecessary redraws
    char timeString[12];

    tft.fillScreen(bruceConfig.bgColor);

    // Countdown loop
    while (true) {
        unsigned long currentMillis = millis();

        // Calculate elapsed time (handles millis() overflow correctly)
        unsigned long elapsedMillis = currentMillis - startMillis;

        // Check for ESC/BACK button - exit timer
        if (check(EscPress)) { break; }

        // Check if timer has completed
        if (elapsedMillis >= duration) {
            // Play alarm pattern only if enabled
            if (playSoundOnFinish) { playAlarmPattern(); }
            break;
        }

        // Update display only once per second to reduce flicker and CPU usage
        if (currentMillis - lastUpdateMillis >= DISPLAY_UPDATE_INTERVAL) {
            unsigned long remainingMillis = duration - elapsedMillis;

            int seconds = (remainingMillis / 1000) % 60;
            int minutes = (remainingMillis / 60000) % 60;
            int hours = (remainingMillis / 3600000) % 100;

            // Only redraw if the seconds value changed
            if (seconds != lastSeconds) {
                snprintf(timeString, sizeof(timeString), "%02d:%02d:%02d", hours, minutes, seconds);

                // Calculate optimal font size based on display width
                uint8_t f_size = 4;
                for (uint8_t i = 4; i > 0; i--) {
                    if (i * LW * 8 < (tftWidth - BORDER_PAD_X * 2)) {
                        f_size = i;
                        break;
                    }
                }

                drawMainBorder(false);
                tft.setTextSize(f_size);
                tft.setTextColor(bruceConfig.priColor, bruceConfig.bgColor);
                tft.drawCentreString(timeString, timerX, timerY, 1);

                lastSeconds = seconds;
            }

            lastUpdateMillis = currentMillis;
        }