Function setup

src/main.cpp:305–481

}

void setup() {
  t1 = millis();

#ifdef ENABLE_SERIAL_LOG
  // Earliest possible Serial setup. The 250 ms stall before begin() lets the
  // USB Serial/JTAG peripheral finish power-on and lets the host complete USB
  // enumeration before we touch the CDC state — otherwise cold boot races
  // and the host has to be physically replugged for logs to flow. Warm reboot
  // worked without the delay because USB was already enumerated.
  delay(250);
  Serial.begin(115200);
  logSerial.setTxTimeoutMs(1);  // This is a load-bearing 1. Do not modify.
#endif

  HalSystem::begin();

  // Read-and-clear so a panic later in setup() doesn't loop into silent reboot.
  // Bound the target range too — RTC_NOINIT memory is uninitialized on cold boot.
  const bool isSilentReboot = (silentRebootMagic == SILENT_REBOOT_MAGIC);
  const uint32_t snapshotTarget =
      (isSilentReboot && silentRebootTarget <= SILENT_REBOOT_TARGET_READER) ? silentRebootTarget : 0;
  silentRebootMagic = 0;
  silentRebootTarget = 0;

  gpio.begin();
  powerManager.begin();
  halTiltSensor.begin();
  halClock.begin();

  LOG_INF("MAIN", "Hardware detect: %s", gpio.deviceIsX3() ? "X3" : "X4");

  // SD Card Initialization
  // We need 6 open files concurrently when parsing a new chapter
  if (!Storage.begin()) {
    LOG_ERR("MAIN", "SD card initialization failed");
    setupDisplayAndFonts(isSilentReboot);
    activityManager.goToFullScreenMessage("SD card error", EpdFontFamily::BOLD);
    return;
  }

  HalSystem::checkPanic();

  SETTINGS.loadFromFile();
  APP_STATE.loadFromFile();
  RECENT_BOOKS.loadFromFile();
  I18N.setLanguage(static_cast<Language>(SETTINGS.language));
  KOREADER_STORE.loadFromFile();
  OPDS_STORE.loadFromFile();
  UITheme::getInstance().reload();
  ButtonNavigator::setMappedInputManager(mappedInputManager);

  const auto wakeupReason = gpio.getWakeupReason();
  switch (wakeupReason) {
    case HalGPIO::WakeupReason::PowerButton:
      LOG_DBG("MAIN", "Verifying power button press duration");
      gpio.verifyPowerButtonWakeup(SETTINGS.getPowerButtonDuration(),
                                   SETTINGS.shortPwrBtn == CrossPointSettings::SHORT_PWRBTN::SLEEP);
      break;