Method close

app/src/IO/Drivers/USB.cpp:244–266

* @brief Closes the device, tears down all active transfers, and stops the read thread. The * QThread::started connections are detached here so the next open() cycle re-wires exactly one * read slot instead of double-connecting. */

 * read slot instead of double-connecting.
 */
void IO::Drivers::USB::close()
{
  Q_ASSERT(m_ctx != nullptr);
  Q_ASSERT(m_activeInEp != 0 || m_handle == nullptr);

  stopReadThread();
  cancelAndDrainTransfers();
  freeTransfers();

  disconnect(&m_readThread, &QThread::started, this, &USB::readLoop);
  disconnect(&m_readThread, &QThread::started, this, &USB::isoReadLoop);

  if (m_handle) {
    releaseInterface();
    libusb_close(m_handle);
    m_handle = nullptr;
  }

  m_activeInEp  = 0;
  m_activeOutEp = 0;

  Q_EMIT configurationChanged();
}

/**
 * @brief Returns true when a USB device handle is open.