Method write

app/src/IO/Drivers/USB.cpp:304–323

* @brief Sends @p data to the device via a synchronous bulk OUT transfer. A mutable copy of * @p data is required because libusb takes a non-const buffer and may write into it. */

 * @p data is required because libusb takes a non-const buffer and may write into it.
 */
qint64 IO::Drivers::USB::write(const QByteArray& data)
{
  Q_ASSERT(!data.isEmpty());
  Q_ASSERT(m_handle != nullptr);

  if (!isWritable())
    return -1;

  int transferred = 0;
  QByteArray mutableData(data);
  auto* buf = reinterpret_cast<unsigned char*>(mutableData.data());

  const int rc = libusb_bulk_transfer(
    m_handle, m_activeOutEp, buf, static_cast<int>(data.size()), &transferred, kBulkWriteTimeout);
  if (rc < 0)
    return -1;

  Q_EMIT dataSent(data.left(transferred));
  return static_cast<qint64>(transferred);
}

//--------------------------------------------------------------------------------------------------
// Property getters