Method open

app/src/IO/Drivers/SlcanBackend.cpp:162–200

* @brief Opens the serial port and starts the slcan channel at the configured bitrate. */

 * @brief Opens the serial port and starts the slcan channel at the configured bitrate.
 */
bool IO::Drivers::SlcanBackend::open()
{
  const auto requested = configurationParameter(QCanBusDevice::BitRateKey).toUInt();
  const int index      = slcanBitrateIndex(requested == 0 ? 500000 : requested);
  if (index < 0) {
    setError(tr("The bitrate %1 bps is not a standard slcan rate.").arg(requested),
             QCanBusDevice::ConfigurationError);
    setState(QCanBusDevice::UnconnectedState);
    return false;
  }

  m_port = new QSerialPort(m_portName, this);
  m_port->setBaudRate(kSlcanBaudRate);

  if (!m_port->open(QIODevice::ReadWrite)) {
    setError(tr("Could not open serial port %1: %2").arg(m_portName, m_port->errorString()),
             QCanBusDevice::ConnectionError);
    m_port->deleteLater();
    m_port = nullptr;
    setState(QCanBusDevice::UnconnectedState);
    return false;
  }

  connect(m_port, &QSerialPort::readyRead, this, &SlcanBackend::onReadyRead);

  (void)sendCommand(QByteArrayLiteral("C\r"));
  (void)sendCommand("S" + QByteArray::number(index) + "\r");
  if (!sendCommand(QByteArrayLiteral("O\r"))) {
    setError(tr("Failed to open the slcan channel."), QCanBusDevice::ConnectionError);
    m_port->close();
    m_port->deleteLater();
    m_port = nullptr;
    setState(QCanBusDevice::UnconnectedState);
    return false;
  }

  setState(QCanBusDevice::ConnectedState);
  return true;
}

/**
 * @brief Closes the slcan channel and the serial port.