QGCParamWidget.cc

    int parametersSent = 0;
    QMap<int, QMap<QString, QVariant>*>::iterator i;
    for (i = changedValues.begin(); i != changedValues.end(); ++i) {
        // Iterate through the parameters of the component
        int compid = i.key();
        QMap<QString, QVariant>* comp = i.value();
        {
            QMap<QString, QVariant>::iterator j;
            for (j = comp->begin(); j != comp->end(); ++j) {
                setParameter(compid, j.key(), j.value());
                parametersSent++;
            }
        }
    }

    // Change transmission status if necessary
    if (parametersSent == 0) {
        statusLabel->setText(tr("No transmission: No changed values."));
    } else {
        statusLabel->setText(tr("Transmitting %1 parameters.").arg(parametersSent));
        // Set timeouts
        transmissionActive = true;
        quint64 newTransmissionTimeout = QGC::groundTimeMilliseconds() + (parametersSent/retransmissionBurstRequestSize+5)*rewriteTimeout;
        if (newTransmissionTimeout > transmissionTimeout) {
            transmissionTimeout = newTransmissionTimeout;
        }
        // Enable guard
        setRetransmissionGuardEnabled(true);
    }
}

/**
 * Write the current onboard parameters from RAM into
 * permanent storage, e.g. EEPROM or harddisk
 */
void QGCParamWidget::writeParameters()
{
    int changedParamCount = 0;

    QMap<int, QMap<QString, QVariant>*>::iterator i;
    for (i = changedValues.begin(); i != changedValues.end(); ++i)
    {
        // Iterate through the parameters of the component
        QMap<QString, QVariant>* comp = i.value();
        {
            QMap<QString, QVariant>::iterator j;
            for (j = comp->begin(); j != comp->end(); ++j)
            {
                changedParamCount++;
            }
        }
    }

    if (changedParamCount > 0)
    {
        QMessageBox msgBox;
        msgBox.setText(tr("There are locally changed parameters. Please transmit them first (<TRANSMIT>) or update them with the onboard values (<REFRESH>) before storing onboard from RAM to ROM."));
        msgBox.exec();
    }
    else
    {
        if (!mav) return;
        mav->writeParametersToStorage();
    }
}

void QGCParamWidget::readParameters()
{
    if (!mav) return;
    mav->readParametersFromStorage();
}

/**
 * Clear all data in the parameter widget
 */
void QGCParamWidget::clear()
{
    tree->clear();
    components->clear();
}