CAN: Introduce CAN FD Bitrate Switch (BRS)

QCanBusFrame:

Added hasBitrateSwitch and setBitrateSwitch to QCanBusFrame
and therefore, increased the QCanBusFrame version number.

* Setting QCanBusFrame::setBitrateSwitch(true)
  also sets QCanBusFrame::setFlexibleDataRateFormat(true)

* Setting QCanBusFrame::setFlexibleDataRateFormat(false)
  also sets QCanBusFrame::setBitrateSwitch(false)

QCanBusDevice:

Reference implementation and documentation are done for
the SocketCAN plugin. The CAN Example allows to send
frames with Bitrate Switch enabled and visualize received
frames with Bitrate Switch set.

Unfortunately, the SocketCAN plugin does not allow to change
any bitrate yet, so the newly added data bitrate selection
box in ConnectDialog seems a bit useless. This box is
however needed once other plugins become CAN FD capable and
implement bitrate switching.

[ChangeLog][QCanBusFrame] Introduced flag to allow data
bitrate switching for CAN FD frames. Reference
implementation is done for the SocketCAN plugin.

Task-number: QTBUG-56720
Change-Id: Ieab04020f4750c8b0085624d2250ad7cd982cd96
Reviewed-by: Rolf Eike Beer <eb@emlix.com>
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

1 files changed, 12 insertions, 0 deletions

diff --git a/examples/serialbus/can/connectdialog.cpp b/examples/serialbus/can/connectdialog.cpp
index 5d9e33d..920aeef 100644
--- a/examples/serialbus/can/connectdialog.cpp
+++ b/examples/serialbus/can/connectdialog.cpp
@@ -62,6 +62,8 @@ ConnectDialog::ConnectDialog(QWidget *parent) :
     m_ui->canFdBox->addItem(tr("false"), QVariant(false));
     m_ui->canFdBox->addItem(tr("true"), QVariant(true));
 
+    m_ui->dataBitrateBox->setFlexibleDateRateEnabled(true);
+
     connect(m_ui->okButton, &QPushButton::clicked, this, &ConnectDialog::ok);
     connect(m_ui->cancelButton, &QPushButton::clicked, this, &ConnectDialog::cancel);
     connect(m_ui->useConfigurationBox, &QCheckBox::clicked,
@@ -162,6 +164,9 @@ void ConnectDialog::revertSettings()
 
     value = configurationValue(QCanBusDevice::CanFdKey);
     m_ui->canFdBox->setCurrentText(value);
+
+    value = configurationValue(QCanBusDevice::DataBitRateKey);
+    m_ui->dataBitrateBox->setCurrentText(value);
 }
 
 void ConnectDialog::updateSettings()
@@ -218,5 +223,12 @@ void ConnectDialog::updateSettings()
         fdItem.first = QCanBusDevice::CanFdKey;
         fdItem.second = m_ui->canFdBox->currentData();
         m_currentSettings.configurations.append(fdItem);
+
+        // process data bitrate
+        const int dataBitrate = m_ui->dataBitrateBox->bitRate();
+        if (dataBitrate > 0) {
+            const ConfigurationItem item(QCanBusDevice::DataBitRateKey, QVariant(dataBitrate));
+            m_currentSettings.configurations.append(item);
+        }
     }
 }