Use the Reference Image
You can use the reference image to understand how to build a system using the Sensor Framework for QNX SDP or to experiment with sample applications.
-
Use it as a test and development platform. You can develop and run applications using the Sensor Framework.
For example, you may have an application and simply need a hardware platform
to perform testing. For more information, see
Connect to the reference image
in this chapter. -
Evaluate the type of features that can run on the hardware platform. You can run
applications that come with the reference image to see how features respond.
For more information, see
Run sample applications
. -
Evaluate how the platform works with different sensors and cameras. You can
connect different sensors and cameras and configure the image to use live data from one of
these connected devices. For more information, see
Connect cameras and sensors
.
Supported hardware configurationsin the
About the Sensor Frameworkchapter of this guide.
Configuration files
The following reference image configuration files let the system know what sensors and cameras are connected:
- Sensor configuration files
- The default file is located at /etc/system/config/cogent_surround_cameras.conf. It configures an RDACM24 camera that's connected to the system.
- System Launch Configuration (SLM) file
- The main SLM file is located at /etc/slm-config-all.xml. It pulls specific configuration from the /etc/slm-config-platform.xml file. There are other SLM files in the /etc directory that you can use to change the configuration easily.
For information about how to change the configuration, see Configure cameras and sensors on the reference image
in this chapter.
Sample applications on the reference image
The reference image includes sample applications. The applications described in this guide are the ones that
function on the reference image with predefined configurations. For more information about the applications
and how to use them on this reference image, see Run sample applications
in this chapter.
Understanding the reference image
The reference image is configured to be an example you can refer to when you build your image. The following is a list of things we have done to make the reference image easier to use, but you may want to change in your final image:
- Filesystem is writable
-
The filesystem that's mounted for the reference image is initially read-only. For a
production system, you usually want to boot it as read-only. To modify or create new files on the
filesystem, run the following command on the target to remount the filesystem and make it writable:
mount -uw /base - qconn
- When you want to use the QNX Momentics IDE to connect to your target, the qconn service must be started on the target. The IDE is a useful tool to simplify the process of uploading binaries to the target board, downloading files from your host, and modifying configuration files on the reference image. The qconn service is included with the reference image and should be run only on developer images, not production images.