Log received CAN messages
Vehicle Network Toolbox: CAN Communication
The CAN Log block logs CAN messages from the CAN network or messages sent to
the blocks input port to a
.mat file. You can load the saved messages into
MATLAB® for further analysis or into another Simulink® model.
Configure your CAN Log block to log from the Simulink input port. For more information, see Log and Replay CAN Messages.
The Log block appends the specified filename with the current date and time, creating unique log files for repeated logging.
If you want to use messages logged using Simulink blocks in the MATLAB Command window, use
canMessage to convert messages to the correct
You need a license for both Vehicle Network Toolbox™ and Simulink software to use this block.
You cannot have more than one CAN Log block in a model using the same PEAK-System device channel.
The CAN Log block supports the use of Simulink Accelerator™ and Rapid Accelerator mode. Using this feature, you can speed up the execution of Simulink models. For more information on this feature, see the Simulink documentation.
The CAN Log block supports the use of code generation along with the packNGo function to group required source code and dependent shared libraries. For more information, see Code Generation.
Vehicle Network Toolbox Simulink blocks allow you to generate code, enabling models containing these blocks to run in Accelerator, Rapid Accelerator, External, and Deployed modes.
You can use Vehicle Network Toolbox, Simulink Coder™, and Embedded Coder® software together to generate code on the host end that you can use to implement your model. For more information on code generation, see Build Process (Simulink Coder).
The block generates code with limited portability. The block
uses precompiled shared libraries, such as DLLs, to support I/O for
specific types of devices. With this block, you can use the
supported by Simulink
Coder to set up and manage the build
information for your models. The
allows you to package model code and dependent shared libraries into
a zip file for deployment. You do not need MATLAB installed on
the target system, but the target system needs to be supported by MATLAB.
To set up
In this example,
gcs is the current model
that you want to build. Building the model creates a zip file with
the same name as model name. You can move this zip file to another
machine and there build the source code in the zip file to create
an executable which can run independent of MATLAB and Simulink.
The generated code compiles with both C and C++ compilers. For more
information, see Build Process Customization (Simulink Coder).
On Linux® platforms, you need to add the folder where you unzip the libraries to
the environment variable
If you are logging from the network, you need to configure your CAN channel with a CAN Configuration block.
Type the name and path of the file to log CAN messages to, or click Browse to browse to a file location.
The model appends the log file name with the current date and time in the
YYYY-MMM-DD_hhmmss format. You can also open the block mask and specify a
unique name to differentiate between your files for repeated logging.
Type the variable saved in the MAT-file that holds the CAN message information.
Specify the maximum number of messages this block can log from the selected device or
port. The specified value must be a positive integer. If you do not specify a value the block
uses the default value of
10,000 messages. The log file saves the most
recent messages up to the specified maximum number.
Select the source of the messages logged by the block. Possible values are
Input port. To log messages from the network, you must
specify a device.
Select the device on the CAN network that you want to log messages from. This filed is
unavailable if you select
Input port for Log messages
Specify the sampling time of the block during simulation, which is the simulation time as described by the Simulink documentation. This value defines the frequency at which the CAN Log block runs during simulation. If the block is inside a triggered subsystem or to inherit sample time, you can specify –1 as your sample time. You can also specify a MATLAB variable for sample time. The default value is 0.01 (in seconds).