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
You can load the saved messages into MATLAB® for further analysis
or into another Simulink® model.
Note: If your model uses a National Instruments® device, you cannot connect CAN Receive block and CAN Log to the same channel on the device.
You cannot connect a channel on a National Instruments device to more than one block. Configure your CAN Log block to log from the Simulink input port. Refer to the Basic CAN Message Replay and Logging example for more information.
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
convert messages to the correct format. Refer to the Basic
CAN Message Replay and Logging example for information.
Note: You need a license for both Vehicle Network Toolbox™ and Simulink software to use this block.
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.
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.
Use the Block Parameters dialog box to configure your message logging.
Tip 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
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
CAN Bus or
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 from option.
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).