CAN Write

R2026b

Write message to CAN network

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  • CAN Write

Libraries:
STM32 Microcontroller Blockset / (Legacy) STM32 MBED Based Boards / STM32H7

Description

The CAN Write block writes message to a Controller Area Network (CAN) network connected to the hardware.

Click View pin map on the block to open the Nucleo Pin Mapping table.

Specify the Data Format and its properties using the block parameters dialog box. Configure the properties of CAN module in the Configuration Parameters.

Note

CAN Write block is currently supported only for STM32 Nucleo H743ZI2.

Ports

Input

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The block accepts messages in Raw data or CAN Msg formats.

  • Raw data – To accept the message as a uint8 vector array, set Data is input as as Raw data.

  • CAN Msg – To accept the message in CAN message format, set Data is input as as CAN Msg. You can create your messages or you can upload a CAN database file.

Data Types: uint8 | CAN Msg

Output

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Output port to display the status of data transmission.

  • 1 - data transmission is successful

  • 0 - data transmission is unsuccessful

Dependencies

This port appears only when you select the Output Status parameter.

Parameters

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Module to which the CAN device is connected.

Note

  • CAN 0 Module on block represents CAN 1 peripheral on hardware.

  • CAN 1 Module on block represents CAN 2 peripheral on hardware.

Select a type to write message.

  • Raw data – To write message as a 1-by-N uint8 array, select Data Format as Raw data.

  • CAN Msg – To write message in CAN message format, select Data Format as CAN Msg and then perform these steps:

    1. Add a CAN pack block from Vehicle Network Toolbox™ to your model.

    2. Connect the output of the CAN Read pack block to the input of the CAN Write block

    3. Using the options in the Data to be input as list of the CAN Pack block, specify if you want to create your messages or you want to upload a CAN database file. If you choose to upload a CAN database file, the CAN Pack inherits the message properties from the uploaded file.

    Note

    To use the CAN Pack block, you must have a Vehicle Network Toolbox license.

The type of message identifier.

Dependencies

This parameter appears only when you select Data Format as Raw data.

Identifier, which is 11 bits long for the standard frame size or 29 bits long for the extended frame size, specified in decimal, binary, or hex. For binary and hex formats, use bin2dec(' ') and hex2dec(' '), respectively, to convert the entry. The identifier is coded into a message that is sent to the CAN bus.

Dependencies

This parameter appears only when you select Data Format as Raw data. To output the identifier of the CAN Msg, select Output identifier of the CAN Unpack block.

The length of the message, in bytes.

Dependencies

This parameter appears only when you select Data Format as Raw data. To output the length of the CAN Msg, select Output length of the CAN Unpack block.

The block sends a remote frame in the CAN message if this parameter is selected. The data at the input port is not sent in the CAN message.

Dependencies

This parameter appears only when you select Data Format as Raw data. For CAN Msg, the Remote Frame is inherited from the request specified in the CAN Pack block.

When you select the Output Status parameter, the block configures an output port, Status. The port outputs the status message.

Programmatic Use: Add Block

To add the block programmatically, use the add_block function with one of these library block paths as the source.

"stmnucleoh7lib/CAN Write"

Example: add_block("stmnucleoh7lib/CAN Write","myModel/myBlock",MakeNameUnique="on")

Extended Capabilities

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C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2020b

See Also

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