CAN FD Configuration

Configure parameters for specified CAN FD device

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Libraries:
Vehicle Network Toolbox / CAN FD Communication

Description

The CAN FD Configuration block configures parameters for a CAN FD device that you can use to transmit and receive messages.

Specify the configuration of your CAN FD device before you configure other CAN FD blocks.

Use one CAN FD Configuration block to configure each device that sends and receives messages in your model. If you use a CAN FD Receive or a CAN FD Transmit block to receive and send messages on a device, your model checks to see if there is a corresponding CAN FD Configuration block for the specified device.

Note

You need a license for both Vehicle Network Toolbox™ and Simulink^® software to use this block.

Other Supported Features

The CAN FD Configuration block supports the use of Simulink accelerator mode. Using this feature, you can speed up the execution of Simulink models. For more information, see Acceleration (Simulink).

Examples

Get Started with CAN FD Communication in Simulink

Use MathWorks virtual CAN FD channels to set up transmission and reception of CAN FD messages in Simulink. The virtual channels are connected in a loopback configuration.

Open Live Script

Log and Replay CAN FD Messages

Log and replay CAN FD messages using MathWorks virtual CAN FD channels in Simulink. You can update this model to connect to supported hardware on your system.

Open Live Script

Parameters

Device — CAN device and channel

list option

Select the CAN FD device and a channel on the device that you want to use from the list. Use this device to transmit and/or receive messages. The device driver determines the default bus speed.

Programmatic Use

Block Parameter: Device

Type: character vector, string

Arbitration Bus speed — Arbitration bit rate

numeric

Set arbitration bus speed for the selected device, in bits per second. The default speed is assigned by the selected device.

Programmatic Use

Block Parameter: ArbitrationBusSpeed

Type: character vector, string

Values: integer

Data Bus speed — Data bit rate

numeric

Set data bus speed for the selected device, in bits per second. The default speed is assigned by the selected device.

Programmatic Use

Block Parameter: DataBusSpeed

Type: character vector, string

Values: integer

Bus frequency — PEAK-System bus rate

numeric

(PEAK-System only.) Set the bus frequency, in megahertz.

Programmatic Use

Block Parameter: BusFrequency

Type: character vector, string

Values: numeric

Arbitration/Data bit rate prescaler — Bit rate prescaler

integer

(PEAK-System only.) Set separate bit rate prescaler values for arbitration and data bit rates.

Programmatic Use

Block Parameter: ArbitrationPrescaler, DataPrescaler

Type: character vector, string

Values: integer

For Vector and PEAK-System devices, the next three parameters are available in two sets for manually setting bit parameters for data and arbitration bus speeds. For more information on these parameters, see Bit Timing.

Synchronization jump width — Maximum allowed time adjustment

integer

Specify the maximum limit of bit time adjustment in the case of resynchronization. The specified value must be a positive integer indicating a number of bit time quanta segments. If you do not specify a value, the selected bus speed setting determines the default value.

Programmatic Use

Block Parameter: ArbitrationSJW, DataSJW

Type: character vector, string

Values: integer

Time segment 1 — Number of time quanta before sample

integer

Specify the number of bit time quanta before the sampling point. The specified value must be a positive integer. Typically, an adjustment of this value is made with a corresponding inverse adjustment to Time segment 2 so that their sum remains constant. If you do not specify a value, the selected bus speed setting determines the default value.

Programmatic Use

Block Parameter: ArbitrationTSEG1, DataTSEG1

Type: character vector, string

Values: integer

Time segment 2 — Number of time quanta after sample

integer

Specify the number of bit time quanta after the sampling point. The specified value must be a positive integer. Typically, an adjustment of this value is made with a corresponding inverse adjustment to Time segment 1 so that their sum remains constant. If you do not specify a value, the selected bus speed setting determines the default value.

Programmatic Use

Block Parameter: ArbitrationTSEG2, DataTSEG2

Type: character vector, string

Values: integer

Verify bit parameter settings validity — Check validity of settings

If you have altered the bit parameter settings, click this button to see if your settings are valid. The block runs a check to see if the combination of your bus speed settings and the bit parameter values form a valid value for the device. If the new bit parameter values do not form a valid combination, the verification fails and displays an error message.

Programmatic Use

None

Acknowledge mode — Control channel activity on CAN bus

Normal (default) | Silent

Specify whether the channel is in Normal or Silent mode. By default Acknowledge mode is Normal. In this mode, the channel both receives and transmits messages normally and performs other tasks on the network such as acknowledging messages and creating error frames. To observe all message activity on the network and perform analysis, without affecting the network state or behavior, select Silent. In Silent mode, you can only receive messages and not transmit.

Programmatic Use

Block Parameter: AckMode

Type: character vector, string

Values: 'Normal' | 'Silent'

Default: 'Normal'

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

When used with the CAN FD Receive and CAN FD Transmit blocks, the CAN FD Configuration block supports code generation, but with limited portability that runs only on the host computer.

Version History

Introduced in R2018a