XCP UDP Data Acquisition

Acquire selected measurements from configured slave connection

  • Library:
  • Simulink Real-Time / XCP / UDP

    Vehicle Network Toolbox / XCP Communication / UDP


The XCP UDP Data Acquisition block acquires data from the configured slave connection based on the selected measurements. The block uses the XCP UDP transport layer to obtain raw data for the selected measurements at the specified simulation time step. Configure your XCP connection and use the XCP UDP Data Acquisition block to select your event and measurements for the configured slave connection. The block displays the selected measurements as output ports.

Other Supported Features

The XCP communication blocks support the use of Simulink® accelerator mode and rapid accelerator mode. Using this feature, you can speed up the execution of Simulink models. For more information on these simulation modes, see the Simulink documentation.

The XCP communication blocks support code generation with limited deployment capabilities. Code generation requires the Microsoft® C++ compiler.


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Select the name of XCP configuration you want to use. The list displays all available names specified in the XCP UDP Configuration blocks in the model. Selecting a configuration displays events and measurements available in the A2L file of this configuration .


You can acquire measurements for only one event by using an XCP UDP Data Acquisition block. Use one block for each event whose measurements you want to acquire.

Programmatic Use


Select an event from the available list of events. The XCP UDP Configuration block uses the specified A2L file to populate the events list.

Programmatic Use


This list displays all measurements available for the selected event. Select the measurement that you want to use and click the add button, to add it to the selected measurements. Hold the Ctrl key on your keyboard to select multiple measurements.

In the Block Parameters dialog box, type the name of the measurement you want to use in the Search box. The All Measurements lists displays a list of all matching names. Click the x

to clear your search.

Programmatic Use


This list displays selected measurements. To remove a measurement from this list, select the measurement and click the remove button, .

In the Block Parameters dialog box, use the toggle buttons to reorder the selected measurements.

Programmatic Use


This parameter enables support for XCP data types and dimensions as defined in the ASAP2 standard. When the parameter value is set to 'on', the block:

  • Sets the port data type according to the type definition in the A2L file

  • Supports up to three-dimensional XCP measurements in Simulink

These ASAP2 data types are supported by corresponding Simulink port data types. SBYTE, UWORD, SWORD, ULONG, SLONG , A_UINT64, A_INT64, FLOAT32_IEEE, and FLOAT64_IEEE.

The dimension support in the block accommodates the different treatment of matrices by MATLAB® and the ECU. MATLAB default operation treats matrices as row-major. An XCP measurement can have LAYOUT as COLUMN_DIR or ROW_DIR . If a matrix measurement is COLUMN_DIR, the blocks rearranges the measurement in memory and ensures that the matrix (row X, col Y) in MATLAB refers to the same entry as (row X, col Y) on the ECU. The rearrangement causes matrix entries that are contiguous on the ECU to be noncontiguous in MATLAB and Simulink.

Programmatic Use


Specify a priority value as an integer from 0 to 255 for the slave device driver to prioritize transmission of data packets. The slave can accumulate XCP packets for lower priority DAQ lists before transmission to the master. A value of 255 has the highest priority. The SET_DAQ_LIST_MODE command communicates the DAQ List Priority value from master to slave. This communication method differs from the specification of the Event Channel Priority property, which comes from the A2L file.

Programmatic Use


Specify the sampling time of the block during simulation, which is the simulation time. This value defines the frequency at which the XCP UDP Data Acquisition block runs during simulation. If the block is inside a triggered subsystem or is 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).

Programmatic Use


When the Timestamp is enabled, the block reads the timestamp from incoming DTO packets and outputs the timestamp to Simulink. The Enable Timestamp check box appears in the block parameters dialog box when the parameter is supported in the A2L file.

Programmatic Use


Introduced in R2019a