XCP UDP Data Acquisition

Select the name of XCP configuration that you want to use. This 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.

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

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.

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.

This parameter enables support for XCP data types and dimensions as defined in the ASAP2 standard. The Block Output Settings parameter selects whether the port outputs Compu method conversion values or raw values. The options provide:

These ASAP2 data types are supported by corresponding Simulink port data types:

The dimension support in the block accommodates the different treatment of matrices by MATLAB^® and the ECU. The MATLAB default operation treats matrices as row-major matrices. An XCP measurement can have a LAYOUT as COLUMN_DIR or ROW_DIR. If a matrix measurement is COLUMN_DIR, the blocks rearrange the measurement in memory and ensure 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.

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

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, which is the default. You can also specify a MATLAB variable for sample time. For information about simulation sample timing, see Timing in Hardware Interface Models.

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.