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External mode event trigger



errorCode = extmodeEvent(eventId, simulationTime) informs the external mode abstraction layer of the occurrence of an event.

eventId is the sample time ID of the model, for example, 0 for base rate, 1 for first subrate, and so on.

The function:

  • Samples all signals associated with a given sample time.

  • Stores signal values in a new packet buffer.

  • Passes the packet buffer to the underlying transport layer for subsequent transmission to the development computer.

Use this function with other external mode functions to enable communication between Simulink® and the target application during an external mode simulation.

For correct sampling of signal values, run the function immediately after model_step() for the corresponding sample time ID. You can invoke the function with different sample time IDs in separate threads because the function is thread-safe.

The extmodeBackgroundRun function performs the transmission of signal values to the development computer.


Set Up External Mode Communication

For a pseudo-code example that shows how you can provide external mode communication by using the function with related functions, see External Mode Abstraction Layer.

Input Arguments

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Sample time ID of the model, which is 0 for base rate, 1 for first subrate, 2 for second subrate, and so on.

Time when event occurs.

Output Arguments

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Error code, returned as an extmodeErrorCode_T enumeration with one of these values:

  • EXTMODE_SUCCESS (0) –– No error detected.

  • EXTMODE_INV_ARG (-1) –– Arguments invalid.

  • EXTMODE_NOT_INITIALIZED (-9) –– External mode not initialized yet.

  • EXTMODE_NO_MEMORY (-10) –– No memory available on the target hardware.

Version History

Introduced in R2018a