Multirate Modeling in Multitasking Mode (VxWorks® OS)

This example generates code for a multirate discrete-time model configured for a multitasking operating system target (VxWorks®). The model contains two sample times. Inport block 1 and Inport block 2 specify 1-second and 2-second sample times, respectively, which are enforced by the setting of model configuration parameter Periodic sample time constraint. The solver is set for multitasking operation, which means a Rate Transition block is required to ensure that data integrity is enforced when the 1-second task preempts the 2-second task. Simulink® and the code generator enforce proper rate transitions. This model specifies an explicit Rate Transition block. Alternatively, you can instruct Simulink® to insert this block for you by setting model configuration parameter Automatically handle rate transition for data transfer.

The model is configured to display color-coded sample times with annotations. To see them, after opening the model, update the diagram by pressing Ctrl+D. To display the legend, press Ctrl+J. Red represents the fastest discrete sample time in the model, green represents the second fastest, and yellow represents mixed sample times.

model = 'MultirateMultitaskingOS';
open_system(model);