This example shows how to simulate Variant Source and Variant Sink blocks in accelerator and rapid accelerator mode with
startup variant activation time.
Both modes enable faster simulation without changing the model itself. The accelerator and rapid accelerator modes replace the normal interpreted code with compiled target code. Using compiled code speeds up simulation of many models, especially those where runtime is long compared to the time associated with compilation and checking to see if the target is up to date. For more information on accelerator modes, see How Acceleration Modes Work.
Combined with the
startup variant activation time, simulating in accelerator or rapid accelerator mode retains all variant choices. Thus incremental simulation does not regenerate code when there are no structural changes in the model and you only change the variant control value.
Open the model
Variant Source1 has conditions
X==2 for its input ports. The block named
Variant Source1 has an
update diagram activation time.
X is a variant control variable and is defined in the
PostLoadFcn of File -> Model Properties -> Callbacks. The
Sine3 block is active when
X==1 is true, and the
Sine4 block is active when
X==2 is true.
In the block named
Variant Source2 block, the first input port is active when
V==1 is true.The second input port is active when
V==2 is true. The
Variant Source2 has a
startup activation time.
The block named
Variant Sink has the conditions
W==2 on its output ports. These conditions are propagated to the connected blocks. The
Gain5 block is assigned the condition
W==1.The second output port of the
Variant Sink block has the condition
W==2. This condition is propagated to the
Variant Source2 and
Variant Sink blocks have a
startup activation time, all the choices are available. You can toggle the active or inactive branch just before simulation.
Before you run the simulation, set the mode to be either Accelerator or Rapid Accelerator.
You can generate code by clicking on Build ERT or Build GRT. The generated code from Embedded Coder (ERT) or Simulink Coder (GRT) will have regular
if conditions. For more information on generating code with
startup activation time, see Generate Code from Variant Blocks with Startup Activation Time.