How can I tune S-Function parameters in Simulink Real-Time?

When I enter a literal value in the S-Function parameters dialog, the parameter doesn't show up in the Simulink Real-Time Explorer.

This happens even though I configured the S-Function parameter to be tunable and I set the Default parameter behavior to Tunable.

What is the right way to make an S-Function parameter tunable in Simulink Real-Time?

Answer 1

[MathWorks Support Team]

First confirm that the parameter is configured to be tunable. You can use the sfun_runtime1.c demo from the S-Function Examples as a starting point. 

Then you have 2 options to make the parameter tunable in SLRT

1) Use a variable for the parameter, and pass the variable to the S-Function

2) Create a mask on top of the S-Function, and create a mask parameter to pass down to the S-Function. This is a good option if you want to use a literal expression instead of creating a variable.