Why do I get the error: "Cannot change parameter while simulation is running" when running my Simulink model in "Monitor and Tune" mode on external hardware?

I cannot change any of my model parameters when I run my Simulink model in External Mode ("Monitor and Tune") with supported hardware, like TI C2000 or STM32 boards. When I try to change a parameter on my Simulink model, I face this error:

"Cannot change parameter 'Constant value: (Value)' of 'ePWM_LED/Constant' while simulation is running".

What can I do to be able to tune parameters without stopping the simulation?

Answer 1

[MathWorks Support Team]

The “Default Parameter Behavior” is currently set to "Inlined" in the model configuration, whereas it needs to be set to “Tunable” to change parameter values during run-time.  You can find this setting by referring to "Configuration Parameters" -> "Code Generation" -> "Optimization" -> "Default parameter behavior". Please see the image below. 

With the setting configured to: 

• “Inlined”: The values cannot be changed during run-time. This setting generates optimized code wherein the values of the corresponding blocks parameters are inlined to reduce RAM usage. 
• “Tunable”: The values can be changed during run-time. This setting generates code with the values of the corresponding block parameters set as tunable fields of a global parameters structure. 

For more info on the setting, please refer to the doc page: 

https://www.mathworks.com/help/rtw/ref/defaultparameterbehavior.html