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How can I tell EmbeddedCo​der/Simuli​nkCoder to not evaluate expressions containing Matlab tunable parameters when generating C-code from Simulink?

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Matphree
Matphree on 9 Jun 2017
Answered: Ben Rancici on 30 Sep 2019
Hi, I have a saturation block in Simulink where I set upper and lower limits based on a tunable parameter and have the output port generated as global variable:
In the generated C-code the lower limit expression is evaluated to:
srt_gyroXsaturated = rtU.gyro_X >= srt_gyroLimitX ? srt_gyroLimitX :
rtU.gyro_X <= -0.349040151F ? -0.349040151F : rtU.gyro_X;
What I want is that '-srt_gyroLimitX' is not evaluated to '-0.349....' but left "as is" in the generated code. How can I achive that?

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Answers (2)

Saurabh Gupta
Saurabh Gupta on 2 Aug 2017
For tunability in code generation, the parameter needs to be a variable. Parameters specified as expressions are evaluated and inlined. You could specify the limits as 2 separate variables to ensure that code generation preserves the tunability.

Ben Rancici
Ben Rancici on 30 Sep 2019
Same question as Matphree: how to prevent block parameter evaluation in the generated code?
I don't understad Saurabh Gupta's solution.

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