How can I tell EmbeddedCoder/SimulinkCoder to not evaluate expressions containing Matlab tunable parameters when generating C-code from Simulink?

Question

Matphree 2017-6-9

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/344043-how-can-i-tell-embeddedcoder-simulinkcoder-to-not-evaluate-expressions-containing-matlab-tunable-par

回答： Ben Rancici 2019-9-30

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?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Saurabh Gupta 2017-8-2

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/344043-how-can-i-tell-embeddedcoder-simulinkcoder-to-not-evaluate-expressions-containing-matlab-tunable-par#answer_276538

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.