How to import C #defines into MATLAB/ Simulink

Question

Christopher Hack 2015-6-8

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https://ww2.mathworks.cn/matlabcentral/answers/223011-how-to-import-c-defines-into-matlab-simulink

回答： Jianning Dong 2018-9-24

Hi,

I am trying to use Simulink and MATLAB coder to generate C code that I will use as MCU firmware on a product. I'm running into a couple of issues doing this, however. For the actual hardware interaction, I'm using some hand-written C functions, which I'm calling by using Simulink generated S-functions (I used the S-Function builder to create them). Some of these functions were written by the MCU manufacturer and they rely on things like #defines which occur in specific header files in order to work. Those defines are used in the function calls.

What I would like to be able to do is import the #defines into MATLAB so that when the code is generated it uses them appropriately. For instance, if I want to call the function

InitTimerFor1mSTimer(HFRCO_SpeedHz, Timer[0]);

and I want the MATLAB variable Timer[0] to contain TIMER0, TIMER1, etc.

I have defined the constants in a type def, however I get errors at compile time complaining that TIMER0 is undefined. Here is the typedef I'm referring to:

classdef TimerTypeDefs
  properties(Constant)
      Timer0 = TIMER0;
      Timer1 = TIMER1;
      Timer2 = TIMER2;
      Timer3 = TIMER3;
  end
end

Any ideas how to achieve this? Thanks in advance for your help.

-Chris Hack

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Answer 1

Drew Davis 2015-6-9

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https://ww2.mathworks.cn/matlabcentral/answers/223011-how-to-import-c-defines-into-matlab-simulink#answer_182136

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The best way to do this is to use the custom code settings in a Simulink model to add any custom macros you may want to add. For instance if you wanted to add a #define macro to the generated header file, you can add the following line of code to "Model Configuration Parameters -> Code Generation -> Custom Code -> Header file":

#define MY_MACRO

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Christopher Hack 2015-6-9

在 MATLAB Online 中打开

Drew,

Thank you for your reply. Unfortunately, this doesn't solve the problem I'm having of actually including the pre-defined macro in the simulink build. When I include

#define TIMER0

In the location you provided then try to generate the code for the model, I get the error

Invalid setting in 'GenTest/Constant34' for parameter 'Value'.
Error evaluating parameter 'Value' in 'GenTest/Constant34'
Undefined function or variable 'TIMER0'.

This is essentially the same problem that I am trying to rectify, as I want to use the pre-defined macro as one of the inputs in my state charts.

Specifically, I have a function that takes the Timer type as an input to determine which timer we're referring to. I want the generated code to pass that defined constant as a parameter to the custom C function so that it works correctly. Is this something that is possible in the current context?

Christopher Hack 2015-6-9