How to generate bool type identifier 'true' and 'false' C code

Question

dongshan wang 2023-12-22

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2063232-how-to-generate-bool-type-identifier-true-and-false-c-code

回答： Brandon Stevens 2024-8-6

I got some Simulink.Parameter with data type boolean in Simulink model, and i m tring to generate C code with Code generater. But everytime i got code such as:

const Boolean_T c_flag = 1;
// or
const Boolean_T c_flag = 0;

however what i want is things like :

const Boolean_T c_flag = true;
// or
const Boolean_T c_flag = false;
// or 
const Boolean_T c_flag = Boolean(1);
// or 
const Boolean_T c_flag = Boolean(0);

i have tried to set the parameter value to '1', 'true', '=true' or even '=boolean(1)',but nothing works.

is that possible in Code Generater/

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Answer 1

madhan ravi 2023-12-22

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https://ww2.mathworks.cn/matlabcentral/answers/2063232-how-to-generate-bool-type-identifier-true-and-false-c-code#answer_1376037

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madhan ravi 2023-12-22

Could you show what you have tried and the generated code?

dongshan wang 2023-12-25

在 MATLAB Online 中打开

For some reasons i cnt not upload figures, anyway i will try to provide a detailed description about what i have tried.

First of all I set a <Simulink.Parameters> which named 'b_Flag', you can get a same variable using commands follow：

b_Flag = Simulink.Parameter;
b_Flag.Value = false;
b_Flag.DataType = 'boolean'
b_Flag.CoderInfo.StorageClass = 'Custom';
b_Flag.CoderInfo.CustomStorageClass = 'Const';
b_Flag.CoderInfo.CustomAttributes.HeaderFile = 'calibration.h';
b_Flag.CoderInfo.CustomAttributes.DefinitionFile = 'calibration.c';

I added that variable to a matlab example model (which you can find here) for a demonstration.

The generated code are as follow, there are two bool type Macros 'true' and 'false' in <rtwtypes.h>.

// File: rtwtypes.h
/*
* File: rtwtypes.h
*
* Code generated for Simulink model 'rtwdemo_roll'.
*
* Model version                  : 1.151
* Simulink Coder version         : 9.1 (R2019a) 23-Nov-2018
* C/C++ source code generated on : Mon Dec 25 10:45:14 2023
*/

#ifndef RTWTYPES_H
#define RTWTYPES_H

/* Logical type definitions */
#if (!defined(__cplusplus))
#  ifndef false
#   define false                       (0U)
#  endif

#  ifndef true
#   define true                        (1U)
#  endif
#endif
...
    
typedef signed char int8_T;
typedef unsigned char uint8_T;
typedef short int16_T;
typedef unsigned short uint16_T;
typedef int int32_T;
typedef unsigned int uint32_T;
typedef long long int64_T;
typedef unsigned long long uint64_T;
typedef float real32_T;
typedef double real64_T;

...

and the declaration in <calibration.h> looks just fine (line 18):

// File: calibration.h
/*
* File: calibration_public.h
*
* Code generated for Simulink model 'rtwdemo_roll'.
*
* Model version                  : 1.151
* Simulink Coder version         : 9.1 (R2019a) 23-Nov-2018
* C/C++ source code generated on : Mon Dec 25 10:45:14 2023
*/

#ifndef RTW_HEADER_calibration_public_h_
#define RTW_HEADER_calibration_public_h_
#include "rtwtypes.h"

/* Const memory section */
/* Exported data declaration */
/* Declaration for custom storage class: Const */
extern const boolean_T b_Flag;

#endif                                 /* RTW_HEADER_calibration_public_h_ */

/*
* File trailer for generated code.
*
* [EOF]
*/


However this variable is defined as '0' but bot 'false' (line 26). That's the problem has been bothering me all along, all i want is a line of code with identifier 'false'.

// File: calibration_public.c
/*
* File: calibration_public.c
*
* Code generated for Simulink model 'rtwdemo_roll'.
*
* Model version                  : 1.151
* Simulink Coder version         : 9.1 (R2019a) 23-Nov-2018
* C/C++ source code generated on : Mon Dec 25 11:10:46 2023
*
* Target selection: ert.tlc
* Embedded hardware selection: Intel->x86-64 (Windows64)
* Code generation objectives:
*    1. Execution efficiency
*    2. Traceability
*    3. Safety precaution
*    4. RAM efficiency
* Validation result: Not run
*/

#include "rtwdemo_roll.h"

/* Exported data definition */

/* Const memory section */
/* Definition for custom storage class: Const */
const boolean_T b_Flag = 1;

/*
* File trailer for generated code.
*
* [EOF]
*/