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

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/

Answer 1

[madhan ravi]

[madhan ravi]

According to my understanding from Embedded coder documentation it can be only either 1 or 0 values.

[dongshan wang]

Thanks for your anwser. It no doubt that a boolean type should be 0 or 1 values,but what i want is a string 'bTrue' but not a numeric value '1' in my code.

I have tried waht it said in your figure, which i difiened custom boolean identifiers bFalse and bTrue, but unfortunately this two identifiers have never appeared in the generated code. They have been replaced with integer number 0 and 1.

[madhan ravi]

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

[dongshan wang]

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

1	/*
2	 * File: rtwtypes.h
3	 *
4	 * Code generated for Simulink model 'rtwdemo_roll'.
5	 *
6	 * Model version                  : 1.151
7	 * Simulink Coder version         : 9.1 (R2019a) 23-Nov-2018
8	 * C/C++ source code generated on : Mon Dec 25 10:45:14 2023
9	 */
10	
11	#ifndef RTWTYPES_H
12	#define RTWTYPES_H
13	
14	/* Logical type definitions */
15	#if (!defined(__cplusplus))
16	#  ifndef false
17	#   define false                       (0U)
18	#  endif
19	
20	#  ifndef true
21	#   define true                        (1U)
22	#  endif
23	#endif

...
    
42	typedef signed char int8_T;
43	typedef unsigned char uint8_T;
44	typedef short int16_T;
45	typedef unsigned short uint16_T;
46	typedef int int32_T;
47	typedef unsigned int uint32_T;
48	typedef long long int64_T;
49	typedef unsigned long long uint64_T;
50	typedef float real32_T;
51	typedef double real64_T;
52	
...

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

// File: calibration.h

1	/*
2	 * File: calibration_public.h
3	 *
4	 * Code generated for Simulink model 'rtwdemo_roll'.
5	 *
6	 * Model version                  : 1.151
7	 * Simulink Coder version         : 9.1 (R2019a) 23-Nov-2018
8	 * C/C++ source code generated on : Mon Dec 25 10:45:14 2023
9	 */
10	
11	#ifndef RTW_HEADER_calibration_public_h_
12	#define RTW_HEADER_calibration_public_h_
13	#include "rtwtypes.h"
14	
15	/* Const memory section */
16	/* Exported data declaration */
17	/* Declaration for custom storage class: Const */
18	extern const boolean_T b_Flag;
19	
20	#endif                                 /* RTW_HEADER_calibration_public_h_ */
21	
22	/*
23	 * File trailer for generated code.
24	 *
25	 * [EOF]
26	 */
27	

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

1	/*
2	 * File: calibration_public.c
3	 *
4	 * Code generated for Simulink model 'rtwdemo_roll'.
5	 *
6	 * Model version                  : 1.151
7	 * Simulink Coder version         : 9.1 (R2019a) 23-Nov-2018
8	 * C/C++ source code generated on : Mon Dec 25 11:10:46 2023
9	 *
10	 * Target selection: ert.tlc
11	 * Embedded hardware selection: Intel->x86-64 (Windows64)
12	 * Code generation objectives:
13	 *    1. Execution efficiency
14	 *    2. Traceability
15	 *    3. Safety precaution
16	 *    4. RAM efficiency
17	 * Validation result: Not run
18	 */
19	
20	#include "rtwdemo_roll.h"
21	
22	/* Exported data definition */
23	
24	/* Const memory section */
25	/* Definition for custom storage class: Const */
26	const boolean_T b_Flag = 1;
27	
28	/*
29	 * File trailer for generated code.
30	 *
31	 * [EOF]
32	 */