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

2023 12 22
2 个回答
更新时间：2024 8 6
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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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回答（2 个）

madhan ravi
madhan ravi 2023-12-22

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madhan ravi
madhan ravi 2023-12-22
According to my understanding from Embedded coder documentation it can be only either 1 or 0 values.
dongshan wang
dongshan wang 2023-12-22
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
madhan ravi 2023-12-22
Could you show what you have tried and the generated code?
dongshan wang
dongshan wang 2023-12-25
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 */

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Brandon Stevens
Brandon Stevens 2024-8-6

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Please see the documentation page below for instructions on how to do this in Embedded Coder under the section titled "Boolean Identifiers"
Specify Boolean and Data Type Limit Identifiers

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