How to Create Custom Get Set Functions in Embedded Coder ?

Question

AbhimanyuSingh 2023-7-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1996748-how-to-create-custom-get-set-functions-in-embedded-coder

编辑： MaVo 2024-6-28

Want to generate a customized Get Set Function for the below mentioned example:

//Example: Application.c

void appFunc()

{

uint8_T tempData;

Get_TempData_Sts( &var );

tempData=var*2;

Set_TempData( tempData);

}

//////////////////////////// External C- Code ////////////////////

static uint8_T sendData;

sendData =3;

static uint8_T recieveData;

void Get_TempData_Sts( uint8_T * Value )

{

*Value = sendData;

}

void Set_TempData( uint8_T Value_t )

{

recieveData = Value_t;

}

Currently Get Set Function which i found with Embedded COder Help page is without argument as mentione below:

Get_TempData_Sts();

or *Get_TempData();

I Want Get Set function to be Generated via Embedded Coder as mentioned below :

Get_TempData_Sts( &var ); // Get Function

Set_TempData( tempData); // Set Function

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Answer 1

Anavi Somani 2023-7-17

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1996748-how-to-create-custom-get-set-functions-in-embedded-coder#answer_1274053

在 MATLAB Online 中打开

Hi Abhimanyu, yo can check this modiefied code once.

void appFunc()
{
	uint8_T tempData;
	Get_TempData_Sts(&var);	
	tempData = var * 2;	
	Set_TempData(tempData);		
}
//////////////////////////// External C- Code ////////////////////
static uint8_T sendData;
static uint8_T recieveData;
void Get_TempData_Sts(uint8_T* Value)
{
	*Value = sendData;
}
void Set_TempData(uint8_T Value_t)
{
	recieveData = Value_t;
}

In this modified code, the Get_TempData_Sts function now accepts a pointer to a uint8_T variable as an argument. This allows the function to store the value of sendData in the variable passed as an argument.

Similarly, the Set_TempData function now takes a uint8_T value as an argument. This allows the function to set the value of recieveData to the provided argument.

With these modifications, you can call the functions as Get_TempData_Sts(&var) to get the value of sendData and Set_TempData(tempData) to set the value of recieveData.

Let me know if this helps.

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Anavi Somani 2023-7-18

在 MATLAB Online 中打开

Did you tried doing it this way, if not then follow these steps once?

To generate the desired Get and Set functions in the generated code using Embedded Coder, you can follow these steps:

1. Open your Simulink model in MATLAB.

2. Select the Simulink.Signal object that corresponds to the signal you want to generate the Get and Set functions for.

3. Open the Signal Properties dialog for the selected signal. You can do this by right-clicking on the signal and selecting "Properties" or by double-clicking on the signal.

4. In the Signal Properties dialog, go to the "Storage Class" tab.

5. Set the Storage Class for the signal to "GetSet". This informs Embedded Coder that you want to generate Get and Set functions for this signal.

6. Optionally, you can also set the "Access" mode to "Pointer" in the Embedded Coder Dictionary for the signal. This will generate the Get function with a pointer argument, as mentioned in your example.

7. Save the changes to the model.

8. Generate the code using Embedded Coder. This can be done by clicking on the "Generate Code" button or by using the "codegen" command in MATLAB.

After generating the code, you should see the Get and Set functions in the generated code with the desired names and arguments, as specified by the Storage Class and Access mode settings.

For example, if you have a signal named "TempData" with Storage Class set to "GetSet" and Access mode set to "Pointer", the generated code would include the following functions:

void Get_TempData_Sts(double *var) {
}
void Set_TempData(double tempData) {
}

AbhimanyuSingh 2023-7-18

Thanks Anavi for the Steps,

I followed the same steps earlier and again as per your suggestion, but I am not getting expected out come :

This is what I am getting

# *Get_TempData() = 2.0 * *Get_TempData_Sts(); % While Selecting Access Mode as Pointer

Whereas I am expecting like this :

Get_TempData_Sts(&var);

Set_TempData(2.0 * var );

Can You please elaborate how you were able to generate function call in application function, And also how you generated these functions ?

void Get_TempData_Sts(double *var) {

}

void Set_TempData(double tempData) {

}

This is my implementation:

MaVo 2024-6-7

编辑：MaVo 2024-6-28

在 MATLAB Online 中打开

Hello,

I did encounter the same issue. I also wanted to access the pointer arguement within a function as the signal to acces via an inport block. The currently implemented options within embedded coder do not allow this.

The Embbed Coder can only evaluate the return value of a function. The return type can be accessed directly or via pointer and that's about it. You can select this in within the Embedded Coder Dictionary for a Custom Storage Class

The function prototype which appears later in the generated C-Code looks like this.

In the Pseudecode Get Function you can see, that only the return value is assigned as a pointer, not the arguement, which remains empty.

If you want to access the pointer function arguement of a C-function currently the only choice is to parse the C-function that is referenced in your model Config under Configuration -> Code Generation -> Custom Code within the "Include headers" and "Source files" tabs and then use the C-Caller Block within Simulink.

If the source and header files have been parsed successfully (check MATLAB console output after applying the Config), you can access your C-function within a drop down menu in the block properties.

for a C-function of the following type, the C-Caller changes it's interface.

% argument: value - pointer of type float32
% return  : out - uint8
% C-Code function prototype
uint8 myfun(float32 *value)

C Caller standard Interface:

C Caller with pointer arguement in function and return value:

As you can see the value represented by a pointer has a bidirectional access. You can read and write to it at the same time. Whereas the return arguement only appears as an outport.

If I had a wish towards a future improvement of the embedded coder, then it would the possibility to access pointer function arguements with several options how to embedded these signal(s) within the Simulink signal propagation. For the example above, it would be suitable to access both output signals via an Bus Object with elements "value" and "out", which would also automatically set the Data Type of the Inport to the matching Bus Object. Within the C-Code there could be a wrapper function (funout2struct) that does the signal handling and provides the signals as a struct to the "step_function()".

typedef struct BusObject
{
float32 value;
uint8 out;
};
BusObject funout2struct()
{
BusObject tmp;
tmp.out = myfun(&tmp.value);
return tmp
}

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How to Create Custom Get Set Functions in Embedded Coder ?

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