WriteRTW in a M Level2 S-Function

Hi.

I like to write a TLC to inline a Matlab level2 S-Function. Making the S-Function ready for code-generation.

To access the parameter in the RT-Code, I have to write a "WriteRTW" Function. For Arrays it is not a problem, but I don't know how to handle with strings.

M-File:

...
function WriteRTW(block)  
  b =char([block.DialogPrm(1).Data 0]);  
  block.WriteRTWParam('matrix', 'Params', cast(b,'uint8'));    
%end Terminate
...

TLC-File:

        ...
        char ip[13]; 
        ip[0] = (char)(uint8_T)%<ParamSettings.Params[0][0]>;    
        ip[1] = (char)(uint8_T)%<ParamSettings.Params[0][1]>;     
        ip[2] = (char)(uint8_T)%<ParamSettings.Params[0][2]>;    
        ip[3] = (char)(uint8_T)%<ParamSettings.Params[0][3]>;     
        ip[4] = (char)(uint8_T)%<ParamSettings.Params[0][4]>;    
        ip[5] = (char)(uint8_T)%<ParamSettings.Params[0][5]>;     
        ip[6] = (char)(uint8_T)%<ParamSettings.Params[0][6]>;     
        ip[7] = (char)(uint8_T)%<ParamSettings.Params[0][7]>;    
        ip[8] = (char)(uint8_T)%<ParamSettings.Params[0][8]>;     
        ip[9] = (char)(uint8_T)%<ParamSettings.Params[0][9]>;     
        ip[10] = (char)(uint8_T)%<ParamSettings.Params[0][10]>;     
        ip[11] = (char)(uint8_T)%<ParamSettings.Params[0][11]>;    
        ip[12] = (char)(uint8_T)%<ParamSettings.Params[0][12]>;  
        ...

I like to use it in this way:

block.WriteRTWParam('string', 'Params', block.DialogPrm(1).Data);

Can someone help me?

Answer 1

[Kaustubha Govind]

I experimented a little with the demo file sldemo_msfcn_frame and the contained S-function (run edit msfcn_frame_filt to see the source code), it seems that you should be able towrite:

M-File:

...
function WriteRTW(block)  
  block.WriteRTWParam('string', 'MyStringParam', block.DialogPrm(1).Data);    
...

TLC-File:

%assign myParam = ParamSettings.MyStringParam
const char ip[] = "%<myParam>";

Does this work?

[Thomas]

No, unfortunately not.

I get following error:

### Starting build procedure for model: test_MS
### Generating code into build folder: C:\Users\...\UserProgramm_Simulink\test_MS_ert_rtw
### Invoking Target Language Compiler on test_MS.rtw
### Using System Target File: C:\Program Files (x86)\MATLAB\R2012a\rtw\c\ert\ert.tlc
Error: File: C:\...\UserProgramm_Simulink\test_MS_ert_rtw\test_MS.rtw Line: 2235 Column: 24
syntax error
### Build procedure for model: 'test_MS' aborted due to an error.

test_MS.rtw:

        ...
        ParamSettings {
    MFile      mlpiConnectionBlock
    runAccelOnTLC    no
    isSimViewDevice    no
    Start      Start
    Outputs      Outputs
    MyStringParam    192.168.1.13
          ...

Also, I try it like this. Without success:

block.WriteRTWParam('string', 'MyStringParam', char(block.DialogPrm(1).Data));

If I enter a text(TestString) in the parameter dialog, it works. But when I write the IP-Address (192.168.1.13), it faults with the same error. And when I write it in this way('192.168.1.13'), it will generate code. But the result is false. const char ip[] = "'192.168.1.13'";

Can you help me?

[Thomas]

This is not working:

 block.WriteRTWParam('string', 'MyStringParam', '192.168.1.13');

But this is Ok:

 block.WriteRTWParam('string', 'MyStringParam', ' 192.168.1.13');

That is crazy.

[Kaustubha Govind]

What is the generated code when you simply enter 192.168.1.13?

[Thomas]

It do not generate code, it aborted with error during build rtw.

[Kaustubha Govind]

Thomas: Could you paste the error message please?

[Thomas]

Matlab Level-2 S-function of myUserBlock:

     ...
    function WriteRTW(block)  
      block.WriteRTWParam('string', 'MyStringParam', '192.168.1.13'); 
    %end Terminate
     ...

Error:

### Starting build procedure for model: Model
### Generating code into build folder: C:\...
### Invoking Target Language Compiler on Model.rtw
### Using System Target File: C:\...\ert.tlc
Error: File: C:\...\Model_ert_rtw\Model.rtw Line: 2466 Column: 24
syntax error
### Build procedure for model: 'Model' aborted due to an error.

Model.rtw:

        ...
        MFile      MyUserBlock
      runAccelOnTLC    no
      isSimViewDevice    no
      Start      Start
      Outputs      Outputs
      MyStringParam    192.168.1.13
        ...