MATLAB: Do I get an identifier “RTWSfcnInfo” is undefined error when building a model that contains S-functions for a custom target in Real-Time Worshop 6.3 (R14SP3)

grtrtwrtwsfcninfos-functionsfcnsfunctionsimulink coder

When I build my model that contains S-functions using a custom target based off of GRT, I get the following errors:

 "model.c", line 565: error: identifier "RTWSfcnInfo" is undefined
 "model.c", line 565: error: identifier "sfcnInfo" is undefined

My model builds fine when I remove the S-Functions, or build with GRT.

Best Answer

The RTWSfcnInfo struct is defined in sfcn_bridge.h, which needs to be included when the model is built, by the target template makefile (TMF). The TMF has to define USE_RTMODEL. Our GRT target does it with the following lines of its TMF:

 #------------------------ rtModel ----------------------------------------------
 RTM_CC_OPTS = -DUSE_RTMODEL

This definition starts a whole cascade of dependencies that allows you to use non-inlined S-functions. The RTM_CC_OPTS token is then inserted under the "C Flags" section.

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MATLAB: How to install select callback function in STF

The code:

slConfigUISetVal(hDlg, hSrc, 'ModelReferenceCompliant', 'on');
slConfigUISetEnabled(hDlg, hSrc, 'ModelReferenceCompliant', false);
slConfigUISetVal(hDlg, hSrc, 'ParMdlRefBuildCompliant', 'on');
slConfigUISetEnabled(hDlg, hSrc, 'ParMdlRefBuildCompliant', false);

Should be defined in a separate MATLAB file named custom_select_callback_handler.m that should be present on the MATLAB path:

function custom_select_callback_handler(hDlg, hSrc)
slConfigUISetVal(hDlg, hSrc, 'ModelReferenceCompliant', 'on');
slConfigUISetEnabled(hDlg, hSrc, 'ModelReferenceCompliant', false);
slConfigUISetVal(hDlg, hSrc, 'ParMdlRefBuildCompliant', 'on');
slConfigUISetEnabled(hDlg, hSrc, 'ParMdlRefBuildCompliant', false);

MATLAB: What is the meaning of the ssSetRTWGeneratedSFcn parameter within Real-Time Workshop 6.5 (R2006b)

The expectation is that customers will use the \Subsystem_sfcn_grt_rtw folder in the new location when they want to use the S-function with Real-Time Workshop.

So if the S-function is generated using the S-function Target, this flag is turned on:

 ssSetRTWGeneratedSFcn(S, 1);

in the S-function .mexw32 file. Then, when Real-Time Workshop is used to build the model containing the S-function, it will automatically search for the source files in the Subsystem_sfcn_grt_rtw folder. However, if you want to change the location of the source files, then that flag must be turned off:

 ssSetRTWGeneratedSFcn(S, 0);

Best Answer

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MATLAB: How to install select callback function in STF

MATLAB: What is the meaning of the ssSetRTWGeneratedSFcn parameter within Real-Time Workshop 6.5 (R2006b)

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