Support Model Referencing
If you want to use a custom system target file for building a model that has referenced models, you must configure the custom system target file to support model referencing.
Requirements for Model Referencing with a Custom System Target File
To build a model that references other models:
Use a custom system target file that is derived from a GRT or ERT system target file.
The custom system target file must declare model reference compliance –– see Declaring Model Referencing Compliance.
The template makefile must define some entities that support model referencing –– see Providing Model Referencing Support in the TMF.
Declaring Model Referencing Compliance
To declare model reference compliance for your target, you must implement a callback
function that sets the
ModelReferenceCompliant flag, and then install the
callback function in the
SelectCallback field of the
rtwgensettings structure in your system target file. The callback
function is triggered whenever the user selects the target in the System Target File
Browser. For example, the following system target file code installs a
SelectCallback function named
rtwgensettings.SelectCallback = 'custom_select_callback_handler(hDlg,hSrc)';
The arguments to the
hSrc) are handles to private data used by the
callback API functions. These handles are restricted to use in system target file callback
functions. They should be passed in without alteration.
Your callback function should set the
ModelReferenceCompliant flag as
slConfigUISetVal(hDlg,hSrc,'ModelReferenceCompliant','on'); slConfigUISetEnabled(hDlg,hSrc,'ModelReferenceCompliant',false); hSrc.refreshDialog;
If you might use the target to build models containing large model reference hierarchies, consider configuring the target to support parallel builds, as discussed in Reduce Build Time for Referenced Models by Using Parallel Builds.
To configure a target for parallel builds, your callback function must also set the
ParMdlRefBuildCompliant flag as follows:
slConfigUISetVal(hDlg,hSrc,'ParMdlRefBuildCompliant','on'); slConfigUISetEnabled(hDlg,hSrc,'ParMdlRefBuildCompliant',false); hSrc.refreshDialog;
Providing Model Referencing Support in the TMF
To configure the template makefile (TMF) for model referencing:
Add the following make variables and tokens to be expanded when the makefile is generated:
MODELREFS = |>MODELREFS<| MODELLIB = |>MODELLIB<| MODELREF_LINK_LIBS = |>MODELREF_LINK_LIBS<| MODELREF_LINK_RSPFILE = |>MODELREF_LINK_RSPFILE_NAME<| RELATIVE_PATH_TO_ANCHOR = |>RELATIVE_PATH_TO_ANCHOR<| MODELREF_TARGET_TYPE = |>MODELREF_TARGET_TYPE<|
The following code excerpt shows how makefile tokens are expanded for a referenced model.
MODELREFS = MODELLIB = engine3200cc_rtwlib.a MODELREF_LINK_LIBS = MODELREF_LINK_RSPFILE = RELATIVE_PATH_TO_ANCHOR = ../../.. MODELREF_TARGET_TYPE = RTW
The following code excerpt shows how makefile tokens are expanded for the top model that references the referenced model.
MODELREFS = engine3200cc transmission MODELLIB = MODELREF_LINK_LIBS = engine3200cc_rtwlib.a transmission_rtwlib.a MODELREF_LINK_RSPFILE = RELATIVE_PATH_TO_ANCHOR = .. MODELREF_TARGET_TYPE = NONE
Token Expands to
MODELREFSfor the top model
List of referenced model names.
Name of the library generated for the model.
MODELREF_LINK_LIBStoken for the top model
List of referenced model libraries that the top model links against.
MODELREF_LINK_RSPFILEtoken for the top model
Name of a response file that the top model links against. This token is valid only for build environments that support linker response files. For an example of its use, see
Relative path, from the location of the generated makefile, to the MATLAB® working folder.
Signifies the type of target being built. Possible values are
NONE: Standalone model or top model referencing other models
RTW: Model reference target build
SIM: Model reference simulation target build
RELATIVE_PATH_TO_ANCHORinclude path to the overall
INCLUDES = -I. -I$(RELATIVE_PATH_TO_ANCHOR) $(ADD_INCLUDES) \ $(USER_INCLUDES) $(SHARED_INCLUDES)
SRCSvariable in your TMF so that it initially lists only common modules. Additional modules are then appended conditionally, as described in the next step. For example, change
SRCS = $(MODEL).c $(MODULES) ert_main.c $(ADD_SRCS) $(EXT_SRC)
SRCS = $(MODULES)
Create variables to define the final target of the makefile. You can remove variables that may have existed for defining the final target. For example, remove
PROGRAM = ../$(MODEL)
and replace it with
ifeq ($(MODELREF_TARGET_TYPE), NONE) # Top model for RTW PRODUCT = $(RELATIVE_PATH_TO_ANCHOR)/$(MODEL) BIN_SETTING = $(LD) $(LDFLAGS) -o $(PRODUCT) $(SYSLIBS) BUILD_PRODUCT_TYPE = "executable" # ERT based targets SRCS += $(MODEL).c ert_main.c $(EXT_SRC) # GRT based targets # SRCS += $(MODEL).c grt_main.c rt_sim.c $(EXT_SRC) $(SOLVER) else # sub-model for RTW PRODUCT = $(MODELLIB) BUILD_PRODUCT_TYPE = "library" endif
If the template makefile is associated with a toolchain, remove
Create rules for the final target of the makefile (replace existing final target rules). For example:
ifeq ($(MODELREF_TARGET_TYPE),NONE) # Top model for RTW $(PRODUCT) : $(OBJS) $(LIBS) $(MODELREF_LINK_LIBS) $(BIN_SETTING) $(LINK_OBJS) $(MODELREF_LINK_LIBS) $(LIBS) @echo "### Created $(BUILD_PRODUCT_TYPE): $@" else # sub-model for RTW $(PRODUCT) : $(OBJS) $(LIBS) @rm -f $(MODELLIB) $(ar) ruvs $(MODELLIB) $(LINK_OBJS) @echo "### Created $(MODELLIB)" @echo "### Created $(BUILD_PRODUCT_TYPE): $@" endif
Create a rule to allow referenced models to compile files that reside in the MATLAB working folder (
%.o : $(RELATIVE_PATH_TO_ANCHOR)/%.c $(CC) -c $(CFLAGS) $<
If you are using a TMF without the variable
MODELREFS, the file
might have been used with a previous release of Simulink® software. If you want your TMF to support model referencing, add either
MODELREFS to the make file.
Controlling Configuration Option Value Agreement
By default, the value of a configuration option defined in the system target file for a
TLC-based custom target must be the same in a referenced model and its parent model. To
relax this requirement, include the
modelReferenceParameterCheck field in
rtwoptions structure element that defines the configuration option,
and set the value of the field to
'off'. For example:
rtwoptions(2).prompt = 'My Custom Parameter'; rtwoptions(2).type = 'Checkbox'; rtwoptions(2).default = 'on'; rtwoptions(2).modelReferenceParameterCheck = 'on'; rtwoptions(2).tlcvariable = 'mytlcvariable'; ...
The configuration option My Custom Parameter can differ
in a referenced model and its parent model. See Customize System Target Files for information about TLC-based system target
files, and rtwoptions Structure Fields Summary for a list of
Preventing Resource Conflicts (Optional)
Hook files are optional TLC and MATLAB program files that are invoked at well-defined stages of the build process. Hook files let you customize the build process and communicate information between various phases of the process.
If you are adapting your custom target for code generation compatibility with model reference features, consider adding checks to your hook files for handling referenced models differently than top models to prevent resource conflicts.
For example, consider adding the following check to your
% Check if this is a referenced model mdlRefTargetType = get_param(codeGenModelName,`ModelReferenceTargetType'); isNotModelRefTarget = strcmp(mdlRefTargetType, `NONE'); % NONE, SIM, or RTW if isNotModelRefTarget % code that is specific to the top model else % code that is specific to the referenced model end
You may need to do a similar check in your TLC code.
%if !IsModelReferenceTarget() %% code that is specific to the top model %else %% code that is specific to the referenced model %endif