MATLAB: Potential conflicting usages of identifier error in code generation for a reusable function

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I am attempting to generate code for a library block that is reused in multiple models in a model reference hierarchy. Why am I getting the error 'Potential conflicting usages of identifier'?

Potential conflicting usages of identifier '<identifier_name>': a global identifier from '<model_reference_A>’. and a global identifier from '<model_reference_B>'

This conflict may be resolved by either increasing the maximum identifier length on the Identifiers pane of the Configuration Parameters dialog box or by changing the name of the conflicting identifier.

Best Answer

If you select Reusable function for the Function packaging parameter and there are multiple instances of the reusable subsystem in a model reference hierarchy, in order to generate reusable code for the subsystem, File name options must be set to Auto.

If the library subsystem's "Function name" or "File name" options are set to "user specified" when generating code, both instances of the subsystem in the top-level model will try to have the same function/file names, which creates a conflict that cannot be resolved by changing the name mangling parameter.

Related Solutions

MATLAB: Do I receive an error saying “Multiple conflicting usages of identifier” when I run the model that contains referenced models in Simulink 6.6 (R2007a)

The error is due to a name conflct when generating code for the referenced model. For referenced models, the generated code has a series of constructs in the "modelname.c" file.

For example, for the referenced model "tm.mdl", the "tm.c" file has the following named constructs:

    { "mr_tm_B", MDL_INFO_ID_GLOBAL_RTW_CONSTRUCT, 0, 1, (void *) "tm" },
    { "mr_tm", MDL_INFO_ID_GLOBAL_RTW_CONSTRUCT, 0, 1, (void *) "tm" },

Similarly, for the referenced model "tm_B.mdl", the "tm_B.c" file has the following named constructs:

    { "mr_tm_B_B", MDL_INFO_ID_GLOBAL_RTW_CONSTRUCT, 0, 1, (void *) "tm_B" },
    { "mr_tm_B", MDL_INFO_ID_GLOBAL_RTW_CONSTRUCT, 0, 1, (void *) "tm_B" },

Both models have a construct named "mr_tm_B", which causes confusion while running the model.

As a workaround, if there are multiple referenced models in a Simulink model, the models should have unique names and not have any of the following at the end of the name:

 _NSZC
 _Xdis
 _Xdot
 _X
 _RTM
 _ZCE
 _C
 _P
 _DW
 _B
 _rty_0
 _rtu_0
 _Term
 _initialize
 _Start
 _GlobalTID
 _ConstP

A second workaround is to run a referenced model as an inlined model (Normal mode) instead of generating code for the referenced model (Accelerator mode). You can choose the simulation mode for the model from the "Model Reference Parameters" options (select "Model Reference Parameters" by right-clicking the referenced model.) Note that:

1. If the referenced model is run in "Normal Mode", then you must select the "Inline parameters" check box in the Optimization pane of the Configuration Parameters dialog box.

2. This solution is only valid for Simulink v.6.7 (R2007b) or later versions.

3. This solution is only valid when simulating the model. If you generate code for a target, the name confusion issue persists.

MATLAB: How can the “State name” parameter of discrete blocks be set using a variable

1. Add the following code in the callback function Discrete Block -> Block Properties -> Callbacks tab -> InitFcn

set_param(gcb,'StateName',eval(['myVariable']))

2. Initialize myVariable with char type data in the workspace with the name you wish to have in your generated code. For example:

>> myVariable = 'myStateName';

Best Answer

Related Solutions

MATLAB: Do I receive an error saying “Multiple conflicting usages of identifier” when I run the model that contains referenced models in Simulink 6.6 (R2007a)

MATLAB: How can the “State name” parameter of discrete blocks be set using a variable

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