Shared nested structure between models in generated code

I have several models from which I generate C code using the Embedded Coder toolbox.

In these models, I would like to use a neseted structure variable to share information.

st1 = struct(...
    'Fault_value',  single(0),...
    'Enable',       boolean(0));

Faults = struct( ...
    'model1', struct(...
        'f1', st1,...
        'f2', st1), ...
    'model2', struct(...
        'f1', st1,...
        'f2', st1));

As this structure is shared across multiple models, the definition should be done in a separete file.

First I create a simulink bus for each strcuture:

Simulink.Bus.createObject(Faults);
faults_t = slBus3;
model1_t = model1;
model2_t = model2;
st1_t = f1;
clear model1 model2 f1 f2 slBus1_f1 slBus2_f2 slBus3

Then I assign the bus type to each element:

faults_t.Elements(1).DataType = 'Bus: model1_t';
faults_t.Elements(2).DataType = 'Bus: model1_t';
model1_t.Elements(1).DataType = 'Bus: st1_t';
faults_t.Elements(2).DataType = 'Bus: st1_t';
faults_t.Elements(1).DataType = 'Bus: st1_t';
model2_t.Elements(2).DataType = 'Bus: st1_t';

In order for the type to be defined outside the models headers I define each bus DataScope as Exported.

faults_t.DataScope = 'Exported';
model1_t.DataScope = 'Exported';
model2_t.DataScope = 'Exported';
st1_t.DataScope = 'Exported';

Finally I create a Simulink.Parameter of Faults and set the DataType to 'faults_t'

Faults = Simulink.Parameter(Faults);
Faults.CoderInfo.StorageClass = 'ImportedExternPointer';
Faults.DataType = 'Bus: faults_t';

One I have done this I set constant blocks inside the models using this names

• Faults.model1.f1
• Faults.model2.f2

The expected output would be:

• The code is generated correctly
• The models use a pointer to Faults variable
• The definition of each structure is generated in a separated file. (test_model.c, test_model.h, faults_t.h, st1_t.h, ...)

Answer 1

[Githin George]

Hi Mikel,

I understand you are trying to create a ‘Simulink Bus Object’ for ‘Faults’ and is facing an error in the model. I am assuming the error is caused due to wrong assignment of ‘DataType’ for the various ‘Bus Elements’. Please recheck code section 3 where the ‘Bus Elements’ are getting assigned. This should resolve the error in the model and allow you to generate code correctly. I hope this helps.