How do I implement typedefs of unions + structure variables in Simulink?

How can I implement a union + structure variable in Simulink so that when I generate code I will get a variable structure with shared access?

I want to duplicate the behaviour of the C-code below so I can use typedef struct in several similar data sets.

%Code using C
typedef struct st_module_data{
    struct st_FaultInfo{
	    union{
		    uint8		AllFaults;
		    struct		{
			    uint8	OVP :1;
			    uint8	OVW :1;
			    uint8	UVP :1;
			    uint8	UVW :1;
			    uint8	OCP :1;
			    uint8	OCW :1;
			    uint8	OTP :1;
			    uint8	OTW :1;
		     }
	     }
    }Fault;
    
    struct st_MeasuredData{
        uint8   voltage = 0;
        uint8   current = 0;
        uint8   temperature = 0;
    }Measured;
};
st_module_data s_module_01;

s_module_01.Fault.AllFaults = 0;                            % Clears all flags
s_module_01.Fault.OVP = 1;                                  % Sets only the OVP flag
s_module_01.Measured.voltage = ui8_ADC_5V;                  % Sets the measured voltage to 5V

I was able to recreate the structure and "typedef"-ish callbacks in matlab by using bus editor:

But I am unable to get the union thing working and can only access the lowest heirarchy of the structure - e.g.:

s_module_01.Fault.AllFaults = 0;                            % How do I implement this?
s_module_01.Fault = 0;                                      % Does not work...
s_module_01.Fault.OVP = 1;                                  % OK - works in Matlab Functions, Simulink and Stateflow
s_module_01.Measured.voltage = ui8_ADC_5V;                  % OK - works in Matlab Functions, Simulink and Stateflow

Answer 1

[Prateekshya]

Hi Paul,

As per my understanding you want to implement "union" data structure in Simulink. Simulink does not support direct use of such a data structure. However, there is some workaround available for the same. You can follow this link for more information: https://in.mathworks.com/matlabcentral/fileexchange/116520-use-union-datatype-in-simulink

I hope this helps!

[Meghna]

Could an example for the headerfile linked in this example be provided?