S-Function Logical Modelisation

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Hello Every Body,

I'm starting to develop in Matlab Language to translating some Simulink code into S-Function. My first library is to check the varaition of my input signal. In the picture, I check if the old value of the input is for exemple False, and the new alue of the input is True, then the output is true. If the old input is an other value, and the new input is True then the output is false because I just Check if the Input change False to True.

The picture in my post is my simulink model. Here is the Simulink S-Function

function [output, oldInput_Out, change, FlagDetectChange_Out]= fcn(Init,input,oldInput_In, FlagDetectChange_In)
      INITIAL_VALUE = 0;
      FINAL_VALUE   = 1;
      OTHERS_VALUE  = 2;
      Changed   = 1;
      NoChanged = 0;
      False = 0;
      True = 1;
        if (Init)
            output = 0;
            oldInput_Out = 0;
            change = uint8(NoChanged);
            FlagDetectChange_Out = False;
        else        
            if (((oldInput_In==INITIAL_VALUE) || (oldInput_In==FINAL_VALUE))&&((input==INITIAL_VALUE)||(input==FINAL_VALUE))) 
                change = uint8(xor(input, oldInput_In)); 
            else 
                change = uint8(OTHERS_VALUE);
            end
            if (FlagDetectChange_In== False && change==NoChanged && oldInput_In==INITIAL_VALUE && input==INITIAL_VALUE)
                output = 0;
                FlagDetectChange_Out = False;
            elseif (FlagDetectChange_In== False && change==Changed && oldInput_In==INITIAL_VALUE && input==FINAL_VALUE)
                output = 1;
                FlagDetectChange_Out = True;
            elseif (FlagDetectChange_In== True && change==Changed && oldInput_In==INITIAL_VALUE && input==FINAL_VALUE)
                output = 1; 
                FlagDetectChange_Out = True;
            elseif (FlagDetectChange_In== True && change==NoChanged && oldInput_In==FINAL_VALUE && input==FINAL_VALUE)
                output = 1; 
                FlagDetectChange_Out = False;
            elseif (FlagDetectChange_In== False && change==NoChanged && oldInput_In==FINAL_VALUE && input==FINAL_VALUE)
                output = 1; 
                FlagDetectChange_Out = False;
            elseif (change==OTHERS_VALUE)
                output = 5; 
                FlagDetectChange_Out = False;
            else
                output = 5;
                FlagDetectChange_Out = False;
            end
            oldInput_Out = input;
            %FlagDetectChange_Out = double(change);
        end
    end