Found unsupported type in switch expression; switch expression must be of discrete type

Hello,

I use a Matlab Function block as state machine in my Simulink module. Everything works, except the RTL Code generation in the HDL Workflow Advisor. At this point I get the following error:

Found unsupported type in switch expression; switch expression must be of discrete type, Function ‘MNIST_CNN/MAXPOOL_BANK_20/CONTROL/MATLAB Function’ (#1650.355.365), line 13, column 9.

My Matlab Code looks like this:

function [hStart,hEnd,valid,reset,enable] = maxpool_fsm(hStart_in,hEnd_in,valid_in)
%states:
ready = 0;
vector = 1;
matrix = 2;
wait_for_next_line=3;
% using persistent keyword to model state registers in hardware
persistent curr_state;
if isempty(curr_state)
    curr_state = ready;   
end
% switch to new state based on the value state register
switch (curr_state)
    case ready,        
        if (hStart_in==true && valid_in==true)
            curr_state=vector;
            valid=false;
            reset=true;
            enable=true;
            hEnd=false;
            hStart=true;
        else
            curr_state=ready;
            valid=false;
            reset=true;
            enable=true;
            hEnd=false;
            hStart=false;
        end
        
    case vector,        
        if (valid_in == true && hEnd_in==true)
            curr_state=wait_for_next_line;
            valid=true;
            reset=false;
            enable=true;
            hEnd=true;
            hStart=false;
        elseif (valid_in == true)
            curr_state=matrix;
            valid=true;
            reset=false;
            enable=true;
            hEnd=false;
            hStart=false;
        else
            curr_state=vector;
            valid=false;
            reset=true;
            enable=true;
            hEnd=false;
            hStart=false;
        end
        
    case matrix,       
        if (hEnd_in==true)
            curr_state=wait_for_next_line;
            valid = false;
            reset = false;
            enable = false;
            hEnd=true;
            hStart=false;
        elseif (valid_in==true)
            curr_state=vector;
            valid = false;
            reset = true;
            enable = true;
            hEnd=false;
            hStart=false;
        else
            curr_state=matrix;
            valid=false;
            reset=false;
            enable=false;
            hEnd=false;
            hStart=false;
        end
        
   
    case wait_for_next_line,
        if (hEnd_in==true)
            curr_state=ready;
            valid = false;
            reset=false;
            enable = false;
            hEnd=false;
            hStart=false;
        else
            curr_state=wait_for_next_line;
            valid = false;
            reset=false;
            enable = false;
            hEnd=false;
            hStart=false;
        end
    otherwise,
        valid = false;
        reset=false;
        enable = false;
        hEnd=false;
        hStart=false;
        
end

During compilation and simulation everything works. I have no clue, where the error is. In the Model Advisor the following error appeas:

Failed The model contains constructs that are unsupported for HDL code generation.

Error using hdlcoder.pirctx/invokeBackEnd

The model contains constructs that are unsupported for HDL code generation.

Error in slhdlcoder.HDLCoder/makehdl

Error in slhdlcoder.HDLCoder/makehdlturnkey

Error in downstream.DownstreamIntegrationDriver/runIPCoreCodeGen

Error in generateIPCore

Error in Simulink.ModelAdvisor/executeCheckCallbackFct

Error in Simulink.ModelAdvisor/run

Error in Simulink.ModelAdvisor/runCheck

Error in ModelAdvisor.Node/runTaskAdvisor

Error in ModelAdvisor.Node.runtohere>runToBreakpoint

Error in ModelAdvisor.Node.runtohere

ANSWER

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I solved the issue by not declaring the state variable as persistent, but instead using a delay outside the matlab function block:

function [hStart,hEnd,valid,reset,enable,curr_state_out] = maxpool_fsm(curr_state_in,hStart_in,hEnd_in,valid_in)
%states:
ready = uint8(0);
vctr = uint8(1);
mtrx = uint8(2);
wait_for_next_line=uint8(3);
% using persistent keyword to model state registers in hardware
%persistent curr_state;
curr_state_out=uint8(0);
if isempty(curr_state_out)
    curr_state_out = ready;   
end
% switch to new state based on the value state register
switch(curr_state_in)
    case ready,        
        if (hStart_in==true && valid_in==true)
            curr_state_out=vctr;
            valid=false;
            reset=true;
            enable=true;
            hEnd=false;
            hStart=true;
        else
            curr_state_out=ready;
            valid=false;
            reset=true;
            enable=true;
            hEnd=false;
            hStart=false;
        end

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Found unsupported type in switch expression; switch expression must be of discrete type

Found unsupported type in switch expression; switch expression must be of discrete type