Generating VHDL

Hi! When I try to generate a VHDL from a Simulink model I get this error *Found an unsupported unbounded loop structure. This loop may be user written or automatically generated due to the use of specific vector expressions or functions. For more information on unsupported loop structures, please refer to the documentation* which says it`s reported by Stateflow. It appears when I try to use the Fixed-Point 'min(array)' function into a Matlab Function Block to get the index of an array. 'array'type is fixed point, but the index returned by the function is 'double'. Since the VHDL generation doesn't support double data types, I think it could be the problem. But I can't fix it. Could anyone please tell me what I'm doing wrong? THANKS

Answer 1

[Carlos]

This is the code belonging to the Matlab Function Block:

function k = pure_p_I(u)

persistent K_ANT;

if isempty(K_ANT)
  % zero the counter on first call only
  K_ANT = uint16(1);
  k = uint16(0);
end
long = uint16(1551);        % +1 en long para garantizar el 2º for
x_camino = u(1:long);
y_camino = u(long+1:2*long);
x_vehiculo = u(2*long+1);
y_vehiculo = u(2*long+2);
L = u(2*long+3);
dist=sqrt( (x_camino-x_vehiculo).^2+(y_camino-y_vehiculo).^2 );
dif = abs(dist-L);
dif_delante = dif;
k = K_ANT;
for i = k:long-1
   dif_delante(i-k+1)=dif(i);
end
for i = 1:k
    dif_delante(long-i+1) = 700;
end
                                  How to fix this?? 
[valor,indice] = min(dif_delante);  %indice returned as 'double'

k = indice + k -1;

K_ANT = k;

end

[Kiran Kintali]

Hi Carlos,

If you can send me the example input for 'u', I can see what is going on with the compilation issue.

Also please check out the new MATLAB to HDL workflow in HDL Coder.

http://www.mathworks.com/products/hdl-coder/?s_cid=HP_FP_SL_simhdl

Thank you.

-Kiran

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