Can't determine definition of operator ""srl""

Hallo Tricky

Thanks for the quick reply. Here is my Matlab function for a CIC filter. I get the error on the line where i cast the x. I am not sure if the next parts of the code will also produce some error.

function y = CIC4FPGA( x )

% 4th order CIC filter with 2 times oversampling

%

over = cast(2,'int32');

x = cast(x/8,'int32'); % this line shows the error

persistent comb integrator

if isempty( comb )

comb = cast(zeros(4,1),'int32');

integrator = cast(zeros(4,1),'int32');

end

xx= cast(zeros(length(x)*over, 1),'int32');

y = cast(zeros(length(x)*over, 1),'int32');

a = cast(0,'int32');

b = cast(0,'int32');

% Calculate Comb stage

for i = 1:length(x)

a = x(i) - comb(1);

comb(1) = x(i);

b = a - comb(2);

comb(2) = a;

a = b - comb(3);

comb(3) = b;

b = a - comb(4);

comb(4) = a;

xx( 2*( i-1) + 1 ) = b; % insert (over - 1) zeros

end;

for i=1:length(xx)

integrator(1) = integrator(1) + xx(i);

integrator(2) = integrator(2) + integrator(1);

integrator(3) = integrator(3) + integrator(2);

integrator(4) = integrator(4) + integrator(3);

y(i) = integrator(4);

end;