Error in function with circular buffer for simulink.

Hello.

I have created a simulink function which takes two inputs and put them in separate circular bufffers circBuff_In_1 and circBuff_In_2. This function calls another function 'Linearizer.m' which is adding the first elements of cicular buffers. But there is an error stating 'An error occured while running the simulation and simulation was terminated caused by : circBuff_In_1 ' Kindly help me rectifying this error. Model and function code attached herewith.

Thanks

Answer 1

[Vinay]

Hi @Manmohan Butola,

The MATLAB function in the simulink model creates two circular buffers named as 'circBuff_In' and 'circBuff_PA' to store the input signal.But the linearizeer function is using different variable names which is causing the issue.

The MATLAB function code can be updated to use the correct variable names as given below

function Output = lin_Fun(In_1,In_2)

coder.extrinsic('Linearizer');
Output= 0;

persistent  circBuff_In;
persistent  circBuff_PA;

if isempty(circBuff_In)
   circBuff_In = zeros(1,10);
end
if isempty(circBuff_PA)
   circBuff_PA = zeros(1,10);
end 

global N; 
global n;

Output = circBuff_In(1)+circBuff_PA(1);

circBuff_In = [In_1 circBuff_In(1:end-1)];
circBuff_PA = [In_2  circBuff_PA(1:end-1)]; 

end

The figure below shows the result of the spectrum analyzer

Hope this would resolve the issue!