Code generation app fails due to 'Function call failed' caused by toolbox function
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I'm trying to convert the code from the Matlab example 5G New Radio Polar Coding using the Matlab Coder app. To do this I seperated out the loop into its own function. However, I'm running into issues at the 'Check for Run-Time Issues' stage giving me a 'Generation of trial code failed' error. I attached a screenshot of the error report. However, this error is caused in a function that is a part of the 5G toolbox, not the function that I'm trying to turn into C code. Can I fix this error without changing the function from the toolbox, or will I need to make my own seperate version that I edit myself in order to circumvent/fix this 'Non-constant expression or empty matrix.' error? Or is something else going on that I'm not seeing here?
Below the function I'm trying to convert. It's copied from the example and minimally changed.
function [errStats, numferr] = frames(K, poly, E, nMax, iIL, crcLen, iBIL, noiseVar, numFrames, L) %#codegen
% Channel
chan = comm.AWGNChannel('NoiseMethod','Variance','Variance',noiseVar);
% Error meter
ber = comm.ErrorRate;
numferr = 0;
for i = 1:numFrames
% Generate a random message
msg = randi([0 1],K,1);
% Attach CRC
msgcrc = nrCRCEncode(msg,poly);
% Polar encode
encOut = nrPolarEncode(msgcrc,E,nMax,iIL);
N = length(encOut);
% Rate match
modIn = nrRateMatchPolar(encOut,K+crcLen,E,iBIL);
% Modulate
modOut = nrSymbolModulate(modIn,'QPSK');
% Add White Gaussian noise
rSig = chan(modOut);
% Soft demodulate
rxLLR = nrSymbolDemodulate(rSig,'QPSK',noiseVar);
% Rate recover
decIn = nrRateRecoverPolar(rxLLR,K+crcLen,N,iBIL);
% Polar decode
decBits = nrPolarDecode(decIn,K+crcLen,E,L,nMax,iIL,crcLen);
% Compare msg and decoded bits
errStats = ber(double(decBits(1:K)), msg);
numferr = numferr + any(decBits(1:K)~=msg);
end
end
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Answers (1)
Oguz Kaan Hancioglu
on 6 Apr 2023
You didn't mention the size of the pArrayPtrLLR. I couldn't figure out what is the corresponding variable in your m file. The dynamic size is not supported. Before using them, you need to define the size of the pArrayPtrLLR like zeros(100,100).
3 Comments
Oguz Kaan Hancioglu
on 7 Apr 2023
I understand more clearly. Have you ever tried to disable dynamic memory allocation? Maybe Matlab determines the size of the pArrayPtrLLR.
cfg.EnableDynamicMemoryAllocation = false;
Matlab suggests the define all variables should be specific class, size, and complexity to generate fixed-size vectors. You can find the detailed information in
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