MATLAB: Using calllib inside MATLAB Function

Question

Hello together,

previously, I included an external C libary via callib. As a result, I can call the external commands from there in usual MATLAB scripts.

Now, I want to call the external commands from the C libaray periodically with every time step of my Simulink model. So I have tried to call these commands within a MATLAB function. Unfortunately, I get the following error message:

Function 'calllib' not supported for code generation. Function 'write2ByteTxRx.m' (#70.1182.1264), line 35, column 1: "calllib(lib_name, 'write2ByteTxRx', port_num, protocol_version, id, address, dat" Launch diagnostic report.

From my perspective, the problem is the usage of calllib inside the external function I want to call from the C library:

function [] = write2ByteTxRx( port_num, protocol_version, id, address, data )
lib_name = '';
if strcmp(computer, 'PCWIN')
  lib_name = 'dxl_x86_c';
elseif strcmp(computer, 'PCWIN64')
  lib_name = 'dxl_x64_c';
elseif strcmp(computer, 'GLNX86')
  lib_name = 'libdxl_x86_c';
elseif strcmp(computer, 'GLNXA64')
  lib_name = 'libdxl_x64_c';
elseif strcmp(computer, 'MACI64')
  lib_name = 'libdxl_mac_c';
end
calllib(lib_name, 'write2ByteTxRx', port_num, protocol_version, id, address, data);
end

Does anyone know how I could avoid this problem? Actually, I don't want to create code. Basically, I would like to use external C functions periodically inside a Simulink model. That's why I have tried to use a MATLAB Function. I already thougth about MATLAB Systems – but they also use functions inside which may cause the same problem I have right now.

Thank you very much in advance!

Answer 1

I solved the problem by using coder.entrinsic. According to my example above, I set:

coder.extrinsic('write2ByteTxRx');

Now, the Simulink model is compling.