Code generation of an S-function with multiple inputs and outputs

Question

Vighnesh 2022-10-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1816470-code-generation-of-an-s-function-with-multiple-inputs-and-outputs

Hi. As a follow up to my previous query, I'm now trying to generate a dll from an S-function that takes in three inputs and returns 3 outputs. This is based on the following equations :

Where V, alpha and beta are the inputs into the S-function block and u,v and w are the outputs respectively. I'm getting the right results whenever I run the simulation but upon code generation, I'm getting the following error messages:

warning C4013: 'cos' undefined; assuming extern returning int

error C2143: syntax error: missing ')' before ';'

I have attached relevant snippets of the S-function code as well as the generated C code respectively below:

M file:

V = block.InputPort(1).Data;

alpha = block.InputPort(2).Data;

beta = block.InputPort(3).Data;

u = block.OutputPort(1).Data;

v = block.OutputPort(2).Data;

w = block.OutputPort(3).Data;

u = V * cos(alpha) * cos(beta);

v = V * sin(beta);

w = V * sin(alpha) * cos(beta);

C :

rtb_Level2MATLABSFunction_o1 = simpleflight_U.V * (cos(simpleflight_U.V) *

(cos(simpleflight_U.V));

rtb_Level2MATLABSFunction_o2 = simpleflight_U.V * (sin(simpleflight_U.V));

rtb_Level2MATLABSFunction_o3 = simpleflight_U.V * (sin(simpleflight_U.V)) *

(cos(simpleflight_U.V));

As you can see, in addition to the error messages, only one of the three inputs is being used in the generated c code.

I have also attached the tlc file below for further reference:

%implements "vab_to_uvw1" "C"

%% Function: Outputs ===========================================================

%%

%function Outputs(block, system) Output

/* %<Type> block: %<Name> */

%assign rollVars = ["U", "Y"]

%roll idx = RollRegions, lcv = RollThreshold, block, "Roller", rollVars

%assign V = LibBlockInputSignal(0, "", "", 0)

%assign alpha = LibBlockInputSignal(0, "", "", 1)

%assign beta = LibBlockInputSignal(0, "", "", 2)

%assign u = LibBlockOutputSignal(0, "", lcv, idx)

%assign v = LibBlockOutputSignal(1, "", lcv, idx)

%assign w = LibBlockOutputSignal(2, "", lcv, idx)

%<u> = %<V> * (cos(%<alpha>) * (cos(%<beta>));

%<v> = %<V> * (sin(%<beta>));

%<w> = %<V> * (sin(%<alpha>)) * (cos(%<beta>));

%endroll

%endfunction

Has anybody encountered this issue before? Any help would be great.

Thanks in advance.

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Code generation of an S-function with multiple inputs and outputs

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