Matlab Function in Simulink: Code Generation Error

Hi there,

I am trying to implement the matlab function below (from a .m file) as a function block in simulink. The main gist is that it reads a string from thingspeak, then splits that string into data points.

I am getting errors stating that most of the functions from matlab (split, thingspeak...) are unavailable for code generation.

We cannot use the simulink thingspeak blocks as they only support numeric data, and we are processing large strings.

What can I do to make this work?

function [out0,out1,out2,out3,out4,out5,out6,out7,out8,out9,out10,out11,out12,out13,out14,out15,out16,out17,out18] = fcn()

data = thingSpeakRead(1747813, "Fields",1,"ReadKey","M005PRKFNU6BQ3R3", OutputFormat="timetable");

disp(data)

%defines delimiter

delimiter1 = "*";

delimiter2 = ",";

%converts timetable data into an array so it can be processed below

dataConvert = table2array(data);

%splits string into a 19x1 array

stringSplit = split(dataConvert, delimiter1);

%assigns location within array to variable

val0 = stringSplit(1);

val1 = stringSplit(2);

val2 = stringSplit(3);

val3 = stringSplit(4);

val4 = stringSplit(5);

val5 = stringSplit(6);

val6 = stringSplit(7);

val7 = stringSplit(8);

val8 = stringSplit(9);

val9 = stringSplit(10);

val10 = stringSplit(11);

val11 = stringSplit(12);

val12 = stringSplit(13);

val13 = stringSplit(14);

val14 = stringSplit(15);

val15 = stringSplit(16);

val16 = stringSplit(17);

val17 = stringSplit(18);

val18 = stringSplit(19);

%splits string a second time to a 1x2 array of shape [identifier,value]

splitStringVal0 = split(val0,delimiter2);

splitStringVal1 = split(val1,delimiter2);

splitStringVal2 = split(val2,delimiter2);

splitStringVal3 = split(val3,delimiter2);

splitStringVal4 = split(val4,delimiter2);

splitStringVal5 = split(val5,delimiter2);

splitStringVal6 = split(val6,delimiter2);

splitStringVal7 = split(val7,delimiter2);

splitStringVal8 = split(val8,delimiter2);

splitStringVal9 = split(val9,delimiter2);

splitStringVal10 = split(val10,delimiter2);

splitStringVal11 = split(val11,delimiter2);

splitStringVal12 = split(val12,delimiter2);

splitStringVal13 = split(val13,delimiter2);

splitStringVal14 = split(val14,delimiter2);

splitStringVal15 = split(val15,delimiter2);

splitStringVal16 = split(val16,delimiter2);

splitStringVal17 = split(val17,delimiter2);

splitStringVal18 = split(val18,delimiter2);

%assigns value to output variable to be used by simulink file

out0 = splitStringVal0(2);

out1 = splitStringVal1(2);

out2 = splitStringVal2(2);

out3 = splitStringVal3(2);

out4 = splitStringVal4(2);

out5 = splitStringVal5(2);

out6 = splitStringVal6(2);

out7 = splitStringVal7(2);

out8 = splitStringVal8(2);

out9 = splitStringVal9(2);

out10 = splitStringVal10(2);

out11 = splitStringVal11(2);

out12 = splitStringVal12(2);

out13 = splitStringVal13(2);

out14 = splitStringVal14(2);

out15 = splitStringVal15(2);

out16 = splitStringVal16(2);

out17 = splitStringVal17(2);

out18 = splitStringVal18(2);

end

[Christopher Stapels]

What is your hardware?

[Mark Trudgen]

Windows 11 for simulink

ESP32 for thingspeak data publishing.

[Christopher Stapels]

Simulink is terrific, but they havent made all the functions code gernation capable yet. You can program the ESP32 directly with Arduini IDE in C, we have many examples in our doc to help with that. C has ok string manipulation, though not as easy as the MATLAB functions.