I'm trying to connect my arduino kit to matlab but it seems that i have error using fread.

function [s, flag] = setupSerial(comPort)

flag = 1;

s = serial(comPort);

set(s, 'DataBits', 8 );

set(s, 'StopBits', 1) ;

set(s, 'BaudRate', 9600 );

set(s, 'Parity', 'none');

fopen(s);

a='b';

while (a~='a')

a=fread(a,1,'uchar');

end

if (a=='a')

disp('serial read');

end

fprintf(s, '%c','a');

mbox = msgbox('Serial Communication Setup'); uiwait(mbox);

fscanf(s, '%u');

end

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above is the code i write for the editor and i keep getting the below error when trying to run the code

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>> comPort = serial('com3');

Warning: serial will be removed in a future release. Use serialport instead.

If you are using serial with icdevice, continue using serial in this MATLAB release.

>> [s, flag] = setupSerial(comPort);

Warning: serial will be removed in a future release. Use serialport instead.

If you are using serial with icdevice, continue using serial in this MATLAB release.

Error using fread

Invalid file identifier. Use fopen to generate a valid file identifier.

Error in setupSerial (line 16)

a=fread(a,1,'uchar');

Answer 1

[Cris LaPierre]

Have you installed the MATLAB Support Package for Arduino Hardware? You can find instructions here.

I suggest going though the Getting Started with MATLAB Support Package for Arduino Hardware to see how it is recommended you connect with and communicate with an Arduino.

[Cris LaPierre]

Additionally, serial is not recommended. If you prefer to take that approach, use serialport instead.

[MUHAMMAD NAJMI HAKIM BIN NASIR]

I have installed all the required support packages bust it still shows the sama error.

[Cris LaPierre]

I figured the best I could do is share what works for me. Here's s snippet of code I use to read a streaming signal from an Arduino using serialport and readlines.

sp = serialport('COM1',115200);
flush(sp);

data = str2double(readline(sp));

delete(sp)
clear sp

It is recommended to not use serial with fread. Use serialport with read instead (or readlines).