Matlab serial data acquisition

This experiment involves reading data from the COM2 port of a computer and saving it into a text file for further analysis. Below is the MATLAB script used for this purpose:

%Name: Matlab serial port - Lab1

% Description: Reading from and writing to a serial port, saving data to a TXT file

s = serial('com2');

s.BytesAvailableFcnMode = 'byte'; % Set the byte-based function mode

s.InputBufferSize = 4096;

s.OutputBufferSize = 1024;

s.BytesAvailableFcnCount = 100;

s.ReadAsyncMode = 'continuous';

s.Terminator = 'CR';

fopen(s); % Open the serial port

out = fread(s, 10, 'uint8'); % Read 10 characters at a time

fprintf('%3c', out); % Output one character in three-bit format

fid = fopen('serial_data.txt', 'w+'); % Open the file in read-write mode

fprintf(fid, '%3c', out); % Write the data to the file

fclose(fid);

fclose(s);

delete(s);

% Function to open a serial port

function scom = OpenSerial(sname, HReadFcn)

scom = serial(sname);

scom.BytesAvailableFcnMode = 'terminator';

scom.Terminator = ' ';

scom.BytesAvailableFcn = HReadFcn;

try

fopen(scom);

catch

fprintf('%s failed to open.\n', sname);

end

fprintf('%s successfully opened.\n', sname);

end

% Function to write to the serial port

function WriteSerial(scom, str)

fprintf(scom, str, 'async'); % Send data asynchronously

end

% Callback function for reading data

function ReadFcn_Com2(obj, ~)

n = get(obj, 'BytesAvailable');

if n > 0

a = fread(obj, n, 'uchar');

c = char(a');

fprintf('%s', c);

end

end

% Function to close the serial port

function CloseSerial(scom)

try

fclose(scom);

catch

fprintf('%s shutdown failed.\n', scom.Name);

return

end

delete(scom);

end

In the MATLAB command window, enter the following command to open COM2:

>> scom = OpenSerial('com2', @ReadFcn_Com2);

Com2 opened successfully.

Now, send data to COM2:

>> WriteSerial(scom, 'Hello!');

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