MATLAB: Make an array of incoming serial data using bytesAvailablefcn

Question

Hi,

I am using bytesAvailablefcn to collect data from serial port. I would like to make an array of incoming data. I could achieve it using global variables. I would like to do the same thing without using global variables. I will highly appreciate if anyone can help me with this.

Thanks in advance !

global dataArray
dataArray = zeros(1,5);
if ~isempty(instrfind)
    fclose(instrfind);
    delete(instrfind);
    pause(0.1)
end
s = serial('COM17');
s.DataBits               = 8;
s.StopBits               = 1;
s.BaudRate               = 115200;
s.Parity                 = 'None';
s.InputBufferSize        = 2^20;            
s.BytesAvailableFcnMode  = 'byte';
s.BytesAvailableFcnCount = 7;
s.ByteOrder              = 'bigEndian';
s.BytesAvailableFcn      = {@collectData};
fopen(s);
flushinput(s);
pause(10)
fclose(s);
delete(s);

—————————————————————————————–

function collectData(obj,event)
global dataArray
ID = fread(obj,6,'uint8');
data = fread(obj,1,'int8');
dataArray(1) =[] ; 
dataArray(end+1) = data;
end

Answer 1

http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.3F

In your situation I would tend towards using nested functions with a variable shared between them.