how to enter function into app designer ?

So I want to use UART prtocol into my project . I build the UART protocol ,but I want to use this protocol via appdesigner . So for exmaple I want to write the number In a Numeric Field box and to send this number to the UART protocol . how do I do it ?

this is my UART protocol :

%% Instrument Connection
% Find a serial port object.
obj1 = instrfind('Type', 'serial', 'Port', 'COM3', 'Tag', '');
% Create the serial port object if it does not exist
% otherwise use the object that was found.
if isempty(obj1)
    obj1 = serial('COM3');
else
    fclose(obj1);
    obj1 = obj1(1);
end
% Connect to instrument object, obj1.
fopen(obj1);
%%% Instrument Configuration and Control\
% Communicating with instrument object, obj1.
fwrite(obj1,23 , 'uint8');

in this last line of code :

 fwrite(obj1,23 , 'uint8');

I send the number that I want to send in the UART protocol . But I want to enter this number (for example 23 in this case ) via NumericEditField in the app designer . How to do it ?

Answer 1

[Adam Danz]

"I want to write the number in a Numeric Field box and to send this number to the UART protocol"

From within your app code, these two lines will get the numeric text value and send it to fwrite(). The two lines can be placed in any callback function that responds to interaction with a GUI component. Assuming the numeric text field is named "EditField1",

value = app.EditField1.Value; % or whatever your handle is
fwrite(obj1, value, 'uint8');