GUI and COM port interface

Hi, I have a question. May I can I know how to communicate serial com port with GUI push button? For eg: s=serial('COM15')into the GUI push button so when I clicked on it will directly connect to the com port.Thanks in advance.

Answer 1

[Walter Roberson]

Open the serial port and save the resulting object in to a convenient location (such as in a handles structure), and then in the callback for the object, retrieve the stored object and use it to read from or write to.

[MrPuzzled Marc]

Do i need to add in any functions in order to access the code?

[Walter Roberson]

No. You just need to configure and open the port some time before the user becomes able to click on that button -- though if you do it after the GUI is initialized, then your callback routine _might_ have to use handles = getappdata(hObject) in order to get the updated handles structure (if, that is, you store the serial port in the handles structure.)

If your serial port is opened an indefinite time before the callback, then you might want to start the callback by reading and discarding all existing data from the serial port, in case something came through while you were idle.

fread(s, s.BytesAvailable)

[Walter Roberson]

Based upon the code you emailed, you would want to open the serial port in the Connect callback itself.

[MrPuzzled Marc]

I do not get you in the last 2 reply.I seem puzzled. Could you explain more?Do you have any example that can refer?

Thanks.

[MrPuzzled Marc]

I tried using handles=getappdata(serial('COM15')); on the push button M-file.However error occurs. It says conversion of double from serial is not possible.