How to create a multi thread gui

2016 4 11
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更新时间：2016 4 12
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Hello how can i plot data real time in a gui?
The code below keeps blocking.I want when i press the close_port_btn the reading to stop. Since i have seen there is no function to get the serial status of the port i created that flag. This flag is intended to stop the reading. Somehow it seems the code won't exit that part of code. Do i need to do multithreading? And if so how can i achieve that?
function read_btn_Callback(hObject, eventdata,handles)
% hObject handle to read_btn (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global port;
fopen(port);
handles.flag=1;
N=100;
y=zeros(N,1);
t=linspace(0,N,1);
while (handles.flag~=0)
y(1:end-1)=y(2:end);
x=fscanf(port,'%d')/100
plot(y,'LineWidth',2);
grid on;
axis([0 100 0 50])
end
guidata(hObject,handles);
function close_port_btn_Callback(hObject, eventdata, handles)
% hObject handle to close_port_btn (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global port;
fclose(port);
handles.flag=0;
guidata(hObject,handles);

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 采纳的回答

Walter Roberson
Walter Roberson 2016-4-11

0 个投票

function read_btn_Callback(hObject, eventdata,handles)
% hObject handle to read_btn (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global port;
fopen(port);
handles.flag=1;
guidata(hObject, handles);
N=100;
y=zeros(N,1);
t=linspace(0,N,1);
while true
drawnow();
handles = guidata(hObject);
if handles.flag == 0
break;
end
y(1:end-1)=y(2:end);
x=fscanf(port,'%d')/100
plot(y,'LineWidth',2);
grid on;
axis([0 100 0 50])
end
fclose(port);
function close_port_btn_Callback(hObject, eventdata, handles)
% hObject handle to close_port_btn (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
handles.flag=0;
guidata(hObject,handles);

3 个评论
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Adrian Bercovici
Adrian Bercovici 2016-4-11
Thank you for your answer.Indeed it stops blocking if you press close port but it won't plot.
Walter Roberson
Walter Roberson 2016-4-11
You initialize your y to N zeros's and in your loop you shrink y by one element each pass through the loop. An all-zero line could easily be mistaken as not being there.
You read data into x in your loop but you do not store or plot that x.
Adrian Bercovici
Adrian Bercovici 2016-4-12
I added a pause and it seems it did the trick however i get this error after closing the port.
I want the reading to be dependent on the status of the port ,handles.port_stt.
*
Error using serial/fscanf (line 154)
Unsuccessful read: OBJ must be connected to the hardware with FOPEN.*
function open_port_btn_Callback(hObject, eventdata, handles)
global myport;
%----------------------Port opening-----------------------%
%
handles=guidata(hObject);
if(~strcmp(handles.port_stt,'opened'))
fopen(myport);
handles.port_stt='opened';
guidata(hObject,handles);
end
% --- Executes on button press in close_port_btn.
function close_port_btn_Callback(hObject, eventdata, handles)
global myport;
%----------------------Port closing-----------------------%
handles=guidata(hObject);
if(~strcmp(handles.port_stt,'closed'))
fclose(myport);
handles.port_stt='closed';
guidata(hObject,handles);
end
% --- Executes on button press in read_btn.
function read_btn_Callback(hObject, eventdata, handles)
global myport;
handles=guidata(hObject);
while(strcmp(handles.port_stt,'opened'))
handles=guidata(hObject);
x=fscanf(myport,'%f')/100
pause(0.0001);
end

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