GUI SERIAL COMMUNICATION INTERRUPT FUNCTION

Question

Daniel 2016-4-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/280169-gui-serial-communication-interrupt-function

评论： Jeff King 2018-1-16

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

I want to run a serial communication with a device.

i want all incoming messages to be displayed automatically. don't want to press a special button for that.

i tried using the

handles.serPIC.BytesAvailableFcnCount = @MyInterruptFcn
...
...
...
function MyInterruptFcn(hObject, eventdata)
{code for the interrupt function}
end

but this has no result

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Answer 1

Walter Roberson 2016-4-21

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/280169-gui-serial-communication-interrupt-function#answer_218800

在 MATLAB Online 中打开

handles.serPIC.BytesAvailableFcn = @MyInterruptFcn;
handles.serPIC.BytesAvailableFcnCount = 1;   %or as appropriate
fopen(handles.serPIC)

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Daniel 2016-4-21

在 MATLAB Online 中打开

here is the relevant part of my code:

handles.SerPIC.BytesAvailableFcn = @intcon1;
handles.SerPIC.BytesAvailableFcnMode = 'byte';  
handles.SerPIC.BytesAvailableFcnCount = 1;
 ... some code
function  intcon1(hObject, eventdata, handles)
persistent current_state
persistent L;
persistent i;
persistent DATA;
persistent recieved_checksum;
% current_state = 0;
    *this_input = fread(handles.SerPIC,1);*
    switch current_state
        case 0 % state 0  wait for HEADER_1
            L=0;
            i=0;
            DATA=0;
            recieved_checksum=0;
            if (this_input == 85)
                current_state = 1;  
            else 
                current_state = 0;
            end
        case 1 % state 1  wait for HEADER_2
            if (this_input == 51) %was 170
                current_state = 2;
                recieved_checksum = 136;
            elseif (this_input == 85)
                current_state = 1;
            else
                current_state = 0;
            end 
        case 2 % state 2  wait for message length
             MESSAGE_LENGTH = this_input;
             L=MESSAGE_LENGTH;
             i=1;
             current_state = 3;
             recieved_checksum = mod(recieved_checksum + this_input,255);
        case 3
%         if (s.BytesAvailable == MESSAGE_LENGTH)
            DATA(i) = this_input;
            recieved_checksum = mod(recieved_checksum + this_input,255);
            i=i+1;
            L = L - 1;
            if L > 0
                current_state = 3;
            else
                current_state = 4;
            end
        case 4
              recieved_checksum = recieved_checksum - this_input;
              if (recieved_checksum ==0)
                  set(handles.temp_read,'string',[num2str(DATA(1))])
                  set(handles.voltage_read,'string',[num2str(DATA(2))])
                  set(handles.current_read,'string',[num2str(DATA(3))])
                    current_state = 0;
              else
                  current_state = 0;
              end
    end
        guidata(hObject,handles)
end

i get an error message regarding the callback function: undefined variable handles or class handless.serPIC error... this_input = fread(handles.serPIC,1)

Daniel 2016-4-21

thanks you its working

Jeff King 2018-1-16

Thanks, this post was extremely helpful!

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GUI SERIAL COMMUNICATION INTERRUPT FUNCTION

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