Communication with PIC Microcontroller

Question

Sabarinathan Vadivelu 2013-8-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/84704-communication-with-pic-microcontroller

I have designed a face recognition system. If the face is recognized, I'm sending a character 'a' via serial port to microcontroller. If the face is not authorized, I'm sending a character 'b' via serial port to microcontroller.

Also, When I switch on the controller, it sends a character 'c' to MATLAB, at that time only it acquires the face image.

I have designed the face recognition system, Now my problem is how can I read the data from Microcontroller?

The code keeps on running and when MATLAB reads a character from serial port, it acquires the image. How to do it?

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Answer 1

Walter Roberson 2013-8-14

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https://ww2.mathworks.cn/matlabcentral/answers/84704-communication-with-pic-microcontroller#answer_94244

serial() to create a port object, fopen() to open it. Configure it with a bytes available count of 1. Configure it to not be in line mode, including configuring the terminator as empty. fread() from the port, requesting 1 character. You can either loop the fread(), "polling" for actions, or you can set the bytes available function to have a call-back when the data is available.

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Sabarinathan Vadivelu 2013-8-14

在 MATLAB Online 中打开

function varargout = Enroll_GUI(varargin)
% ENROLL_GUI MATLAB code for Enroll_GUI.fig
%      ENROLL_GUI, by itself, creates a new ENROLL_GUI or raises the existing
%      singleton*.
%
%      H = ENROLL_GUI returns the handle to a new ENROLL_GUI or the handle to
%      the existing singleton*.
%
%      ENROLL_GUI('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in ENROLL_GUI.M with the given input arguments.
%
%      ENROLL_GUI('Property','Value',...) creates a new ENROLL_GUI or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before Enroll_GUI_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to Enroll_GUI_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES
% Edit the above text to modify the response to help Enroll_GUI
% Last Modified by GUIDE v2.5 12-Aug-2013 18:03:09
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @Enroll_GUI_OpeningFcn, ...
                   'gui_OutputFcn',  @Enroll_GUI_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end
if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT
% --- Executes just before Enroll_GUI is made visible.
function Enroll_GUI_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to Enroll_GUI (see VARARGIN)
% Choose default command line output for Enroll_GUI
handles.output = hObject;
global vid
vid = videoinput('winvideo', 1, 'YUY2_640x480');
src = getselectedsource(vid);
vid.FramesPerTrigger = 1;
vidRes = get(vid, 'VideoResolution'); 
nBands = get(vid, 'NumberOfBands'); 
hImage = image( zeros(vidRes(2), vidRes(1), nBands) ); 
preview(vid, hImage);
vid.ReturnedColorspace = 'rgb';
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes Enroll_GUI wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = Enroll_GUI_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% Get default command line output from handles structure
varargout{1} = handles.output;
% --- Executes on button press in Capture_PushButton.
function Capture_PushButton_Callback(hObject, eventdata, handles)
% hObject    handle to Capture_PushButton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global vid capturedImage faceRegion
capturedImage = getsnapshot(vid);
faceDetector = vision.CascadeObjectDetector();
bboxes = step(faceDetector, capturedImage);
faceRegion = imcrop(capturedImage,bboxes);
faceRegion = rgb2gray(faceRegion);
obj = fspecial('unsharp');
faceRegion = imfilter(faceRegion,obj);
faceRegion = imresize(faceRegion,[400 400]); 
axes(handles.axes1);
imshow(faceRegion)
% --- Executes on button press in Enroll_PushButton.
function Enroll_PushButton_Callback(hObject, eventdata, handles)
% hObject    handle to Enroll_PushButton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global faceRegion
facePoints = detectSURFFeatures(faceRegion,'MetricThreshold',10);
[faceFeatures, facePoints] = extractFeatures(faceRegion, facePoints);
if exist('FaceDatabase.mat','file')
    load FaceDatabase.mat
    count = count + 1;
    SurfFeatures(count).features = faceFeatures;
    SurfFeatures(count).points   = facePoints;
    SurfFeatures(count).face     = faceRegion;
    save FaceDatabase.mat SurfFeatures count
    helpdlg(['Face Enrolled. Face ID : ' num2str(count)],'Success')
else
    SurfFeatures(1).features = faceFeatures;
    SurfFeatures(1).points   = facePoints;
    SurfFeatures(1).face     = faceRegion;
    count = 1;
    save FaceDatabase.mat SurfFeatures count
    helpdlg(['Face Enrolled. Face ID : ' num2str(count)],'Success')
end
% --- Executes on button press in New_PushButton.
function New_PushButton_Callback(hObject, eventdata, handles)
% hObject    handle to New_PushButton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
arrayfun(@cla,findall(0,'type','axes'))
global vid
vid = videoinput('winvideo', 1, 'YUY2_640x480');
src = getselectedsource(vid);
vid.FramesPerTrigger = 1;
vidRes = get(vid, 'VideoResolution'); 
nBands = get(vid, 'NumberOfBands'); 
hImage = image( zeros(vidRes(2), vidRes(1), nBands) ); 
preview(vid, hImage);
vid.ReturnedColorspace = 'rgb';
% --- Executes on button press in Delete_PushButton.
function Delete_PushButton_Callback(hObject, eventdata, handles)
% hObject    handle to Delete_PushButton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
errordlg('Database Deleted','Warning');
delete('FaceDatabase.mat');

This is the code I had wrote.

This code Enrolls a face in the database.

Sabarinathan Vadivelu 2013-8-14

Yes sir, Till that only I had done it. Now I need to know how can I do that above mentioned question.

Walter Roberson 2013-8-14

serial() to create the port object... and so on, as I wrote above.

If you want code examples, search MATLAB Answers for "serial"

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Communication with PIC Microcontroller

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