Matlab和Arduino的连接（四）：在matlab中串口通信发送相关信息至arduino（记录用）

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概述

作用效果：利用matlab的串口将信息发送到arduino端，并根据信息内容执行相应的程序。例如，matlab发送字符‘ssP’，arduino收到P时开始执行（相当于截止字符），提取字符串“ssP”的第一位，如果kk=第一位==‘s’,则开始闪烁灯。

matlab代码

clear;clc;
delete(instrfind({'Port'},{'COM6'}));%断开，释放串口对象占用空间
global s;%建立全局变量s
s = serial('COM6','BaudRate',9600,'DataBits',8);%设定相关的串口参数
fopen(s);
set(s,'BytesAvailableFcnMode','Terminator');
set(s,'Terminator','H');                    %设立中断，当串口检测到字符H时触发中断
s.BytesAvailableFcn =@ReceiveCallback; %中断触发后处理回调的事
for k=1:1:3
    fprintf(s,'lsH');
    pause(0.3);%时间间隔不宜过小
end
function ReceiveCallback(obj,event) %执行回调的函数
global s;
a = fscanf(s);
disp(a);
I = 'I Received';
disp(I);
end

arduino代码

char function_1;
String Indata;
String kk;
void setup() {
 Serial.begin(9600);
 pinMode(13,OUTPUT);
}

void loop() {
if(Serial.available()>0){
  function_1 = Serial.read();
  Indata +=function_1;
  //Serial.print("fggk");
  if(function_1 == 'H'){
    //Serial.print("jgf");
    //Serial.print(Indata);
    delay(20);
    kk = Indata.substring(0,1);//调取字符串的第一个字符
    Serial.print(kk);
    Serial.print("H");

    if(kk =="s")
    {
      for(int i=0;i<5;i++){
      //Serial.print(kk);
      digitalWrite(13,HIGH);
      delay(500);
      digitalWrite(13,LOW);
      delay(500);
      Indata = "";
      }
      }
      if(kk=="l"){
        digitalWrite(13,HIGH);
        delay(4000);
        }
        if(kk=="o"){
         digitalWrite(13,LOW);
         delay(4000);
         digitalWrite(13,HIGH);
         delay(4000);
         Indata="";
          }
    }
  }
}

matlab利用GUI发送串口信息：代码
在这里插入图片描述
Matlab GUI的全部的代码

%%%%利用matlab的GUI控制步进电机的运转方向，角度
function varargout = GUI_steppermotor(varargin)
% GUI_STEPPERMOTOR MATLAB code for GUI_steppermotor.fig
%      GUI_STEPPERMOTOR, by itself, creates a new GUI_STEPPERMOTOR or raises the existing
%      singleton*.
%
%      H = GUI_STEPPERMOTOR returns the handle to a new GUI_STEPPERMOTOR or the handle to
%      the existing singleton*.
%
%      GUI_STEPPERMOTOR('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in GUI_STEPPERMOTOR.M with the given input arguments.
%
%      GUI_STEPPERMOTOR('Property','Value',...) creates a new GUI_STEPPERMOTOR or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before GUI_steppermotor_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to GUI_steppermotor_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 GUI_steppermotor

% Last Modified by GUIDE v2.5 17-Apr-2021 13:42:05

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @GUI_steppermotor_OpeningFcn, ...
                   'gui_OutputFcn',  @GUI_steppermotor_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 GUI_steppermotor is made visible.
function GUI_steppermotor_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 GUI_steppermotor (see VARARGIN)

% Choose default command line output for GUI_steppermotor
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes GUI_steppermotor wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = GUI_steppermotor_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;


function edit1_Callback(hObject, eventdata, handles)
% hObject    handle to edit1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of edit1 as text
%        str2double(get(hObject,'String')) returns contents of edit1 as a double


% --- Executes during object creation, after setting all properties.
function edit1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end


% --- Executes on selection change in popupmenu1.
function popupmenu1_Callback(hObject, eventdata, handles)
% hObject    handle to popupmenu1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: contents = cellstr(get(hObject,'String')) returns popupmenu1 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from popupmenu1


% --- Executes during object creation, after setting all properties.
function popupmenu1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to popupmenu1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: popupmenu controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end


% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)


% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% delete(instrfind({'Port'},{'COM6'}));
% puerto_serial = serial('COM6');%查找通信接口对象并断开。
% puerto.serial.BaudRate = 9600;%设置波特率
% warning('off','MATLAB:serial:fscanf:unsuccessfulRead');%关闭警告信息
% fopen(puerto_serial);%打开串口'TimeOut',10
%fprintf('ff');
delete(instrfind({'Port'},{'COM6'}));
val_1 = get(handles.popupmenu1,'value');
angle_1 = num2str(handles.edit1.String);
switch(val_1)
    case 2
        dir_1 = 's';
    case 3
        dir_1 = 'l';
end

delete(instrfind({'Port'},{'COM6'}));%断开，释放串口对象占用空间
global s;%建立全局变量s
s = serial('COM6','BaudRate',9600,'DataBits',8);%设定相关的串口参数
fopen(s);
set(s,'BytesAvailableFcnMode','Terminator');
set(s,'Terminator','H');                    %设立中断，当串口检测到字符H时触发中断
s.BytesAvailableFcn =@ReceiveCallback; %中断触发后处理回调的事
HH = [dir_1,angle_1,'H'];
disp(HH);
for k=1:1:3
    fprintf(s,HH);
    pause(0.3);%时间间隔不宜过小
end```