Controlling Raspberry pi using GUI

Dear Fellow MATLABers

Greetings! i hope you are well

My problem is that I am trying to control my raspberry pi that is connected to an L298n motor shield that has 4 inputs to control 2 DC motors,

IN1 and IN2 to control the first one, and IN3 and IN4 to control the second one.

now in order to run for example the first motor forward

i need to set IN1 to high and IN2 to low using the function configurePins(rpi,IN1_pin, 0 or 1)

where :

rpi is the method we connect the raspberry pi to MATLAB so rpi = raspi;

IN1 pin in my case is GPIO 14 so IN1_pin = 14;

here is my code to control 2 dc motors forward for example,

my problem is :

when i try to set the function Forward to a button in my gui, it says that rpi is unknown, i tried to make it global but it didnt work for rpi, it works for the pins because they r doubles, but not the rpi.

second problem is :

i want to use my keyboard arrows to control the motors, ps : uparrow to push forward,, etc

function varargout = keyyyyboard(varargin)

gui_Singleton = 1;

gui_State = struct('gui_Name', mfilename, ...

'gui_Singleton', gui_Singleton, ...

'gui_OpeningFcn', @keyyyyboard_OpeningFcn, ...

'gui_OutputFcn', @keyyyyboard_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 keyyyyboard is made visible.

function keyyyyboard_OpeningFcn(hObject, eventdata, handles, varargin)

handles.output = hObject;

guidata(hObject, handles);

% --- Outputs from this function are returned to the command line.

function varargout = keyyyyboard_OutputFcn(hObject, eventdata, handles)

varargout{1} = handles.output;

% --- Executes on button press in FORWARD.

function FORWARD_Callback(hObject, eventdata, handles)

% hObject handle to FORWARD (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

% Get.handles(FORWARD.'on')

set(handles.FORWARD,'visible','on')

% set(handles.uitable1,'visible','on')

rpi = raspi;

a = 14; b = 15; d = 27; c = 22;

Forward(rpi,a,b,c,d)

% The keypressfcn for the figure.

% --- Executes on button press in BACKWARDS.

function BACKWARDS_Callback(hObject, eventdata, handles)

% hObject handle to BACKWARDS (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

set(handles.BACKWARDS,'visible','on')

% set(handles.uitable1,'visible','on')

rpi = raspi;

a = 14; b = 15; d = 27; c = 22;

Back(rpi,a,b,c,d)

% --- Executes on button press in RIGHT_TURN.

function RIGHT_TURN_Callback(hObject, eventdata, handles)

% hObject handle to RIGHT_TURN (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

set(handles.RIGHT_TURN,'visible','on')

% set(handles.uitable1,'visible','on')

rpi = raspi;

a = 14; b = 15; d = 27; c = 22;

Right(rpi,a,b,c,d)

% --- Executes on button press in LEFT_TURN.

function LEFT_TURN_Callback(hObject, eventdata, handles)

% hObject handle to LEFT_TURN (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

set(handles.LEFT_TURN,'visible','on')

% set(handles.uitable1,'visible','on')

rpi = raspi;

a = 14; b = 15; d = 27; c = 22;

Left(rpi,a,b,c,d)

% --- Executes on button press in STOP.

function STOP_Callback(hObject, eventdata, handles)

% hObject handle to STOP (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

set(handles.STOP,'visible','on')

% set(handles.uitable1,'visible','on')

rpi = raspi;

a = 14; b = 15; d = 27; c = 22;

Stop(rpi,a,b,c,d)

please help me as i am very new to GUIs