function varargout = IIRblp(varargin)
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @IIRblp_OpeningFcn, ...
                   'gui_OutputFcn',  @IIRblp_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin & isstr(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

function IIRblp_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
guidata(hObject, handles);

function varargout = IIRblp_OutputFcn(hObject, eventdata, handles)

varargout{1} = handles.output;

function edit1_CreateFcn(hObject, eventdata, handles)

if ispc
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end

function edit1_Callback(hObject, eventdata, handles)
N = str2num(get(hObject, 'String'));
data = getappdata(gcbf, 'UserData');
data.N = N;
setappdata(gcbf, 'UserData', data);

function edit2_CreateFcn(hObject, eventdata, handles)

if ispc
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end

function edit2_Callback(hObject, eventdata, handles)
fc= str2num(get(hObject, 'String'));
data = getappdata(gcbf, 'UserData');
data.fc = fc;
setappdata(gcbf, 'UserData', data);

function edit4_CreateFcn(hObject, eventdata, handles)

if ispc
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end

function edit4_Callback(hObject, eventdata, handles)
fs = str2num(get(hObject, 'String'));
data = getappdata(gcbf, 'UserData');
data.fs = fs;
setappdata(gcbf, 'UserData', data);

function pushbutton1_Callback(hObject, eventdata, handles)
data = getappdata(gcbf, 'UserData');
[b,a] = butter(data.N,data.fc/(0.5*data.fs));
freqz(b,a,128,data.fs)
% xlabel('Normalized frequency');
ylabel('Gain, dB');
y = [b; a];
fid = fopen('blp.cff','w');
fprintf(fid,'%4.14f      %2.14f\n',y);
fclose(fid)

function pushbutton2_Callback(hObject, eventdata, handles)
data = getappdata(gcbf, 'UserData');
[b,a] = butter(data.N,data.fc/(0.5*data.fs));
set(handles.listbox1, 'String', b);

function pushbutton3_Callback(hObject, eventdata, handles)
data = getappdata(gcbf, 'UserData');
[b,a] = butter(data.N,data.fc/(0.5*data.fs));
set(handles.listbox2, 'String', a);

function listbox1_CreateFcn(hObject, eventdata, handles)

if ispc
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end

function listbox1_Callback(hObject, eventdata, handles)

function listbox2_CreateFcn(hObject, eventdata, handles)

if ispc
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end

function listbox2_Callback(hObject, eventdata, handles)
