I get the following error message about too many input arguments in my fprintf function. But it seems to me that just the right amount of arguments were passed.
All this is in the context of a guide GUI I made (see picture at the end).
Error while evaluating uicontrol Callback calibration button hit 20 200 10 10 2520 25197 2520 25197 'C0 2520 25197 10 10' Error using serial/fprintf (line 115) Too many input arguments. Error in UserInterface>StaticCalibrationBtn_Callback (line 202) fprintf(handles.s, 'C0 %s %s %s %s',StartStepsStr,EndStepsStr,Increment,Wait); Here is the code
function StaticCalibrationBtn_Callback(hObject, eventdata, handles) % hObject handle to StaticCalibrationBtn (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) disp('calibration button hit'); Start = str2double(get(handles.CalFromUserTxt, 'string')); % Fetches the user inputed start location in mm and converts to double disp(Start); End = str2double(get(handles.CalToUserTxt, 'string')); % same for End position disp(End); Increment = get(handles.CalUserIncrementTxt, 'string'); % fetches the increment user inputed data as a string disp(Increment); Wait = get(handles.CalUserSpeedTxt, 'string'); % fetches the wait inputed data as a string disp(Wait); StartSteps = round(Start/0.00793750000); % computes the starting step position,double division disp(StartSteps); handles.StartSteps = StartSteps; % creats a place for the start steps inside the handles structure, to be fetched by anythingelsest be saved with guidata(hObject,handles) EndSteps = round(End/0.00793750000); % computes the end step position disp(EndSteps); handles.EndSteps = EndSteps; % stores the end steps to be accessed by anything else must be saved with guidata(hObject,handles) StartStepsStr = num2str(StartSteps); % converts the StartSteps double into a string so it can be sent over serial as a string disp(StartStepsStr); EndStepsStr = num2str(EndSteps); % converts the EndSteps double into a string so it can be sent over serial as a string disp(EndStepsStr); OutputString = strcat('C0' , {' '} , StartStepsStr , {' '} , EndStepsStr , {' '} , Increment , {' '} , Wait); disp(OutputString); fprintf(handles.s, 'C0 %s %s %s %s',StartStepsStr,EndStepsStr,Increment,Wait); and where handles.s comes from
function SerialBtn_Callback(hObject, eventdata, handles) % hObject handle to SerialBtn (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA comPort = get(handles.COMportTxt,'String'); if(~exist('serialFlag','var')) [handles.s, handles.serialFlag] = setupSerial(comPort); end guidata(hObject,handles); end And the setupserial funciton
function [ s, flag] = setupSerial(comPort) %Initialize serial port communication between Arduino and Matlab %Ensure that the arduino is also communicating with Matlab at this time. %if setup is complete then the value of setup is returned as 1 else 0. flag =1; s = serial(comPort); set(s,'DataBits',8); set(s,'StopBits',1); set(s,'BaudRate',9600); set(s,'Parity','none'); fopen(s); a='b'; while (a~='a') a=fread(s,1,'uchar'); end if (a=='a') disp('serial read'); end fprintf(s,'%c','a'); mbox = msgbox('Serial Communication setup.'); uiwait(mbox); fscanf(s,'%u'); end 
USING THE FOLLOWING RESOLVED THE ISSUE
OutputString = sprintf('C0 %s %s %s %s',StartStepsStr,EndStepsStr,Increment,Wait); fprintf(handles.s,'%s', OutputString);