Codeserialport

% Code to use CNI Tablet using serial port % % Aim: Simply outputs x and y coordinates from the tablet. % % Written by Manish Saggar (saggar@stanford.edu) on 3/26/2012 function tabletCodeSerialPort()  % change the path below for location of tablet mount, usually in  % /dev/...  % NOTE: on Linux, you may need to create a symbolic link for matlab to find the port location; see here for more info http://www.mathworks.com/support/solutions/en/data/1-3ZT8GP/index.html?product=ML&solution=1-3ZT8GP s = serial('/dev/cu.usbmodem12341','BaudRate',57600); fopen(s); c = onCleanup(@()letscleanup(s));  % screen resolution theRect = [0 0 1200 800]; while(1) ln = fgets(s); if size(ln,2) ~=18 || ln(3) == 'N' continue; end x = str2double(ln(3:5)); y = str2double(ln(9:11)); b = str2double(ln(15)); if x <= 0 || y <= 0 continue; end x = floor((x/(850+180))*theRect(3)) y = floor((y/(800+230))*theRect(4)) end fclose(s); delete(s); clear s; end % if Ctrl+C is used this function clears up the pointer of the tablet. % Otherwise Matlab crashes or you need to quit matlab every time. function letscleanup(s)  % clear serial port fclose(s); delete(s); clear s; Screen('CloseAll'); ShowCursor; psychrethrow(psychlasterror); end