% Data read from eZ430-chronos (linux version, Matlab 7.7)
% 2010, Martin Dobrovolny, martin.dobrovolny@upce.cz
% www.martindobrovolny.cz
% Just connect eZ430 to the USB and set the ASINC mode On
% After connect - new device /dev/ttyACM0 must appear (ls /dev/ttyA*)
% -------------------------------------------------------
% 
% IMPORTANT!
% there is a little problem with a Matlab and /dev/ttyACM0 - it cannot be access directly.
% 
% Solution
% 1.) simple solution
%       create link at first!: 
% 
%       sudo ln /dev/ttyACM0 /dev/ttyS101
%       you must do it every time you plug the device in USB
% 
% 2.) complex solution
%        create a java.opts file in the directory you start MATLAB from 
%        with the following line in it (To specify the ports on your system):
% 
%        -Dgnu.io.rxtx.SerialPorts=/dev/ttyS0:/dev/ttyS1:/dev/USB0:/dev/ttyACM0
% 
% Then after you restart MATLAB, the port should be found:
% 
% >> instrhwinfo('serial')
% 
% ans =
% 
%      AvailableSerialPorts: {2x1 cell}
%            JarFileVersion: 'Version 2.7.0'
%     ObjectConstructorName: {2x1 cell}
%               SerialPorts: {2x1 cell}
% 
% >> ans.AvailableSerialPorts
% 
% ans =
% 
%     '/dev/ttyS0'
%     '/dev/ttyACM0'
% 
% -------------------------------------------------------------------------

clear
% SETUP of USB AccessPoint

% port_number='/dev/ttyACM0';   
port_number='/dev/ttyS101';

s = serial(port_number);
    s.BaudRate=115200;
    s.InputBufferSize = 1024;
    s.FlowControl='none';
    s.Timeout=1;
    s.ReadAsyncMode='continuous'; % !!!!!!! important
        if s.Status(1:4)=='open' disp('Closing formerly opened port');fclose(s);end;

    s.ErrorFcn=@mycallback; % not important - you can specify your own error callback


%  Port open
fopen(s);   % you can use exceptions, but better soluton is break on error
            % when there is still problem after first run - try RESTART MATLAB!!!
    instrfind
    get(s)  % display port status and settings

% record(s,'on');





% Header of FRAMEs settings

    StartAccessPoint=[255, 7,3];    % numbers taken from ez430 souce code

    StopAccessPoint=[255,9,3];

    AccDataRequest=[255,8,7,0,0,0,0];


% Start AccessPoint
fwrite(s,StartAccessPoint);     % after cca 1s green LED must blink

disp(['Please turn your watch to sync mode (key #, then key v - LED blinking), then press enter...']);
disp(['CTRL+C to stop']);
pause();
% Read (and store) data




% Main read cycle

stop_flag=0;
i=0;
while stop_flag<100
    i=i+1;
    try
        fwrite(s,AccDataRequest);
        a=fread(s,7,'int8');
    
        X=a(1);
        Y=a(2);
        Z=a(3);
        %     I don't now why, but sometimes the correct assignment is:
        %     X=a(6);
        %     Y=a(5);
        %     Z=a(7);


        data(i,1)=X;
        data(i,2)=Y;
        data(i,3)=Z;



        pozice='X: >                         <       Y: >                         <  Z: >                         <';
        Xmin=5;
        Ymin=42;
        Zmin=74;
        rozsah=24;

        pozice(floor(Xmin+rozsah/2+X/256*rozsah))='*';
        pozice(floor(Ymin+rozsah/2+Y/256*rozsah))='*';
        pozice(floor(Zmin+rozsah/2+Z/256*rozsah))='*';

        disp(pozice);

        % stop on idle     
        if ((X==0) & (Y==0) & (Z==0)) stop_flag=stop_flag+1;end;
        if ((X~=0) | (Y~=0) | (Z~=0)) stop_flag=0;end;

    catch
%         disp('RS232 dropout');
    end;
        
end;
disp(['Sync mode off, or communications lost? -> Game over']);


fwrite(s,StopAccessPoint);

figure;
subplot(3,1,1);stairs(data(1:end-100,1),'Marker','.','LineStyle','none','color','red');  ylabel('X acceleration');
subplot(3,1,2);stairs(data(1:end-100,2),'Marker','.','LineStyle','none','color','green');ylabel('Y acceleration');
subplot(3,1,3);stairs(data(1:end-100,3),'Marker','.','LineStyle','none','color','blue'); ylabel('Z acceleration');