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daq code storing data problem

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mado on 15 Mar 2014
Edited: mado on 15 Mar 2014
i wrote this code to acquire data from usb6008 and store it when i used just two channels or three and set s.duration =20 it enters a loop of reading and without end however i disconnect the daq
if true
% % Initialization
global Temperature global Irradiance global current global Vref global data
%%get connected devices d = daq.getDevices %create session s = daq.createSession('ni') s1= daq.createSession('ni') %add analog channel s.addAnalogInputChannel('ID',channel num, 'measurement type') s.addAnalogInputChannel('Dev1','ai0', 'Voltage')%irradiance % s.addAnalogInputChannel('Dev1','ai3', 'Voltage')%Temperature s.addAnalogInputChannel('Dev1','ai6', 'Voltage')%current s1.addAnalogOutputChannel('Dev1', 'ao0', 'Voltage') % set rate of scan 1000 scans/second , run for 30 seconds
s.DurationInSeconds =20
%v.TerminalConfig = ' Differential';
v.TerminalConfig = ' SingleEnded';
%aquire data and process
lh = s.addlistener('DataAvailable', @plotData);
%store data
h = s.addlistener('DataAvailable', @storedata);
% Analog Output
ao_value = 2.74;
s.startBackground() s.wait()
delete (lh)
delete (h)
storing code
function storedata(src,event)
persistent tempData;
global data
tempData = [];
plot(event.TimeStamps, event.Data)
tempData = [tempData;event.Data];
data = tempData
xlswrite('collect.xls', data);

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