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function daq = DaqFind
% Syntax: DeviceIndex = DaqFind
%
% Purpose: To allow various Daq functions to run without explicitly being told
% the index of the daq in PsychHID's enumeration. Works iff there
% is one device.
%
% History: 12/10/07 mpr consolidated calls from other code
% 1/23/08 mpr added second attempt option if No daq found
%
% see also DaqDeviceIndex and DaqReset
persistent BeenToDaqFind;
daq = DaqDeviceIndex;
if isempty(daq)
if isempty(BeenToDaqFind)
TryAgain=TwoStateQuery('Did not find a device, should I clear PsychHID and try again?');
if TryAgain > 0
BeenToDaqFind = 1;
clear PsychHID;
daq = DaqFind;
if isempty(daq)
error('Did not find daq after clearance; are you sure it is connected?');
end
else
error('No daq listed in current PsychHID enumeration.');
end
else
error('No daq found');
end
elseif length(daq) > 1
error('More than one daq found. You must specify one of them.');
end
return;
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