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function KbQueueStart(deviceIndex)
% KbQueueStart([deviceIndex])
%
% Starts delivering keyboard events from the specified device to the
% queue.
% _________________________________________________________________________
%
% See also: KbQueueCreate, KbQueueStart, KbQueueStop, KbQueueCheck,
% KbQueueWait, KbQueueFlush, KbQueueRelease
% 8/19/07 rpw Wrote it.
% 8/23/07 rpw Modifications to add KbQueueFlush
if nargin < 1
deviceIndex = [];
end
% Try to check if keyboard queue for 'deviceIndex' is reserved for our exclusive use:
if ~KbQueueReserve(3, 2, deviceIndex) && KbQueueReserve(3, 1, deviceIndex)
if isempty(deviceIndex)
deviceIndex = NaN;
end
error('Keyboard queue for device %i already in use by GetChar() et al. Use of GetChar and keyboard queues is mutually exclusive!', deviceIndex);
end
if nargin == 0
PsychHID('KbQueueStart');
elseif nargin > 0
PsychHID('KbQueueStart', deviceIndex);
end
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