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function [xyz,qual] = PR655measxyz
% [xyz,qual] = PR655measspd
%
% Make a measurement of the spectrum.
%
% 01/16/09 tbc Adapted from PR650Toolbox for use with PR655
%
global g_serialPort;
% Check for initialization
if isempty(g_serialPort)
error('Meter has not been initialized.');
end
% Initialize
timeout = 30;
% See if we can sync to the source
% and set sync mode appropriately.
syncFreq = PR655getsyncfreq;
if ~isempty(syncFreq) && syncFreq ~= 0
PR655write('SS1');
else
PR655write('SS0');
disp('Warning: Could not sync to source.');
end
% Make measurement and get the string;
readStr = PR655rawxyz(timeout);
% Check returned data.
idx = findstr(readStr, ',');
qual = str2num(readStr(1:idx(1)-1));
% Check for other error conditions
if qual == -1 || qual == 10
%disp('Low light level during measurement');
%disp('Setting returned value to zero');
xyz = zeros(3,1);
elseif qual == 18 || qual == 0
units = str2num(readStr(idx(1)+1:idx(2)-1));
if units ~= 0
error('Units not returned as cd/m2');
end
xyz = str2num(readStr(idx(2)+1:end))';
elseif (qual ~= 0)
error('Bad return code %g from meter',qual);
end
return
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