/usr/share/psychtoolbox-3/PsychHardware/PR650Toolbox/PR650retrievespd.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 | function [spd,qual,readStr] = PR650retrievespd(filenumber,S)
% [spd,qual,readStr] = PR650rawspd(filenumber,[S])
%
% Retrieve spd stored in given filenumber.
global g_serialPort;
% Set wavelength sampling if passed.
if nargin < 2 || isempty(S)
S = [380 5 81];
end
% Set timeout
timeout = 30;
% Check for initialization
if isempty(g_serialPort)
error('Meter has not been initialized.');
end
% Flushing buffers.
% fprintf('Flush\n');
dumpStr = '0';
while ~isempty(dumpStr)
dumpStr = PR650serialread;
end
% Get the data. In this first loop, we make
% sure something came back from the meter. If
% something did come back, we need to loop (below)
% to pick up the entire buffer, because some serial
% ports seem to be set up so that PsychSerial('Read',...)
% only reads to the EOL char. May be able to change
% this by tweaking PsychSerial, but for now we handle it here.
% fprintf('Get data\n');
SerialComm('write', g_serialPort, ['r' num2str(filenumber) ',5' char(10)]);
WaitSecs(0.1);
waited = 0;
inStr = [];
while isempty(inStr) && (waited < timeout)
inStr = PR650serialread;
WaitSecs(1);
waited = waited+1;
end
if (waited==timeout)
error('Unable to get reading from radiometer');
else
% Pick up entire buffer. This is the loop referred to above.
readStr = inStr;
while ~isempty(inStr)
inStr = PR650serialread;
readStr = [readStr inStr];
end
end
% fprintf('Got data\n');
qual = sscanf(readStr, '%f', 1);
% Check for other error conditions
if qual == -1 || qual == 10
%disp('Low light level during measurement');
%disp('Setting returned value to zero');
spd = zeros(S(3), 1);
elseif qual == 18 || qual == 0
spd = PR650parsespdstr(readStr, S);
elseif qual ~= 0
error('Bad return code %g from meter', qual);
end
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