/usr/share/psychtoolbox-3/PsychHardware/PR655Toolbox/PR655getsyncfreq.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
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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 | function syncFreq = PR655getsyncfreq
% syncFreq = PR655getsyncfreq
%
% Measure sync frequency for source. Returns
% empty if can't sync.
%
% 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;
% Flushing buffers.
dumpStr = '0';
while ~isempty(dumpStr)
dumpStr = PR655read;
end
% Make measurement
PR655write('F')
StartTime = GetSecs;
waited = GetSecs-StartTime;
inStr = [];
while isempty(inStr) && waited < timeout
inStr = PR655read;
waited = GetSecs-StartTime;
end
if waited >= timeout
error('No response after measure command');
end
readStr = inStr;
% Parse return
qual = -1;
[raw, count] = sscanf(readStr,'%f,%f',2);
if count == 2
qual = raw(1);
syncFreq = raw(2);
end
if qual ~= 0
syncFreq = [];
end
return
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