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function [syncFreq, errorCode] = PR670getsyncfreq
% PR670getsyncfreq - Measures the frequency of the light source.
%
% Syntax:
% syncFreq = PR655getsyncfreq
%
% Output:
% syncFreq (scalar) - The frequency of the light source in Hz. Is empty if
% PR-670 encounters an error.
% errorCode (scalar) - The error code if an error occurs. Is 0 if no
% error.
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 = PR670read;
end
% Take a measurement.
PR670write('F');
% Get the response.
StartTime = GetSecs;
waited = GetSecs - StartTime;
inStr = [];
while isempty(inStr) && waited < timeout
inStr = PR670read;
waited = GetSecs - StartTime;
end
if waited >= timeout
error('No response after measure command');
end
readStr = inStr;
% Parse the return string.
errorCode = -1;
[raw, count] = sscanf(readStr,'%f,%f',2);
switch count
% Error occured
case 1
errorCode = raw(1);
syncFreq = [];
% No error
case 2
errorCode = raw(1);
syncFreq = raw(2);
end
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