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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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