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function syncFreq = PR650getsyncfreq
% syncFreq = PR650getsyncfreq
%
% Measure sync frequency for source. Returns
% empty if can't sync.
%
% 8/20/10 Change error message to match command sent by this routine.
global g_serialPort g_useIOPort;
% Check for initialization
if isempty(g_serialPort)
error('Meter has not been initialized.');
end
% Initialize
timeout = 30;
% Flushing buffers.
% fprintf('Flush\n');
dumpStr = '0';
while ~isempty(dumpStr)
dumpStr = PR650serialread;
end
% Make measurement
% fprintf('Measure\n');
if g_useIOPort
IOPort('write', g_serialPort, ['f' char(10)]);
else
SerialComm('write', g_serialPort, ['f' char(10)]);
end
waited = 0;
inStr = [];
while isempty(inStr) && (waited < timeout)
WaitSecs(1);
waited = waited + 1;
inStr = PR650serialread;
end
if waited == timeout
error('No response after f command');
end
% Pick up entire buffer. This is the loop referred to above.
readStr = inStr;
while ~isempty(inStr)
inStr = PR650serialread;
readStr = [readStr inStr];
end
% 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
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