/usr/share/psychtoolbox-3/PsychHardware/PR670Toolbox/PR670setsyncfreq.m is in psychtoolbox-3-common 3.0.11.20140816.dfsg1-1.
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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 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 | function PR670setsyncfreq(syncFreq)
% PR670setsyncfreq - Sets the sync frequency for the light source.
%
% Syntax:
% PR670setsyncfreq(syncFreq)
%
% Input:
% syncFreq (scalar) - The sync frequency for source. Can be 1 of 3 options:
% 1. 0 - No sync
% 2. 1 - Auto sync
% 3. 20-400 - Frequency in Hz
%
% Notes:
% See also PR670getsyncfreq
global g_serialPort
% 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 = PR670read;
end
% Set the sync frequency.
switch syncFreq
% Turn off sync mode.
case 0
PR670write('SS0');
% Check the response.
checkResponse(timeout, 'No response after SS0 command');
% Auto sync.
case 1
PR670write('SS1');
% Check the response.
checkResponse(timeout, 'No response after SS1 command');
% User defined frequency.
otherwise
% Force the frequency to an integer. Not 100% sure if this is
% required, but the documentation makes it look like only integers
% are allowed.
syncFreq = round(syncFreq);
% Make sure the frequency is legit.
assert(syncFreq >= 20 && syncFreq <= 400, 'PR670setsyncfreq:InvalidFreq', ...
'Invalid sync frequency of %f, must be in the range [20,400]', ...
syncFreq);
% Tell the device we're specifying a user defined frequency.
PR670write('SS3');
% Check the response.
checkResponse(timeout, 'No response after SS3 command');
% Send the frequency over.
PR670write(sprintf('SK%.3d', syncFreq));
% Check the response.
checkResponse(timeout, 'No response after SK command');
end
function checkResponse(timeout, timeoutString)
% checkResponse - Check for a PR-670 response and makes sure it's OK.
waited = 0;
inStr =[];
while isempty(inStr) && (waited < timeout)
WaitSecs(1);
waited = waited+1;
inStr = PR670read;
end
if waited == timeout
error(timeoutString);
end
% Pick up entire buffer. This is the loop referred to above.
response = inStr;
while ~isempty(inStr)
inStr = PR670read;
response = [response inStr]; %#ok<AGROW>
end
% Parse the return and make sure we got a 0. Any other value means an
% error occured.
qual = sscanf(response, '%d', 1);
if qual ~= 0
error('PR670setsyncfreq:Received error code: %d', qual);
end
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