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function retval = PR650init(portNumber, enableHandshaking)
% retval = PR650init(portNumber, [enableHandshaking])
%
% Initialize serial port for talking to colorimeter.
% Returns whatever character is sent by colorimeter
%
% 'enableHandshaking' allows you to enable handshaking. By default,
% handshaking is disabled. To enable handshaking, set this value to 1 or
% true.
%
% 11/26/07 mpr added timeout if nothing is returned within 10 seconds.
%
% In my experience, calling this function directly leads to poor performance
% (usually no communication is ever established). You should find the function
% CMCheckInit in the PsychHardware folder, one folder up the tree from this one
% (which is presumably PR650Toolbox). Calling this function from CMCheckInit
% should provide more reliable establishment of contact and hints on what to
% try if contact fails. -- MPR
global g_serialPort;
if nargin == 1
enableHandshaking = 0;
end
if enableHandshaking
handshakeCode = 'Lenient DontFlushOnWrite=1 FlowControl=Hardware ';
else
handshakeCode = 'Lenient DontFlushOnWrite=1 FlowControl=None ';
end
% Only open if we haven't already.
if isempty(g_serialPort)
oldverbo = IOPort('Verbosity', 2);
hPort = IOPort('OpenSerialPort', portNumber, handshakeCode);
IOPort('Close', hPort);
WaitSecs(0.5);
hPort = IOPort('OpenSerialPort', portNumber, handshakeCode);
IOPort('Verbosity', oldverbo);
g_serialPort = hPort;
end
StartTime = GetSecs;
% Send set backlight command to high level to check
% whether we are talking to the meter.
IOPort('write', g_serialPort, ['b3' char(10)]);
% Make sure the meter responds.
retval = [];
while isempty(retval) && GetSecs-StartTime < 10
retval = PR650serialread;
end
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