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function retval = PR655init(portNumber)
% retval = PR655init(portNumber, [enableHandshaking])
%
% Initialize serial port for talking to colorimeter.
% Returns whatever character is sent by colorimeter
%
% Per PhotoResearch, handshaking is disabled.
%
% 11/26/07 mpr added timeout if nothing is returned within 10 seconds.
% 01/16/09 tbc Adapted from PR650Toolbox for use with PR655
%
% It seems the iterative CMCheckInit method of initialization is not
% necessary with the PR655, so one run of this seems to do the trick.
% "usbmodem*" seems to cover every instance I've run into. Not sure about
% the prevalance of using usbmodem as a generic identifier, but if you can
% afford the PR655, you're probably on some more respectable form of internet
% connection. -TBC
%
global g_serialPort;
if nargin == 0
% This seems to be the default name on OS/X. We don't know about other
% operating systems defaults:
portNumber = FindSerialPort('usbmodem', 1);
end
% Only open if we haven't already.
if isempty(g_serialPort)
% IOPort has above port settings 9600 baud, no parity, 8 data bits,
% 1 stopbit, no handshake (aka FlowControl=none) already as
% built-in defaults, so no need to pass them:
oldverbo = IOPort('Verbosity', 2);
if IsOSX
% Must flush on write, ie., not don't flush on write, at least with PR655
% on OSX 10.10, as reported in forum message #19808 for more reliable
% connections:
g_serialPort = IOPort('OpenSerialPort', portNumber, 'Lenient DontFlushOnWrite=0');
else
% On at least Linux (status on Windows is unknown atm.), we must not flush
% on write - the opposite of OSX behaviour (see forum msg thread #15565):
g_serialPort = IOPort('OpenSerialPort', portNumber, 'Lenient DontFlushOnWrite=1');
end
IOPort('Verbosity', oldverbo);
end
% Put in Remote Mode --No [CR] after 'PHOTO'
rm = 'PHOTO';
for i = 1:5
IOPort('write', g_serialPort, rm(i));
end
StartTime = GetSecs;
retval = [];
while isempty(retval) && GetSecs-StartTime < 10
retval = PR655read;
end
return;
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