/usr/share/psychtoolbox-3/PsychHardware/PR655Toolbox/PR655write.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | function PR655write(cmdStr)
% Write a string of chars to PR655. Add [CR] terminator if necessary
%
% 01/16/09 tbc Wrote it.
%
global g_serialPort;
% Check for Terminator and add if necessary
if cmdStr(end)~=char(13)
cmdStr = [cmdStr char(13)];
end
% Write sequence of chars to PR655
for i = 1:length(cmdStr)
IOPort('write', g_serialPort, upper(cmdStr(i)));
pause(0.05)
end
return
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