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# select a function
# select a function
bb.sendMarker(val=(ord(X))) #select pulse time
bb.sendMarker(val=(ord('X'))) #select pulse time
bb.sendMarker(val=2) #set time of dureation pulse to 2ms
bb.sendMarker(val=2) #set time of dureation pulse to 2ms
bb.sendMarker(val=(ord(M))) #select marker out
bb.sendMarker(val=(ord('M'))) #select marker out
bb.sendMarker(val=115) #set marker value 115
bb.sendMarker(val=115) #set marker value 115
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=== Matlab ===
=== Matlab ===
'''Example using markers with the Buttonbox in Matlab:'''
'''Example using markers with the Buttonbox in Matlab:'''
% at the start of your script, reset marker
% at the start of your script, reset marker
samplerate = 500;
samplerate = 500;
pulseLen = 2000/samplerate;
pulseLen = 2000/samplerate; % get pulse time length for a 2 samples delay
bb.sendTrigger(0);
bb.sendTrigger(0);
% send a marker
% send a marker
java.lang.Thread.sleep(pulseLen); % wait long enough for the EEG system to capture the trigger, i.e., 2000/samplerate ms
java.lang.Thread.sleep(pulseLen); % wait long enough for the EEG system to capture the trigger, i.e., 2000/samplerate ms
% reset marker
% reset marker
bb.sendTrigger(0) % Note: if resetting the marker is not possible at this moment in code, you can decide to do this later as long as it has taken place long enough before the next marker has to be sent.
bb.sendTrigger(0) % Note: if resetting the marker is not possible at this moment in code, you can decide to do this later as long as it has taken place long enough before the next marker has to be sent. Another solution using a timer object instead of a simple delay is outlined below.
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samplerate = 500;
samplerate = 500;
pulseLen = 2000/samplerate;
pulseLen = 2000/samplerate; % get pulse time length for a 2 samples delay
% select a function
% select a function
bb.sendTrigger(uint8('X')); % select pulse time
bb.sendTrigger(uint8('X')); % select pulse time
:
:
bb.close();
bb.close();
</syntaxhighlight>
Reset marker using a timer:
<syntaxhighlight lang="matlab" line style="overflow:auto;">
% At the start of your script, define timer object and callback function
pulseTime = 0.004; % trigger pulse duration in s. NB: extra time will be added due to overhead in calling Matlab functions related to the timer event.
resetMarker = timer('TimerFcn',@(x,y)bb.sendTrigger(0),'StartDelay',pulseTime);
% replace the code to send a marker with:
val = 1; % val: this is your marker code, range code 1-255
bb.sendTrigger(val);
resetMarker.start(); % this will call bb.sendTrigger(0) after pulseTime seconds (plus some additional overhead)
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