synchronize event markers with refresh rate

[David McFarlane]

At 4/15/2011 03:02 PM Friday, Paul Groot wrote:
>Hi Hank,
>
>The OnsetSignal-properties can only address one IO-port at the time
>(all 8 bits at the same time because there is no masking mechanism).

Hmm, couldn't one apply a mask using And or Or in inline code before 
the stimulus object?  E.g., if you wanted to apply only bits 0-2 of 
some other input port, how about something like

'/------------------------------------------------------
' Using Consts in order to avoid "magic numbers" in code:
Const  InPort as Integer = &h1234  ' whatever
Const  OutPort as Integer = &h0378
Const  OutMask as Integer = &h07  ' bits 0-2

StimText.OnsetSignalEnabled = True
StimText.OnsetSignalPort = OutPort
StimText.OnsetSignalData = ReadPort(InPort) And OutMask
'\------------------------------------------------------


Or, if one merely wanted to apply bits 0-2 without affecting any 
other bits, how about

'/------------------------------------------------------
' Using Consts in order to avoid "magic numbers" in code:
Const  OutPort as Integer = &h0378
Const  OutMask as Integer = &h07  ' bits 0-2
Const  OutData as Integer = &h05  ' for example

StimText.OnsetSignalEnabled = True
StimText.OnsetSignalPort = OutPort
StimText.OnsetSignalData = (ReadPort(OutPort) And OutMask) _
     Or OutData
'\------------------------------------------------------

-- David McFarlane, Professional Faultfinder

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