Using triggers with software timing

Question

Hello
I'm using the PCI-6259  M
series multifunction DQ board on a linux box (SLES 10.2) and am using
the ansi_c api and the driver is NI KAL 1.4.  My application requires
10 analog inputs, 8 digital inputs 8 digital outputs and all 4 analog
outputs to interface with a piece of HW in real-time.  Currently I am
doing straight software timing meaning I am not using the
DAQmxCfgSampTiming call but am doing "on demand" sampling at a external hw
controlled 1 ms interval using the NI read/write api calls.  I use 4
NIDaq tasks (analog input/output,digital input/output).   I was
attempting to add a analog input trigger to my system to mark a specifi
event.  Here's what I want to do and after reading the NI documentation
I'm not sure I can accomplish this with the NI ansi_c API
I
want to keep the software timing mentioned above in place which is making simple DAQmxRead/Write calls at that above specified 1 ms interval.  I want to ADD to my analog input task a trigger event for APFI1 and assign to it
a callback function when the trigger condition occurs.  From the examples that
comes with the driver (Acq-IntClk-AnlgStart) it looks like the event callbacks are tied to the TASK NOT the trigger.   I don't see how I tie the event callbacks in the API to a specific trigger not the whole task.  I need to be able to access my other anlog inputs "on demand" but want my trigger to fire a callback when the trigger condition occurs.  Also if this is possible what is the latency between the hw event and the execution of the callback?
Kevin

Answer 1

This is a cross-post. See my reply here:
triggers using nidaq-mx
http://forums.ni.com/ni/board/message?board.id=250​&view=by_date_ascending&message.id=54949#M54949
Joe Friedchicken
NI VirtualBench Application Software
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