ComputerVoltageSources

It depends on what latency you want.  The CVS can poll looking for a 
state change on the input.  You can do this on any analog input by 
doing an ADC, but since the input is binary, you could treat this as 
a digital input as long as the input signal has the appropriate 
amplitude to read as a logical 1 when divided by two which is the 
input stage gain.  You have to figure out if the latency is 
tolerable.  Certainly the Aux input can be polled quickly.

Alternatively, I wrote some code that is in my template that can 
generate interrupts on edges for the Aux input, so you can have very 
little latency.  I wrote this so I could detect triggers.  My 
triggers are fast, and if occur when the processor is busy elsewhere 
in the code, are missed.  Edge interrupts always guarantee they are 
sensed.

Dave

--- In ComputerVoltageSources@yahoogroups.com, 
"supisuzoi" <son_of_zoggs@...> wrote:
> My plan is to trigger on any rising edge, and otherwise operate
> independently of what the trigger source is doing, because I want 
the
> CVS itself to define the output's delay time and gate length.
> 
> Cheers,
> Kevin