Thanks Jeff

I'll look into it. Do you know off-hand if there are any current 
components that do this?

Les


> 
> rtai has shared memory between realtime components and userspace.  This
> is how the communication between task and motion works, and how it works
> between the userspace and realtime parts of scope, sampler, and
> streamer.
> 
> In this case, you'd have to arrange for userspace to load a 1D array of
> f(theta) values before beginning the cam cycle, then the realtime
> f(theta) becomes: find nearest table values to theta, and use an
> interpolation algorithm on those values (such as linear interpolation on
> two values) to give the offset.
> 
> Jeff
> 

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