> Sometimes when the master activates the slave, the slave may already be in
> that position and the _done line will already show high (finished), never
> showing (low)busy.  Here is a piece of the code that the Master uses to
talk
> to slave. Does this piece of code require that it sees the "low" first
then
> exits when it goes "high"?

I haven't looked at your code, but it might be simpler to have a valve
open/closed line instead of command busy/done line.  That way you not only
know when the slave has finished a command, but you also always know what
state the valves are in.  If the master ever commands a slave to open its
valve and that valve is already open, then the slave will do nothing and the
master sees the command completing immediately.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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