> Is there a way to debounce a switch in S/W?

Lots of ways.  I usually end up with some sort of periodic interrupt anway,
usually every 1mS.  I have the interrupt routine check the input to be
debounced every clock tick, and set a software flag to the new state if the
input was the same some number of samples in a row.  I like to use 50mS for
the debounce time.  In other words, I don't consider the input as having
changed state until it has been the same for 50 consecutive samples at 1mS
per sample.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, olin@embedinc.com, http://www.embedinc.com

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics