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STM32L-discovery touch sensing

Question asked by Rabbit on Apr 3, 2012

We bought STM32L-Discovery board; there are no documents to describe how the touch sensing function works, so it is very difficult for us to use this function in our application.

In AN3413,  page10 mention “PA6, PA7, PC4, PC5, PB0, PB1 are for touch sensor”, but how it works?  PB0 and PB1 is one pair, PB0 toggling pin and PB1 counting the pulse?

How to design the electrode? I try use scope to view the signal, but it lockup