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CC2640的电容按键来如何实现上下滑动以及确认功能

Other Parts Discussed in Thread: CC2640, CC2650

目前想用CC2640的电容按键来实现上下滑动以及确认功能,类似于笔记本的触摸功能。如果实现该功能的话,需要几个按键?原理以及PCB的pad该如何设计?请帮忙回答一下。急需。非常感谢。