Only one line, in theory can be connected with 16 keys, but not in practice, the key to add a 104 capacitance, to ensure stability. The reference voltage and the reference value of the case judgment are modified in the interruption. If it is in trouble, it can be implemented by a macro definition. Some functions can be annotated if they do not work.

Filename	Size	Update
KeyScan\KeyScan.c	2179	2017-12-19
KeyScan\KeyScan.h	433	2017-12-19
KeyScan	0	2018-01-23

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