Timer interrupt to detect the 4* 4 buttons this program only recognizes the short mode (need to identify long-press mode, clear search the src-V0.1.1-2012-02-041701.rar) has let go of detection. Timing scan mode, no infinite loop code, so the less occupied Cpu resources (key tests are normal)

KeyPro_Main.c
KeyScanPro.c
KeyScanPro.h

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