There are 1602 LCD display code, and two keyboard scan codes, 3* 3 keyboard enables the display case in English and numbers, punctuation in 1602. Like Nokia cell phones, quickly press a few on the line.

键盘扫描\keyscan.h
........\keyscan_n.h
键盘扫描
........\1602.c
........\control_1602_basic.h

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