Matrix scan button design, line matrix inversion method keyboard design, matrix design of the keyboard interrupt scan

5.3 矩阵式键盘的控制
....................\矩阵式中断扫描键盘的设计
....................\........................\中断查询.c
....................\........................\定时查询.c
....................\矩阵式扫描按键的设计
....................\....................\程序扫描.c
....................\矩阵式线反转法键盘的设计
....................\........................\程序扫描（线反转）.c

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