LYS-51 development board based on a matrix keyboard driver, including the ranks of scan-based implementation, interrupt scan implementation, as well as simple calculators and lock procedures.

矩阵键盘行列扫描.c
矩阵键盘简易计算器.c
矩阵键盘密码锁.c
矩阵键盘中断扫描.c

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