密码锁程序,可以设置四位密码，用数码管显示-the program of secret code

矩阵键盘扫描并用I/O口并行输出相应编码-scan matrix keyboard ,and output keycode to I/O port

键盘功能模块 函数名：KeyAction * 描 述：按键动作的实现函数，根据键码执行相应动作-#define _KEY_BOARD_C #include "config.h" #include "main.h" #include "KeyBoard.h" #include "UartCom.h" #include "PCF8591.h"if (buff[0] <= 9) { buff[0]+= 0 } else { buff[0]

该函数使用状态机制实现按键事件，-按键短按，长按，长按累加，不占用mcu资源，是一个很好参考代码。-Button processing function, to achieve a short press, long press, long press the accumulation, the use of state mechanisms, does not occupy MCU, can be a good reference.