程序将键盘输入的模拟量转化为数字量，识别具体的键值并进行显示。识别键值时的分界标准根据不同的键盘硬件而不同，具体应用时可以测定之后转化为数字量后再应用。-Keyboard input program into a digital analog to identify specific keys and displays. Identify the boundaries of standard keys when the keyboard according to different hardwa