GPSprogram_from_abroad

说明：  激光键盘软件源代码编译和修改指南源代码1(Laser keyboard software source code compilation and modification Guide source code 1)

CSerialPort.h CSerialPort.c VC++串口通讯类，用于初学串口通讯，及串口通讯原理有一定帮助。(CSerialPort.h CSerialPort.c)

说明：  在软件开发中，特别是驱动开发中，什么时候用const，什么时候又要加volatile，这里有详细的讲解(In software development, particularly driven development, when to use const, when that the increase in volatile, here in detail)

dsp上实现的音频经典混响算法,四个梳状滤波加两个全通滤波器实现(dsp audio to achieve the classic reverb algorithms, 4 comb filter plus two all-pass filter to achieve)

修改硬盘序列号工具,可以用来修改硬盘序列号，对于绑定硬件的有用。(DISKSN TOOLS,FOR DISK SN,FOR WD ,FOR ,MATRIO,FOR SAMSUNG,FOR RI )

windows核心编程，对理解windows的执行过程和操作原理很重要。(Windows core programming is very important for understanding the execution process and operation principle of windows.)

基于C51的电子琴设计，有一个现成的音乐，支持14个不同的音调(C51-based design of the organ, there is a ready-made music, support the 14 different pitch)

USB communication and used to access data from mass storage devices

74HC138驱动数码管程序，驱动4位共阳数码管，阳极全部高电平，138驱动段码(74HC138-driven digital control program)

screen snap:屏幕抓屏源代码。(screen snap : Capturing screen source code.)