SpeedSpread

4.要求:按下矩阵1X4键盘第一个时以1200bps发送1， 第二个时以2400bps发送2， 第三个以4800bps发送3， 第四个以9600pbs发送4.(key)

ov7620摄像头组，freescle智能车上位机测试程序，原理及资料。(OV7620 camera group, freescle smart car upper computer testing procedures, principles and information.)

AT24C128读写，I2C接口编程，I2C接口初始化，读写操作(AT24C128 read and write, I2C interface programming, I2C interface initialization, read and write operations)

WinPcap中文帮助手册，网络编程必备帮助文档，包含了大量的函数。(WinPcap Chinese help manuals, network programming necessary to help document, contains a large number of functions.)

DirectX 的 doc 文件----------------(DirectX, doc file)

此代码可以实现简单的计算功能，如加减乘除，可以帮助初学者学习栈和输入输出的相关应用。(This code can achieve simple calculation functions, such as addition, subtraction, multiplication and division, which can help beginners learn stacks and related applications of input and output.)

AX.25业余无线电数据通信协议通信的实现程序，包括打包和解包。(A program for packeting and unpacking AX.25 protocol.)

说明：  DSP的CPU定时器控制LED源程序，实现循环显示(DSP-CPU timer control LED source to achieve circular display)

本文章是一篇基于单片机应用于门禁系统的文章，具有科普性质的文章。(This article is a microcontroller-based access control systems used in the article, with the nature of science articles.)

12864的DSP显示资料，可用于开发液晶显示(12864 of the DSP display data can be used to develop liquid crystal display)