用AT89C52演奏音乐，并带有跑马灯。可用Proteus 仿真运行。

i2c总线的verilog代码，绝对好用-i2c bus Verilog code, the absolute ease of use

（1）频率测试功能：测频范围0.1H~200H。 测试精度：恒为百万分之一。 （2）脉宽测试功能：范围0.1us~1s，精度0.01us。 （3）占空比测试功能。-(1) the frequency of test functions: the scope of testing frequency 0.1H ~ 200H. Test accuracy: Constant for the parts per million. (2) pulse-width test functions: the scope of 0.1us ~ 1s, the accuracy of 0.01us. (3) duty cycle testing.

基于s3c44b0的一个linux影像文件，可直接下载到s3c44b0板上运行-s3c44b0 a linux document imaging, can be downloaded directly to the board running s3c44b0

arm嵌入式系统lpc22**错误的喂狗产生中断源代码-arm embedded system lpc22** wrong喂狗generate an interrupt source

嵌入式实时系统中的优先级反转问题-embedded real-time system of priority inversion problem

用过EMC芯片的朋友都知道EMC的指令系统属于精简指令集（57条指令），这在做一些小程序时是非常方便的，但是如果程序较大，你就会发现，好多精力都被浪费在编写一些相似的指令上了，能否从中解脱出来呢？其实，如果你能善用EMC的宏指令，往往提高写程序的速度，并增加程序的可读性和可维护性-EMC Friend chips used all know EMC directive system are reduced instruction set (57 instructions), which make some small program is very convenient, but if a larger program, you will find that a lot of energy have been wasted in the preparation of some similar instructions on the can extricate themselves from it? In fact, if you can make the best use of EMC macros are often written procedures improve the speed and increase the program readability and maintainability

应用案例，一个基于RC500芯片的中文液晶考勤机控制程序，与计算机使用RS232接口，该方案特点是考勤数据全部存储在计算机上，读取后返回给CPU处理送到液晶显示。-This is my teacher wrote RGELS algorithm, suitable for system identification of the beginners

这是UNIX的练习作业，能完成简单的ls功能 请高手指教-This is the UNIX operating practice, complete a simple function 19:56 ls enlighten

对FreeRTOS的实现进行了说明，包括TCB调度的实现原理，以及任务通信对象的介绍。

Quartus II的TCL脚本的教程，对学Quartus非常有用。-Quartus II of the TCL script tutorial, very useful for school Quartus.