8254计数器发声程序

与 arm 微控制器的通用输入的输出接口。 与闪烁 PORTA 使用设置和清除操作和目的端口-A.以 PLL 时钟为公司输入的时钟信号

不同于一般形式的软件编程，嵌入式系统编程建立在特定的硬件平台上，势必要求其编程语言具备较强的硬件直接操作能力。无疑，汇编语言具备这样的特质。但是，由于汇编语言开发的复杂性，它并不是嵌入式系统开发的一般选择。而与之相比，C语言--一种"高级的低级"语言，则成为嵌入式系统开发的最佳选择。-Unlike most forms of software programming, embedded systems programming based on the specific hardware platform, is bound to require its programming language with a strong ability to direct hardware. Undoubtedly, the compilation of language with such qualities. However, the assembly language development complexity, it is not embedded systems development in general choice. But compared with C language-- a "senior vulgar" language, embedded systems development as the best option.

AT91M42800A-LED例子，很好用的！-AT91M42800A-LED example of a good use!

这是一个简单的 C 程序，在 C 中的液晶显示为 8051 的设计说明中给出细节和容易理解

液晶TS1620的程序--Display program for LCD TS1620.

s3c44b0的IIC总线设计.包括读写数据-s3c44b0 design of the IIC bus. including reading and writing data

本书为Linux编程工具书，涵盖了Linux程序开发的方方面面，内容深刻，讲解全面，对于一些高级主题如进程间通信等介绍的比较深入，是一本不可多得的Linux开发的高级参考书。-The book for the Linux programming tool, covering all aspects of Linux development, content depth, on full, for some advanced topics such as inter-process communication, such as described in more in-depth, is a rare high-level reference Linux Development .

应用背景Logical separation of program and data memory All 8051 devices have specific memory organization, they have separate address spaces for Program (ROM) and Data (RAM) Memory. This logical separation of Memory is useful because it allows the Data Memory to be accessed by 8-bit addresses, which can obviously be more quickly stored and manipulated by an 8-bit CPU. Of course, the l6-bit Data Memory addresses can still be generated with the DPTR register. Program Memory Program Memory can only be read, not written to. The address space for 8051 core is 16- bit, so there is maximum of 64K bytes of Program Memory. Up to 4 Kbytes of Program Memory can be on chip, internal Program Memory of the 8051 core. For access to external Program Memory is used signal PSEN (Program Store Enable). Data Memory Data Memory is on a separate address space than Program Memory. For external Data Memo

基于LPC1759用状态机做的CDMA模块AnyDATA DTL518的代码，通过DMA与UART1通信，不占用CPU。主要包括上电时序初始化，拨号连接，短信接收和处理。其中用到cortex-m3的一些库函数，网上很好找

包括boa-0.94.13和cgic205，适合嵌入式web服务器建设-Including the boa-0.94.13 and cgic205, suitable for building embedded web server