ARM嵌入式系统应用技术笔记

函数发生器是一种在科研和生产中经常用到的基本波形产生器，集成函数 波形发生器一般都采用ICL8038或5G8038，而它们只能产生300kHz以下的中低频正弦波、矩形波和三角波，且频率与占空比不能单独调节，从而给使用带来很大不便。本文介绍由LM324和稳压管组成的低频函数波形发生器，该电路能够产生正弦波、方波和三角波信号，频率能以10Hz的间隔在20Hz～20KHz范围内调整。-Function Generator is a scientific research and production often use the basic waveform generator, integrated function waveform generator usually used ICL8038 or 5G8038, and they only have a 300kHz following the low-frequency sine wave, square wave and triangular wave, and frequency and duty cycle alone is not regulated, so as to enable using bring a lot of inconvenience. This paper introduces the LM324 voltage regulator tubes, and the low-frequency waveform generator function, the circuit can produce sine, square and triangular wave signal frequencies of 10Hz to 20Hz at intervals within ~ 20KHz adjustment.

在线编辑WORD文档，及打开服务器上的WORD文档，编辑完成后保存到服务器上-online editing Word documents, and opened on a server Word documents, editing is complete preservation to the server

嵌入式LINUX下应用，多进程地图形显示 UCLINUX，无MMU方式的例子-embedded Linux applications to process more graphics OS, no way of example MMU

该代码用于 GSM module(SIM-900) 与 8051 系列单片机的接口。该代码可以用于将火灾报警消息发送到预定义的数目。

一片关于ARM9处理器的bootloader的分析与设计论文，详细介绍了bootloader的具体结构，以及如何移植到具体的平台上。-On an ARM9 processor bootloader Analysis and Design of papers, detailing the specific structure of the bootloader, and how to migrate to a specific platform.

u-link1，2 原理图，PCB（proteldxp格式），代码-u-link1, 2 schematic, PCB (proteldxp format), code

PLC 电梯程序设计 欧姆龙PLC编程原理-Elevator Omron PLC Programming PLC Programming Principle

at89c51作的一个时钟程序和电路，可作为电子时钟设计的参考，用c51写的程序，protel99se画的电路图，程序均已调试通过，可作为万年历时钟！-at89c51 for the procedure and a clock circuit, as an electronic clock to the reference design, with the decoder written procedures protel99se painting circuit, debugging procedures are adopted, as hefty almanac clock!

使用protel99se开发的单片机电路板，希望有助于各位电路板开发设计的学习-Use protel99se developed microcontroller circuit boards, circuit board you wish to contribute to development and design of learning

一些关于Nios II学习的好资料，很适合初学者-Nios II study on good information, it is suitable for beginners