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本系统分电压测量和信号产生输出两大部分，电压测量部分以模拟电路为主，配合放大模块、A/D转化模块、显示模块；通过凌阳单片机进行数据处理，在误差允许范围内显示测量电压值。信号产生以直接数字式频率合成器为核心，经过AT89S52对DDS芯片内部进行控制，使之输出标准正弦波形，利用编程实现频率预置、步进，达到电压输出频率的可调节步进。通过调试与测量完成了题目的基本部分和全部发挥部分的要求并有自己的创新。-Voltage measurement points of the system and the output of two major signals, voltage measurement circuitry to simulate the main part, with the amplification module, A/D conversion module, display module through Sunplus Single-chip data processing, in the range of error allowed shows the value of measuring voltage. Signal generated by direct digital frequency synthesizer for the core of the DDS chip AT89S52 after the internal control standards so that the output sine wave shape, frequency of use of pre-programming, step to the output voltage adjustable frequency step. Debugging and measurement, through the completion of the basic part of the topic and all the requirements to play a part and have their own innovation.

uClinux下的CAN总线控制器驱动程序源代码-uClinux under the CAN bus controller driver source code

将AT PS2键盘连接到公共接口的代码：9600波特的串行端口输出，带选通的并行输出或带就绪信号的SPI端口。最初的代码是68HC705J1Ahttp://retired.beyondlogic.org/keyboard/keybrd.htm但我把它移植到了Atmel ATtiny48上，增加了对SPI接口和并行输出的支持，增加了对更多键的支持。ATtiny48使用内部振荡器，只需连接器即可工作。

舵机控制程序，舵机的控制信号为周期是20ms的PWM信号，其中高电平持续时间0.5到2.5ms。-steering control procedure, the servo control signal is 20ms cycle of the PWM signal. margin which lasted 0.5 to 2.5ms.

基于at89s52单片机的歌曲《草原晨曲》C程序。-SCM at89s52 songs on " Prairie morning song" C program.

串口复用协议GSM07.07相关源码，在软件上实现两个串口而实际只有一个物理串口；-Serial multiplexing GSM07.07 agreement related source in the software and the actual realization of the two serial ports that there is only one physical serial port

cc1111 开发程序，学习教材。USB 芯片，开发程序和教材-cc1111 USB development tutorial

uxlinux的bootlaoder学习 整理的一下-uxlinux the bootlaoder learning about finishing

RT-STN-A字库图库串行控制板使用说明.doc-RT-STN-A font library serial control panel instructions. Doc

example MCU interface I2C