171007

摘要 电能表作为用电量的测量工具广泛的应用于各种场合。在电能表校表系统中,需要的最基本的输入信号源是高精度双路正弦信号源,并要求可对其频率、相位、幅值进行调节,来对电能表进行校准。 基于单片机的程控信号源设计，运用数字调相、数字调幅和数字调频等技术，要求实现相位、幅度、频率的高精度程控调节。本文设计了一种利用锁相环频率合成技术和数字波形合成技术组成的程控低频正弦波信号发生器，并给出了调幅、调频、调相的实用电路，频率调节通过改变8253计数器的分频系数来实现；相位调节由51单片机预置计数器的计数初值来完成，幅度的调整通过改变DAC1210II的参考电压来实现，使频率分辨率达0.01Hz,相位调节精度达0.1°，并介绍电路中的主要芯的功能及使用。输出正弦波频率和幅值的精度高，稳定性好，失真度低，电路简单、可靠、便于程控。 关键词：数字合成信号源；程控；调幅；调频；移相； (Abstract Meter consumption as the size of the measurement tool is widely used in various occasions. In single-phase power meter verify system, the most basic needs of the input signal is the source of two-way high-precision sine signal source, and may request its frequency, phase, amplitude in a certain step to adjust to the imitate of the actual electricity load with a right meter calibration. Design of the programmable signal supply controlled source，which based on the MCU，including digital phase adjustment，distal amplitude adjustment，digital frequency adjustment etc．The system should achieve high quality digital adjustment of phase, amplitude and frequency. This paper describes the use of a PLL frequency synthesizer technology, and digital wave form synthesis technology consisting of program-controlled low-frequency sine wave signal issued devices, and applies the amplitude， frequency， phase of practical circuit. Frequency can be adjusted through a change in the 8253 counter-frequ)

Thesis on Cogntive radio. It details spectrum sensing

ARM部分实例包括ADS1.2工程和IAR4.40工程两部分(ARM Some examples include ADS1.2 works and works of two parts IAR4.40)

说明：  STM32F103ZET6程序模板，包含IIC,SPI,ADC,串口等的C文件和H文件程序(Stm32f103zet6 program template, including IIC, SPI, ADC, serial port C file and H file program)

说明：  stm32f103软件模拟i2c读写24c02(stm32f103READANDWRITE24c02)

Tinyos系统实用测试调试代码，用于Tinyos串口之间的测试，LED测试(Tinyos practical test system debugging code for testing serial Tinyos between, LED test)

ADC C++ for 9S12XS128 FREESCALE

国外博士毕业论文，水平很高，很清楚的阐明了IMU单元在惯性制导方面的应用，对陀螺仪和加速计的误差进行了分析，非常有条理，读了之后理清了之前的很多疑问，是好文章，推荐给大家(MODELING INERTIAL MEASUREMENT UNITS AND ANALYZING THE EFFECT OF THEIR ERRORS IN NAVIGATION APPLICATIONS)

基于IAR开发环境，野火PIT 配置文件，包含C和H文件(Based on IAR development environment, wildfire PIT configuration file, including C and H files)

基于DSP2812对于挂在一条总线上多个18B20采集温度的程序，通过读取每个18B20不同的64位编码，发送数据匹配编码来确定某个18B20，可以读取温度(Based on DSP2812 hanging on a bus for more than 18B20 temperature acquisition program by reading each 18B20 different 64-bit encoded transmission data to determine a match-coding 18B20, you can read the temperature)