多功能函数信号发生器的系统软件设计

论文编号:ZD1072    论文字数:12127,页数:42

摘  要
 在科学研究、工程教育及生产实践中，如工业过程控制、教学实验、机械振动试验、动态分析、材料试验、生物医学等领域，常常需要用到低频信号发生器。而在我们日常生活中，以及一些科学研究中，锯齿波和正弦波、矩形波信号是常用的基本测试信号。函数发生器作为一种通用的电子仪器，在生产、科研、测控、通讯等领域都得到了广泛的应用。但市面上能看到的此类仪器在频率精度、带宽、波形种类及程控方面都已不能满足许多方面实际应用的需求。加之各类功能的半导体集成芯片的快速生产，都使我们研制一种高精度、宽频带，能产生多种波形并具有程控等多功能函数发生器成为可能。本次设计的是一种基于直接数字频率合成技术（DDS）的低频率信号发生器。此设计硬件电路结构简单，软件控制灵活，输出信号频率稳定，分辨率高。 这样的机器体积小，价格便宜，耗电少，频率适中，便于携带。

关键词：信号发生器、高精度、高分辨率、低成本

Abstract
 In scientific research, engineering education and production practice, such as industrial process control, teaching experiments, mechanical vibration, dynamic analysis, material testing, biomedical and other fields often need to use low-frequency signal generator. In our daily lives, and some scientific research, sawtooth and sine wave, square wave signals are commonly used in the basic test signals. Function generator as a generic electronic equipment, in production, scientific research, monitoring and control, communications and other fields have been widely used. But the market can see the accuracy of such equipment in the frequency, bandwidth, waveform types and program-controlled areas have been unable to meet the needs of practical applications in many areas. Combined with various types of semiconductor integrated chip features the rapid production, have enabled us to develop a high-precision, wide bandwidth, and can produce a variety of waveforms such as multi-function generator with programmable possible. The design is based on direct digital frequency synthesis (DDS) in the low-frequency signal generator. The design of hardware circuit structure is simple and flexible software control, the output signal frequency stability, high resolution. This machine is small, cheap, low power consumption, frequency of moderate, and easy to carry.
 
Keywords：Signal generator,  High Precision, High resolution, Low cost

目 录
摘要……………………………………………………………………………. . .……….……...Ⅰ
Abstract………………………………………………………………………………II
第一章 前言………………………………………………………………………………..…....1
第二章 总体设计方案……………………………………………………………………... .. .2
2.1  系统总体结构……………………………………………………………………………2
2.2  系统硬件结构……………………………………………….……………………....... . .2
2.3  系统总体软件流程……………………………………………………………. . ..…..…4
第三章 各个重要硬件及芯片概况…………………………………………...………...…...5
3.1 瑞萨R8C/1B单片机的内核及其外设特点…………………………...……...………….5
  3.1.1  R8C/1B单片机的特点及优势…………………………………….…………….5
  3.1.2  R8C/1B单片机的结构图和引脚图…………………………………..…...…….7
 3.1.3  R8C/1B单片机性能概要………………………………………….….……...….9
 3.2  可编程波形发生器AD9833…………………………………………………..……..…10
 3.2.1  可编程波形发生器AD9833的概述……………………………….....……..…10
 3.2.2  可编程波形发生器AD9833的功能及其工作原理……………….……..……11
  3.3  显示屏HB128*128M1A……………………………………………………....…..……13
  3.3.1  HB128*128M1A的概述……………………………………….….…….….…..13
  3.3.2  HB128*128M1A与单片机的连接……………………………...…….……..…13
第四章 各个模块以及主程序和调用子程序的软件编程……………………….……..15
 4.1 单片机底层驱动程序………………………………………………..……………..……15
  4.1.1  系统时钟程序…………………………………………………..……….……....15
  4.1.2  I/O口配置初始化程序………………………………………………...…..……16
        4.1.3  定时器X初始化程序………………………………………………….…….....16
 4.1.4  AD9833初始化程序…………………………………………………….…...…16
 4.1.5  UART口初始化程序…………………………………………………….……..17
 4.1.6  单片机内部A/D转换器初始化程序…………………………………….…….17
 4.2  AD9833的接口和配置程序………………………………………………..….………18
  4.2.1  AD9833清零操作程序………………………………………………………...18
     4.2.2  AD9833写数据操作程序……………………………………………………...19
     4.2.3  AD9833加载波形程序……………………………………………….………..20
4.3  系统主程序………………………………………………………………...…………...21
第五章 各个模块以及程序的软件调试……………………………………..……..25
 5.1  R8C/1B单片机开发工具概述…………………………………………………………25
 5.2  集成开发环境HEW(High-perfomance Embedded Workshop) ………...……………25
 5.2.1 HEW窗口说明…………………………………………………………...…,..…25
 5.2.2 新工作空间的创建……………………………………………………………26
5.3  硬件工具RU-Stick …………………………………………………...………………29
第六章 程序烧入样机调试……………………………………………….…………………34
 6.1  样机调试出现的问题及其解决………………………………………………….……34
 6.2  项目设计的改进方向…………………………………………………….……………34
第七章 总结…………………………………………………………………………...….…….35
致谢…………………………………………………………………………….…. …….…..…...36
参考文献………………………………………………………………………………………....37
附录…………………………………………………………………………………………….....38