简易波形

目 录

摘 要 ....................................................................................................................... I ABSTRACT ............................................................................... 错误！未定义书签。 第1章 引言 .................................................................................................................1 1.1简易波形发生器的发展现状 ..............................................................................1 1.2单片机在低频信号发生器中的应用 ..................................................................1 第2章 系统方案设计 .................................................................................................4 2.1系统方案的比较 ..................................................................................................4 2.2控制芯片的选择 ..................................................................................................6 第3章 硬件电路的设计 .............................................................................................7 3.1总体方案设计 ......................................................................................................7 3.2单片机概述 ..........................................................................................................7 3.3各部分电路设计 ................................................................................................10 3.3.1波形输出控制按键与指示电路的设计 .....................................................10 3.3.2 D/A转换电路的设计 .................................................................................12 3.3.3复位及晶振电路的设计 .............................................................................15 3.3.4电源硬件电路 .............................................................................................17 第4章 软件设计 .......................................................................................................19 4.1主程序设计 ........................................................................................................19 4.2 子程序设计 .......................................................................................................20 4.2.1 锯齿波程序 ................................................................................................20 4.2.2 三角波程序 ................................................................................................21 4.2.3正弦波程序 .................................................................................................21 4.2.4方波程序 .....................................................................................................22 4.2.5延时子程序 .................................................................................................23 第5章 波形测试 .......................................................................................................26 5.1 硬件测试波形 ...................................................................................................26 5.2 各种波形输出结果 ...........................................................................................27 第6章 结论 ...............................................................................................................28 参 考 文 献 ...............................................................................................................29 致 谢 .....................................................................................................................30

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