毕业设计(论文)-基于ARM9单片机多功能数字电压表的设计.doc

第 1 章 引言 .....................................................................................3

§1.1 数字电压表设计的两种方案简介 ........................................3

§1.1.1 由数字电路和芯片构成 .................................................3

§1.1.2 单片机系统及内置的 A/D 转换芯片构建 ......................3

§1.2 数字电压表的特点 ...............................................................5

第 2 章 设计需求 .............................................................................6

§2.1 设计目的 ..............................................................................6

§2.2 系统设计 ..............................................................................6

§2.3 设计的功能要求 ...................................................................7

§2.4 应用软件简介.......................................................................8

§3.2 ADC 数模转换 ....................................................................13

§3.2.1 S3C2440ADC 的主要特性 ............................................13

§3.2.2 ADC 转换原理 ..............................................................13

§3.2.3 ADC 相关寄存器 ..........................................................15

§3.2.4 ADC 驱动程序的设计步骤 ...........................................16

§3.3 显示模块 ............................................................................17

§3.3.1 S3C2440 内部 LCD 控制器结构 ...................................17

§3.3.2 TFT LCD 屏显示原理 ................................................17

§3.4 驱动模块 ............................................................................20

§3.4.1 点亮 LED 灯 ................................................................20

§4.1 软件设计总流程图 .............................................................26

§4.2 A/D 转换模块 ......................................................................28

§4.2.1 A/D 转换流程图 ...........................................................27

§4.2.2 A/D 接口设计 ...............................................................28

§4.3 显示模块 ............................................................................29

§4.3.1 显示模块流程图 ..........................................................29

§4.3.2 显示模块接口设计 ......................................................30

§4.4 键盘输入模块.....................................................................34

§4.4.1 键盘输入流程图 ..........................................................34

§4.4.2 键盘输入接口 ..............................................................34

§5.2.1 正常状态下 ..................................................................39

§5.2.2 超压状态下 ..................................................................40

§5.3 误差分析及解决方案 .........................................................41

§5.3.1 误差分析......................................................................41

§5.3.2 解决方案......................................................................41

结　论 ............................................................................................42

参考文献.........................................................................................43

致　谢 ............................................................................................45