本科毕业论文(设计)
题 目：
音频播放器及文本浏览器设计
学 院： 自动化工程学院 专 业： 电子信息科学与技术 班 级： 2008级1班 姓 名： 高 森 指导教师： 章 平
2012年 6 月 10 日
青岛大学本科生毕业论文（设计）
The Design Of Audio Player And Text Browser
青岛大学本科生毕业论文（设计）
摘 要
通过移植FAT32文件系统到单片机，运用单片机的控制功能，从SD卡中读取音频文件和文本文件，分别利用单片机硬件SPI串行数据接口送音频数据到音频解码器解码，实现音频播放功能，和模拟SPI串行数据接口送文本数据到液晶显示器显示，实现文本浏览功能，以及外围时钟芯片、温度传感器实现时间及温度的显示，设计完成了一款实用的多功能播放器。硬件部分主要由单片机、音频解码器、液晶显示模块、SD卡模块四大部分组成。 关键词 单片机 FAT32文件系统 音频解码器 液晶显示 SD卡
Abstract
By transplanting FAT32 file system to the MCU, and using the control functions from it, We can Read audio files and text files from the SD card, and use the single-chip hardware SPI serial data interface to send audio data to an audio decoder decoding, we can realize the audio-play function,also we can simulate the SPI serial data interface to send text data to the LCD display to realize the text browser function, and using the clock chip, temperature sensors, we can realize time and temperature display, sum up above-mentioned functions finally we made a practical multi-function player. The part of hardware were composed of Microcontroller, Audio decoder, LCD module,and SD card module.
Keywords Microcontroller FAT32 file system Audio decoder LCD SD card
青岛大学本科生毕业论文（设计）
目 录
前 言 ............................................................................................................................... 1 第1章 设计内容 ........................................................................................................... 2
1.1 系统设计任务 ...............................................................................................................................2 1.2 总体设计方案论证 .......................................................................................................................2 1.3 音频播放方案论证 .......................................................................................................................3 1.4 文本浏览方案论证 .......................................................................................................................3
第2章 设计思路 ........................................................................................................... 4
2.1 总体设计 .......................................................................................................................................4 2.2 控制部分设计 ...............................................................................................................................5 2.2.1 单片机主要功能特性 ............................................................................................................5 2.2.2 引脚功能及管脚电压 ............................................................................................................6 2.2.3 I/O口 ......................................................................................................................................6 2.2.4 片上资源 ................................................................................................................................8 2.2.5 新增扩展功能 ........................................................................................................................8 2.3 显示部分设计 .............................................................................................................................10 2.3.1 本设计中液晶显示原理 ......................................................................................................10 2.3.2 模块接口说明 ...................................................................................................................... 11 2.3.3 读写时序 ..............................................................................................................................12 2.4 音频解码器 .................................................................................................................................13 2.4.1 MP3文件简介 .....................................................................................................................13 2.4.2 电气特性 ..............................................................................................................................14 2.4.3 相关寄存器设置 ..................................................................................................................14 2.4.4 SPI时序图 ...........................................................................................................................15 2.4.5 模块引脚说明 ......................................................................................................................15 2.5 SD卡模块 ...................................................................................................................................16
第3章 硬件电路设计 ................................................................................................. 17
3.1 单片机模块原理图 .....................................................................................................................17 3.2 LCD12864液晶模块原理图 ......................................................................................................18 3.3 VS1003音频解码器模块原理图 ...............................................................................................18
青岛大学本科生毕业论文（设计）
3.4 SD模块原理图 ...........................................................................................................................19 3.5 DS1302时钟模块原理图 ...........................................................................................................19 3.6 DS18B20温度传感器模块原理图 ............................................................................................20 3.7 按键模块原理图 .........................................................................................................................20 3.8 电源模块原理图 .........................................................................................................................21
第4章 软件设计 ......................................................................................................... 22
4.1 开发环境简介 .............................................................................................................................22 4.2 模块化程序设计 .........................................................................................................................22 4.2.1 FAT32文件系统 ..................................................................................................................23 4.2.2 12864液晶驱动 ...................................................................................................................24 4.2.3 VS1003驱动 ........................................................................................................................25 4.2.4 SD卡驱动 ............................................................................................................................26 4.2.5 DS1302、DS18B20驱动 ....................................................................................................26 4.2.6 UART驱动 ..........................................................................................................................27 4.2.7 其他功能函数 ......................................................................................................................28
第5章 系统调试 ......................................................................................................... 38
5.1 调时功能调试 .............................................................................................................................39 5.2 电子书功能调试 .........................................................................................................................40 5.3 MP3功能调试 ............................................................................................................................41 5.4 游戏功能调试 .............................................................................................................................43
结束语 ............................................................................................................................. 44 谢 辞 ............................................................................................................................. 45 参考文献 ......................................................................................................................... 46 附录一(系统原理图) ...................................................................................................... 47 附录二(部分源程序) ...................................................................................................... 48