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基于ARM的GPRS无线数据终端设计.doc
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基于ARM的GPRS无线数据终端设计.doc
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时间: 2012 年 6 月 5 日
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摘要
随着嵌入式系统和GPRS无线网络的发展,GPRS无线数据终端为工业
生产中的远距离数据传输带来了更佳的传输途径,摆脱了有线数据传输的
局限性,极大地节省了后期维护费用,降低了成本,满足了日益增长的工
业需求。GPRS 无线数据终端的研究具有广泛的意义和良好的商业前景。
本文主要设计并实现基于ARM的GPRS无线数据终端。该系统以ARM7
系列微处理器为核心,通过AT指令控制自带有完整TCP/IP协议栈的无线数
据模块。结合GPRS通信网络的特点分析无线数据传输嵌入式系统的设计过
程,给出系统的具体实现方案,提出硬件、软件系统的设计流程、开发要
点和实现过程。
本系统经过几个月的设计制作,较好的完成了 无线数据终端的各项
功能。
关键词:GPRS;嵌入式;ARM;AT 指令;TCP/IP 协议
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ABSTRACT
With the development of embedded systems and GPRS wireless network,
GPRS wireless data terminals has brought a better way of transmission for
long-range data transmission in industrial production, getting rid of the
limitations of wired data transmission, saving significantly in the later
maintenance costs , reducing costs and meeting the growing industrial demand.
The research of the GPRS wireless data terminal has broad meanings and good
business prospects.
The paper mainly designs and implements the GPRS wireless data terminal
based on ARM. The system depending on ARM7 family microprocessor can
control wireless data module with a complete TCP / IP protocol stack through
AT commands. Make an analysis of the design process of the embedded system
for wireless data transmission, combined with GPRS communication network
characteristics and give a specific system implementation including: the
hardware and software design process, development points and the
implementation process.
The design is completed for several months, implementing various
functions of the wireless data terminal.
Key words: GPRS; Embedded; ARM; AT command; TCP / IP protocol
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目 录
1 绪论 ................................................................................................1
1.1 研究背景................................................................................................1
1.2 通讯方式的现状....................................................................................2
1.3 研究具体任务和目的............................................................................4
2 系统总体方案设计 ........................................................................6
2.1 系统功能要求........................................................................................6
2.2 系统组成................................................................................................6
2.3 系统主要器件选型................................................................................7
2.2.1 主控器件的选择.........................................................................7
2.2.2 无线模块的选择.........................................................................9
2.3 软硬件开发工具选择............................................................................9
2.4 系统语言与模块化结构......................................................................10
2.4.1 AT 指令集 .................................................................................10
2.4.2 C 语言程序模块化设计 ............................................................11
3 硬件电路设计 ..............................................................................12
3.1 电源电路设计......................................................................................12
3.1.1 电源芯片选择...........................................................................12
3.1.2 电源电路具体设计...................................................................12
3.2 主控外围电路......................................................................................14
3.3 串口通信电路......................................................................................15
3.4 电平转换电路和部分指示电路..........................................................17
3.5 无线模块外围电路设计......................................................................18
3.5.1 无线模块插板电路...................................................................18
3.5.2 SIM 卡电路................................................................................19
3.6 存储模块电路设计..............................................................................20
4 软件程序设计 ..............................................................................22
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4.1 软件总体设计主流程..........................................................................22
4.2 系统初始化..........................................................................................23
4.2.1 系统中断初始化.......................................................................23
4.2.2 主频配置...................................................................................24
4.2.3 UART 初始化............................................................................26
4.2.4 定时器初始化...........................................................................27
4.2.5 I2C 初始化与铁电存储.............................................................28
4.2.6 参数配置初始化设计...............................................................31
4.3 TCP 网络连接 ......................................................................................31
4.3.1 TCP/IP 简述...............................................................................31
4.3.2 TCP 连接的建立、维护与拆除 ...............................................31
4.3.3 系统 TCP 网络连接过程 .........................................................33
4.4 数据解析..............................................................................................34
4.5 数据的接收缓存处理..........................................................................35
4.6 上下行数据传输..................................................................................36
5 系统调试 ......................................................................................37
5.1 硬件调试..............................................................................................37
5.2 软件调试..............................................................................................38
6 总结与展望 ..................................................................................39
6.1 总结......................................................................................................39
6.2 展望......................................................................................................41
参考文献 ..........................................................................................43
致谢 ..................................................................................................45
附录 1 ...............................................................................................46
附录 2 ...............................................................................................47
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