在Windows CE 5.0(简称WinCE 5.0)环境下开发GPS相关程序,是一项涉及嵌入式系统、通信协议、地理位置服务等多个技术领域的任务。WinCE是微软推出的一个实时操作系统,常用于掌上设备、车载信息娱乐系统以及工业自动化设备等。在这个环境中,GPS程序的开发涉及到对串口通信、GPS信号解析以及GPRS网络连接等多个关键环节。 关于串口通信。在WinCE 5.0中,串口通信是设备之间交换数据的一种常见方式,特别是在GPS接收器与主机之间。开发者需要利用WinCE提供的API函数,如CreateFile、DeviceIoControl等,来打开、配置和读写串口。串口设置通常包括波特率、数据位、停止位和校验位。对于GPS接收器,通常使用标准的4800或9600波特率,8位数据位,1位停止位,无校验或偶校验。 接下来,GPS信号处理。GPS信号由卫星发射,包含位置、时间和其他导航信息。这些信号被接收器捕获后,需要通过NMEA(National Marine Electronics Association)协议进行解析。NMEA 0183是广泛使用的标准,它定义了一系列的句子(如$GPGGA、$GPGLL等),每个句子包含特定的数据字段。开发者需要编写代码解析这些字符串,提取出纬度、经度、高度、时间戳等信息。 GPRS(General Packet Radio Service)拨号上网则涉及到移动通信领域。GPRS允许设备通过蜂窝网络进行数据传输,为GPS程序提供网络服务,如获取在线地图、天气预报或者实时交通信息。在WinCE 5.0中,这通常需要使用PPP(Point-to-Point Protocol)协议建立连接,并且可能需要与SIM卡管理、APN设置等相关操作。开发者需要了解如何配置网络连接,使用RAS(Remote Access Services)API进行拨号,并处理网络连接的状态变化。 在www.pudn.com.txt和gmark这两个文件中,可能包含了程序源代码、文档资料或者是关于如何配置和运行程序的说明。"www.pudn.com.txt"可能是从Pudn网站下载的资源说明,而"gmark"可能是GPS标记或者位置记录相关的程序或库文件。具体的内容需要查看文件才能确定。 开发一个在WinCE 5.0环境下的GPS程序,需要深入理解串口通信、GPS信号解析、NMEA协议以及GPRS网络连接。同时,熟悉WinCE的API调用,以及具备一定的编程能力,如C++或C#,都是必不可少的。通过这样的程序,用户可以在手持设备或者车载系统上获取精确的地理位置信息,甚至实现导航、跟踪等功能。
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- 1
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- qiangbird2013-03-30下了之后没用过 不过有源代码很不错
- hit19992011-12-19工程用vs2005无法转化,要消化代码的
- asdsafasdfgh2011-09-24这个是源代码。挺不错的。
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