1)嵌入式WinCE采用周立功的TIPC-700作为硬件平台,主要的硬件资源有S3C2440A处理器,1路带隔离的CAN-bus接口;1路10/100M以太网接口;2个RS-232C串口等。根据核心硬件的要求,定制了所需的WinCE系统内核。在Visual Studio2005集成开发环境中编写应用程序。
2)LPC935单片机是一款单片封装的微控制器,使用低成本的封装形式。它采用了高性能的处理器的处理结构,指令执行时间只需要2到4个时钟周期。6倍于标准80C51器件。它具有集成度高、外围设备丰富,2个4路输入的8位A/D转换器/DAC输出、2个模拟比较器、2个16位定时/.计数器和一个23位系统定时器、增强型UART和SPI通信端口。LPC935集成了许多系统级的功能,大大减少了元件的数目与电路板面积并降低系统的成本。所以在很多领域得到了广泛的应用。
4)每块分板控制4个比色池,每个比色池上有3个检测通道,每块分板可以进行12通道检测,但是每个比色池一次只用使用一个通道进行检测,因此每块分板每次可以同时进行4通道检测,4块分板可以同时进行16通道检测,从而达到了多通道检测的目的,后面的通信协议正是基于此而设计的。
WinCE是一个32位、多线程、多任务的操作系统,采用了***于通常的程序设计语言并且和Windows兼容的API的方式。WinCE有良好的通信能力、相当出色的图形用户界面。WinCE操作系统分为硬件层、OEM适配层、操作系统层、应用支持库、应用开发层、应用集成层。各层之间只能单向依赖或单向调用。从而使功能模块之间的调用关系更加清晰。为了使系统具有更好的可扩展性和更清晰的结构,WinCE系统往往需要定制。
WinCE提供了一个工具PB(PlatformBuilder),是WinCE的主要集成开发环境,通过这个工具可以方便地根据不同的硬件,定制、裁剪出符合不同设计要求的WinCE操作系统。完整的WinCE操作系统包括以下内容:Bootloader、CPU初始化代码、驱动程序(键盘、鼠标、声卡、显卡、IDE、COM、USB)、用户界面接口、完成特定功能的应用程序。
底板采用的是主控芯片是LPC935,是一类自身并不能带有在片CAN的微控制器。但是它带有SPI接口,设计中就是用SPI接口加***的CAN控制器(MCP2515)来实现CAN的功能。MCP2515作为CAN控制器,是一种***的控制器,主要用于一般工业环境中的局域网络控制,完全支持CAN总线V2.0A/B技术规范。CAN收发器采用了TJA1050T,可以同时操作多个CAN网络,提供高达1Mb/s的传输速率。同时采用光电隔离提高系统的稳定性。用以实现底板与嵌入式WinCE设备的通信
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