摘 要

随着多媒体信息查询设备的与日俱增以及智能化时代的到来，智能手机，平板，电脑等电子产品的普及程度越来越广泛可以说遍布全球，人们越来越多地谈到触摸屏，触摸屏不仅坚固耐用、而且反应速度快、占用空间少、易于交流等。利用这种技术，用户只要用手指轻轻地碰计算机显示屏上的图符或文字就能实现对主机操作，从而使人机交互更为直截了当，这种技术大大方便了那些不懂电脑操作的用户。

本文以触摸屏为研究对象，实现触摸屏与DSP之间的通信，从而完成友好的人机交互。本文主要研究内容如下：

首先分析、了解触摸屏的原理特性及其国内外的发展历史、现状及趋势。然后对触摸屏技术进行了简单的介绍，并对触摸屏的种类、接口加以区别并进行分析比较，选出适合本设计需要的触摸屏。

根据功能需求，由测试控制器PC向该DC/DC发出指令以达到控制燃料电池输出功率的目的，从而对燃料电池的性能进行测试。燃料电池变换器DC/DC以TI公司的TMS320F28335处理器为主控芯片，然后设计了DC/DC测试的整体系统方案，并分析了测试系统的DC/DC拓扑结构。

对触摸屏与DC/DC之间的CAN通信进行详细的描述，制定了完善的CAN通信协议，并完成了对测试系统的界面设计，根据功能设计和界面设计内容，完成相关的代码开发编写工作，实现上位机与DSP的通信。

最后通过实验测试平台对系统的工作模式和各种功能进行了测试分析，测试触摸屏与DSP的通信是否正常，是否能满足研究项目的要求，并进行改善。

关键词：触摸屏，CAN通信，交错并联，升降压调节

Abstract

With the development of multimedia information query equipment and the arrival of the era of intelligent grow with each passing day, the intelligent mobile phone, tablet computer and other electronic products, the popularity of more and more can be said that throughout the world, more and more people talking about the touch screen, the touch screen is not only durable, and fast reaction speed, less occupied space, easy to exchange etc.. With this technology, users can use the fingers gently touch on the computer screen icons or text can be achieved on the host, so as to make the human-computer interaction more straightforward, this technique is more convenient for users who do not understand computer operation.

This paper takes touch screen as the object of study to realize the communication between touch screen and DSP, so as to achieve friendly human-computer interaction. The main contents of this paper are as follows:

First of all, analyze and understand the principle and characteristics of touch screen and its development history, current situation and trend at home and abroad. Then, touch screen technology is briefly introduced, and the types and interfaces of the touch screen are distinguished and analyzed and compared, and a touch screen suitable for the design is selected.

According to the functional requirements, an instruction is sent to the DC/DC by the test controller PC to achieve the purpose of controlling the output power of the fuel cell, thereby testing the performance of the fuel cell. The fuel cell converter DC/DC takes the TMS320F28335 processor of TI Corporation as the main control chip, and then designs the overall system scheme of the fuel cell test, and analyzes the DC/DC topology structure of the test system.

A detailed description of the CAN communication between touch screen and DC/DC, CAN developed a perfect communication protocol, and completed the interface design of the fuel cell test system, according to the functional design and interface design, code development related preparation, communication between PC and DSP.

Finally, the working model and functions of the system are tested and analyzed through the experimental platform. The communication between the touch screen and the DSP is normal, whether it can meet the requirements of the research project and improve it.

Keywords: touch screen, CAN communication, interleaved parallel, ups and down pressure regulation.

目 录

摘要 I

Abstract II

第1章 绪论 1

1.1 课文研究的背景及意义 1

1.2 触摸屏行业发展现状 1

1.3本文的主要研究内容 2

1.4 本章小结 2

第2章 触摸屏的简介及其分类 3

2.1 触摸屏的特性 3

2.2 触摸屏的主要类型 3

2.3 触摸屏的选型 4

2.4 本章小结 5

第3章DC/DC测试系统方案设计 6

3.1 DC/DC测试系统整体方案设计 6

3.2测试系统的DC/DC拓扑分析 7

3.2.1典型的DC/DC变换电路 7

3.2.2主电路的DC/DC拓扑分析 10

3.3 本章小结 13

第4章 通信协议制定与界面设计 15

4.1 通信协议的制定 15

4.1.1通信方式的选择 15

4.1.2 通信协议的制定 17

4.2 触摸屏界面设计 20

4.3 本章小结 22

第5章 CAN通信编程实现 24

5.1 CAN通信的实现 24

5.1.1 DSP28335eCAN模块配置 24

5.1.2 DSP28335eCAN程序代码编写 26

5.2 实验测试分析 27

5.3 本章小结 29

第6章 总结与展望 30

6.1 总结 30

6.2 展望 30

参考文献 31

致谢 33

绪论

1.1 课文研究的背景及意义

随着科技的普及，20世纪90年代初，出现了一种新的人机交互技术-触摸屏技术。触摸屏，是一种感应式液晶显示装置，当点击触摸屏上的各种功能控件时，就能实现相应的功能，与键盘和鼠标操作相比更加的简洁，明了。因此，触摸屏技术已越来越受到欢迎，技术也越来越成熟。

利用触摸屏技术，可以非常方便的实现人机交互，与各种设备通信，而且画面相当的直观，通俗易懂。本文利用触摸屏的各种优点从而实现与DSP之间的通信，完成对DSP的各种监测，包括输入输出电流、电压的检测等。