基于ARM微处理器的LED显示屏控制器的研究与开发

发布时间：2018-11-05 14:25

【摘要】： 近年来,LED(light emitting diode,发光二极管)电子显示屏作为一种高科技产品日益引起人们的重视。它可以实时显示或循环播放文字、图形和图像信息,具有显示方式丰富、观赏性强、显示内容修改方便、亮度高、显示稳定且寿命长等多种优点,被广泛应用于商业广告、体育比赛、交通信息报导等诸多领域。 LED显示屏的核心技术主要集中在控制器中。目前,大部分异步显示屏采用的是8位或16位的微控制器,由于受到微处理器的处理速度、体系架构、寻址范围、外围接口资源等诸多限制,已难以在要求显示较多像素、显示内容帧频较高、动态显示效果复杂的情况下得到良好的动态视觉效果。针对以上情况,本文研究开发了一种全新的,由32位高性能ARM微处理器组成的LED显示屏控制系统,就控制平台、硬件结构和软件开发实现给出了驱动部分和控制部分的详细分析与设计。本文根据LED显示屏在列车车厢和火车、汽车车站旅客导向系统中为应用背景,结合LPC2138的功能特点和LED显示屏的功能需求。详细介绍了显示屏控制系统中包括电源模块、复位模块、RS485通讯电路等主要模块的设计。成功实现了数据扫描、数据发送、数据通讯等LED显示屏所需的功能。结合控制系统RS485通讯协议和系统显示的要求,分析了LED显示屏通讯和控制系统的软件开发流程。并详细分析了显示屏的静、动态图文显示软件流程结构;系统从上位机接受数据到信息显示的整个软件处理流程。最后本文分析了LED显示屏控制系统研发中所遇到的几个难点问题,包括:提高RS485总线可靠性和抗干扰问题、系统在频繁更换内容死机的问题、显示内容较多时视觉效果的处理问题,并给出了解决方法。经过实际测试,本文所述LED显示屏控制系统性能良好,工作稳定可靠,易于维护升级,具有很高的性价比。
[Abstract]:In recent years, LED (light emitting diode, LED) electronic display screen as a high-tech product has attracted increasing attention. It can display or recycle text, graphics and image information in real time. It has many advantages, such as rich display mode, strong appreciation, convenient modification of display content, high brightness, stable display and long life span. It is widely used in commercial advertisements. Sports competitions, traffic information reports and many other fields. The core technology of LED display screen is mainly concentrated in the controller. At present, most asynchronous display screens use 8-bit or 16-bit microcontrollers. Due to the limitations of microprocessor processing speed, architecture, addressing range, peripheral interface resources and so on, it is difficult to display more pixels. Better dynamic visual effect can be obtained when the frame frequency of display content is high and the dynamic display effect is complex. In view of the above situation, this paper studies and develops a new LED display screen control system, which is composed of 32-bit high-performance ARM microprocessor. The hardware structure and software development are analyzed and designed in detail. According to the application background of LED display screen in passenger guidance system of train carriage, train and automobile station, this paper combines the function characteristics of LPC2138 and the functional requirement of LED display screen. The design of the display screen control system including power supply module, reset module, RS485 communication circuit and so on is introduced in detail. Data scan, data transmission, data communication and other functions of LED display screen are successfully realized. Combined with the communication protocol of RS485 control system and the requirement of system display, the software development flow of communication and control system of LED display screen is analyzed. The software flow structure of static and dynamic graphic and text display of the display screen is analyzed in detail, and the whole software processing flow from receiving data to displaying information on the upper computer is also analyzed. Finally, this paper analyzes several difficult problems encountered in the research and development of LED display screen control system, including: improving the reliability of RS485 bus and anti-interference problems, frequently changing the contents of the system to crash. The processing problem of visual effect when more content is displayed, and the solution is given. Through the actual test, the LED display control system in this paper has good performance, stable and reliable work, easy to maintain and upgrade, and has a very high performance-price ratio.
【学位授予单位】：江南大学
【学位级别】：硕士
【学位授予年份】：2007
【分类号】：TN873;TP273

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