文档介绍：上海交通大学
硕士学位论文
嵌入式系统在LED大屏幕异步控制器中的应用
姓名:王有乾
申请学位级别:硕士
专业:电力电子与电力传动
指导教师:佘焱
20070101
摘要
摘要
LED 显示屏是八十年代后期在全球迅速发展起来的新型信息显示
媒体,它利用发光二极管构成的点阵模块或像素单元组成的平面式显
示屏幕,以可靠性高、使用寿命长、环境适应能力强、价格性能比高、
使用成本低等特点,在短短的十来年中,迅速成长为平板显示的主流
产品,并越来越广泛地应用到工业、交通、金融及信息广告等各行业。
以住的 LED 异步控制器只能把一个屏幕作为一个完整的区域进行
显示,或者简单的把屏幕分成几个固定的区域,这样对于用户来说往
往缺乏足够的灵活性。所以屏幕较大时,用户往往只能使用价格比较
贵的同步控制器。但是同步控制器也有很大的局限性,比如一台 PC 只
能控制一个控制器。
针对以上情况,本文提出了一款基于 32 位高性能 ARM 处理器和
uC/OS-II 的 LED 大屏幕异步控制器的设计方案。它充分利用了 uC/OS-
II 高效的多任务管理功能和 ARM 处理器强大的运算能力,实现了单屏
幕多窗口的任意位置显示,使得屏幕显示内容变得更加丰富,显示方
式变得更加灵活。从而使得异步控制器同步化。
关键词:LED 大屏幕,异步控制器,多窗口显示,ARM 处理器
I
ABSTRACT
Abstract
LED screen technology is a new information display technology which
is developed rapidly since late 1980s. It is made of lattice module to make
up big area display system. And for its many features such as high reliability,
long age, high performance, low cost, and much higher acclimatization, it
has always been the mainstream product in the industry. It has been used in
the field of information shows and advertisement at public places such as
financial market, station, highway, financial market and so on.
In the past, LED asynchronous controller only divided the screen into
single area or several fixed areas. It is short of flexibility for the clients, so
the clients must use the synchronous controller which is more expensive if
the screen is large. But the synchronous controller also has its limitations.
For example, one PC can just control one screen.
Based on the conditions above, a new design based on 32bit ARM and
uC/OS-II is provided in this paper in which the multi-tasks management
function of uC/OS-II and the powerful arithmetic capability of ARM
processor are applied. This new controller can realize multi-windows and
free position display, which can make the screen display more flexible.
KEY WORDS: LED large screen, asynchronous controller, multi-windows
display, ARM MCU
II
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