单片机控制的LED点阵显示系统--毕业论文设计

单片机控制的LED点阵显示系统

河北经贸大学毕业论文

单片机控制的LED点阵显示系统

——基于主控电路设计部分

专业名称： 电子信息工程

班 级： 2004级1班

学生姓名： 刘树强

指导教师： 周彦良

完成时间： 2008年5月

单片机控制的LED点阵显示系统

摘要

本文介绍了一种应用于室内的大型LED显示系统的设计和研制。该系统采用高性能32位ARM微处理器为主控芯片，并由其实现LED显示屏刷新及动态显示效果的控制。系统通过RS-232串口和主控芯片进行数据通信，LED显示屏的行、列驱动信号分别由ARM处理器的GPIO口输出。工作原理是：系统与上位机的通信由LPC2148的UART0口与RS232接口电路完成，上位机仅需将要显示的数据发送到ARM芯片，再由芯片来输出所要显示的字模数据。显示屏采用1/16动态逐次行扫描方式，先将GPIO口中的字节数据依此串行移入对应的16组74HC573列驱动电路并锁存。随后启动行驱动电路的选通信号，完成一行的LED显示。依次类推，逐次的显示LED屏的各行，完成一帧的显示。系统具有硬件结构简单、LED显示刷新速度快、系统可靠、成本适宜等特点。方案经实际测试验证，证明设计是成功的。

关键词 ：LED ；ARM ；微处理器 ；GPIO。

单片机控制的LED点阵显示系统

Abstract

A large-scale application of the indoor LED Display System Design and Development is introduced in this article. The high-performance 32-bit ARM microprocessor chip to control is used in this system, and the realization of LED display refresh and dynamic effect of control. System communicates with microprocessor chip through the RS-232 serial port for data communications. Driver signals of LED display row and column are supplied by the ARM processor’s GPIO(General Purpose I/O Port). The working principle is: PC system and the communication from the UART0 of LPC2148 and RS232 interface circuit completed, Pc need to sent the date that will display to the ARM chip, and then from the chip to output data to show Zimo. Display is completed by 1 / 16 dynamic successive line scanner, the bytes of data from GPIO port so serially import into the corresponding 16 Group 74 HC573 out drive circuit and latches. Then the signal that can enable the each row date of LED to display is started, in this way, the work of displaying one row is completed. By the same way, successive LED display screen of the trip, the completion of a frame show. Hardware of system is characterized of simple structure, LED display refresh faster, the system reliable, cost-appropriate, and some others. Through the practical application of the test, the proof is that the design is successful.

Keywords: LED; ARM ; Microprocessor ; GPIO.

单片机控制的LED点阵显示系统

目录

1 绪论 ................................................................................................................................. 1

2 背景知识......................................................................................................................... 3

2.1 LED的结构及发光原理 ........................................................................................ 3

2.2 单色光LED的种类及其发展历史 ...................................................................... 3

3 设计任务及意义 ............................................................................................................ 4

3.1 设计任务 .................................................................................................................. 4

3.2 设计意义 .................................................................................................................. 4

4 设计方案及实现 ............................................................................................................ 6

4.1 设计方案的比较 ...................................................................................................... 6

4.1.1 基于STC89S52单片机的实现方案 ............................................................. 6

4.1.2 基于ARM7芯片的实现方案 ....................................................................... 6

4.2 系统分析 .................................................................................................................. 6

4.2.1 对显示模块的控制及连接 ............................................................................. 6

4.2.2 系统中的关键技术 .......................................................................................... 7

4.2.3 ARM微处理器的选型 ................................................................................... 7

4.3 系统的硬件设计 ...................................................................................................... 7

4.3.1 系统整体设计方案 .......................................................................................... 8

4.3.2 电源电路设计 .................................................................................................. 8

4.3.3 时钟电路设计 .................................................................................................. 8

4.3.4 复位电路设计 .................................................................................................. 9

4.3.5 串口通信电路设计 .......................................................................................... 9

4.3.6 显示模块电路设计 ........................................................................................ 10

4.3.7 逐行扫描显示控制电路设计 ....................................................................... 11

4.3.8 显示数据锁存控制电路设计 ....................................................................... 12

4.3.9 显示模块的驱动电路设计 ........................................................................... 12

4.3.10 显示数据缓存电路设计 ............................................................................. 13

4.3.11 显示模块级联电路设计 ............................................ …… 此处隐藏：10937字，全部文档内容请下载后查看。喜欢就下载吧 ……