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摘要嵌入式系统主要由嵌入式处理器、相关支撑硬件和嵌入式软件系统组成，它是集软硬件于一体的可独立工作的“器件”。嵌入式处理器主要由一个单片机或微控制器(MCU)组成。相关支撑硬件包括显示卡、存储介质（ROM和RAM等）、通讯设备、IC卡或信用卡的读取设备等。嵌入式系统有别于一般的计算机处理系统，它不具备像硬盘那样大容量的存储介质，而大多使用闪存（Flash Memory）作为存储介质。嵌入式软件包括与硬件相关的底层软件、操作系统、图形界面、通讯协议、数据库系统、标准化浏览器和应用软件等[1]。32612
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本文从各个方面分析介绍了LED的驱动方式,设计了对LED显示屏进行显示控制的方案。系统分为硬件和软件两个部分。硬件部分是以SEP3203芯片为核心，通过SPI口输出显示数据，以74HC595芯片为驱动，实现了对数码管的数据写入、动态扫描、驱动显示等功能。
本设计的软件采用C语言和汇编语言进行编程，通过汇编语言实现核心板底层的驱动设计，LED的显示驱动部分在ADS环境下采用C语言，利用模块化结构完成程序的设计，并在AXD调试环境下完成软件的调试。[8]
关键词: 嵌入式、74HC595、SEP3203、ARM7微处理器
毕业论文设计说明书外文摘要
Title 基于嵌入式系统的LED显示控制接口设计
Abstract
Embedded system consists of embedded processors, related support hardware and embedded software system, which is set in one of the available hardware and software work independently "devices." It consists of a single-chip embedded processor or microcontroller (MCU) components. Related support hardware, including graphics cards, storage media (ROM and RAM, etc.), communications equipment, IC card or credit card reading equipment. Embedded system is different from the general computer processing system, it does not have as large-capacity hard disk as a storage medium, and most of the use of flash memory (Flash Memory) as the storage medium. Embedded software includes the underlying software and hardware related, operating systems, graphical interfaces, communication protocols, database systems, standardization of browser and application software.
This paper describes the analysis of all aspects of LED drive mode, the program is designed LED display control system. Hardware and software system is pided into two parts. The hardware part is 74HC595 chip-driven, design data writing, dynamic scanning, display and other peripheral drive circuit, a display information quickly written in embedded systems and read.
Software using C and assembly language programming, to achieve the underlying drive and function in assembly language. The modular design of the upper display extended program structure and open architecture based on the C language, making fast text input and editing environment and a variety of display control can be successful.
The paper is mainly used in the shift register 74HC595 as a driving part connected SEP3203 chip through the SPI port, realize LED control interface designed on the basis of embedded systems.
Keywords Embedded, 74HC595, SEP3203, ARM microprocessor
目 次
1 绪论1
1.1 电子显示屏的应用和历史1
1.2 电子显示屏的特点2
2 系统组成 4
2.1 74HC595驱动芯片的介绍4
2.2 七段译码LED模块 5
2.3 SEP3203 SPI口的配置和读写方法：7
3 系统硬件设计 9
3.1七段LED数码管结构及字形码 9
3.2七段LED数码管与74HC595芯片的连接 10
3.3 系统原理图11
3.4 LED驱动电路设计 12
3.5 LED 设计中GPIO 模块的使用12