文档介绍：摘要
随着计算机技术微电子技术和信息处理技术的发展各类嵌入式应用系统越来越
复杂功能越来越强大系统与系统系统与计算机之间的联系越来越紧密以前的系
统间通信一般采用串行接口方式串行接口成本低廉电路简单但通信速度慢不能
满足大量数据实时传输的需要本课题的目标就是构建一个嵌入式系统与计算机的高速
通信接口来进行高速数据传输
通过对比 USB 与 IEEE1394 的优缺点本课题选择了 协议作为嵌入式应用
系统与计算机的通信接口方案 USB 是上个世纪末推出的一种总线标准具有接口容
易传输速度快支持热插拔等特点广泛应用在外设与计算机的接口中 采
用差分信号来进行数据传输只需两根数据线传输速度可达最大传输距离
为米作者通过深入研究 USB 协议的内容和 USB 总线控制器的特性设计出了一种
高效稳定的 接口电路
系统选用 TI 公司新款 DSP 芯片 TMS320F2812 作为嵌入式系统控制器该芯片速
度为 150MIPS 比普通单片机快几十到一百倍并且集成了高速模/数转换等诸多外设
具有极高的性价比以此芯片作为系统主控单元具有广泛的应用前景作者深入研究
了该芯片的特点性能参数及对外围电路的设计要求完成了电路设计及调试工作针
对 DSP 的特性作者设计了高效的 USB 协议实现软件实现了系统与计算机的高速数
据传输实验结果表明该系统工作稳定性能可靠
基于 TMS320F2812 DSP 的 接口电路性能稳定结构简单抗干扰能力强
功耗低具有极高的性价比
关键词 USB 接口 DSP 数据传输
I
ABSTRACT
With the development of puter technology, microelectronic technology and
information technology, many kinds of embedded systems e more and more
complicated; their functions e more and more powerful; munication between
system and system, system puter is ing more and more important. Formerly,
munication between systems usually use munication interface (SCI), which
is cheap and simple. But the speed of SCI is too slow to meet the need of the high-speed data
transmission in real time. So, the aim of my project is to design a high-speed interface
between embedded system puter.
Through balancing the excellences and disadvantages between USB and IEEE1394, we
selected the interface to perform munication between embedded system and
computer. USB is a bus protocol issued in the late of last century. It is applied widely in
interfaces puter puter external devices because of its excellences: easy
to use, high-speed and supporting to cut in or pull out on-line. interface use two lines
to transmit data within five meters, and the fasted speed can reach to 480Mbps. We have
designed out an efficient, steady interface circuit by studying the USB protocol
deeply.
We have used the DSP chip of TMS320F2812