【作者】 张俊；

【导师】 吴裕斌；

【作者基本信息】 华中科技大学 ， 物理电子学， 2004， 硕士

【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USB2.0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。USB2.0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480Mbps,最大传输距离为5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USB2.0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USB2.0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。更多还原

【Abstract】 With the development of the computer technology, microelectronic technology and information technology, many kinds of embedded systems become more and more complicated; their functions become more and more powerful; the communication between system and system, system and computer is becoming more and more important. Formerly, the communication between systems usually use serial communication 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 and computer.Through balancing the excellences and disadvantages between USB and IEEE1394, we selected the USB2.0 interface to perform the communication between embedded system and computer. USB is a bus protocol issued in the late of last century. It is applied widely in interfaces between computer and computer external devices because of its excellences: easy to use, high-speed and supporting to cut in or pull out on-line. USB2.0 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 USB2.0 interface circuit by studying the USB protocol deeply.We have used the DSP chip of TMS320F2812 as the controller of build-in system. This chip is a new product reseased by TI. Its speed of instruction performance is 150MIPS, which is nearly one hundred times of other MCU’s. TMS320F2812 has been built in high-speed A/D conversion cell and other external devices; it will be used in many fields. We have studied the characteristics, capabilities, parameters and external circuit demands of this chip deeply; have completed circuit design and debugging. Aiming at the characteristics of the DSP, we have designed efficient software to perform USB protocol, achieved to the high-speed data transmission between system and computer. The result of experiments indicated that our system works steady and performs well.The interface of USB2.0 between TMS320F2812 DSP and computer has good performance, simple structure, low power consumer, and low cost.更多还原