基于单片机和USB接口的数据采集系统设计XX大学毕业设计（论文）PAGEVIPAGEVII毕业设计论文基于单片机和USB接口的数据采集系统设计摘要通用串行总线USB(UniversalSerialBus)是一种新型的微机总线接口规范。随着客户对系统数据采集速度要求的不断提高，USB以其使用方便、易于扩展、速度快等优点而越来越多的应用于数据采集系统中。本文介绍了一种基于USB总线的数据采集系统的设计方法，采用PHILIPS公司的USB接口芯片PDIUSBD12与单片机AT89C51进行通信，并和PC机通信。该系统用传统的USB总线取代了RS232串行总线，通过对USB协议和设备构架的充分理解，对以单片机89C51和USB接口芯片PDIUSBD12为主的数据采集系统进行了硬件设计和软件编程，并在此设计的基础上给出相应的原理图。硬件设计主要解决的是PDIUSBD12和ADC0809与单片机之间的接口电路问题，软件编程大致分为三部分:一是为满足D12在USB上的最大传输速率而编写的固件程序;二是在PC机中的Windows2000工作环境下编写USB设备驱动程序；三是充分了解D12的主要功能特点，并编写出应用程序。通过该数据采集系统，我们可以对USB协议有很深刻的理解，对D12接口芯片有很熟练的应用，能更好领悟USB接口的优势。关键词：单片机；USB；数据采集；固件DesignofDataAcquisitionSystemBasedonSingleChipComputerandUSBInterfaceAbstractUniversalSerialBusisanewspecificationformicrocomputerbusinterface.Withthecontinuingadvanceoftheclients'demandforthespeedofadatacollectionsystem,USBismoreandmorewidelyusedindatacollectionsystemforitsadvantagessuchasconvenience,expandingportwitheaseandhighspeedetc.ThispaperpresentsaUSB-baseddataacquisitionsystemdesignmethods,PHILIPScompaniesusingtheUSBinterfacechipwithPDIUSBD12ProgressiveAT89C51OKcommunication,andcommunicationandPC.ThesystemusingtraditionalUSBreplacetheRS232serialbus,ThroughtheUSBframeworkagreementandequipmentwiththefullunderstanding,rightto89C51microcontrollerandUSBinterfacechipPDIUSBD12-baseddataacquisitionsystemforthehardwarepiecesofsoftwaredesignandprogramming,andinthisdesignisgivenonthebasisofthecorrespondingdiagram.ThemainsolutionofHardwaredesignistheConnectionbetweenPDIUSBD12andADC0809withtheinterfacebetweenthemicrocontrollercircuit,Thesoftwareprogrammemainlyincludes:thefirewarecodeinneedofD12'smaximumtransmissionrate;USBdevicedriverandclientapplicationunderthecircustanceofWin2000operationsystemincomputer.Afterthisdatacollectionsystem,wecanunderstandtheUSBprotocolprofoundlyandapplytheinterfacechip-PDIUSBDI2proficiently.Inall,theadvantagesofthisinterfacetechniquemayhelpstoyourdesignarrangement.Keywords:MCU;USB;datacollection;firmware