[优秀毕业设计精品]自动讲解系统的设计

A1A0A2A3A4A5A61主控芯片发射模块配置模块第1章绪论11课题探究的背景及目的近年来，随着中国经济的迅速发展，人们生活水平不断提高，同时对文化、知识的渴求也与日俱增。展览馆、科技馆和博物馆等，成为广大人民群众的新宠。然而传统的人工讲解由于其效率低、效果差，已经不能适应人们日益增长的需求。智能化自动讲解已经开始逐步代替人工讲解，成为了展览讲解的主力。可是现在的自动讲解系统往往结构复杂，价格昂贵，音质差、延展性差，人们对简易的自动讲解模块的需求越来越高。本课题旨在开发一款结构简单、音质好、延展性好的简易自动讲解系统。根据课题的设计G16213求，开发了G1867G7389MP3、WMA音G20069文G1226解G11733、G2464G3780G17959G12447G1319G3780G6785G6930、G7092G13459识G2047、FAT32文G1226系统G1660G4396和G9094G7242G7186G12046G2163能的自动讲解系统。G16825系统G2265G6336G3247G1022模块G726音G20069解G11733与G6785G6930模块，G18331G11004G14464G1860VLSIG1856G2508G1998G2709的VS1003音G20069解G11733G14467G10267，音质好G727G7092G13459识G2047模块，G18331G11004G7376G5455G7043G10317G13546G11733解G11733传G17767G6980据，CRC16G7669G20576，G6980据可G19764G727G1660G4396模块，G18331G11004G17902G11004大G4493G18339SDG2357，G18209G2524FAT32文G1226系统G1363延展性G7368好G727G9094G7242G7186G12046模块。本系统可G1209广G8879G3332应G11004在展览馆、科技馆和博物馆等的G12447G1319G3780自动讲解、G7065G9228G7235G9869的自动G6785G6265，G1209G9397G17287G4466G19481的G1363G11004G16213求。同时G16825系统G1867G7389G14403好的可G6205展性与G17902G11004性。12目前主流的自动讲解系统G11458G2081主G8981的自动讲解系统G2010为G1016G18108G2010G726发G4568G18108G2010和G6521G6922G18108G2010发G4568G18108G2010G11004于发G4568G12879G1296于设G3803G13546G2507的G13546G11733G1461G5699，G7706G3282G3926G991G726A811A9A7A10A11A12A13A14A15A16A17A18A12A19A20A21A22A23A24A25A26A27A28A292G6521G6922G18108G2010G11004于G6521G6922发G4568G16025G13634G6164发G4568的G1461G5699，然G2530G17839G15904识G2047，G1582G1998G11468G3252的G2465应G708G6785G6930音G20069等G709，G7706G3282G3926G991G726A812A9A7A10A11A12A13A14A15A16A17A18A12A30A31A21A22G2520模块G7053G7708G3926G991G7261、G7092G13459发G4568/G6521G6922模块G726G18331G11004G13430G3818模块G6122G11017G4388G7643G126262、音G20069模块G6785G6930G726G18331G11004G999G11004的音G20069模块3、G6980据G1660G4396模块G726G18331G11004EEPROMG6122FLASHG708G7389时G1660G4396模块G19610成在G16833音G14467G10267G1881G18108G709工G1328G2419G10714G726发G4568G16025G13634G1820G3818G11040G17764G4568G7092G13459G1461G2507，G6521G6922G16025G13634G6521G6922G2052G7389效G1461G2507时，G1186G6980据G4396G1660模块中G2474G1998音G20069G6980据，G17877入音G20069模块中G6785G6930，同时G9094G7242G7186G12046G11468应G1461G5699。13预期效果本系统可G1209G7389G1016种G1363G11004G7053法，G2010G2047为G6521G6922G16025G13634固定和发G4568G16025G13634固定。在G7092人G19764近时，G6521G6922模块的G9094G7242只G7186G12046展G2709名称。当参观者G19764近展台时，G6521G6922模块G6521G6922G2052IDG1461G2507G1461G2507，并在G9094G7242屏幕上将G7186G12046当G2081展G2709的G11468关详细G1461G5699，同时G6521G6922模块将次IDG2507对应的音G20069文G1226G6785G6930G17839G15904讲解。当讲解结束时，G2163G6930模块自动关闭，G1186而G4466现G1867G7389G6521近G2163能的自动讲解。G1867G1319G2163能为G726A32A33A34A35A36A37A38A39A40A41A42A43A44A45A46A47A48A49A50A51A46A47A52A53A54A55A46A47A56A57A58A59A60A61A6231、发G4568转G13634可G1209发G4568IDG1461G2507，并且IDG2507可G1209G17902过串口写入，掉G11017不丢失。2、G6521G6922G16025G13634能感知发G4568G16025G13634发G4568过来的G1461G2507，并且能G1582G1998G11468应的G2465应，G3926G6785G6930音G20069，G7186G12046G1461G5699等。3、G6521G6922G16025G13634G1867G7389音G18339调节G2163能。4、G6521G6922G16025G13634G1867G7389音G20069的暂停与重G6930G2163能。5、G6521G6922G16025G13634G1867G7389G9094G7242G7186G12046G2163能。14本课题对目前自动讲解系统的改进1、G11458G2081主G8981自动讲解系统的缺G9869G726AG7092G13459发G4568/G6521G6922模块G726G18331G11004G13430G3818模块只能识G2047人是否G6521近，G7092法识G2047人的身份G727G18331G11004G11017G4388G7643G12626可G1209识G2047人的身份，但G1328G11004距离较短。BG11458G2081的G999G11004的音G20069模块音G20069G18331样率较低，音质不佳G727音G20069录入困难，不能G17839G15904G2530期制G1328。CG709G18331G11004EEPROMG6122FLASHG1328为G1660G4396模块只能利G11004G10317殊的设G3803向其写入G6980据，不便于G6980据的传G17767和管G10714，G7092法G7368换。2、此次课题对G11458G2081主G8981自动讲解系统的改G17839G726AG709G18331G11004G7092G13459G6922发模块来发G17877与识G2047G13546G11733G1461G5699，距离远、可识G2047人的身份。BG709G18331G11004MP3、WMA音G20069文G1226解G11733器G1328为音G20069G6785G6930模块，音质好，音G20069便于制G1328，可利G11004现G7389软G1226对音G20069G17839G15904加工和G2530期制G1328。CG709G18331G11004大G4493G18339SDG2357G1328为G1660G4396模块，G4493G18339大，G7368换简单G727G18209G2524FAT32文G1226系统，可直G6521G17902过G11017脑像U盘一样读写G6980据。15论文结构安排本文G1209系统开发过程为总G13459，G1820对G11458G2081主G8981的自动讲解系统G17839G15904结构G2010析，指G1998G6164G4396在的弊病，随G2530引G1998本课题，提G1998改G17839G7053G7708和改G17839G7053G7708的优越性。在G6521G991来的G3247章中，我们G1820提G1998系统的总G1319设计G7053G7708，然G2530介绍主G16213的A63A64A65A66A67A68A694三G1022硬G1226G2163能模块，并对每一G1022硬G1226结构我们都G16213G17839G15904深入G3332G2010析。最G2530，给G1998对系统G17839G15904联调、测试G1209及G2010析，给G1998结论。G1867G1319章节安排G3926G991G726第2章是系统的总G1319设计。首G1820给G1998了系统的总G1319设计、G2520模块的G2163能G1209及总G1319G11017路G3282。第3章是单G10267机最小系统。首G1820介绍主G16213控制G14467G10267ATMEGA16，然G2530把ATMEGA16、LCD12864和AD键盘G1328为一G1022单G10267机最小系统，G2010块逐一讲解。第4章是G7376G5455G7043G10317G13546解G11733G1209及CRC16G7669G20576的G4466现，在本章节将阐述G7376G5455G7043G10317G11733G1209及CRC16G7669G20576G11468关知识，提G1998了几G1022G7376G5455G7043G10317G13546解G11733G1209及CRC16G7669G20576的G7053G7708，最G2530根据本系统的G4466G19481情况选G1998最佳组G2524。第5章是G16833音G6785G6265与G1660G4396模块。首G1820介绍主G16213控制G14467G10267VS1003、SDG2357的基本资料，然G2530给G1998了它们与ATMEGA16的G6521口G7053式G1209及驱动程序，最G2530研究了FAT32文G1226系统的结构，并简单阐述了其G2163能的G4466现。第6章是系统的调试、测试G1209及G2010析。首G1820给G1998了系统的软G1226G7053G7706G3282，然G2530给G1998了系统调试过程中G6164遇G2052的问题和解决G7053法，最G2530总结的系统并给G1998了系统的不G17287之处和G1474改G5859G16277。A63A64A65A66A67A68A695第2章单片机最小系统单G10267机最小系统是G1457G19568单G10267机能G17828G15904的最基本的组G1226。G2265G6336G11017G9316、G7242G6403G11017路、复G1313G11017路等。本G20045G11458的最小系统G17836G2265G6336G6365键G11017路、调试G1235G11507G11017路和LCD12864G7186G12046G11017路。21ATMEGA16简介及其开发环境211AVR单片机ATMEGA16简介ATMEGA16是基于增G5390的AVRRISC结构的低G2163G138038G1313CMOSG5506控制器。由于其G1820G17839的指G1208G19610G1209及单时G19059G2620期指G1208G6203G15904时G19400，ATMEGA16的G6980据G2546G2532率高G178101MIPS/MHZ，G1186而可G1209G13543G1955系统在G2163G13803和处G10714速G5242之G19400的G11695G11474。AVRG1881G7692G1867G7389G1028G4512的指G1208G19610和32G1022G17902G11004工G1328G4504G4396器。G6164G7389的G4504G4396器都直G6521与G12651G17935G17765单G1815ALUG11468G17842G6521，G1363G5483一G7477指G1208可G1209在一G1022时G19059G2620期G1881同时G16787问G1016G1022G10432G12447的G4504G4396器。G17837种结构大大提高了代G11733效率，并且G1867G7389G8616G7234G17902的CISCG5506控制器最高G1427910G1505的G6980据G2546G2532率。ATMEGA16G7389G3926G991G10317G986916KG4395节的系统G1881可G13546程FLASHG1867G7389同时读写的能力，G2375RWW，512G4395节EEPROM，1KG4395节SRAM，32G1022G17902G11004I/O口G13459，32G1022G17902G11004工G1328G4504G4396器，G11004于G17805G11040G6207G6563的JTAGG6521口，G6915G6357G10267G1881调试与G13546程，三G1022G1867G7389G8616较模式的G9801活的定时器/计G6980器T/C,G10267G1881/G3818中断，可G13546程串G15904USART，G7389G17227始G7477G1226G7828测器的G17902G11004串G15904G6521口，8路10G1313G1867G7389可选差G2010G17767入G13435可G13546程增益TQFPG4565G16025的ADC，G1867G7389G10267G1881G6403G14645器的可G13546程G11487G19388G10411定时器，一G1022SPI串G15904G12483口，G1209及G1857G1022可G1209G17902过软G1226G17839G15904选G6333的G11477G11017模式。工G1328于G12366G19398模式时CPU停G8502工G1328，而USART、G1016G13459G6521口、A/D转换器、SRAM、T/C、SPIG12483口G1209及中断系统G13499G13505工G1328G727掉G11017模式时G7242G1319G6403G14645器停G8502G6403G14645，G6164G7389G2163能G19512了中断和硬G1226复G1313之G3818都停G8502工G1328G727在G11477G11017模式G991，G5334步定时器G13499G13505G17828G15904，G1813G16780G11004G6155G1457G6357一G1022时G19400基G1946，而其G1325G2163能模块处于G1253G11508G10378G5589G727ADCG3134G3780G6245制模式时G13468G8502CPU和G19512了G5334步定时器与ADCG1209G3818G6164G7389I/OA70A71A72A73A74A75A766模块的工G1328，G1209G19489低ADC转换时的开关G3134G3780G727STANDBY模式G991只G7389G7242G1319G6122G16868G6403G6403G14645器G17828G15904，其G1325G2163能模块处于G1253G11508G10378G5589，G1363G5483器G1226只G9052G13803G7509G4581的G11017G8981，同时G1867G7389G5567速G2563动能力G727G6205展STANDBY模式G991G2029G1813G16780G6403G14645器和G5334步定时器G13499G13505工G13283。本G14467G10267是G1209ATMEL高G4506G5242G19762易失性G4396G1660器技G7427生G1147的。G10267G1881ISPFLASHG1813G16780程序G4396G1660器G17902过ISP串G15904G6521口，G6122者G17902G11004G13546程器G17839G15904G13546程，也可G1209G17902过G17828G15904于AVRG1881G7692之中的引G4560程序G17839G15904G13546程。引G4560程序可G1209G1363G11004G1231G5859G6521口将应G11004程序G991G17745G2052应G11004FLASHG4396G1660G2318APPLICATIONFLASHMEMORY。在G7368新应G11004FLASHG4396G1660G2318时引G4560FLASHG2318BOOTFLASHMEMORY的程序G13499G13505G17828G15904，G4466现了RWWG6817G1328。G17902过将8G1313RISCCPU与系统G1881可G13546程的FLASHG19610成在一G1022G14467G10267G1881，ATMEGA16成为一G1022G2163能G5390大的单G10267机，为G16780G3822G4896入式控制应G11004提G1391了G9801活而低成本的解决G7053G7708。ATMEGA16G1867G7389一G6984G3883的G13546程与系统开发工G1867，G2265G6336G726CG16833G16340G13546G16805器、G4451G8731G13546、程序调试器/软G1226G1235G11507器、G1235G11507器及G16792G1284G7507。212开发环境AVRSTUDIO的使用AVRSTUDIO是ATMELG1856G2508G1998G2709的G4460G7053的G8731G13546，G991G17745与G1235G11507软G1226。一款G19610成的程序开发G10627G3671，可G1209在WINDOWS9X/ME/NT/2000/XPG10627G3671中调试AVR的应G11004G1147G2709。对于AVR的8G1313RISCG5506控制器系G2027，AVRSTUDIO提G1391了一G1022G20045G11458管G10714工G1867，G9316文G1226G13546G17765器，G14467G10267模G6323器和G11017路G1881G1235G11507器G6521口。此G3818，AVR单G10267机的G6915G6357STK500开发G7507，G1186而可G1209G13546程G6164G7389AVR设G3803和新的JTAGG14467G10267模G6323器。单G13443的AVRSTUDIO是G18331G11004G8731G13546G16833G16340G17839G15904G13546程G6817G1328，由于G8731G13546G16833G16340G8616较复杂可读性不G5390，G3252此需G16213在AVRSTUDIO中G4896入WINAVRCG16833G16340G13546G16805软G1226。WINAVRG4613是WINDOWSG10268的GCCAVR，是一G1022G13546G16805器，它可G1209将C/CG16833G16340G13546G16805成AVR单G10267机的G8731G13546代G11733。G13546程时，本文选G2474G5132G11004的CG16833G16340G17839G15904程序的G13546写，可G6817G1328性G1209及可读性较G5390。本G20045G11458的G13546G16805、G1235G11507G10627G3671为G726WINAVRV2061AVRSTUDIOV416。A70A71A72A73A74A75A767AVRSTUDIO的最新G10268本可G1209G1186G4460G13605WWWATMELCOMG991G17745。WINAVR的最新G10268本可G1209G1186G4460G13605WINAVRSOURCEFORGENETG991G17745。G1209G991过程G3355假定PC机上已经安G16025好WINAVR与AVRSTUDIOG13546G16805G1235G11507G10627G3671。在桌面上G9869击AVRSTUDIOG3282G7643，G2464击打开，G7186G12046G1998打开文G1226菜单，G3926G328231G6164G12046。G9869击“NEWPROJECT”，生成新文G1226，G3926G328232G6164G12046，在左侧一栏中选G6333“AVRGCC”，G13546G17765好文G1226名称，确定G6164G16213G1457G4396的文G1226夹的G1313G13634G2530，G9869击“NEXT”，页面转换G17839G15904器G1226选G6333，G3926G328233G6164G12046。在左G17805栏中选G6333AVRSIMULATOR，然G2530在右G17805的菜单中选G6333ATMEGA16，G9869击“FINISH”，G4613会G1147生G3926G328234G6164G12046的工G1328页面，便可G1209在工G1328G2318G1881G17839G15904G13546写程序了。A7721A78A79A76A80A81A82A70A71A72A73A74A75A768A7722A72A83A84A76A80A7723A85A80A86A87A70A71A72A73A74A75A769A7724A88A89A90A9122LCD12864的使用以及AD键盘的设计222LCD12864的使用LCD的G7186G12046G2419G10714及其发展，由于篇幅G2419G3252不再赘述。LCD12864是一种汉G4395G3282形G9869阵G9094G7242G7186G12046模块，可G7186G12046汉G4395及G3282形。它主G16213G18331G11004动G5589驱动G2419G10714由G15904驱动控制器和G2027驱动器G1016G18108G2010组成了128G202764G15904的全G9869阵G9094G7242G7186G12046，G1881G136348192G1022中文汉G4395G70816X16G9869阵G709128G1022G4395符G7088X16G9869阵G709及64X256G9869阵G7186G12046RAMG708GDRAMG709。此G7186G12046器G18331G11004了COB的软G4565G16025G7053式，G17902过G4560G11017橡胶和压G7706G17842G6521LCD,G1363其寿命长，G17842G6521可G1976433。表21LCD12864管脚定义A92A93A94A92A93A95A96A97A98A99A1001VSSA101A102A103A104A105A1062VDDA101A102A103A104A105A1073V0LEDA108A109A104A110A111A1124RSCSA113A114A103A115A116/A117A118A119A120A121A94A122A123A124A125A126A127A128A129A130A131A132A133A134A135A13610A137A138A129A137A138A139A140A141A142A143A1445R/WSIDA145A124A125A146A147A127A148A128A129A122A123A124A149A150A151A1526ECLKA145A124A125A153A142A128A129A122A123A124A125A154A155A156A1577DB0A149A15008DB1A149A15019DB2A149A150210DB3A149A150311DB4A149A150412DB5A149A150513DB6A149A150614DB7A149A150715PSBA145/A123A124A149A150A127A148HA145A124LA123A12416NCA158A13817/RETA159A160A161A162A163A164A16518NCA158A13819LED_AA166A167A168A169A170LED_5V20LED_KA166A167A168A171A170LED_0V本G20045G11458G18331G11004LCD12864串G15904G6521口，时序G3282G3926G991G726A17225LCD12864A123A124A151A152A156A173A130A131A132A133A134A135A13611LCD的初始化G8981程G3926G991G726A17226LCDA125A174A175A176A177A178A172222AD键盘的设计传统的IO口键盘和矩阵键盘占据IO口资G9316过G3822，由于ATMEGA16G1881G18108G19610成8路10G1313的ADC，G6164G1209G18331G11004AD键盘的G6521法，可G1209节G11477IO口资G9316。G11017路G3282G3926G991G6164G12046G726A17227ADA179A180A181A182A172G7092G6365键G6365G991时，ADCKEYG12483为低G11017平，当G7389键G6365G991时，可G1209根据G6164G18331G5483的G11017压来判断是那G1022G6365键被G6365G991。A183A184A185A1860X30A18712864A188A189A190A191A192A193A185A1860X01A18712864A194A195A196A185A1860X06A197A198A199A200A201A202A203A204A185A1860X0CA183A205A206A207A208A200A209A210A130A131A132A133A134A135A1361223本章小结本章给G1998了本G20045G11458的AVR单G10267机最小系统，是G6984G1022系统的G7692心，G1457证的其他的G2520G1022模块能在它的协调G991正G5132工G1328，G1186而完成系统G2163能。G2010块介绍了G2520G1022主G16213G18108G1226的G2419G10714G1209及G1363G11004，给G6984G1022G20045G11458打G991了基础。A211A212A213A214A215A216A21713ATMEGA16A218A219A220A221A222A223A224A225第3章系统的总体方案设计本章给G1998了系统的总G1319G7053G7708设计，G1186G2520G1022角G5242G2010析了系统的可G15904性G1209及G7053G7708的确定。本系统是对传统自动讲解系统的改G17839和升G13435，G6164G1209总G1319结构与传统的自动讲解系统G12879G1296，只是在G2520G1022模块的G2163能上给与加G5390。31系统框图311发射模块发G4568模块的主G16213G2163能G7389IDG2507的发G17877和G17902过串口来G18209G13634IDG2507并G4396G1660在ATMEGA16G1881G18108EEPROM中，掉G11017不丢失。发G4568模块的G7706G3282G3926G991G726A22631A227A228A229A230A231A232A226312接收模块G6521受模块的主G16213G2163能G7389IDG2507的G6521受和识G2047、SDG2357音G20069G4396G1660。VS1003音G20069解G11733和G6785G6930、G7186G12046G1209及G6365键控。发G4568模块的G7706G3282G3926G991G726A22632A233A234A229A230A231A232A226ATMEGA16A235A236A237A238A239A240SDA241A242A243A239A240A244A245FAT2G6171G2318G3348G19556G15267G6171G2318G6980G1457G11053G6171G2318G6980每FATG6171G2318G6980根G11458录G6171G2318G3348G19556G15267G6171G2318G6980G1457G11053G6171G2318G6980每FATG6171G2318G6980FATG69802G709FATG708FILEALLOCATIONTABLEG709文G1226G18209G13634表一G1022G2010G2318G2010成同等大小的G12763，也G4613是G17842G13505G12366G19400的小块。G12763的大小随着FAT文G1226系统的G12879型G1209及G2010G2318大小而不同，G1868型的G12763大小介于2KBG205232KB之G19400。每G1022文G1226根据它的大小可能占G7389一G1022G6122者G3822G1022G12763G727G17837样，一G1022文G1226G4613由G17837些G17837些G708称为单G19154表G709G12763G19154G6164表G12046。然而，G17837些G19154并不一定一G1022G6521着一G1022在G11925盘上G4396G1660，它们经G5132是在G6984G1022G6980据G2318域零G6967的G1660G4396。文G1226G2010G18209表G708FATG709是G7156G4568G2052G2010G2318每G1022G12763的G7477G11458G2027表。每G1022G7477G11458G16772录G991面G1128种G1461G5699中的一种。G444G19154中G991一G1022G12763的G3332G3348G444一G1022G10317殊的文G1226结束符G708EOFG709符G2507指G12046G19154的结束G444一G1022G10317殊的符G2507G7643G12046G3363G12763G444一G1022G10317殊的符G2507G7643G12046G1457G11053G12763G4440来表G12046G12366G19398G12763FAT32文G1226系统G18331G1100432G1313的文G1226G2010G18209表，每一G1022G12907G19154表的长G5242为4G1022G4395节，含G1053G3926G991G7260X00000000G12366G19398G127630X00000001G1457G11053G127630X000000020X0FFFFFEF被占G11004的G12763G727指向G991一G1022G127630X0FFFFFF00X0FFFFFF6G1457G11053值0X0FFFFFF7G3363G127630X0FFFFFF80X0FFFFFFF文G1226最G2530一G1022G12763G8892G5859FAT32只G1363G1100432G1313中的28G1313。高4G1313G17902G5132是0但它们是G1457G11053G1313，不G16213随G5859G7368改它们。3G709FAT32文G1226系统的根G11458录A68A133A134A135A136A137A13836FAT32的另一G20045重大改G19773是根G11458录的文G1226化，G2375将根G11458录等同于G7234G17902的文G1226。G17837样根G11458录便没G7389了FAT16中512G1022G11458录G20045的G19492制，不够G11004的时G1517增加G12763G19154，G2010G18209G12366G12763G2375可。而且，根G11458录的G1313G13634也不再硬性G3332固定了，可G1209G4396G1660在G2010G2318G1881可G4559G3348的G1231G5859G12763G1881，不过G17902G5132根G11458录是最G7101建G12447的格式化G4613生成了G11458录表。G6164G1209，我们G11487G2052的情况基本上都是根G11458录首G12763占G12763G2318G20046序上的第1G1022G12763。根G11458录G4613是我们读G2474FAT32文G1226系统中G6980据的第一G1022G2011入G9869，是G6984G1022G7653G10378G11458录结构的第一G1022G10627节。4G709FAT32文G1226系统的G11458录结构FAT文G1226系统的G11458录结构其G4466是一G20075G7389向的G1186根G2052G2506的G7653，G17837G18336提G2052的G7389向是指对于FATG2010G2318G1881的G1231一文G1226G2265G6336文G1226夹，G3355需G1186根G11458录G4559G3348来G6226G2052。可G1209G17837样G16760为G726G11458录G4396G1660结构的入口G4613是根G11458录。FAT文G1226系统根据根G11458录来G4559G3348其他文G1226G2265G6336文G1226夹，G6937而根G11458录的G1313G13634G5529G20047在G11925盘G4396G2474G6980据之G2081G5483G1209确定。FAT文G1226系统G4613是根据G2010G2318的G11468关DBR参G6980与DBR中G4396G6930的已经计G12651好的FAT表2份的大小来确定的。格式化G1209G2530，G17331G11458录G1313G13634其G4466都已经确定G991来了G708参G16277G1856式G726根G11458录G6171G2318G3348G19556G15267G6171G2318G6980G1457G11053G6171G2318G6980每FATG6171G2318G6980FATG6980G709。根G11458录之G2530便是G6980据G2318第2G12763。FAT文G1226系统的一G1022重G16213G5617G5831是把G11458录文G1226夹当G1328一G1022G10317殊的文G1226来处G10714，FAT32甚G14279将根G11458录当G1328文G1226处G10714。FATG2010G2318中G6164G7389的文G1226夹G11458录文G1226，G4466G19481上可G1209G11487G1328是一G1022G4396G6930其他文G1226文G1226夹入口参G6980的G6980据表。G6164G1209G11458录的占G11004G12366G19400的大小并不等同于其G991G6164G7389G6980据的大小，但也不等同于0。G17902G5132是占很小的G12366G19400的，可G1209G11487G1328G11458录文G1226是一G1022简单的二维表文G1226。其G1867G1319G4396G1660G2419G10714是G726不管G11458录文G1226G6164占G12366G19400为G3822G4581G12763，一G12763为G3822G4581G4395节。系统都会G120932G1022G4395节为单G1313G17839G15904G11458录文G1226G6164占G12763的G2010G18209。G1783732G1022G4395节G1209确定的偏G12239来定G1053本G11458录G991的一G1022文G1226G6122文G1226夹的G4658性，G4466G19481上是一G1022简单的二维表。G1783732G1022G4395节的G2520G4395节偏G12239定G1053G3926G991G726A68A133A134A135A136A137A13837表54FAT32短文件目录项32个字节的表示定义A139A140A142A14416A146A149A139A140A150A160A1510X00X78A152A153A1540X80XA3A210A157A1540XB1A212A158A139A1400XC1A159A161A163A1660XD1A214A167A168A170A17210A217A175A1760XE0XF2A177A178A179A181A182A1840X100X112A177A178A179A181A186A1870X120X132A177A178A188A189A190A191A186A1870X140X152A177A178A193A194A196A197A198A19916A1760X160X172A177A178A198A188A200A201A202A182A1840X180X192A177A178A198A188A200A201A202A186A1870X1A0X1B2A177A178A193A194A196A197A198A20316A1760X1C0X1F4A177A178A198A204A205对于本G20045G11458我们只关心G1209G991几G1022G1461G5699G7261G709文G1226名、G6205展名G726G11004于查G6226文G1226G6122文G1226夹2G709文G1226G17227始G12763G2507G726G12651G1998文G1226G1660G4396的G17227始G3332G33483G709文G1226大小G726确定读G1998文G1226的大小532FAT32文件系统在SD卡上的实现在SDG2357中一次可G1209读G2474G1231G5859G4395节的G6980据，但在SDHCG2357中只能读G2474G1209512G4395节为单G1313的G6980据，为了兼G4493SDHCG2357，G6164G1209G6164G7389的SDG2357一次读G2474G1209512G4395节G708一G6171G2318G709为单G1313的G6980据。在ATMEGA16中，只G73891KB的RAM，G6164G1209只能划G2010G1998512G4395节G1328为SDG2357G6980据的G13543冲G2318。经过试G20576发现绝大G3822G6980的FAT32文G1226系统G18209G13634为G726FATG69802、根G11458录G12763G25072、每G6171G2318G4395节G6980512、每G12763G6171G2318G69808G708每G12763大小为4KG709。A206A207A208A209A211A213A17738读G2474FAT32文G1226系统主G16213G2010为G3926G991几步G7261G709读G2474DBR，确定FAT的G6171G2318G3348和根G11458录G6171G2318G3348G7272G709在根G11458录中遍历G16213打开的文G1226G6122文G1226夹G7273G709G5483G2052文G1226G6122文G1226夹的G17227始G12763G2507和文G1226大小，把当G2081G12763赋值为G17227始G12763G7274G709G17902过当G208