STM32F107--ReadSD.rar_STM32F107_科星 stm32f107_单片机开发_嵌入式/单片机/硬件编程下载-pudn.com

<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css"> <link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css"> <link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/622b93013d2fbb0007589dda/raw.css"> <script src="https://static.pudn.com/base/js/compatibility.min.js"></script> <script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/622b93013d2fbb0007589dda/bg1.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">科星<span class="_ _0"> </span><span class="ff2">F107<span class="_"> </span></span>开发<span class="_ _1"></span>板学习笔记<span class="ff2 ws1"> <span class="fc1 ls1 ws2">http://<span class="_ _2"></span>corxs<span class="_ _2"></span>tm32.taobao.c<span class="_ _2"></span>om/<span class="fc0 ls0 ws0"> </span></span></span></div><div class="t m0 x2 h2 y2 ff1 fs0 fc0 sc0 ls0 ws0">科星官方<span class="_ _0"> </span><span class="ff2 ls1 ws2">QQ <span class="_ _0"> </span></span>交流群<span class="ff2"> <span class="_ _3"> </span>144728423 </span></div><div class="t m0 x1 h3 y3 ff1 fs1 fc0 sc1 ls2 ws3">第十五<span class="ls0 ws0">节<span class="ff3 sc0"> <span class="_ _4"> </span><span class="ls3 ws4">SD<span class="_ _5"> </span></span></span></span>文件系统的学习<span class="ff3 sc0 ls0 ws0"> </span></div><div class="t m0 x1 h4 y4 ff2 fs2 fc0 sc0 ls0 ws0"> <span class="_ _6"> </span><span class="ff1 ls4 ws5">本节我们通过科星</span><span class="ls5 ws6">F107<span class="_ _4"> </span><span class="ff1 ls4 ws5">开发板的</span><span class="ls6 ws7">SPI<span class="ff1 ls4 ws5">接口对</span>SD<span class="ff1 ls4 ws5">卡进行数据的读写。</span></span></span><span class="ff1">主要学习的内容就是</span><span class="ls6 ws7">SPI</span></div><div class="t m0 x1 h4 y5 ff1 fs2 fc0 sc0 ls0 ws0">的配置与文件系统的移植。<span class="_ _7"></span>这里我们用到的文件系统是<span class="ff2 ls7 ws8">Fat<span class="_ _8"></span>Fs<span class="_ _1"></span>,<span class="_ _8"></span></span><span class="ff2"> <span class="ls7 ws8">Fat<span class="_ _8"></span>FS<span class="_ _1"></span></span> <span class="_ _1"></span></span>是一个通用的文件系统模块，</div><div class="t m0 x1 h4 y6 ff1 fs2 fc0 sc0 ls0 ws0">用于在小型嵌入式系统中实现<span class="ff2 ls8 ws9">FAT<span class="_ _9"></span></span>文件系统。<span class="_ _7"></span><span class="ff2"> <span class="_ _a"> </span><span class="ls7 ws8">Fat<span class="_ _8"></span>Fs<span class="_ _1"></span> <span class="_ _a"> </span></span><span class="ff1">的编写遵循</span><span class="wsa">ANSI C</span><span class="ff1">，<span class="_ _7"></span>因此不依赖于硬件平台。</span></span></div><div class="t m0 x1 h4 y7 ff1 fs2 fc0 sc0 ls0 ws0">它可以嵌入到便宜的微控制器中，<span class="_ _b"></span>如<span class="ff2"> <span class="_ _3"> </span><span class="ls5 wsb">8051, PIC, A<span class="_ _2"></span>V<span class="_ _2"></span>R, SH, Z80, H8, ARM<span class="_ _2"></span> <span class="_ _a"> </span><span class="ff1 ls0 ws0">等等，<span class="_ _b"></span>不需要做任何修改。</span></span></span></div><div class="t m0 x1 h4 y8 ff1 fs2 fc0 sc0 ls0 ws0">它的官方网址<span class="_ _3"> </span><span class="ff2 fc1">ht<span class="_ _2"></span>tp://elm-chan.org/fsw/ff/00inde<span class="_ _2"></span>x_e.html</span></div><div class="t m0 x3 h4 y9 ff1 fs2 fc0 sc0 ls0 ws0">。<span class="ff2"> </span></div><div class="t m0 x1 h5 ya ff2 fs2 fc0 sc0 ls0 ws0"> <span class="_ _6"> </span> </div><div class="t m0 x4 h4 yb ff2 fs2 fc0 sc0 ls6 ws7">SD<span class="_ _3"> </span><span class="ff1 ls0 ws0">相关的硬件原理图如下：<span class="ff2"> </span></span></div><div class="t m0 x5 h5 yc ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x6 h5 yd ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h4 ye ff2 fs2 fc0 sc0 ls0 ws0"> <span class="_ _6"> </span><span class="ff1">又要这里我们用到串口打印信息，所以需要短接串口的跳线，短接图示的引脚，如图：</span> </div><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a></div><div class="pi" data-data='{"ctm":[1.568627,0.000000,0.000000,1.568627,0.000000,0.000000]}'></div></div> </body> </html>

<div id="pf2" class="pf w0 h0" data-page-no="2"><div class="pc pc2 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/622b93013d2fbb0007589dda/bg2.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">科星<span class="_ _0"> </span><span class="ff2">F107<span class="_"> </span></span>开发<span class="_ _1"></span>板学习笔记<span class="ff2 ws1"> <span class="fc1 ls1 ws2">http://<span class="_ _2"></span>corxs<span class="_ _2"></span>tm32.taobao.c<span class="_ _2"></span>om/<span class="fc0 ls0 ws0"> </span></span></span></div><div class="t m0 x2 h2 y2 ff1 fs0 fc0 sc0 ls0 ws0">科星官方<span class="_ _0"> </span><span class="ff2 ls1 ws2">QQ <span class="_ _0"> </span></span>交流群<span class="ff2"> <span class="_ _3"> </span>144728423 </span></div><div class="t m0 x7 h6 yf ff4 fs3 fc0 sc0 ls0 ws0"> </div><div class="t m0 x8 h5 y10 ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x8 h4 y11 ff1 fs2 fc0 sc0 ls0 ws0">我们先讲一下<span class="_ _3"> </span><span class="ff2 ls7 ws8">Fat<span class="_ _8"></span>Fs<span class="_ _a"> </span></span>文件系统，它的软件结构如下图：<span class="ff2"> </span></div><div class="t m0 x8 h5 y12 ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x9 h5 y13 ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x8 h5 y14 ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x4 h7 y15 ff1 fs2 fc0 sc0 ls0 ws0">最顶层是应用层，使用者无需理会<span class="ff5 ls5 wsc">FatFs Module<span class="_ _2"></span> <span class="_"> </span><span class="ff1 ls0 ws0">的内部结构和复杂的</span><span class="ls6 ws7">FAT <span class="_"> </span><span class="ff1 ls0 ws0">协议，只需<span class="ff6"> </span></span></span></span></div><div class="t m0 x1 h7 y16 ff1 fs2 fc0 sc0 ls0 ws0">要调用<span class="ff5 ls5 wsc">FatFs Module <span class="_"> </span></span>提供<span class="_ _2"></span>给用户的一系列应用接口函数，如<span class="ff5 ls9 wsd">f_open</span>，<span class="ff5 ls6 ws7">f_read</span>，<span class="ff5 ls6 ws7">f_write<span class="_ _1"></span> <span class="_"> </span></span>和<span class="ff5 ls9 wsd">f_close</span><span class="ff5"> </span></div><div class="t m0 x1 h7 y17 ff1 fs2 fc0 sc0 ls0 ws0">等，就可以像在<span class="ff5 ls6 ws7">PC <span class="_"> </span></span>上读／写文件那样简单。<span class="ff6"> </span></div><div class="t m0 x4 h7 y18 ff1 fs2 fc0 sc0 ls0 ws0">中间层<span class="ff5 ls5 wsc">FatFs Module <span class="_"> </span></span><span class="lsa wse">实现了<span class="ff5 ls6 ws7">FAT <span class="_"> </span></span></span>文件读／写协议。<span class="ff5 ls5 wsc">FatFs Module<span class="_ _2"></span> <span class="_"> </span><span class="ff1 ls0 ws0">的完全版提供的是</span><span class="ls6 ws7">ff.c<span class="ff1 ls0 ws0">、<span class="ff6"> </span></span></span></span></div><div class="t m0 x1 h7 y19 ff5 fs2 fc0 sc0 ls6 ws7">ff.h<span class="ff1 ls0 ws0">，简化版</span><span class="lsb wsc">Tiny<span class="ls0 ws0">-</span></span>FatFs <span class="_"> </span><span class="ff1 ls0 ws0">提供的是</span>tff.c<span class="_ _1"></span><span class="ff1 ls0 ws0">、</span>tff.h<span class="ff1 ls0 ws0">。除非有必要，使用者一般不用修改，使用时将<span class="ff6"> </span></span></div><div class="t m0 x1 h4 y1a ff1 fs2 fc0 sc0 ls0 ws0">需要版本的头文件直接包含进去即可。<span class="ff6"> </span></div><div class="t m0 x4 h7 y1b ff1 fs2 fc0 sc0 ls0 ws0">需要使用者编写移植代码的是<span class="ff5 ls5 wsc">FatFs Module <span class="_"> </span></span>提供<span class="_ _2"></span>的底层接口，它包括存储媒介读／写<span class="ff6"> </span></div><div class="t m0 x1 h7 y1c ff1 fs2 fc0 sc0 ls0 ws0">接口<span class="ff5 ls6 wsa">Disk I/O <span class="_"> </span></span>和供给文件创建修改时间的实时时钟。</div><div class="t m0 xa h8 y1d ff6 fs4 fc0 sc0 ls0 ws0"> </div><div class="t m0 x8 h5 y1e ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x8 h5 y1f ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 xb h4 y20 ff1 fs2 fc0 sc0 ls0 ws0">本例程的程序结构图</div><div class="c xc y21 w2 h9"><div class="t m0 xd h5 y22 ff2 fs2 fc0 sc0 ls0 ws0"> </div></div><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a></div><div class="pi" data-data='{"ctm":[1.568627,0.000000,0.000000,1.568627,0.000000,0.000000]}'></div></div>

<div id="pf3" class="pf w0 h0" data-page-no="3"><div class="pc pc3 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/622b93013d2fbb0007589dda/bg3.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">科星<span class="_ _0"> </span><span class="ff2">F107<span class="_"> </span></span>开发<span class="_ _1"></span>板学习笔记<span class="ff2 ws1"> <span class="fc1 ls1 ws2">http://<span class="_ _2"></span>corxs<span class="_ _2"></span>tm32.taobao.c<span class="_ _2"></span>om/<span class="fc0 ls0 ws0"> </span></span></span></div><div class="t m0 x2 h2 y2 ff1 fs0 fc0 sc0 ls0 ws0">科星官方<span class="_ _0"> </span><span class="ff2 ls1 ws2">QQ <span class="_ _0"> </span></span>交流群<span class="ff2"> <span class="_ _3"> </span>144728423 </span></div><div class="t m0 x8 h5 y23 ff2 fs2 fc0 sc0 ls0 ws0"> <span class="_ _c"> </span> </div><div class="t m0 x1 h5 y24 ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h5 y25 ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 ha y26 ff7 fs5 fc0 sc0 lsc wsf">F<span class="_ _2"></span>atF<span class="_ _2"></span>s<span class="_ _3"> </span><span class="ff1 ls0 ws0">模块的应用（官方应用笔记，没有兴趣的可以跳过）<span class="ff7"> </span></span></div><div class="t m0 x1 hb y27 ff8 fs5 fc0 sc0 ls0 ws0">1<span class="ff1 sc1 lsd ws10">、如何移植（这里仅仅是翻译，后面会有自己的理解<span class="ls0 ws0">）</span></span> </div><div class="t m0 x1 h4 y28 ff1 fs2 fc0 sc0 ls0 ws0">（官方应用笔记链接<span class="_ _3"> </span><span class="ff2 fc1">ht<span class="_ _2"></span>tp://elm-chan.org/fsw/ff/<span class="_ _2"></span>en/appnote.h<span class="_ _2"></span>tml#port<span class="ff1 fc0">）<span class="ff2"> </span></span></span></div><div class="t m0 x1 h5 y29 ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h4 y2a ff2 fs2 fc0 sc0 lse wsb">1.1<span class="ff1 ls0 ws0">注意事项：<span class="ff2"> </span></span></div><div class="t m0 xe h4 y2b ff1 fs2 fc0 sc0 ls0 ws0">在移植<span class="ff2 ls7 ws8">Fat<span class="_ _8"></span>FS<span class="_ _8"></span></span>模块时，需满足以下条件<span class="ff2"> </span></div><div class="t m0 xe h7 y2c ff5 fs2 fc0 sc0 ls0 ws0">1<span class="ff1">）</span><span class="ls6 wsa">ANSI C</span> </div><div class="t m0 xe h7 y2d ff5 fs2 fc0 sc0 ls6 ws7">FatFs <span class="_"> </span><span class="ff1 ls0 ws0">模块是用</span><span class="wsa">ANSI C <span class="_"> </span><span class="ff1 ls0 ws0">编写的中间件，只要编译器遵循</span><span class="ws11">ANSI C<span class="ff1 ls0 ws0">，它都是与平台无关的。<span class="ff6"> </span></span></span></span></div><div class="t m0 x4 h7 y2e ff5 fs2 fc0 sc0 ls0 ws0">2<span class="ff1">）整型大小<span class="ff6"> </span></span></div><div class="t m0 x4 h7 y2f ff5 fs2 fc0 sc0 ls6 ws7">FatFs <span class="_"> </span><span class="ff1 ls0 ws0">假定</span><span class="lsf wsa">char<span class="_ _1"></span>/short/<span class="_ _1"></span>long <span class="_"> </span><span class="ff1 ls0 ws0">的长度为</span>8/16/<span class="_ _1"></span>32 <span class="_"> </span><span class="ff1 ls10 ws12">位<span class="_ _d"> </span>，而<span class="_ _d"> </span></span>int <span class="_"> </span><span class="ff1 ls0 ws0">为</span>16 <span class="_"> </span><span class="ff1 ls0 ws0">位或</span>32 <span class="_"> </span><span class="ff1 ls0 ws0">位，<span class="_ _e"></span>这些相应的定义位</span></span></div><div class="t m0 x1 h7 y30 ff1 fs2 fc0 sc0 ls0 ws0">于<span class="ff5 ls5 ws6">integer.h <span class="_"> </span></span>文件。这在大多数的编译器上都不会有问题，但是当与预定义的内容发生冲突时，</div><div class="t m0 x1 h4 y31 ff1 fs2 fc0 sc0 ls0 ws0">需要用户注意。<span class="ff6"> </span></div><div class="t m0 x1 hc y32 ff5 fs4 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h4 y33 ff2 fs2 fc0 sc0 lse wsb">1.2<span class="_ _3"> </span><span class="ff1 ls0 ws0">系统结构<span class="ff2"> </span></span></div><div class="t m0 x4 h5 y34 ff2 fs2 fc0 sc0 ls0 ws13">The dependency diagr<span class="_ _2"></span>am shown below is a typical configur<span class="_ _2"></span>ation of the embedded s<span class="_ _2"></span>ystem with </div><div class="t m0 x1 h5 y35 ff2 fs2 fc0 sc0 ls0 wsa">F<span class="_ _2"></span>atFs module.<span class="ws0"> </span></div><div class="t m0 x4 h4 y36 ff1 fs2 fc0 sc0 ls0 ws0">下图展示了一个使用<span class="_ _3"> </span><span class="ff2 ls7 ws8">Fat<span class="_ _8"></span>Fs<span class="_ _a"> </span></span>模块的嵌入式系统的典型配置。<span class="ff2"> </span></div><div class="t m0 xf h5 y37 ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x10 hd y38 ff3 fs5 fc2 sc0 ls0 ws0">f<span class="ls11 ws14">a<span class="_ _2"></span>tfs.c<span class="ls0 ws0"> </span></span></div><div class="t m0 x11 hd y39 ff3 fs5 fc2 sc0 ls12 ws15">ff<span class="_ _2"></span><span class="ls11 ws14">.c<span class="ls0 ws0"> </span></span></div><div class="t m0 xc hd y3a ff3 fs5 fc2 sc0 ls0 ws0">D<span class="ls12 ws15">iskio.c</span> </div><div class="t m0 x12 hd y3b ff3 fs5 fc2 sc0 lsc wsf">SD_driv<span class="_ _2"></span>er<span class="_ _f"></span>.c<span class="ls0 ws0"> </span></div><div class="t m0 x13 hd y3c ff3 fs5 fc2 sc0 lsc wsf">RT<span class="_ _2"></span>C_time<span class="ls11 ws14">.c<span class="ls0 ws0"> </span></span></div><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a></div><div class="pi" data-data='{"ctm":[1.568627,0.000000,0.000000,1.568627,0.000000,0.000000]}'></div></div>

<div id="pf4" class="pf w0 h0" data-page-no="4"><div class="pc pc4 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/622b93013d2fbb0007589dda/bg4.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">科星<span class="_ _0"> </span><span class="ff2">F107<span class="_"> </span></span>开发<span class="_ _1"></span>板学习笔记<span class="ff2 ws1"> <span class="fc1 ls1 ws2">http://<span class="_ _2"></span>corxs<span class="_ _2"></span>tm32.taobao.c<span class="_ _2"></span>om/<span class="fc0 ls0 ws0"> </span></span></span></div><div class="t m0 x2 h2 y2 ff1 fs0 fc0 sc0 ls0 ws0">科星官方<span class="_ _0"> </span><span class="ff2 ls1 ws2">QQ <span class="_ _0"> </span></span>交流群<span class="ff2"> <span class="_ _3"> </span>144728423 </span></div><div class="t m0 x1 h5 y3d ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h5 y3e ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h5 y3f ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h5 y40 ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h5 y41 ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h4 y42 ff1 fs2 fc0 sc0 ls0 ws0">哪一个功能是必须的？<span class="ff2"> </span></div><div class="t m0 x1 h5 y43 ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x4 h7 y44 ff5 fs2 fc0 sc0 ls6 ws7">FatFs <span class="_"> </span><span class="ff1 ls0 ws0">只要求提供</span>FatFs <span class="_ _3"> </span><span class="ff1 ls0 ws0">模块所必需的底层磁盘</span>I/O <span class="_ _3"> </span><span class="ff1 ls0 ws0">函数，如果存在一个可工作的目标磁<span class="ff6"> </span></span></div><div class="t m0 x1 h7 y45 ff1 fs2 fc0 sc0 ls0 ws0">盘模块，你仅需将编写的新函数附加到<span class="ff5 ls6 ws7">FatFs <span class="_"> </span></span>模块上，如果没有，则需要提供其它磁盘模块<span class="ff6"> </span></div><div class="t m0 x1 h7 y46 ff1 fs2 fc0 sc0 ls0 ws0">或者从头编写底层驱动。<span class="ff5 ls6 ws7">FatFs <span class="_"> </span></span>中所有定义的函数并不总是必需的，例如，在只读配置模式<span class="ff6"> </span></div><div class="t m0 x1 h7 y47 ff1 fs2 fc0 sc0 ls0 ws0">下，磁盘写函数是不需要的。下表显示了<span class="ff5 ls6 ws7">FatFs <span class="_"> </span></span>的函数需要依赖于配置选项。</div><div class="t m0 x14 hc y48 ff5 fs4 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h5 y49 ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h5 y4a ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x15 h5 y4b ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h5 y4c ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h5 y4d ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 hb y4e ff8 fs5 fc0 sc0 ls0 ws0">2<span class="ff1 sc1">、</span><span class="ls12 ws15">FatFs<span class="_"> </span><span class="ff1 sc1 lsd ws10">应用范围</span></span><span class="ws16"> </span> </div><div class="t m0 x1 h4 y4f ff1 fs2 fc0 sc0 ls0 ws0">支持<span class="_ _3"> </span><span class="ff2 ls8 ws9">FAT<span class="_ _9"></span>1<span class="_ _8"></span>2<span class="_ _9"></span></span>、<span class="ff2 ls5 ws6">F<span class="_ _2"></span>A<span class="_ _e"></span>T16 <span class="_ _a"> </span><span class="ff1 ls0 ws0">和<span class="_ _3"> </span></span><span class="ls8 ws9">FAT<span class="_ _9"></span>3<span class="_ _8"></span>2<span class="_ _9"></span><span class="ff1 ls0 ws0">；<span class="ff2"> </span></span></span></span></div><div class="t m0 x1 h4 y50 ff1 fs2 fc0 sc0 ls0 ws0">可打开的文件：无限制，依赖于有效的存储器；<span class="ff2"> </span></div><div class="t m0 x1 h4 y51 ff1 fs2 fc0 sc0 ls0 ws0">支持最多<span class="_ _3"> </span><span class="ff2 ls5 ws6">10 <span class="_ _3"> </span></span>个卷；<span class="ff2"> </span></div><div class="t m0 x1 h4 y52 ff1 fs2 fc0 sc0 ls0 ws0">文件大小：与<span class="_ _3"> </span><span class="ff2 ls8 ws9">FAT<span class="_ _9"></span> <span class="_ _3"> </span></span>类型有关<span class="ff2 wsa">(upto 4G<span class="ws0">-1 <span class="ls13 ws11">by<span class="_ _1"></span>tes)<span class="_ _1"></span></span></span></span>；<span class="ff2"> </span></div><div class="t m0 x1 h4 y53 ff1 fs2 fc0 sc0 ls0 ws0">卷大小：与<span class="_ _3"> </span><span class="ff2 ls8 ws9">FAT<span class="_ _9"></span> <span class="_ _3"> </span></span>类型有关<span class="ff2 wsa">(upto 2T bytes on 512 b<span class="_ _2"></span>ytes/sect<span class="_ _2"></span>or)<span class="ff1 ws0">；<span class="ff2"> </span></span></span></div><div class="t m0 x1 h4 y54 ff1 fs2 fc0 sc0 ls0 ws0">簇大小：与<span class="_ _3"> </span><span class="ff2 ls8 ws9">FAT<span class="_ _9"></span> <span class="_ _3"> </span></span>类型有关<span class="ff2 wsa">(upto 64K bytes on 512 byt<span class="_ _2"></span>es/sector)<span class="ff1 ws0">；<span class="ff2"> </span></span></span></div><div class="t m0 x1 h4 y55 ff1 fs2 fc0 sc0 ls0 ws0">扇区大小：与<span class="_ _3"> </span><span class="ff2 ls8 ws9">FAT<span class="_ _9"></span> <span class="_ _3"> </span></span>类型有关<span class="ff2 wsd">(upto 4K bytes)</span>。<span class="ff2"> </span></div><div class="t m0 x1 h5 y56 ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h5 y57 ff2 fs2 fc0 sc0 ls0 ws0"> </div><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a></div><div class="pi" data-data='{"ctm":[1.568627,0.000000,0.000000,1.568627,0.000000,0.000000]}'></div></div>

<div id="pf5" class="pf w0 h0" data-page-no="5"><div class="pc pc5 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/622b93013d2fbb0007589dda/bg5.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">科星<span class="_ _0"> </span><span class="ff2">F107<span class="_"> </span></span>开发<span class="_ _1"></span>板学习笔记<span class="ff2 ws1"> <span class="fc1 ls1 ws2">http://<span class="_ _2"></span>corxs<span class="_ _2"></span>tm32.taobao.c<span class="_ _2"></span>om/<span class="fc0 ls0 ws0"> </span></span></span></div><div class="t m0 x2 h2 y2 ff1 fs0 fc0 sc0 ls0 ws0">科星官方<span class="_ _0"> </span><span class="ff2 ls1 ws2">QQ <span class="_ _0"> </span></span>交流群<span class="ff2"> <span class="_ _3"> </span>144728423 </span></div><div class="t m0 x1 he y58 ff8 fs5 fc0 sc0 ls0 ws0">1<span class="ff1 sc1">、</span><span class="ff9"> <span class="_ _2"></span><span class="ff1 sc1 lsd ws10">内存使用<span class="ff8 sc0 ls0 ws0"> </span></span></span></div><div class="t m0 x16 hf y59 ff5 fs6 fc0 sc0 ls0 ws0"> </div><div class="t m0 xd h7 y5a ff1 fs2 fc0 sc0 ls0 ws0">（英文原文）<span class="ff5 ls5 wsc">These are the m<span class="_ _2"></span>emory usage on som<span class="_ _2"></span>e target systems with f<span class="_ _2"></span>ollowing condition. T<span class="_ _2"></span>he </span></div><div class="t m0 xd h10 y5b ff5 fs2 fc0 sc0 ls5 ws17">memory s<span class="_ _2"></span>izes are in <span class="ls9 ws18">unit of byte,<span class="_ _2"></span><span class="ls0 ws0"> <span class="ff8">V</span> <span class="ls9 ws19">denotes num<span class="_ _2"></span>ber of volumes<span class="_ _2"></span> and<span class="ls0 ws0"> <span class="ff8">F</span> <span class="ls5 ws1a">denotes number of open f<span class="_ _2"></span>iles. </span></span></span></span></span></div><div class="t m0 xd h7 y5c ff5 fs2 fc0 sc0 ls5 wsc">All samples ar<span class="_ _2"></span>e optimezed in code siz<span class="_ _2"></span>e.<span class="ls0 ws0"> </span></div><div class="t m0 x1 h4 y5d ff2 fs2 fc0 sc0 ls0 ws0"> <span class="_ _3"> </span><span class="ff1">这里有一些下列条件的目标系统的内存使用。<span class="_ _2"></span>内存大小是以<span class="_ _3"> </span><span class="ff2 ls13 ws11">byte<span class="_ _3"> </span></span>为单位的，<span class="_ _10"></span><span class="ff2">V<span class="_ _3"> </span><span class="ff1">表示卷，<span class="_ _f"></span><span class="ff2">F<span class="_ _3"> </span><span class="ff1 ls4 ws5">表示</span></span></span></span></span></div><div class="t m0 x1 h4 y5e ff1 fs2 fc0 sc0 ls0 ws0">打开的文件，<span class="ff2"> </span></div><div class="t m0 xd h11 y5f ffa fs4 fc0 sc0 ls14 ws1b">FatFs R0.10 options:<span class="_ _2"></span><span class="ls0 ws0"> </span></div><div class="t m0 xd h11 y60 ffa fs4 fc0 sc0 ls14 ws1c">_FS_READONLY 0 <span class="_ _1"></span>(R/W), <span class="_ _1"></span>1 <span class="_ _8"></span>(R/O)<span class="ls0 ws0"> </span></div><div class="t m0 xd h11 y61 ffa fs4 fc0 sc0 ls14 ws1c">_FS_MINIMIZE <span class="ls0 ws1d"> </span><span class="ws0">0 (F<span class="_ _2"></span>ull function), 3 (<span class="_ _2"></span>Minimized function)<span class="_ _2"></span><span class="ls0"> </span></span></div><div class="t m0 xd h11 y62 ffa fs4 fc0 sc0 ls14 ws1c">_USE_STRFUNC 0 <span class="_ _1"></span>(Disable <span class="_ _1"></span>string <span class="_ _8"></span>functions)<span class="ls0 ws0"> </span></div><div class="t m0 xd h11 y63 ffa fs4 fc0 sc0 ls14 ws1c">_USE_MKFS 0 <span class="_ _1"></span>(Disable <span class="_ _8"></span>f_mkfs <span class="_ _1"></span>function)<span class="ls0 ws0"> </span></div><div class="t m0 xd h11 y64 ffa fs4 fc0 sc0 ls14 ws1c">_USE_FORWARD 0 <span class="_ _1"></span>(Disable <span class="_ _1"></span>f_forward <span class="_ _8"></span>function)<span class="_ _2"></span><span class="ls0 ws0"> </span></div><div class="t m0 xd h11 y65 ffa fs4 fc0 sc0 ls14 ws1c">_USE_FASTSEEK 0 <span class="_ _1"></span>(Disable <span class="_ _1"></span>fast <span class="_ _8"></span>seek <span class="_ _1"></span>feature)<span class="ls0 ws0"> </span></div><div class="t m0 xd h11 y66 ffa fs4 fc0 sc0 ls14 ws1c">_CODE_PAGE 932 <span class="_ _1"></span>(Jap<span class="ws1b">anese Shift<span class="ls0 ws0">-</span><span class="ws1e">JIS)<span class="_ _2"></span><span class="ls0 ws0"> </span></span></span></div><div class="t m0 xd h11 y67 ffa fs4 fc0 sc0 ls14 ws1c">_USE_LFN 0 <span class="_ _8"></span>(Disable <span class="_ _1"></span>LFN)<span class="ls0 ws0"> </span></div><div class="t m0 xd h11 y68 ffa fs4 fc0 sc0 ls14 ws1c">_MAX_SS 512 <span class="_ _8"></span>(Fixed <span class="_ _1"></span>sector <span class="_ _1"></span>size)<span class="ls0 ws0"> </span></div><div class="t m0 xd h11 y69 ffa fs4 fc0 sc0 ls14 ws1c">_FS_RPATH 0 <span class="_ _1"></span>(Disable <span class="_ _8"></span>relative <span class="_ _1"></span>path <span class="_ _1"></span>feature)<span class="ls0 ws0"> </span></div><div class="t m0 xd h11 y6a ffa fs4 fc0 sc0 ls14 ws1c">_FS_LABEL 0 <span class="_ _1"></span>(Disable <span class="_ _8"></span>volume <span class="_ _1"></span>label <span class="_ _8"></span>functions<span class="_ _2"></span>)<span class="ls0 ws0"> </span></div><div class="t m0 xd h11 y6b ffa fs4 fc0 sc0 ls14 ws0">_VOLUMES <span class="_ _10"></span> <span class="_ _10"></span> <span class="_ _2"></span> <span class="_ _10"></span> <span class="_ _2"></span> <span class="_ _2"></span> <span class="_ _10"></span> <span class="_ _2"></span> <span class="_ _2"></span>V (Number<span class="_ _2"></span> of logical drives<span class="_ _2"></span> to be used)<span class="ls0"> </span></div><div class="t m0 xd h11 y6c ffa fs4 fc0 sc0 ls14 ws1e">_MULT<span class="ws0">I_PARTITIO<span class="_ _2"></span>N 0 (Single partit<span class="_ _2"></span>ion per drive)<span class="ls0"> </span></span></div><div class="t m0 xd h11 y6d ffa fs4 fc0 sc0 ls14 ws1c">_FS_REENTRANT 0 <span class="_ _1"></span>(Disable <span class="_ _1"></span>reentrancy)<span class="ls0 ws0"> </span></div><div class="t m0 xd h11 y6e ffa fs4 fc0 sc0 ls14 ws1c">_FS_LOCK 0 <span class="_ _8"></span>(Disable <span class="_ _1"></span>file <span class="_ _1"></span>lock <span class="_ _8"></span>control)<span class="ls0 ws0"> </span></div><div class="t m0 x1 h5 y6f ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h5 y70 ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h5 y71 ff2 fs2 fc0 sc0 ls0 ws0"> </div><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a></div><div class="pi" data-data='{"ctm":[1.568627,0.000000,0.000000,1.568627,0.000000,0.000000]}'></div></div>