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  7. <title>SdFat: FatCache Class Reference</title>

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  26.    <div id="projectname">SdFat

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  62.     <ul class="tablist">

  63.       <li><a href="annotated.html"><span>Class&#160;List</span></a></li>

  64.       <li><a href="inherits.html"><span>Class&#160;Hierarchy</span></a></li>

  65.       <li><a href="functions.html"><span>Class&#160;Members</span></a></li>

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  80. </div>

  81. 

  82. </div><!-- top -->

  83. <div class="header">

  84.   <div class="summary">

  85. <a href="#pub-methods">Public Member Functions</a> &#124;

  86. <a href="#pub-static-attribs">Static Public Attributes</a> &#124;

  87. <a href="class_fat_cache-members.html">List of all members</a>  </div>

  88.   <div class="headertitle">

  89. <div class="title">FatCache Class Reference</div>  </div>

  90. </div><!--header-->

  91. <div class="contents">

  92. 

  93. <p>Block cache.  

  94.  <a href="class_fat_cache.html#details">More...</a></p>

  95. 

  96. <p><code>#include &lt;FatVolume.h&gt;</code></p>

  97. <table class="memberdecls">

  98. <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>

  99. Public Member Functions</h2></td></tr>

  100. <tr class="memitem:ab3d9c4f94af61065b6d6d0892827fd8a"><td class="memItemLeft" align="right" valign="top"><a class="el" href="unioncache__t.html">cache_t</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_fat_cache.html#ab3d9c4f94af61065b6d6d0892827fd8a">block</a> ()</td></tr>

  101. <tr class="separator:ab3d9c4f94af61065b6d6d0892827fd8a"><td class="memSeparator" colspan="2">&#160;</td></tr>

  102. <tr class="memitem:ab4d3b0c16bb6a116c7d01afff2dcb307"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_fat_cache.html#ab4d3b0c16bb6a116c7d01afff2dcb307">dirty</a> ()</td></tr>

  103. <tr class="separator:ab4d3b0c16bb6a116c7d01afff2dcb307"><td class="memSeparator" colspan="2">&#160;</td></tr>

  104. <tr class="memitem:ae1d8a2da1493b5ffca0520184daaddf1"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_fat_cache.html#ae1d8a2da1493b5ffca0520184daaddf1">init</a> (<a class="el" href="class_fat_volume.html">FatVolume</a> *vol)</td></tr>

  105. <tr class="separator:ae1d8a2da1493b5ffca0520184daaddf1"><td class="memSeparator" colspan="2">&#160;</td></tr>

  106. <tr class="memitem:a70071a128d647b49b523dbb2f5f944a5"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_fat_cache.html#a70071a128d647b49b523dbb2f5f944a5">invalidate</a> ()</td></tr>

  107. <tr class="separator:a70071a128d647b49b523dbb2f5f944a5"><td class="memSeparator" colspan="2">&#160;</td></tr>

  108. <tr class="memitem:a9f981b53e212f79937e5f6381b169374"><td class="memItemLeft" align="right" valign="top">uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_fat_cache.html#a9f981b53e212f79937e5f6381b169374">lbn</a> ()</td></tr>

  109. <tr class="separator:a9f981b53e212f79937e5f6381b169374"><td class="memSeparator" colspan="2">&#160;</td></tr>

  110. <tr class="memitem:ac2bb0b8f2ce3ab5cd86cf30b4a663cea"><td class="memItemLeft" align="right" valign="top"><a class="el" href="unioncache__t.html">cache_t</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_fat_cache.html#ac2bb0b8f2ce3ab5cd86cf30b4a663cea">read</a> (uint32_t <a class="el" href="class_fat_cache.html#a9f981b53e212f79937e5f6381b169374">lbn</a>, uint8_t option)</td></tr>

  111. <tr class="separator:ac2bb0b8f2ce3ab5cd86cf30b4a663cea"><td class="memSeparator" colspan="2">&#160;</td></tr>

  112. <tr class="memitem:a4d76d4f46ce5994f6fc4678a7b4f8cf1"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_fat_cache.html#a4d76d4f46ce5994f6fc4678a7b4f8cf1">sync</a> ()</td></tr>

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  114. </table><table class="memberdecls">

  115. <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-attribs"></a>

  116. Static Public Attributes</h2></td></tr>

  117. <tr class="memitem:ab4b446515ff9a0cebc747630ddd10c93"><td class="memItemLeft" align="right" valign="top">static const uint8_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_fat_cache.html#ab4b446515ff9a0cebc747630ddd10c93">CACHE_FOR_READ</a> = 0</td></tr>

  118. <tr class="separator:ab4b446515ff9a0cebc747630ddd10c93"><td class="memSeparator" colspan="2">&#160;</td></tr>

  119. <tr class="memitem:a81cb572f33443bd6aee9aa33ec395d0f"><td class="memItemLeft" align="right" valign="top">static const uint8_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_fat_cache.html#a81cb572f33443bd6aee9aa33ec395d0f">CACHE_FOR_WRITE</a> = <a class="el" href="class_fat_cache.html#aac8c38e5c545d0f80b13d816117f626e">CACHE_STATUS_DIRTY</a></td></tr>

  120. <tr class="separator:a81cb572f33443bd6aee9aa33ec395d0f"><td class="memSeparator" colspan="2">&#160;</td></tr>

  121. <tr class="memitem:adf974f55e53ee0aaa85abb0d7d67181c"><td class="memItemLeft" align="right" valign="top">static const uint8_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_fat_cache.html#adf974f55e53ee0aaa85abb0d7d67181c">CACHE_OPTION_NO_READ</a> = 4</td></tr>

  122. <tr class="separator:adf974f55e53ee0aaa85abb0d7d67181c"><td class="memSeparator" colspan="2">&#160;</td></tr>

  123. <tr class="memitem:a49d2896ff525ab77852f76df5c2a09c2"><td class="memItemLeft" align="right" valign="top">static const uint8_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_fat_cache.html#a49d2896ff525ab77852f76df5c2a09c2">CACHE_RESERVE_FOR_WRITE</a> = <a class="el" href="class_fat_cache.html#aac8c38e5c545d0f80b13d816117f626e">CACHE_STATUS_DIRTY</a> | <a class="el" href="class_fat_cache.html#adf974f55e53ee0aaa85abb0d7d67181c">CACHE_OPTION_NO_READ</a></td></tr>

  124. <tr class="separator:a49d2896ff525ab77852f76df5c2a09c2"><td class="memSeparator" colspan="2">&#160;</td></tr>

  125. <tr class="memitem:aac8c38e5c545d0f80b13d816117f626e"><td class="memItemLeft" align="right" valign="top">static const uint8_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_fat_cache.html#aac8c38e5c545d0f80b13d816117f626e">CACHE_STATUS_DIRTY</a> = 1</td></tr>

  126. <tr class="separator:aac8c38e5c545d0f80b13d816117f626e"><td class="memSeparator" colspan="2">&#160;</td></tr>

  127. <tr class="memitem:ab70dc4a2e387f0e9bf392044c702ae32"><td class="memItemLeft" align="right" valign="top">static const uint8_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_fat_cache.html#ab70dc4a2e387f0e9bf392044c702ae32">CACHE_STATUS_MASK</a> = <a class="el" href="class_fat_cache.html#aac8c38e5c545d0f80b13d816117f626e">CACHE_STATUS_DIRTY</a> | <a class="el" href="class_fat_cache.html#a45236e1c0a2a098f08d3add0e4b1467a">CACHE_STATUS_MIRROR_FAT</a></td></tr>

  128. <tr class="separator:ab70dc4a2e387f0e9bf392044c702ae32"><td class="memSeparator" colspan="2">&#160;</td></tr>

  129. <tr class="memitem:a45236e1c0a2a098f08d3add0e4b1467a"><td class="memItemLeft" align="right" valign="top">static const uint8_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_fat_cache.html#a45236e1c0a2a098f08d3add0e4b1467a">CACHE_STATUS_MIRROR_FAT</a> = 2</td></tr>

  130. <tr class="separator:a45236e1c0a2a098f08d3add0e4b1467a"><td class="memSeparator" colspan="2">&#160;</td></tr>

  131. </table>

  132. <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>

  133. <div class="textblock"><p>Block cache. </p>

  134. </div><h2 class="groupheader">Member Function Documentation</h2>

  135. <a class="anchor" id="ab3d9c4f94af61065b6d6d0892827fd8a"></a>

  136. <div class="memitem">

  137. <div class="memproto">

  138. <table class="mlabels">

  139.   <tr>

  140.   <td class="mlabels-left">

  141.       <table class="memname">

  142.         <tr>

  143.           <td class="memname"><a class="el" href="unioncache__t.html">cache_t</a>* FatCache::block </td>

  144.           <td>(</td>

  145.           <td class="paramname"></td><td>)</td>

  146.           <td></td>

  147.         </tr>

  148.       </table>

  149.   </td>

  150.   <td class="mlabels-right">

  151. <span class="mlabels"><span class="mlabel">inline</span></span>  </td>

  152.   </tr>

  153. </table>

  154. </div><div class="memdoc">

  155. <dl class="section return"><dt>Returns</dt><dd>Cache block address. </dd></dl>

  156. 

  157. </div>

  158. </div>

  159. <a class="anchor" id="ab4d3b0c16bb6a116c7d01afff2dcb307"></a>

  160. <div class="memitem">

  161. <div class="memproto">

  162. <table class="mlabels">

  163.   <tr>

  164.   <td class="mlabels-left">

  165.       <table class="memname">

  166.         <tr>

  167.           <td class="memname">void FatCache::dirty </td>

  168.           <td>(</td>

  169.           <td class="paramname"></td><td>)</td>

  170.           <td></td>

  171.         </tr>

  172.       </table>

  173.   </td>

  174.   <td class="mlabels-right">

  175. <span class="mlabels"><span class="mlabel">inline</span></span>  </td>

  176.   </tr>

  177. </table>

  178. </div><div class="memdoc">

  179. <p>Set current block dirty. </p>

  180. 

  181. </div>

  182. </div>

  183. <a class="anchor" id="ae1d8a2da1493b5ffca0520184daaddf1"></a>

  184. <div class="memitem">

  185. <div class="memproto">

  186. <table class="mlabels">

  187.   <tr>

  188.   <td class="mlabels-left">

  189.       <table class="memname">

  190.         <tr>

  191.           <td class="memname">void FatCache::init </td>

  192.           <td>(</td>

  193.           <td class="paramtype"><a class="el" href="class_fat_volume.html">FatVolume</a> *&#160;</td>

  194.           <td class="paramname"><em>vol</em></td><td>)</td>

  195.           <td></td>

  196.         </tr>

  197.       </table>

  198.   </td>

  199.   <td class="mlabels-right">

  200. <span class="mlabels"><span class="mlabel">inline</span></span>  </td>

  201.   </tr>

  202. </table>

  203. </div><div class="memdoc">

  204. <p>Initialize the cache. </p><dl class="params"><dt>Parameters</dt><dd>

  205.   <table class="params">

  206.     <tr><td class="paramdir">[in]</td><td class="paramname">vol</td><td><a class="el" href="class_fat_volume.html" title="Access FAT16 and FAT32 volumes on raw file devices. ">FatVolume</a> that owns this <a class="el" href="class_fat_cache.html" title="Block cache. ">FatCache</a>. </td></tr>

  207.   </table>

  208.   </dd>

  209. </dl>

  210. 

  211. </div>

  212. </div>

  213. <a class="anchor" id="a70071a128d647b49b523dbb2f5f944a5"></a>

  214. <div class="memitem">

  215. <div class="memproto">

  216. <table class="mlabels">

  217.   <tr>

  218.   <td class="mlabels-left">

  219.       <table class="memname">

  220.         <tr>

  221.           <td class="memname">void FatCache::invalidate </td>

  222.           <td>(</td>

  223.           <td class="paramname"></td><td>)</td>

  224.           <td></td>

  225.         </tr>

  226.       </table>

  227.   </td>

  228.   <td class="mlabels-right">

  229. <span class="mlabels"><span class="mlabel">inline</span></span>  </td>

  230.   </tr>

  231. </table>

  232. </div><div class="memdoc">

  233. <p>Invalidate current cache block. </p>

  234. 

  235. </div>

  236. </div>

  237. <a class="anchor" id="a9f981b53e212f79937e5f6381b169374"></a>

  238. <div class="memitem">

  239. <div class="memproto">

  240. <table class="mlabels">

  241.   <tr>

  242.   <td class="mlabels-left">

  243.       <table class="memname">

  244.         <tr>

  245.           <td class="memname">uint32_t FatCache::lbn </td>

  246.           <td>(</td>

  247.           <td class="paramname"></td><td>)</td>

  248.           <td></td>

  249.         </tr>

  250.       </table>

  251.   </td>

  252.   <td class="mlabels-right">

  253. <span class="mlabels"><span class="mlabel">inline</span></span>  </td>

  254.   </tr>

  255. </table>

  256. </div><div class="memdoc">

  257. <dl class="section return"><dt>Returns</dt><dd>Logical block number for cached block. </dd></dl>

  258. 

  259. </div>

  260. </div>

  261. <a class="anchor" id="ac2bb0b8f2ce3ab5cd86cf30b4a663cea"></a>

  262. <div class="memitem">

  263. <div class="memproto">

  264.       <table class="memname">

  265.         <tr>

  266.           <td class="memname"><a class="el" href="unioncache__t.html">cache_t</a> * FatCache::read </td>

  267.           <td>(</td>

  268.           <td class="paramtype">uint32_t&#160;</td>

  269.           <td class="paramname"><em>lbn</em>, </td>

  270.         </tr>

  271.         <tr>

  272.           <td class="paramkey"></td>

  273.           <td></td>

  274.           <td class="paramtype">uint8_t&#160;</td>

  275.           <td class="paramname"><em>option</em>&#160;</td>

  276.         </tr>

  277.         <tr>

  278.           <td></td>

  279.           <td>)</td>

  280.           <td></td><td></td>

  281.         </tr>

  282.       </table>

  283. </div><div class="memdoc">

  284. <p>Read a block into the cache. </p><dl class="params"><dt>Parameters</dt><dd>

  285.   <table class="params">

  286.     <tr><td class="paramdir">[in]</td><td class="paramname">lbn</td><td>Block to read. </td></tr>

  287.     <tr><td class="paramdir">[in]</td><td class="paramname">option</td><td>mode for cached block. </td></tr>

  288.   </table>

  289.   </dd>

  290. </dl>

  291. <dl class="section return"><dt>Returns</dt><dd>Address of cached block. </dd></dl>

  292. 

  293. </div>

  294. </div>

  295. <a class="anchor" id="a4d76d4f46ce5994f6fc4678a7b4f8cf1"></a>

  296. <div class="memitem">

  297. <div class="memproto">

  298.       <table class="memname">

  299.         <tr>

  300.           <td class="memname">bool FatCache::sync </td>

  301.           <td>(</td>

  302.           <td class="paramname"></td><td>)</td>

  303.           <td></td>

  304.         </tr>

  305.       </table>

  306. </div><div class="memdoc">

  307. <p>Write current block if dirty. </p><dl class="section return"><dt>Returns</dt><dd>true for success else false. </dd></dl>

  308. 

  309. </div>

  310. </div>

  311. <h2 class="groupheader">Member Data Documentation</h2>

  312. <a class="anchor" id="ab4b446515ff9a0cebc747630ddd10c93"></a>

  313. <div class="memitem">

  314. <div class="memproto">

  315. <table class="mlabels">

  316.   <tr>

  317.   <td class="mlabels-left">

  318.       <table class="memname">

  319.         <tr>

  320.           <td class="memname">const uint8_t FatCache::CACHE_FOR_READ = 0</td>

  321.         </tr>

  322.       </table>

  323.   </td>

  324.   <td class="mlabels-right">

  325. <span class="mlabels"><span class="mlabel">static</span></span>  </td>

  326.   </tr>

  327. </table>

  328. </div><div class="memdoc">

  329. <p>Cache block for read. </p>

  330. 

  331. </div>

  332. </div>

  333. <a class="anchor" id="a81cb572f33443bd6aee9aa33ec395d0f"></a>

  334. <div class="memitem">

  335. <div class="memproto">

  336. <table class="mlabels">

  337.   <tr>

  338.   <td class="mlabels-left">

  339.       <table class="memname">

  340.         <tr>

  341.           <td class="memname">const uint8_t FatCache::CACHE_FOR_WRITE = <a class="el" href="class_fat_cache.html#aac8c38e5c545d0f80b13d816117f626e">CACHE_STATUS_DIRTY</a></td>

  342.         </tr>

  343.       </table>

  344.   </td>

  345.   <td class="mlabels-right">

  346. <span class="mlabels"><span class="mlabel">static</span></span>  </td>

  347.   </tr>

  348. </table>

  349. </div><div class="memdoc">

  350. <p>Cache block for write. </p>

  351. 

  352. </div>

  353. </div>

  354. <a class="anchor" id="adf974f55e53ee0aaa85abb0d7d67181c"></a>

  355. <div class="memitem">

  356. <div class="memproto">

  357. <table class="mlabels">

  358.   <tr>

  359.   <td class="mlabels-left">

  360.       <table class="memname">

  361.         <tr>

  362.           <td class="memname">const uint8_t FatCache::CACHE_OPTION_NO_READ = 4</td>

  363.         </tr>

  364.       </table>

  365.   </td>

  366.   <td class="mlabels-right">

  367. <span class="mlabels"><span class="mlabel">static</span></span>  </td>

  368.   </tr>

  369. </table>

  370. </div><div class="memdoc">

  371. <p>Sync existing block but do not read new block. </p>

  372. 

  373. </div>

  374. </div>

  375. <a class="anchor" id="a49d2896ff525ab77852f76df5c2a09c2"></a>

  376. <div class="memitem">

  377. <div class="memproto">

  378. <table class="mlabels">

  379.   <tr>

  380.   <td class="mlabels-left">

  381.       <table class="memname">

  382.         <tr>

  383.           <td class="memname">const uint8_t FatCache::CACHE_RESERVE_FOR_WRITE = <a class="el" href="class_fat_cache.html#aac8c38e5c545d0f80b13d816117f626e">CACHE_STATUS_DIRTY</a> | <a class="el" href="class_fat_cache.html#adf974f55e53ee0aaa85abb0d7d67181c">CACHE_OPTION_NO_READ</a></td>

  384.         </tr>

  385.       </table>

  386.   </td>

  387.   <td class="mlabels-right">

  388. <span class="mlabels"><span class="mlabel">static</span></span>  </td>

  389.   </tr>

  390. </table>

  391. </div><div class="memdoc">

  392. <p>Reserve cache block for write - do not read from block device. </p>

  393. 

  394. </div>

  395. </div>

  396. <a class="anchor" id="aac8c38e5c545d0f80b13d816117f626e"></a>

  397. <div class="memitem">

  398. <div class="memproto">

  399. <table class="mlabels">

  400.   <tr>

  401.   <td class="mlabels-left">

  402.       <table class="memname">

  403.         <tr>

  404.           <td class="memname">const uint8_t FatCache::CACHE_STATUS_DIRTY = 1</td>

  405.         </tr>

  406.       </table>

  407.   </td>

  408.   <td class="mlabels-right">

  409. <span class="mlabels"><span class="mlabel">static</span></span>  </td>

  410.   </tr>

  411. </table>

  412. </div><div class="memdoc">

  413. <p>Cached block is dirty </p>

  414. 

  415. </div>

  416. </div>

  417. <a class="anchor" id="ab70dc4a2e387f0e9bf392044c702ae32"></a>

  418. <div class="memitem">

  419. <div class="memproto">

  420. <table class="mlabels">

  421.   <tr>

  422.   <td class="mlabels-left">

  423.       <table class="memname">

  424.         <tr>

  425.           <td class="memname">const uint8_t FatCache::CACHE_STATUS_MASK = <a class="el" href="class_fat_cache.html#aac8c38e5c545d0f80b13d816117f626e">CACHE_STATUS_DIRTY</a> | <a class="el" href="class_fat_cache.html#a45236e1c0a2a098f08d3add0e4b1467a">CACHE_STATUS_MIRROR_FAT</a></td>

  426.         </tr>

  427.       </table>

  428.   </td>

  429.   <td class="mlabels-right">

  430. <span class="mlabels"><span class="mlabel">static</span></span>  </td>

  431.   </tr>

  432. </table>

  433. </div><div class="memdoc">

  434. <p>Cache block status bits </p>

  435. 

  436. </div>

  437. </div>

  438. <a class="anchor" id="a45236e1c0a2a098f08d3add0e4b1467a"></a>

  439. <div class="memitem">

  440. <div class="memproto">

  441. <table class="mlabels">

  442.   <tr>

  443.   <td class="mlabels-left">

  444.       <table class="memname">

  445.         <tr>

  446.           <td class="memname">const uint8_t FatCache::CACHE_STATUS_MIRROR_FAT = 2</td>

  447.         </tr>

  448.       </table>

  449.   </td>

  450.   <td class="mlabels-right">

  451. <span class="mlabels"><span class="mlabel">static</span></span>  </td>

  452.   </tr>

  453. </table>

  454. </div><div class="memdoc">

  455. <p>Cashed block is FAT entry and must be mirrored in second FAT. </p>

  456. 

  457. </div>

  458. </div>

  459. <hr/>The documentation for this class was generated from the following files:<ul>

  460. <li>Arduino/libraries/SdFat/src/FatLib/<a class="el" href="_fat_volume_8h.html">FatVolume.h</a></li>

  461. <li>Arduino/libraries/SdFat/src/FatLib/FatVolume.cpp</li>

  462. </ul>

  463. </div><!-- contents -->

  464. <!-- start footer part -->

  465. <hr class="footer"/><address class="footer"><small>

  466. Generated on Fri Aug 19 2016 08:28:00 for SdFat by &#160;<a href="http://www.doxygen.org/index.html">

  467. <img class="footer" src="doxygen.png" alt="doxygen"/>

  468. </a> 1.8.10

  469. </small></address>

  470. </body>

  471. </html>