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  6. <link rel="start" title="Site Top" href="../../">

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  7. <link rel="up" title="Freewares" href="../../fsw_e.html">

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  8. <link rel="stylesheet" href="css_e.css" type="text/css" media="screen" title="ELM Default">

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  10. <title>ELM - Petit FAT File System Module</title>

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  14. <h1>Petit FAT File System Module</h1>

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  17. <div class="abst">

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  18. <img src="img/layers3.png" class="rset" width="245" height="255" alt="layer">

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  19. <p>Petit FatFs is a sub-set of FatFs module for tiny 8-bit microcontrollers. It is written in compliance with ANSI C and completely separated from the disk I/O layer. It can be incorporated into the tiny microcontrollers with a small memory even if the RAM size is less than sector size. Full featured FAT file system module is <a href="http://elm-chan.org/fsw/ff/00index_e.html">here</a>.</p>

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  21. <h4>Features</h4>

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  22. <ul>

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  23.  <li>Very small RAM consumption (46 bytes work area + certain stack).</li>

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  24.  <li>Very small code size (2K-4K bytes).</li>

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  25.  <li>FAT12, FAT16 and FAT32.</li>

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  26.  <li>Single volume and Single file.</li>

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  27.  <li>File write function with some restrictions.</li>

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  28. </ul>

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  33. <h3>Application Interface</h3>

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  34. <p>Petit FatFs module provides following functions.</p>

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  35. <ul>

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  36. <li><a href="pf/mount.html">pf_mount</a> - Mount/Unmount a Volume</li>

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  37. <li><a href="pf/open.html">pf_open</a> - Open a File</li>

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  38. <li><a href="pf/read.html">pf_read</a> - Read File</li>

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  39. <li><a href="pf/write.html">pf_write</a> - Write File</li>

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  40. <li><a href="pf/lseek.html">pf_lseek</a> - Move R/W Pointer</li>

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  41. <li><a href="pf/opendir.html">pf_opendir</a> - Open a Directory</li>

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  42. <li><a href="pf/readdir.html">pf_readdir</a> - Read a Directory Item</li>

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  43. </ul>

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  44. </div>

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  48. <h3>Disk I/O Interface</h3>

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  49. <p>Since the Petit FatFs module is completely separated from disk I/O layer, it requires following functions to lower layer to read the physical disk. The low level disk I/O module is not a part of Petit FatFs module and it must be provided by user. The sample drivers are also available in the resources.</p>

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  50. <ul>

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  51. <li><a href="pf/dinit.html">disk_initialize</a> - Initialize disk drive</li>

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  52. <li><a href="pf/dreadp.html">disk_readp</a> - Read partial sector</li>

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  53. <li><a href="pf/dwritep.html">disk_writep</a> - Write partial sector</li>

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  54. </ul>

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  59. <h3>Resources</h3>

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  60. <p>The Petit FatFs module is a free software and is opened for education, research and development. You can use, modify and/or redistribute it for personal, non-profit or commercial use without any restriction under your responsibility. For further information, refer to the application note.</p>

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  61. <ul>

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  62. <li><a href="http://elm-chan.org/fsw/ff/bd/"><em>FatFs User Forum</em></a></li>

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  63. <li><a href="pf/appnote.html">Petit FatFs module application note</a> <span class="mfd">Dec 14, 2009</span></li>

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  64. <li><a href="http://www.microsoft.com/whdc/system/platform/firmware/fatgen.mspx">FAT32 Specification by Microsoft</a> (The reference document on FAT file system)</li>

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  65. <li><a href="http://elm-chan.org/docs/mmc/mmc_e.html">How to Use MMC/SDC</a></li>

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  66. <li><a href="img/rwtest3.png">Benchmark 3</a> (ATtiny85/8MHz with MMC via USI)</li>

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  67. </ul>

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  68. </div>

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  71. <hr>

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  72. <p class="foot"><a href="../../fsw_e.html">Return</a></p>

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