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<div class="title">fat_table.c</div> </div>
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<a href="fat__table_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// FAT16/32 File IO Library</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// V2.6</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// Ultra-Embedded.com</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// Copyright 2003 - 2012</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">//</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// Email: admin@ultra-embedded.com</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">//</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">// License: GPL</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// If you would like a version with a more permissive license for use in</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// closed source commercial applications please contact me for details.</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">//</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">// This file is part of FAT File IO Library.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">//</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// FAT File IO Library is free software; you can redistribute it and/or modify</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// it under the terms of the GNU General Public License as published by</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment">// the Free Software Foundation; either version 2 of the License, or</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">// (at your option) any later version.</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">//</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// FAT File IO Library is distributed in the hope that it will be useful,</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">// GNU General Public License for more details.</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment">//</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment">// You should have received a copy of the GNU General Public License</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">// along with FAT File IO Library; if not, write to the Free Software</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#include <<a class="code" href="string_8h.html">string.h</a>></span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor">#include "<a class="code" href="fat__defs_8h.html">fat_defs.h</a>"</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#include "<a class="code" href="fat__access_8h.html">fat_access.h</a>"</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor">#include "<a class="code" href="fat__table_8h.html">fat_table.h</a>"</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  </div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor">#ifndef FAT_BUFFERS</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor"> #define FAT_BUFFERS 1</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  </div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="preprocessor">#ifndef FAT_BUFFER_SECTORS</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="preprocessor"> #define FAT_BUFFER_SECTORS 1</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  </div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor">#if FAT_BUFFERS < 1 || FAT_BUFFER_SECTORS < 1</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="preprocessor"> #error "FAT_BUFFERS & FAT_BUFFER_SECTORS must be at least 1"</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  </div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment">// FAT Sector Buffer</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"><a class="line" href="fat__table_8c.html#a0a6522450298f8a790c9f1d65f48127c"> 52</a></span> <span class="preprocessor">#define FAT32_GET_32BIT_WORD(pbuf, location) ( GET_32BIT_WORD(pbuf->ptr, location) )</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"><a class="line" href="fat__table_8c.html#abb5f187f6fb765eef1e56176c6c5b181"> 53</a></span> <span class="preprocessor">#define FAT32_SET_32BIT_WORD(pbuf, location, value) { SET_32BIT_WORD(pbuf->ptr, location, value); pbuf->dirty = 1; }</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"><a class="line" href="fat__table_8c.html#a9082df82fd33440e77f0562ad1aab170"> 54</a></span> <span class="preprocessor">#define FAT16_GET_16BIT_WORD(pbuf, location) ( GET_16BIT_WORD(pbuf->ptr, location) )</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"><a class="line" href="fat__table_8c.html#a27ec80884b91839c4bee7151a5e217cd"> 55</a></span> <span class="preprocessor">#define FAT16_SET_16BIT_WORD(pbuf, location, value) { SET_16BIT_WORD(pbuf->ptr, location, value); pbuf->dirty = 1; }</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  </div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment">// fatfs_fat_init:</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"><a class="line" href="fat__table_8h.html#acee4d83639e6fa1a228aec05618140e6"> 60</a></span> <span class="keywordtype">void</span> <a class="code" href="fat__table_8c.html#acee4d83639e6fa1a228aec05618140e6">fatfs_fat_init</a>(<span class="keyword">struct</span> <a class="code" href="structfatfs.html">fatfs</a> *<a class="code" href="structfs.html">fs</a>)</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> {</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  </div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="comment">// FAT buffer chain head</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <a class="code" href="structfs.html">fs</a>->fat_buffer_head = <a class="code" href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  </div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">for</span> (i=0;i<<a class="code" href="fat__opts_8h.html#aa9354e4947875cd05f1d02b6e1f0ae96">FAT_BUFFERS</a>;i++)</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  {</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="comment">// Initialise buffers to invalid</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <a class="code" href="structfs.html">fs</a>->fat_buffers[i].address = <a class="code" href="fat__defs_8h.html#a8dd000b545e9a127169fdbd82d418965">FAT32_INVALID_CLUSTER</a>;</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <a class="code" href="structfs.html">fs</a>->fat_buffers[i].dirty = 0;</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <a class="code" href="string_8h.html#ace4b911463887af5e748326323e99a23">memset</a>(<a class="code" href="structfs.html">fs</a>->fat_buffers[i].sector, 0x00, <span class="keyword">sizeof</span>(<a class="code" href="structfs.html">fs</a>->fat_buffers[i].sector));</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <a class="code" href="structfs.html">fs</a>->fat_buffers[i].ptr = <a class="code" href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  </div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="comment">// Add to head of queue</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <a class="code" href="structfs.html">fs</a>->fat_buffers[i].next = <a class="code" href="structfs.html">fs</a>->fat_buffer_head;</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <a class="code" href="structfs.html">fs</a>->fat_buffer_head = &<a class="code" href="structfs.html">fs</a>->fat_buffers[i];</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  }</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> }</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment">// fatfs_fat_writeback: Writeback 'dirty' FAT sectors to disk</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="keyword">static</span> <span class="keywordtype">int</span> fatfs_fat_writeback(<span class="keyword">struct</span> <a class="code" href="structfatfs.html">fatfs</a> *<a class="code" href="structfs.html">fs</a>, <span class="keyword">struct</span> <a class="code" href="structfat__buffer.html">fat_buffer</a> *pcur)</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> {</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">if</span> (pcur)</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  {</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="comment">// Writeback sector if changed</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">if</span> (pcur-><a class="code" href="structfat__buffer.html#a1679a1936a7f1862e0a13389f03f7270">dirty</a>)</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  {</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">if</span> (<a class="code" href="structfs.html">fs</a>->disk_io.write_media)</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  {</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> sectors = <a class="code" href="fat__opts_8h.html#a16d1dd1641be9f2d5b9bc7016d3e4558">FAT_BUFFER_SECTORS</a>;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> offset = pcur-><a class="code" href="structfat__buffer.html#aac81891a2e6cdeceeb0b875b1b5aaad6">address</a> - <a class="code" href="structfs.html">fs</a>->fat_begin_lba;</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  </div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="comment">// Limit to sectors used for the FAT</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">if</span> ((offset + <a class="code" href="fat__opts_8h.html#a16d1dd1641be9f2d5b9bc7016d3e4558">FAT_BUFFER_SECTORS</a>) <= <a class="code" href="structfs.html">fs</a>->fat_sectors)</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  sectors = <a class="code" href="fat__opts_8h.html#a16d1dd1641be9f2d5b9bc7016d3e4558">FAT_BUFFER_SECTORS</a>;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  sectors = <a class="code" href="structfs.html">fs</a>->fat_sectors - offset;</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  </div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">if</span> (!<a class="code" href="structfs.html">fs</a>->disk_io.write_media(pcur-><a class="code" href="structfat__buffer.html#aac81891a2e6cdeceeb0b875b1b5aaad6">address</a>, pcur-><a class="code" href="structfat__buffer.html#ad26f6eb3714e0ea2cdb08e22cb6d1ae1">sector</a>, sectors))</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  }</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  </div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  pcur-><a class="code" href="structfat__buffer.html#a1679a1936a7f1862e0a13389f03f7270">dirty</a> = 0;</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  }</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  </div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  }</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> }</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment">// fatfs_fat_read_sector: Read a FAT sector</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="keyword">static</span> <span class="keyword">struct </span><a class="code" href="structfat__buffer.html">fat_buffer</a> *fatfs_fat_read_sector(<span class="keyword">struct</span> <a class="code" href="structfatfs.html">fatfs</a> *<a class="code" href="structfs.html">fs</a>, <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> <a class="code" href="structfat__buffer.html#ad26f6eb3714e0ea2cdb08e22cb6d1ae1">sector</a>)</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> {</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keyword">struct </span><a class="code" href="structfat__buffer.html">fat_buffer</a> *last = <a class="code" href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keyword">struct </span><a class="code" href="structfat__buffer.html">fat_buffer</a> *pcur = <a class="code" href="structfs.html">fs</a>->fat_buffer_head;</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  </div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="comment">// Itterate through sector buffer list</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordflow">while</span> (pcur)</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  {</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="comment">// Sector within this buffer?</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">if</span> ((<a class="code" href="structfat__buffer.html#ad26f6eb3714e0ea2cdb08e22cb6d1ae1">sector</a> >= pcur-><a class="code" href="structfat__buffer.html#aac81891a2e6cdeceeb0b875b1b5aaad6">address</a>) && (<a class="code" href="structfat__buffer.html#ad26f6eb3714e0ea2cdb08e22cb6d1ae1">sector</a> < (pcur-><a class="code" href="structfat__buffer.html#aac81891a2e6cdeceeb0b875b1b5aaad6">address</a> + <a class="code" href="fat__opts_8h.html#a16d1dd1641be9f2d5b9bc7016d3e4558">FAT_BUFFER_SECTORS</a>)))</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  </div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="comment">// End of list?</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keywordflow">if</span> (pcur-><a class="code" href="structfat__buffer.html#a7bf0427e8229c466e093aad4563ce369">next</a> == <a class="code" href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>)</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  {</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="comment">// Remove buffer from list</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordflow">if</span> (last)</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  last-><a class="code" href="structfat__buffer.html#a7bf0427e8229c466e093aad4563ce369">next</a> = <a class="code" href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="comment">// We the first and last buffer in the chain?</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <a class="code" href="structfs.html">fs</a>->fat_buffer_head = <a class="code" href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  }</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  </div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  last = pcur;</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  pcur = pcur-><a class="code" href="structfat__buffer.html#a7bf0427e8229c466e093aad4563ce369">next</a>;</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  }</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  </div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="comment">// We found the sector already in FAT buffer chain</span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="keywordflow">if</span> (pcur)</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  {</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  pcur-><a class="code" href="structfat__buffer.html#acc02e408347f85e6c24db4574365e102">ptr</a> = (<a class="code" href="fat__types_8h.html#adde6aaee8457bee49c2a92621fe22b79">uint8</a> *)(pcur-><a class="code" href="structfat__buffer.html#ad26f6eb3714e0ea2cdb08e22cb6d1ae1">sector</a> + ((<a class="code" href="structfat__buffer.html#ad26f6eb3714e0ea2cdb08e22cb6d1ae1">sector</a> - pcur-><a class="code" href="structfat__buffer.html#aac81891a2e6cdeceeb0b875b1b5aaad6">address</a>) * <a class="code" href="fat__opts_8h.html#a873b78b38ef34edf6291274eb0708634">FAT_SECTOR_SIZE</a>));</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">return</span> pcur;</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  }</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  </div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="comment">// Else, we removed the last item from the list</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  pcur = last;</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  </div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="comment">// Add to start of sector buffer list (now newest sector)</span></div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  pcur-><a class="code" href="structfat__buffer.html#a7bf0427e8229c466e093aad4563ce369">next</a> = <a class="code" href="structfs.html">fs</a>->fat_buffer_head;</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <a class="code" href="structfs.html">fs</a>->fat_buffer_head = pcur;</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  </div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <span class="comment">// Writeback sector if changed</span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="keywordflow">if</span> (pcur-><a class="code" href="structfat__buffer.html#a1679a1936a7f1862e0a13389f03f7270">dirty</a>)</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keywordflow">if</span> (!fatfs_fat_writeback(<a class="code" href="structfs.html">fs</a>, pcur))</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  </div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="comment">// Address is now new sector</span></div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  pcur-><a class="code" href="structfat__buffer.html#aac81891a2e6cdeceeb0b875b1b5aaad6">address</a> = <a class="code" href="structfat__buffer.html#ad26f6eb3714e0ea2cdb08e22cb6d1ae1">sector</a>;</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  </div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="comment">// Read next sector</span></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keywordflow">if</span> (!<a class="code" href="structfs.html">fs</a>->disk_io.read_media(pcur-><a class="code" href="structfat__buffer.html#aac81891a2e6cdeceeb0b875b1b5aaad6">address</a>, pcur-><a class="code" href="structfat__buffer.html#ad26f6eb3714e0ea2cdb08e22cb6d1ae1">sector</a>, <a class="code" href="fat__opts_8h.html#a16d1dd1641be9f2d5b9bc7016d3e4558">FAT_BUFFER_SECTORS</a>))</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  {</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  <span class="comment">// Read failed, invalidate buffer address</span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  pcur-><a class="code" href="structfat__buffer.html#aac81891a2e6cdeceeb0b875b1b5aaad6">address</a> = <a class="code" href="fat__defs_8h.html#a8dd000b545e9a127169fdbd82d418965">FAT32_INVALID_CLUSTER</a>;</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keywordflow">return</span> <a class="code" href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  }</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  </div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  pcur-><a class="code" href="structfat__buffer.html#acc02e408347f85e6c24db4574365e102">ptr</a> = pcur-><a class="code" href="structfat__buffer.html#ad26f6eb3714e0ea2cdb08e22cb6d1ae1">sector</a>;</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="keywordflow">return</span> pcur;</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> }</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> <span class="comment">// fatfs_fat_purge: Purge 'dirty' FAT sectors to disk</span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00179"></a><span class="lineno"><a class="line" href="fat__table_8h.html#a4122bbba15645ebdeea241ef7bcb663e"> 179</a></span> <span class="keywordtype">int</span> <a class="code" href="fat__table_8c.html#a4122bbba15645ebdeea241ef7bcb663e">fatfs_fat_purge</a>(<span class="keyword">struct</span> <a class="code" href="structfatfs.html">fatfs</a> *<a class="code" href="structfs.html">fs</a>)</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> {</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keyword">struct </span><a class="code" href="structfat__buffer.html">fat_buffer</a> *pcur = <a class="code" href="structfs.html">fs</a>->fat_buffer_head;</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  </div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="comment">// Itterate through sector buffer list</span></div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <span class="keywordflow">while</span> (pcur)</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  {</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="comment">// Writeback sector if changed</span></div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="keywordflow">if</span> (pcur-><a class="code" href="structfat__buffer.html#a1679a1936a7f1862e0a13389f03f7270">dirty</a>)</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="keywordflow">if</span> (!fatfs_fat_writeback(<a class="code" href="structfs.html">fs</a>, pcur))</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  </div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  pcur = pcur-><a class="code" href="structfat__buffer.html#a7bf0427e8229c466e093aad4563ce369">next</a>;</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  }</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  </div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> }</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  </div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> <span class="comment">// General FAT Table Operations</span></div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  </div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> <span class="comment">// fatfs_find_next_cluster: Return cluster number of next cluster in chain by</span></div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> <span class="comment">// reading FAT table and traversing it. Return 0xffffffff for end of chain.</span></div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00205"></a><span class="lineno"><a class="line" href="fat__table_8h.html#af6297d64179e09d929493451ab68d6e6"> 205</a></span> <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> <a class="code" href="fat__table_8c.html#af6297d64179e09d929493451ab68d6e6">fatfs_find_next_cluster</a>(<span class="keyword">struct</span> <a class="code" href="structfatfs.html">fatfs</a> *<a class="code" href="structfs.html">fs</a>, <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> current_cluster)</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span> {</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> fat_sector_offset, position;</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> nextcluster;</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="keyword">struct </span><a class="code" href="structfat__buffer.html">fat_buffer</a> *<a class="code" href="structpbuf.html">pbuf</a>;</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  </div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="comment">// Why is '..' labelled with cluster 0 when it should be 2 ??</span></div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="keywordflow">if</span> (current_cluster == 0)</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  current_cluster = 2;</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  </div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="comment">// Find which sector of FAT table to read</span></div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="keywordflow">if</span> (<a class="code" href="structfs.html">fs</a>->fat_type == <a class="code" href="fat__access_8h.html#abd20c4673fcbadb1753696ba8353a13ba5ba99630da99c25c9e9efd7ed0bebf51">FAT_TYPE_16</a>)</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  fat_sector_offset = current_cluster / 256;</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  fat_sector_offset = current_cluster / 128;</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  </div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="comment">// Read FAT sector into buffer</span></div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  <a class="code" href="structpbuf.html">pbuf</a> = fatfs_fat_read_sector(<a class="code" href="structfs.html">fs</a>, <a class="code" href="structfs.html">fs</a>->fat_begin_lba+fat_sector_offset);</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="keywordflow">if</span> (!<a class="code" href="structpbuf.html">pbuf</a>)</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <span class="keywordflow">return</span> (<a class="code" href="fat__defs_8h.html#a6542eeb37905e8f378fb8f3e5e94d083">FAT32_LAST_CLUSTER</a>);</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  </div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <span class="keywordflow">if</span> (<a class="code" href="structfs.html">fs</a>->fat_type == <a class="code" href="fat__access_8h.html#abd20c4673fcbadb1753696ba8353a13ba5ba99630da99c25c9e9efd7ed0bebf51">FAT_TYPE_16</a>)</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  {</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <span class="comment">// Find 32 bit entry of current sector relating to cluster number</span></div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  position = (current_cluster - (fat_sector_offset * 256)) * 2;</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  </div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="comment">// Read Next Clusters value from Sector Buffer</span></div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  nextcluster = <a class="code" href="fat__table_8c.html#a9082df82fd33440e77f0562ad1aab170">FAT16_GET_16BIT_WORD</a>(<a class="code" href="structpbuf.html">pbuf</a>, (<a class="code" href="fat__types_8h.html#a05f6b0ae8f6a6e135b0e290c25fe0e4e">uint16</a>)position);</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  </div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  <span class="comment">// If end of chain found</span></div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <span class="keywordflow">if</span> (nextcluster >= 0xFFF8 && nextcluster <= 0xFFFF)</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <span class="keywordflow">return</span> (<a class="code" href="fat__defs_8h.html#a6542eeb37905e8f378fb8f3e5e94d083">FAT32_LAST_CLUSTER</a>);</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  }</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  {</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  <span class="comment">// Find 32 bit entry of current sector relating to cluster number</span></div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  position = (current_cluster - (fat_sector_offset * 128)) * 4;</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  </div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <span class="comment">// Read Next Clusters value from Sector Buffer</span></div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  nextcluster = <a class="code" href="fat__table_8c.html#a0a6522450298f8a790c9f1d65f48127c">FAT32_GET_32BIT_WORD</a>(<a class="code" href="structpbuf.html">pbuf</a>, (<a class="code" href="fat__types_8h.html#a05f6b0ae8f6a6e135b0e290c25fe0e4e">uint16</a>)position);</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  </div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <span class="comment">// Mask out MS 4 bits (its 28bit addressing)</span></div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  nextcluster = nextcluster & 0x0FFFFFFF;</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  </div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="comment">// If end of chain found</span></div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  <span class="keywordflow">if</span> (nextcluster >= 0x0FFFFFF8 && nextcluster <= 0x0FFFFFFF)</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  <span class="keywordflow">return</span> (<a class="code" href="fat__defs_8h.html#a6542eeb37905e8f378fb8f3e5e94d083">FAT32_LAST_CLUSTER</a>);</div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  }</div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  </div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  <span class="comment">// Else return next cluster</span></div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  <span class="keywordflow">return</span> (nextcluster);</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span> }</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> <span class="comment">// fatfs_set_fs_info_next_free_cluster: Write the next free cluster to the FSINFO table</span></div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00260"></a><span class="lineno"><a class="line" href="fat__table_8h.html#a41c8ddc94d8c036d0b62a67c021a0d71"> 260</a></span> <span class="keywordtype">void</span> <a class="code" href="fat__table_8c.html#a41c8ddc94d8c036d0b62a67c021a0d71">fatfs_set_fs_info_next_free_cluster</a>(<span class="keyword">struct</span> <a class="code" href="structfatfs.html">fatfs</a> *<a class="code" href="structfs.html">fs</a>, <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> newValue)</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span> {</div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="keywordflow">if</span> (<a class="code" href="structfs.html">fs</a>->fat_type == <a class="code" href="fat__access_8h.html#abd20c4673fcbadb1753696ba8353a13ba5ba99630da99c25c9e9efd7ed0bebf51">FAT_TYPE_16</a>)</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  ;</div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  {</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="comment">// Load sector to change it</span></div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="keyword">struct </span><a class="code" href="structfat__buffer.html">fat_buffer</a> *<a class="code" href="structpbuf.html">pbuf</a> = fatfs_fat_read_sector(<a class="code" href="structfs.html">fs</a>, <a class="code" href="structfs.html">fs</a>->lba_begin+<a class="code" href="structfs.html">fs</a>->fs_info_sector);</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  <span class="keywordflow">if</span> (!<a class="code" href="structpbuf.html">pbuf</a>)</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  return ;</div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  </div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  <span class="comment">// Change</span></div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <a class="code" href="fat__table_8c.html#abb5f187f6fb765eef1e56176c6c5b181">FAT32_SET_32BIT_WORD</a>(<a class="code" href="structpbuf.html">pbuf</a>, 492, newValue);</div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <a class="code" href="structfs.html">fs</a>->next_free_cluster = newValue;</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  </div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <span class="comment">// Write back FSINFO sector to disk</span></div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keywordflow">if</span> (<a class="code" href="structfs.html">fs</a>->disk_io.write_media)</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <a class="code" href="structfs.html">fs</a>->disk_io.write_media(<a class="code" href="structpbuf.html">pbuf</a>->address, <a class="code" href="structpbuf.html">pbuf</a>->sector, 1);</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  </div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="comment">// Invalidate cache entry</span></div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <a class="code" href="structpbuf.html">pbuf</a>->address = <a class="code" href="fat__defs_8h.html#a8dd000b545e9a127169fdbd82d418965">FAT32_INVALID_CLUSTER</a>;</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <a class="code" href="structpbuf.html">pbuf</a>->dirty = 0;</div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  }</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span> }</div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span> <span class="comment">// fatfs_find_blank_cluster: Find a free cluster entry by reading the FAT</span></div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span> <span class="preprocessor">#if FATFS_INC_WRITE_SUPPORT</span></div>
<div class="line"><a name="l00288"></a><span class="lineno"><a class="line" href="fat__table_8h.html#a595276233a4e5f4696cb6030ec54ed64"> 288</a></span> <span class="keywordtype">int</span> <a class="code" href="fat__table_8c.html#a595276233a4e5f4696cb6030ec54ed64">fatfs_find_blank_cluster</a>(<span class="keyword">struct</span> <a class="code" href="structfatfs.html">fatfs</a> *<a class="code" href="structfs.html">fs</a>, <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> start_cluster, <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> *free_cluster)</div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span> {</div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> fat_sector_offset, position;</div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> nextcluster;</div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> current_cluster = start_cluster;</div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  <span class="keyword">struct </span><a class="code" href="structfat__buffer.html">fat_buffer</a> *<a class="code" href="structpbuf.html">pbuf</a>;</div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  </div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  <span class="keywordflow">do</span></div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  {</div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  <span class="comment">// Find which sector of FAT table to read</span></div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  <span class="keywordflow">if</span> (<a class="code" href="structfs.html">fs</a>->fat_type == <a class="code" href="fat__access_8h.html#abd20c4673fcbadb1753696ba8353a13ba5ba99630da99c25c9e9efd7ed0bebf51">FAT_TYPE_16</a>)</div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  fat_sector_offset = current_cluster / 256;</div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  fat_sector_offset = current_cluster / 128;</div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  </div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  <span class="keywordflow">if</span> ( fat_sector_offset < fs->fat_sectors)</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  {</div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  <span class="comment">// Read FAT sector into buffer</span></div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  <a class="code" href="structpbuf.html">pbuf</a> = fatfs_fat_read_sector(<a class="code" href="structfs.html">fs</a>, <a class="code" href="structfs.html">fs</a>->fat_begin_lba+fat_sector_offset);</div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  <span class="keywordflow">if</span> (!<a class="code" href="structpbuf.html">pbuf</a>)</div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  </div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  <span class="keywordflow">if</span> (<a class="code" href="structfs.html">fs</a>->fat_type == <a class="code" href="fat__access_8h.html#abd20c4673fcbadb1753696ba8353a13ba5ba99630da99c25c9e9efd7ed0bebf51">FAT_TYPE_16</a>)</div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  {</div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  <span class="comment">// Find 32 bit entry of current sector relating to cluster number</span></div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  position = (current_cluster - (fat_sector_offset * 256)) * 2;</div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  </div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <span class="comment">// Read Next Clusters value from Sector Buffer</span></div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  nextcluster = <a class="code" href="fat__table_8c.html#a9082df82fd33440e77f0562ad1aab170">FAT16_GET_16BIT_WORD</a>(<a class="code" href="structpbuf.html">pbuf</a>, (<a class="code" href="fat__types_8h.html#a05f6b0ae8f6a6e135b0e290c25fe0e4e">uint16</a>)position);</div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  }</div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  {</div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  <span class="comment">// Find 32 bit entry of current sector relating to cluster number</span></div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  position = (current_cluster - (fat_sector_offset * 128)) * 4;</div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  </div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  <span class="comment">// Read Next Clusters value from Sector Buffer</span></div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  nextcluster = <a class="code" href="fat__table_8c.html#a0a6522450298f8a790c9f1d65f48127c">FAT32_GET_32BIT_WORD</a>(<a class="code" href="structpbuf.html">pbuf</a>, (<a class="code" href="fat__types_8h.html#a05f6b0ae8f6a6e135b0e290c25fe0e4e">uint16</a>)position);</div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  </div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  <span class="comment">// Mask out MS 4 bits (its 28bit addressing)</span></div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  nextcluster = nextcluster & 0x0FFFFFFF;</div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  }</div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  </div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  <span class="keywordflow">if</span> (nextcluster !=0 )</div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  current_cluster++;</div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  }</div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  <span class="comment">// Otherwise, run out of FAT sectors to check...</span></div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  }</div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  <span class="keywordflow">while</span> (nextcluster != 0x0);</div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  </div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  <span class="comment">// Found blank entry</span></div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  *free_cluster = current_cluster;</div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span> }</div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span> <span class="comment">// fatfs_fat_set_cluster: Set a cluster link in the chain. NOTE: Immediate</span></div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span> <span class="comment">// write (slow).</span></div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span> <span class="preprocessor">#if FATFS_INC_WRITE_SUPPORT</span></div>
<div class="line"><a name="l00349"></a><span class="lineno"><a class="line" href="fat__table_8h.html#a9869304acfd1d264b8cebe1561dfe60a"> 349</a></span> <span class="keywordtype">int</span> <a class="code" href="fat__table_8c.html#a9869304acfd1d264b8cebe1561dfe60a">fatfs_fat_set_cluster</a>(<span class="keyword">struct</span> <a class="code" href="structfatfs.html">fatfs</a> *<a class="code" href="structfs.html">fs</a>, <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> cluster, <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> next_cluster)</div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span> {</div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  <span class="keyword">struct </span><a class="code" href="structfat__buffer.html">fat_buffer</a> *<a class="code" href="structpbuf.html">pbuf</a>;</div>
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> fat_sector_offset, position;</div>
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  </div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  <span class="comment">// Find which sector of FAT table to read</span></div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  <span class="keywordflow">if</span> (<a class="code" href="structfs.html">fs</a>->fat_type == <a class="code" href="fat__access_8h.html#abd20c4673fcbadb1753696ba8353a13ba5ba99630da99c25c9e9efd7ed0bebf51">FAT_TYPE_16</a>)</div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  fat_sector_offset = cluster / 256;</div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  fat_sector_offset = cluster / 128;</div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  </div>
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  <span class="comment">// Read FAT sector into buffer</span></div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  <a class="code" href="structpbuf.html">pbuf</a> = fatfs_fat_read_sector(<a class="code" href="structfs.html">fs</a>, <a class="code" href="structfs.html">fs</a>->fat_begin_lba+fat_sector_offset);</div>
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  <span class="keywordflow">if</span> (!<a class="code" href="structpbuf.html">pbuf</a>)</div>
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span>  </div>
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  <span class="keywordflow">if</span> (<a class="code" href="structfs.html">fs</a>->fat_type == <a class="code" href="fat__access_8h.html#abd20c4673fcbadb1753696ba8353a13ba5ba99630da99c25c9e9efd7ed0bebf51">FAT_TYPE_16</a>)</div>
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  {</div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  <span class="comment">// Find 16 bit entry of current sector relating to cluster number</span></div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  position = (cluster - (fat_sector_offset * 256)) * 2;</div>
<div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  </div>
<div class="line"><a name="l00370"></a><span class="lineno"> 370</span>  <span class="comment">// Write Next Clusters value to Sector Buffer</span></div>
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  <a class="code" href="fat__table_8c.html#a27ec80884b91839c4bee7151a5e217cd">FAT16_SET_16BIT_WORD</a>(<a class="code" href="structpbuf.html">pbuf</a>, (<a class="code" href="fat__types_8h.html#a05f6b0ae8f6a6e135b0e290c25fe0e4e">uint16</a>)position, ((<a class="code" href="fat__types_8h.html#a05f6b0ae8f6a6e135b0e290c25fe0e4e">uint16</a>)next_cluster));</div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  }</div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span>  {</div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  <span class="comment">// Find 32 bit entry of current sector relating to cluster number</span></div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  position = (cluster - (fat_sector_offset * 128)) * 4;</div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  </div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  <span class="comment">// Write Next Clusters value to Sector Buffer</span></div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  <a class="code" href="fat__table_8c.html#abb5f187f6fb765eef1e56176c6c5b181">FAT32_SET_32BIT_WORD</a>(<a class="code" href="structpbuf.html">pbuf</a>, (<a class="code" href="fat__types_8h.html#a05f6b0ae8f6a6e135b0e290c25fe0e4e">uint16</a>)position, next_cluster);</div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  }</div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  </div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span> }</div>
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span> <span class="comment">// fatfs_free_cluster_chain: Follow a chain marking each element as free</span></div>
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span> <span class="preprocessor">#if FATFS_INC_WRITE_SUPPORT</span></div>
<div class="line"><a name="l00389"></a><span class="lineno"><a class="line" href="fat__table_8h.html#a7a329446088ccb4d6348f05fcd848ee4"> 389</a></span> <span class="keywordtype">int</span> <a class="code" href="fat__table_8c.html#a7a329446088ccb4d6348f05fcd848ee4">fatfs_free_cluster_chain</a>(<span class="keyword">struct</span> <a class="code" href="structfatfs.html">fatfs</a> *<a class="code" href="structfs.html">fs</a>, <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> start_cluster)</div>
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span> {</div>
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> last_cluster;</div>
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> next_cluster = start_cluster;</div>
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span>  </div>
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  <span class="comment">// Loop until end of chain</span></div>
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  <span class="keywordflow">while</span> ( (next_cluster != <a class="code" href="fat__defs_8h.html#a6542eeb37905e8f378fb8f3e5e94d083">FAT32_LAST_CLUSTER</a>) && (next_cluster != 0x00000000) )</div>
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  {</div>
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  last_cluster = next_cluster;</div>
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  </div>
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  <span class="comment">// Find next link</span></div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  next_cluster = <a class="code" href="fat__table_8c.html#af6297d64179e09d929493451ab68d6e6">fatfs_find_next_cluster</a>(<a class="code" href="structfs.html">fs</a>, next_cluster);</div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  </div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  <span class="comment">// Clear last link</span></div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  <a class="code" href="fat__table_8c.html#a9869304acfd1d264b8cebe1561dfe60a">fatfs_fat_set_cluster</a>(<a class="code" href="structfs.html">fs</a>, last_cluster, 0x00000000);</div>
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  }</div>
<div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  </div>
<div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span> }</div>
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span> <span class="comment">// fatfs_fat_add_cluster_to_chain: Follow a chain marking and then add a new entry</span></div>
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span> <span class="comment">// to the current tail.</span></div>
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span> <span class="preprocessor">#if FATFS_INC_WRITE_SUPPORT</span></div>
<div class="line"><a name="l00414"></a><span class="lineno"><a class="line" href="fat__table_8h.html#af55ecc38d5888e53106fd26fd6805d5c"> 414</a></span> <span class="keywordtype">int</span> <a class="code" href="fat__table_8c.html#af55ecc38d5888e53106fd26fd6805d5c">fatfs_fat_add_cluster_to_chain</a>(<span class="keyword">struct</span> <a class="code" href="structfatfs.html">fatfs</a> *<a class="code" href="structfs.html">fs</a>, <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> start_cluster, <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> newEntry)</div>
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span> {</div>
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span>  <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> last_cluster = <a class="code" href="fat__defs_8h.html#a6542eeb37905e8f378fb8f3e5e94d083">FAT32_LAST_CLUSTER</a>;</div>
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> next_cluster = start_cluster;</div>
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  </div>
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  <span class="keywordflow">if</span> (start_cluster == <a class="code" href="fat__defs_8h.html#a6542eeb37905e8f378fb8f3e5e94d083">FAT32_LAST_CLUSTER</a>)</div>
<div class="line"><a name="l00420"></a><span class="lineno"> 420</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  </div>
<div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  <span class="comment">// Loop until end of chain</span></div>
<div class="line"><a name="l00423"></a><span class="lineno"> 423</span>  <span class="keywordflow">while</span> ( next_cluster != <a class="code" href="fat__defs_8h.html#a6542eeb37905e8f378fb8f3e5e94d083">FAT32_LAST_CLUSTER</a> )</div>
<div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  {</div>
<div class="line"><a name="l00425"></a><span class="lineno"> 425</span>  last_cluster = next_cluster;</div>
<div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  </div>
<div class="line"><a name="l00427"></a><span class="lineno"> 427</span>  <span class="comment">// Find next link</span></div>
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  next_cluster = <a class="code" href="fat__table_8c.html#af6297d64179e09d929493451ab68d6e6">fatfs_find_next_cluster</a>(<a class="code" href="structfs.html">fs</a>, next_cluster);</div>
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  <span class="keywordflow">if</span> (!next_cluster)</div>
<div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  }</div>
<div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  </div>
<div class="line"><a name="l00433"></a><span class="lineno"> 433</span>  <span class="comment">// Add link in for new cluster</span></div>
<div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  <a class="code" href="fat__table_8c.html#a9869304acfd1d264b8cebe1561dfe60a">fatfs_fat_set_cluster</a>(<a class="code" href="structfs.html">fs</a>, last_cluster, newEntry);</div>
<div class="line"><a name="l00435"></a><span class="lineno"> 435</span>  </div>
<div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  <span class="comment">// Mark new cluster as end of chain</span></div>
<div class="line"><a name="l00437"></a><span class="lineno"> 437</span>  <a class="code" href="fat__table_8c.html#a9869304acfd1d264b8cebe1561dfe60a">fatfs_fat_set_cluster</a>(<a class="code" href="structfs.html">fs</a>, newEntry, <a class="code" href="fat__defs_8h.html#a6542eeb37905e8f378fb8f3e5e94d083">FAT32_LAST_CLUSTER</a>);</div>
<div class="line"><a name="l00438"></a><span class="lineno"> 438</span>  </div>
<div class="line"><a name="l00439"></a><span class="lineno"> 439</span>  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00440"></a><span class="lineno"> 440</span> }</div>
<div class="line"><a name="l00441"></a><span class="lineno"> 441</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00442"></a><span class="lineno"> 442</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00443"></a><span class="lineno"> 443</span> <span class="comment">// fatfs_count_free_clusters:</span></div>
<div class="line"><a name="l00444"></a><span class="lineno"> 444</span> <span class="comment">//-----------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00445"></a><span class="lineno"><a class="line" href="fat__table_8h.html#aa75d9d34a1735e3691f800a075966018"> 445</a></span> <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> <a class="code" href="fat__table_8c.html#aa75d9d34a1735e3691f800a075966018">fatfs_count_free_clusters</a>(<span class="keyword">struct</span> <a class="code" href="structfatfs.html">fatfs</a> *<a class="code" href="structfs.html">fs</a>)</div>
<div class="line"><a name="l00446"></a><span class="lineno"> 446</span> {</div>
<div class="line"><a name="l00447"></a><span class="lineno"> 447</span>  <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> i,j;</div>
<div class="line"><a name="l00448"></a><span class="lineno"> 448</span>  <a class="code" href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a> count = 0;</div>
<div class="line"><a name="l00449"></a><span class="lineno"> 449</span>  <span class="keyword">struct </span><a class="code" href="structfat__buffer.html">fat_buffer</a> *<a class="code" href="structpbuf.html">pbuf</a>;</div>
<div class="line"><a name="l00450"></a><span class="lineno"> 450</span>  </div>
<div class="line"><a name="l00451"></a><span class="lineno"> 451</span>  <span class="keywordflow">for</span> (i = 0; i < <a class="code" href="structfs.html">fs</a>->fat_sectors; i++)</div>
<div class="line"><a name="l00452"></a><span class="lineno"> 452</span>  {</div>
<div class="line"><a name="l00453"></a><span class="lineno"> 453</span>  <span class="comment">// Read FAT sector into buffer</span></div>
<div class="line"><a name="l00454"></a><span class="lineno"> 454</span>  <a class="code" href="structpbuf.html">pbuf</a> = fatfs_fat_read_sector(<a class="code" href="structfs.html">fs</a>, <a class="code" href="structfs.html">fs</a>->fat_begin_lba + i);</div>
<div class="line"><a name="l00455"></a><span class="lineno"> 455</span>  <span class="keywordflow">if</span> (!<a class="code" href="structpbuf.html">pbuf</a>)</div>
<div class="line"><a name="l00456"></a><span class="lineno"> 456</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00457"></a><span class="lineno"> 457</span>  </div>
<div class="line"><a name="l00458"></a><span class="lineno"> 458</span>  <span class="keywordflow">for</span> (j = 0; j < <a class="code" href="fat__opts_8h.html#a873b78b38ef34edf6291274eb0708634">FAT_SECTOR_SIZE</a>; )</div>
<div class="line"><a name="l00459"></a><span class="lineno"> 459</span>  {</div>
<div class="line"><a name="l00460"></a><span class="lineno"> 460</span>  <span class="keywordflow">if</span> (<a class="code" href="structfs.html">fs</a>->fat_type == <a class="code" href="fat__access_8h.html#abd20c4673fcbadb1753696ba8353a13ba5ba99630da99c25c9e9efd7ed0bebf51">FAT_TYPE_16</a>)</div>
<div class="line"><a name="l00461"></a><span class="lineno"> 461</span>  {</div>
<div class="line"><a name="l00462"></a><span class="lineno"> 462</span>  <span class="keywordflow">if</span> (<a class="code" href="fat__table_8c.html#a9082df82fd33440e77f0562ad1aab170">FAT16_GET_16BIT_WORD</a>(<a class="code" href="structpbuf.html">pbuf</a>, (<a class="code" href="fat__types_8h.html#a05f6b0ae8f6a6e135b0e290c25fe0e4e">uint16</a>)j) == 0)</div>
<div class="line"><a name="l00463"></a><span class="lineno"> 463</span>  count++;</div>
<div class="line"><a name="l00464"></a><span class="lineno"> 464</span>  </div>
<div class="line"><a name="l00465"></a><span class="lineno"> 465</span>  j += 2;</div>
<div class="line"><a name="l00466"></a><span class="lineno"> 466</span>  }</div>
<div class="line"><a name="l00467"></a><span class="lineno"> 467</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00468"></a><span class="lineno"> 468</span>  {</div>
<div class="line"><a name="l00469"></a><span class="lineno"> 469</span>  <span class="keywordflow">if</span> (<a class="code" href="fat__table_8c.html#a0a6522450298f8a790c9f1d65f48127c">FAT32_GET_32BIT_WORD</a>(<a class="code" href="structpbuf.html">pbuf</a>, (<a class="code" href="fat__types_8h.html#a05f6b0ae8f6a6e135b0e290c25fe0e4e">uint16</a>)j) == 0)</div>
<div class="line"><a name="l00470"></a><span class="lineno"> 470</span>  count++;</div>
<div class="line"><a name="l00471"></a><span class="lineno"> 471</span>  </div>
<div class="line"><a name="l00472"></a><span class="lineno"> 472</span>  j += 4;</div>
<div class="line"><a name="l00473"></a><span class="lineno"> 473</span>  }</div>
<div class="line"><a name="l00474"></a><span class="lineno"> 474</span>  }</div>
<div class="line"><a name="l00475"></a><span class="lineno"> 475</span>  }</div>
<div class="line"><a name="l00476"></a><span class="lineno"> 476</span>  </div>
<div class="line"><a name="l00477"></a><span class="lineno"> 477</span>  <span class="keywordflow">return</span> count;</div>
<div class="line"><a name="l00478"></a><span class="lineno"> 478</span> }</div>
</div><!-- fragment --></div><!-- contents -->
</div><!-- doc-content -->
<div class="ttc" id="afat__table_8c_html_af55ecc38d5888e53106fd26fd6805d5c"><div class="ttname"><a href="fat__table_8c.html#af55ecc38d5888e53106fd26fd6805d5c">fatfs_fat_add_cluster_to_chain</a></div><div class="ttdeci">int fatfs_fat_add_cluster_to_chain(struct fatfs *fs, uint32 start_cluster, uint32 newEntry)</div><div class="ttdef"><b>Definition:</b> <a href="fat__table_8c_source.html#l00414">fat_table.c:414</a></div></div>
<div class="ttc" id="astructfat__buffer_html"><div class="ttname"><a href="structfat__buffer.html">fat_buffer</a></div><div class="ttdef"><b>Definition:</b> <a href="fat__access_8h_source.html#l00040">fat_access.h:40</a></div></div>
<div class="ttc" id="afat__access_8h_html"><div class="ttname"><a href="fat__access_8h.html">fat_access.h</a></div></div>
<div class="ttc" id="afat__table_8h_html"><div class="ttname"><a href="fat__table_8h.html">fat_table.h</a></div></div>
<div class="ttc" id="afat__table_8c_html_abb5f187f6fb765eef1e56176c6c5b181"><div class="ttname"><a href="fat__table_8c.html#abb5f187f6fb765eef1e56176c6c5b181">FAT32_SET_32BIT_WORD</a></div><div class="ttdeci">#define FAT32_SET_32BIT_WORD(pbuf, location, value)</div><div class="ttdef"><b>Definition:</b> <a href="fat__table_8c_source.html#l00053">fat_table.c:53</a></div></div>
<div class="ttc" id="afat__types_8h_html_adde6aaee8457bee49c2a92621fe22b79"><div class="ttname"><a href="fat__types_8h.html#adde6aaee8457bee49c2a92621fe22b79">uint8</a></div><div class="ttdeci">unsigned char uint8</div><div class="ttdef"><b>Definition:</b> <a href="fat__types_8h_source.html#l00015">fat_types.h:15</a></div></div>
<div class="ttc" id="afat__table_8c_html_a0a6522450298f8a790c9f1d65f48127c"><div class="ttname"><a href="fat__table_8c.html#a0a6522450298f8a790c9f1d65f48127c">FAT32_GET_32BIT_WORD</a></div><div class="ttdeci">#define FAT32_GET_32BIT_WORD(pbuf, location)</div><div class="ttdef"><b>Definition:</b> <a href="fat__table_8c_source.html#l00052">fat_table.c:52</a></div></div>
<div class="ttc" id="afat__defs_8h_html_a6542eeb37905e8f378fb8f3e5e94d083"><div class="ttname"><a href="fat__defs_8h.html#a6542eeb37905e8f378fb8f3e5e94d083">FAT32_LAST_CLUSTER</a></div><div class="ttdeci">#define FAT32_LAST_CLUSTER</div><div class="ttdef"><b>Definition:</b> <a href="fat__defs_8h_source.html#l00108">fat_defs.h:108</a></div></div>
<div class="ttc" id="astring_8h_html"><div class="ttname"><a href="string_8h.html">string.h</a></div></div>
<div class="ttc" id="astructfat__buffer_html_a1679a1936a7f1862e0a13389f03f7270"><div class="ttname"><a href="structfat__buffer.html#a1679a1936a7f1862e0a13389f03f7270">fat_buffer::dirty</a></div><div class="ttdeci">int dirty</div><div class="ttdef"><b>Definition:</b> <a href="fat__access_8h_source.html#l00044">fat_access.h:44</a></div></div>
<div class="ttc" id="afat__table_8c_html_af6297d64179e09d929493451ab68d6e6"><div class="ttname"><a href="fat__table_8c.html#af6297d64179e09d929493451ab68d6e6">fatfs_find_next_cluster</a></div><div class="ttdeci">uint32 fatfs_find_next_cluster(struct fatfs *fs, uint32 current_cluster)</div><div class="ttdef"><b>Definition:</b> <a href="fat__table_8c_source.html#l00205">fat_table.c:205</a></div></div>
<div class="ttc" id="afat__table_8c_html_a41c8ddc94d8c036d0b62a67c021a0d71"><div class="ttname"><a href="fat__table_8c.html#a41c8ddc94d8c036d0b62a67c021a0d71">fatfs_set_fs_info_next_free_cluster</a></div><div class="ttdeci">void fatfs_set_fs_info_next_free_cluster(struct fatfs *fs, uint32 newValue)</div><div class="ttdef"><b>Definition:</b> <a href="fat__table_8c_source.html#l00260">fat_table.c:260</a></div></div>
<div class="ttc" id="afat__table_8c_html_a27ec80884b91839c4bee7151a5e217cd"><div class="ttname"><a href="fat__table_8c.html#a27ec80884b91839c4bee7151a5e217cd">FAT16_SET_16BIT_WORD</a></div><div class="ttdeci">#define FAT16_SET_16BIT_WORD(pbuf, location, value)</div><div class="ttdef"><b>Definition:</b> <a href="fat__table_8c_source.html#l00055">fat_table.c:55</a></div></div>
<div class="ttc" id="afat__defs_8h_html"><div class="ttname"><a href="fat__defs_8h.html">fat_defs.h</a></div></div>
<div class="ttc" id="afat__table_8c_html_a595276233a4e5f4696cb6030ec54ed64"><div class="ttname"><a href="fat__table_8c.html#a595276233a4e5f4696cb6030ec54ed64">fatfs_find_blank_cluster</a></div><div class="ttdeci">int fatfs_find_blank_cluster(struct fatfs *fs, uint32 start_cluster, uint32 *free_cluster)</div><div class="ttdef"><b>Definition:</b> <a href="fat__table_8c_source.html#l00288">fat_table.c:288</a></div></div>
<div class="ttc" id="astructfs_html"><div class="ttname"><a href="structfs.html">fs</a></div><div class="ttdef"><b>Definition:</b> <a href="ufs_2ffs_2fs_8h_source.html#l00260">fs.h:260</a></div></div>
<div class="ttc" id="afat__opts_8h_html_a873b78b38ef34edf6291274eb0708634"><div class="ttname"><a href="fat__opts_8h.html#a873b78b38ef34edf6291274eb0708634">FAT_SECTOR_SIZE</a></div><div class="ttdeci">#define FAT_SECTOR_SIZE</div><div class="ttdef"><b>Definition:</b> <a href="fat__opts_8h_source.html#l00070">fat_opts.h:70</a></div></div>
<div class="ttc" id="afat__table_8c_html_a7a329446088ccb4d6348f05fcd848ee4"><div class="ttname"><a href="fat__table_8c.html#a7a329446088ccb4d6348f05fcd848ee4">fatfs_free_cluster_chain</a></div><div class="ttdeci">int fatfs_free_cluster_chain(struct fatfs *fs, uint32 start_cluster)</div><div class="ttdef"><b>Definition:</b> <a href="fat__table_8c_source.html#l00389">fat_table.c:389</a></div></div>
<div class="ttc" id="afat__opts_8h_html_aa9354e4947875cd05f1d02b6e1f0ae96"><div class="ttname"><a href="fat__opts_8h.html#aa9354e4947875cd05f1d02b6e1f0ae96">FAT_BUFFERS</a></div><div class="ttdeci">#define FAT_BUFFERS</div><div class="ttdef"><b>Definition:</b> <a href="fat__opts_8h_source.html#l00035">fat_opts.h:35</a></div></div>
<div class="ttc" id="afat__defs_8h_html_a8dd000b545e9a127169fdbd82d418965"><div class="ttname"><a href="fat__defs_8h.html#a8dd000b545e9a127169fdbd82d418965">FAT32_INVALID_CLUSTER</a></div><div class="ttdeci">#define FAT32_INVALID_CLUSTER</div><div class="ttdef"><b>Definition:</b> <a href="fat__defs_8h_source.html#l00109">fat_defs.h:109</a></div></div>
<div class="ttc" id="afat__table_8c_html_aa75d9d34a1735e3691f800a075966018"><div class="ttname"><a href="fat__table_8c.html#aa75d9d34a1735e3691f800a075966018">fatfs_count_free_clusters</a></div><div class="ttdeci">uint32 fatfs_count_free_clusters(struct fatfs *fs)</div><div class="ttdef"><b>Definition:</b> <a href="fat__table_8c_source.html#l00445">fat_table.c:445</a></div></div>
<div class="ttc" id="afat__table_8c_html_a9082df82fd33440e77f0562ad1aab170"><div class="ttname"><a href="fat__table_8c.html#a9082df82fd33440e77f0562ad1aab170">FAT16_GET_16BIT_WORD</a></div><div class="ttdeci">#define FAT16_GET_16BIT_WORD(pbuf, location)</div><div class="ttdef"><b>Definition:</b> <a href="fat__table_8c_source.html#l00054">fat_table.c:54</a></div></div>
<div class="ttc" id="astring_8h_html_ace4b911463887af5e748326323e99a23"><div class="ttname"><a href="string_8h.html#ace4b911463887af5e748326323e99a23">memset</a></div><div class="ttdeci">void * memset(void *dst, int c, size_t length)</div></div>
<div class="ttc" id="afat__types_8h_html_a05f6b0ae8f6a6e135b0e290c25fe0e4e"><div class="ttname"><a href="fat__types_8h.html#a05f6b0ae8f6a6e135b0e290c25fe0e4e">uint16</a></div><div class="ttdeci">unsigned short uint16</div><div class="ttdef"><b>Definition:</b> <a href="fat__types_8h_source.html#l00016">fat_types.h:16</a></div></div>
<div class="ttc" id="afat__opts_8h_html_a16d1dd1641be9f2d5b9bc7016d3e4558"><div class="ttname"><a href="fat__opts_8h.html#a16d1dd1641be9f2d5b9bc7016d3e4558">FAT_BUFFER_SECTORS</a></div><div class="ttdeci">#define FAT_BUFFER_SECTORS</div><div class="ttdef"><b>Definition:</b> <a href="fat__opts_8h_source.html#l00029">fat_opts.h:29</a></div></div>
<div class="ttc" id="astructfat__buffer_html_ad26f6eb3714e0ea2cdb08e22cb6d1ae1"><div class="ttname"><a href="structfat__buffer.html#ad26f6eb3714e0ea2cdb08e22cb6d1ae1">fat_buffer::sector</a></div><div class="ttdeci">uint8 sector[512 *1]</div><div class="ttdef"><b>Definition:</b> <a href="fat__access_8h_source.html#l00042">fat_access.h:42</a></div></div>
<div class="ttc" id="afat__table_8c_html_a9869304acfd1d264b8cebe1561dfe60a"><div class="ttname"><a href="fat__table_8c.html#a9869304acfd1d264b8cebe1561dfe60a">fatfs_fat_set_cluster</a></div><div class="ttdeci">int fatfs_fat_set_cluster(struct fatfs *fs, uint32 cluster, uint32 next_cluster)</div><div class="ttdef"><b>Definition:</b> <a href="fat__table_8c_source.html#l00349">fat_table.c:349</a></div></div>
<div class="ttc" id="afat__table_8c_html_acee4d83639e6fa1a228aec05618140e6"><div class="ttname"><a href="fat__table_8c.html#acee4d83639e6fa1a228aec05618140e6">fatfs_fat_init</a></div><div class="ttdeci">void fatfs_fat_init(struct fatfs *fs)</div><div class="ttdef"><b>Definition:</b> <a href="fat__table_8c_source.html#l00060">fat_table.c:60</a></div></div>
<div class="ttc" id="afat__types_8h_html_a4b435a49c74bb91f284f075e63416cb6"><div class="ttname"><a href="fat__types_8h.html#a4b435a49c74bb91f284f075e63416cb6">uint32</a></div><div class="ttdeci">unsigned long uint32</div><div class="ttdef"><b>Definition:</b> <a href="fat__types_8h_source.html#l00023">fat_types.h:23</a></div></div>
<div class="ttc" id="astructfat__buffer_html_a7bf0427e8229c466e093aad4563ce369"><div class="ttname"><a href="structfat__buffer.html#a7bf0427e8229c466e093aad4563ce369">fat_buffer::next</a></div><div class="ttdeci">struct fat_buffer * next</div><div class="ttdef"><b>Definition:</b> <a href="fat__access_8h_source.html#l00048">fat_access.h:48</a></div></div>
<div class="ttc" id="afat__table_8c_html_a4122bbba15645ebdeea241ef7bcb663e"><div class="ttname"><a href="fat__table_8c.html#a4122bbba15645ebdeea241ef7bcb663e">fatfs_fat_purge</a></div><div class="ttdeci">int fatfs_fat_purge(struct fatfs *fs)</div><div class="ttdef"><b>Definition:</b> <a href="fat__table_8c_source.html#l00179">fat_table.c:179</a></div></div>
<div class="ttc" id="astructfat__buffer_html_acc02e408347f85e6c24db4574365e102"><div class="ttname"><a href="structfat__buffer.html#acc02e408347f85e6c24db4574365e102">fat_buffer::ptr</a></div><div class="ttdeci">uint8 * ptr</div><div class="ttdef"><b>Definition:</b> <a href="fat__access_8h_source.html#l00045">fat_access.h:45</a></div></div>
<div class="ttc" id="astructpbuf_html"><div class="ttname"><a href="structpbuf.html">pbuf</a></div><div class="ttdef"><b>Definition:</b> <a href="pbuf_8h_source.html#l00142">pbuf.h:142</a></div></div>
<div class="ttc" id="afat__access_8h_html_abd20c4673fcbadb1753696ba8353a13ba5ba99630da99c25c9e9efd7ed0bebf51"><div class="ttname"><a href="fat__access_8h.html#abd20c4673fcbadb1753696ba8353a13ba5ba99630da99c25c9e9efd7ed0bebf51">FAT_TYPE_16</a></div><div class="ttdef"><b>Definition:</b> <a href="fat__access_8h_source.html#l00053">fat_access.h:53</a></div></div>
<div class="ttc" id="astructfat__buffer_html_aac81891a2e6cdeceeb0b875b1b5aaad6"><div class="ttname"><a href="structfat__buffer.html#aac81891a2e6cdeceeb0b875b1b5aaad6">fat_buffer::address</a></div><div class="ttdeci">uint32 address</div><div class="ttdef"><b>Definition:</b> <a href="fat__access_8h_source.html#l00043">fat_access.h:43</a></div></div>
<div class="ttc" id="astructfatfs_html"><div class="ttname"><a href="structfatfs.html">fatfs</a></div><div class="ttdef"><b>Definition:</b> <a href="fat__access_8h_source.html#l00057">fat_access.h:57</a></div></div>
<div class="ttc" id="afat__string_8h_html_a070d2ce7b6bb7e5c05602aa8c308d0c4"><div class="ttname"><a href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a></div><div class="ttdeci">#define NULL</div><div class="ttdef"><b>Definition:</b> <a href="fat__string_8h_source.html#l00017">fat_string.h:17</a></div></div>
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