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<a name="l00105"></a>00105 <a class="code" href="struct__FATFS.html">FATFS</a> *fs = FatFs;<a name="l00106"></a>00106 <a name="l00107"></a>00107 <a name="l00108"></a>00108 fs-><a class="code" href="struct__FATFS.html#14c3cb7044924714bf3c7cc19b7da45e">winflag</a> = 1;<a name="l00109"></a>00109 <span class="keywordflow">if</span> (!move_window(0)) <span class="keywordflow">return</span> FR_RW_ERROR;<a name="l00110"></a>00110 <span class="preprocessor">#if _USE_FSINFO</span><a name="l00111"></a>00111 <span class="preprocessor"></span> <span class="keywordflow">if</span> (fs-><a class="code" href="struct__FATFS.html#91bea3661c2ffe4f65143c163493b995">fs_type</a> == FS_FAT32 && fs->fsi_flag) { <span class="comment">/* Update FSInfo sector if needed */</span><a name="l00112"></a>00112 fs-><a class="code" href="struct__FATFS.html#4d7990897697ab6b380e1036672d40a2">winsect</a> = 0;<a name="l00113"></a>00113 memset(fs-><a class="code" href="struct__FATFS.html#32c85fa1d26f37661c21f5a1afaa2c08">win</a>, 0, 512);<a name="l00114"></a>00114 ST_WORD(&fs-><a class="code" href="struct__FATFS.html#32c85fa1d26f37661c21f5a1afaa2c08">win</a>[BS_55AA], 0xAA55);<a name="l00115"></a>00115 ST_DWORD(&fs-><a class="code" href="struct__FATFS.html#32c85fa1d26f37661c21f5a1afaa2c08">win</a>[FSI_LeadSig], 0x41615252);<a name="l00116"></a>00116 ST_DWORD(&fs-><a class="code" href="struct__FATFS.html#32c85fa1d26f37661c21f5a1afaa2c08">win</a>[FSI_StrucSig], 0x61417272);<a name="l00117"></a>00117 ST_DWORD(&fs-><a class="code" href="struct__FATFS.html#32c85fa1d26f37661c21f5a1afaa2c08">win</a>[FSI_Free_Count], fs-><a class="code" href="struct__FATFS.html#a8360b3d9614f1bdf103e321239d71ff">free_clust</a>);<a name="l00118"></a>00118 ST_DWORD(&fs-><a class="code" href="struct__FATFS.html#32c85fa1d26f37661c21f5a1afaa2c08">win</a>[FSI_Nxt_Free], fs-><a class="code" href="struct__FATFS.html#fefa77a3df67f4de4d858293935781c0">last_clust</a>);<a name="l00119"></a>00119 <a class="code" href="mmc_8c.html#0045ef2f87f7c45d77bcdef38eae7b67">disk_write</a>(0, fs-><a class="code" href="struct__FATFS.html#32c85fa1d26f37661c21f5a1afaa2c08">win</a>, fs->fsi_sector, 1);<a name="l00120"></a>00120 fs->fsi_flag = 0;<a name="l00121"></a>00121 }<a name="l00122"></a>00122 <span class="preprocessor">#endif</span><a name="l00123"></a>00123 <span class="preprocessor"></span> <span class="keywordflow">if</span> (<a class="code" href="mmc_8c.html#e342f09a55603a5053750e2fd040f4a8">disk_ioctl</a>(0, CTRL_SYNC, NULL) != RES_OK) <span class="keywordflow">return</span> FR_RW_ERROR;<a name="l00124"></a>00124 <span class="keywordflow">return</span> FR_OK;<a name="l00125"></a>00125 }<a name="l00126"></a>00126 <span class="preprocessor">#endif</span><a name="l00127"></a>00127 <span class="preprocessor"></span><a name="l00128"></a>00128 <a name="l00129"></a>00129 <a name="l00130"></a>00130 <a name="l00131"></a>00131 <span class="comment">/*-----------------------------------------------------------------------*/</span><a name="l00132"></a>00132 <span class="comment">/* Get a cluster status */</span><a name="l00133"></a>00133 <span class="comment">/*-----------------------------------------------------------------------*/</span><a name="l00134"></a>00134 <a name="l00135"></a>00135 <span class="keyword">static</span><a name="l00136"></a>00136 CLUST get_cluster ( <span class="comment">/* 0,>=2: successful, 1: failed */</span><a name="l00137"></a>00137 CLUST clust <span class="comment">/* Cluster# to get the link information */</span><a name="l00138"></a>00138 )<a name="l00139"></a>00139 {<a name="l00140"></a>00140 WORD wc, bc;<a name="l00141"></a>00141 DWORD fatsect;<a name="l00142"></a>00142 <a class="code" href="struct__FATFS.html">FATFS</a> *fs = FatFs;<a name="l00143"></a>00143 <a name="l00144"></a>00144 <a name="l00145"></a>00145 <span class="keywordflow">if</span> (clust >= 2 && clust < fs->max_clust) { <span class="comment">/* Valid cluster# */</span><a name="l00146"></a>00146 fatsect = fs-><a class="code" href="struct__FATFS.html#08708ab393918e5bfdbf2be9492a6094">fatbase</a>;<a name="l00147"></a>00147 <span class="keywordflow">switch</span> (fs-><a class="code" href="struct__FATFS.html#91bea3661c2ffe4f65143c163493b995">fs_type</a>) {<a name="l00148"></a>00148 <span class="keywordflow">case</span> FS_FAT12 :<a name="l00149"></a>00149 bc = (WORD)clust * 3 / 2;<a name="l00150"></a>00150 <span class="keywordflow">if</span> (!move_window(fatsect + bc / 512)) <span class="keywordflow">break</span>;<a name="l00151"></a>00151 wc = fs-><a class="code" href="struct__FATFS.html#32c85fa1d26f37661c21f5a1afaa2c08">win</a>[bc % 512]; bc++;<a name="l00152"></a>00152 <span class="keywordflow">if</span> (!move_window(fatsect + bc / 512)) <span class="keywordflow">break</span>;<a name="l00153"></a>00153 wc |= (WORD)fs-><a class="code" href="struct__FATFS.html#32c85fa1d26f37661c21f5a1afaa2c08">win</a>[bc % 512] << 8;<a name="l00154"></a>00154 return (clust & 1) ? (wc >> 4) : (wc & 0xFFF);<a name="l00155"></a>00155 <a name="l00156"></a>00156 <span class="keywordflow">case</span> FS_FAT16 :<a name="l00157"></a>00157 <span class="keywordflow">if</span> (!move_window(fatsect + clust / 256)) <span class="keywordflow">break</span>;<a name="l00158"></a>00158 <span class="keywordflow">return</span> LD_WORD(&fs-><a class="code" href="struct__FATFS.html#32c85fa1d26f37661c21f5a1afaa2c08">win</a>[((WORD)clust * 2) % 512]);<a name="l00159"></a>00159 <span class="preprocessor">#if _FAT32</span><a name="l00160"></a>00160 <span class="preprocessor"></span> <span class="keywordflow">case</span> FS_FAT32 :<a name="l00161"></a>00161 <span class="keywordflow">if</span> (!move_window(fatsect + clust / 128)) <span class="keywordflow">break</span>;<a name="l00162"></a>00162 <span class="keywordflow">return</span> LD_DWORD(&fs-><a class="code" href="struct__FATFS.html#32c85fa1d26f37661c21f5a1afaa2c08">win</a>[((WORD)clust * 4) % 512]) & 0x0FFFFFFF;<a name="l00163"></a>00163 <span class="preprocessor">#endif</span><a name="l00164"></a>00164 <span class="preprocessor"></span> }<a name="l00165"></a>00165 }<a name="l00166"></a>00166 <a name="l00167"></a>00167 <span class="keywordflow">return</span> 1; <span class="comment">/* There is no cluster information, or an error occured */</span><a name="l00168"></a>00168 }<a name="l00169"></a>00169 <a name="l00170"></a>00170 <a name="l00171"></a>00171 <a name="l00172"></a>00172 <a name="l00173"></a>00173 <span class="comment">/*-----------------------------------------------------------------------*/</span><a name="l00174"></a>00174 <span class="comment">/* Change a cluster status */</span><a name="l00175"></a>00175 <span class="comment">/*-----------------------------------------------------------------------*/</span><a name="l00176"></a>00176 <a name="l00177"></a>00177 <span class="preprocessor">#if !_FS_READONLY</span><a name="l00178"></a>00178 <span class="preprocessor"></span><span class="keyword">static</span><a name="l00179"></a>00179 BOOL put_cluster ( <span class="comment">/* TRUE: successful, FALSE: failed */</span><a name="l00180"></a>00180 CLUST clust, <span class="comment">/* Cluster# to change */</span><a name="l00181"></a>00181 CLUST val <span class="comment">/* New value to mark the cluster */</span><a name="l00182"></a>00182 )<a name="l00183"></a>00183 {<a name="l00184"></a>00184 WORD bc;<a name="l00185"></a>00185 BYTE *p;<a name="l00186"></a>00186 DWORD fatsect;<a name="l00187"></a>00187 <a class="code" href="struct__FATFS.html">FATFS</a> *fs = FatFs;<a name="l00188"></a>00188 <a name="l00189"></a>00189 <a name="l00190"></a>00190 fatsect = fs-><a class="code" href="struct__FATFS.html#08708ab393918e5bfdbf2be9492a6094">fatbase</a>;<a name="l00191"></a>00191 <span class="keywordflow">switch</span> (fs-><a class="code" href="struct__FATFS.html#91bea3661c2ffe4f65143c163493b995">fs_type</a>) {<a name="l00192"></a>00192 <span class="keywordflow">case</span> FS_FAT12 :<a name="l00193"></a>00193 bc = (WORD)clust * 3 / 2;<a name="l00194"></a>00194 <span class="keywordflow">if</span> (!move_window(fatsect + bc / 512)) <span class="keywordflow">return</span> <a class="code" href="common_8h.html#a93f0eb578d23995850d61f7d61c55c1">FALSE</a>;<a name="l00195"></a>00195 p = &fs-><a class="code" href="struct__FATFS.html#32c85fa1d26f37661c21f5a1afaa2c08">win</a>[bc % 512];<a name="l00196"></a>00196 *p = (clust & 1) ? ((*p & 0x0F) | ((BYTE)val << 4)) : (BYTE)val;<a name="l00197"></a>00197 bc++;<a name="l00198"></a>00198 fs-><a class="code" href="struct__FATFS.html#14c3cb7044924714bf3c7cc19b7da45e">winflag</a> = 1; <a name="l00199"></a>00199 <span class="keywordflow">if</span> (!move_window(fatsect + bc / 512)) <span class="keywordflow">return</span> <a class="code" href="common_8h.html#a93f0eb578d23995850d61f7d61c55c1">FALSE</a>;<a name="l00200"></a>00200 p = &fs-><a class="code" href="struct__FATFS.html#32c85fa1d26f37661c21f5a1afaa2c08">win</a>[bc % 512];<a name="l00201"></a>00201 *p = (clust & 1) ? (BYTE)(val >> 4) : ((*p & 0xF0) | ((BYTE)(val >> 8) & 0x0F));<a name="l00202"></a>00202 <span class="keywordflow">break</span>;<a name="l00203"></a>00203 <a name="l00204"></a>00204 <span class="keywordflow">case</span> FS_FAT16 :<a name="l00205"></a>00205 <span class="keywordflow">if</span> (!move_window(fatsect + clust / 256)) <span class="keywordflow">return</span> <a class="code" href="common_8h.html#a93f0eb578d23995850d61f7d61c55c1">FALSE</a>;<a name="l00206"></a>00206 ST_WORD(&fs-><a class="code" href="struct__FATFS.html#32c85fa1d26f37661c21f5a1afaa2c08">win</a>[((WORD)clust * 2) % 512], (WORD)val);<a name="l00207"></a>00207 <span class="keywordflow">break</span>;<a name="l00208"></a>00208 <span class="preprocessor">#if _FAT32</span><a name="l00209"></a>00209 <span class="preprocessor"></span> <span class="keywordflow">case</span> FS_FAT32 :<a name="l00210"></a>00210 <span class="keywordflow">if</span> (!move_window(fatsect + clust / 128)) <span class="keywordflow">return</span> <a class="code" href="common_8h.html#a93f0eb578d23995850d61f7d61c55c1">FALSE</a>;<a name="l00211"></a>00211 ST_DWORD(&fs-><a class="code" href="struct__FATFS.html#32c85fa1d26f37661c21f5a1afaa2c08">win</a>[((WORD)clust * 4) % 512], val);<a name="l00212"></a>00212 <span class="keywordflow">break</span>;<a name="l00213"></a>00213 <span class="preprocessor">#endif</span><a name="l00214"></a>00214 <span class="preprocessor"></span> <span class="keywordflow">default</span> :<a name="l00215"></a>00215 <span class="keywordflow">return</span> <a class="code" href="common_8h.html#a93f0eb578d23995850d61f7d61c55c1">FALSE</a>;<a name="l00216"></a>00216 }<a name="l00217"></a>00217 fs-><a class="code" href="struct__FATFS.html#14c3cb7044924714bf3c7cc19b7da45e">winflag</a> = 1;<a name="l00218"></a>00218 <span class="keywordflow">return</span> <a class="code" href="common_8h.html#a8cecfc5c5c054d2875c03e77b7be15d">TRUE</a>;<a name="l00219"></a>00219 }<a name="l00220"></a>00220 <span class="preprocessor">#endif </span><span class="comment">/* !_FS_READONLY */</span><a name="l00221"></a>00221 <a name="l00222"></a>00222 <a name="l00223"></a>00223 <a name="l00224"></a>00224 <a name="l00225"></a>00225 <span class="comment">/*-----------------------------------------------------------------------*/</span><a name="l00226"></a>00226 <span class="comment">/* Remove a cluster chain */</span>⌨️ 快捷键说明
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