mmc_8c.html

MP3播放器源代码, VS1003B

00198   <span class="comment">//mediaSerialNumber[1] = diskSect.raw.buf[11];</span>
00199   <span class="comment">//mediaSerialNumber[2] = diskSect.raw.buf[12];</span>
00200   <span class="comment">//mediaSerialNumber[3] = diskSect.raw.buf[13];</span>
00201 
00202   ConsolePutChar(<span class="charliteral">'\r'</span>);
00203   
00204   <span class="comment">/* print out card ident register</span>
00205 <span class="comment">  for (c=0; c&lt;30; c++){</span>
00206 <span class="comment">    if ((c&amp;0x03)==0) ConsolePutChar(' ');</span>
00207 <span class="comment">    ConsolePutHex8(diskSect.raw.buf[c]);</span>
00208 <span class="comment">  }</span>
00209 <span class="comment">  */</span>
00210 
00211   <span class="keywordflow">return</span> 0; <span class="comment">/* All OK return */</span>
00212 }
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<a class="anchor" name="a5" doxytag="mmc.c::InitMMC" ></a><p>
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          <td class="md" nowrap valign="top"> Public unsigned char InitMMC           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
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<p>
Start-up the MMC card. 
<p>
<ul>
<li>Returns 0 when successful and supports seek-before-read</li><li>Returns 0x0e when successful but no support for seek-before-read</li><li>Returns 1 when MMC card is not found</li><li>Returns 2 when MMC card seems to be present but can't be read from. </li></ul>

<p>
Definition at line <a class="el" href="mmc_8c-source.html#l00246">246</a> of file <a class="el" href="mmc_8c-source.html">mmc.c</a>.
<p>
References <a class="el" href="buffer_8h-source.html#l00107">DiskBlock::Raw::buf</a>, <a class="el" href="board_8c-source.html#l00036">Delay()</a>, <a class="el" href="buffer_8c-source.html#l00010">diskSect</a>, <a class="el" href="mmc_8c-source.html#l00171">GetStorageInformation()</a>, <a class="el" href="board_8h-source.html#l00254">Temp::i</a>, <a class="el" href="board_8h-source.html#l00162">MMC_OFF</a>, <a class="el" href="mmc_8c-source.html#l00019">MmcCommand()</a>, <a class="el" href="board_8h-source.html#l00178">MMCDeselect</a>, <a class="el" href="board_8h-source.html#l00175">MMCSelect</a>, <a class="el" href="board_8h-source.html#l00159">NO</a>, <a class="el" href="board_8h-source.html#l00280">Public</a>, <a class="el" href="unionDiskBlock.html#o1">DiskBlock::raw</a>, <a class="el" href="mmc_8c-source.html#l00463">ReadPhysicalSector()</a>, <a class="el" href="mmc_8c-source.html#l00217">RebootMMC()</a>, <a class="el" href="mmc_8c-source.html#l00431">SeekSector()</a>, <a class="el" href="board_8h-source.html#l00235">SPIPutChar</a>, <a class="el" href="board_8h-source.html#l00238">SPIPutCharWithoutWaiting</a>, <a class="el" href="board_8h-source.html#l00232">SPIWait</a>, <a class="el" href="board_8c.html#a0">temp</a>, and <a class="el" href="board_8h-source.html#l00156">YES</a>.
<p>
Referenced by <a class="el" href="storage_8c-source.html#l00043">InitStorage()</a>, and <a class="el" href="filesys_8c-source.html#l00610">OpenFile()</a>.
<p>
<pre class="fragment"><div>00246                               {
00247   <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> c;
00248 
00249   <span class="comment">//Switch off the MMC power supply</span>
00250   <a class="code" href="board_8h.html#a28">MMC_OFF</a> = <a class="code" href="board_8h.html#a26">YES</a>; 
00251 
00252   ConsoleWrite (<span class="stringliteral">"Init: MMC\r"</span>);
00253   <a class="code" href="board_8h.html#a51">Delay</a>(100);
00254 
00255   <span class="comment">//Switch on the MMC power supply</span>
00256   <a class="code" href="board_8h.html#a28">MMC_OFF</a> = <a class="code" href="board_8h.html#a27">NO</a>;
00257   <a class="code" href="board_8h.html#a51">Delay</a>(100);
00258 
00259   <a class="code" href="board_8h.html#a32">MMCSelect</a>();
00260   <span class="comment">/* Allow MMC some time and clock cycles to reset */</span>
00261   <span class="keywordflow">for</span> (c=0; c&lt;200; c++){    
00262     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00263     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00264   }
00265   <a class="code" href="board_8h.html#a51">Delay</a>(20);
00266 
00267   <span class="keywordflow">if</span> (<a class="code" href="mmc_8c.html#a4">RebootMMC</a>()) <span class="keywordflow">return</span> 1; <span class="comment">//not able to powerup;</span>
00268   <span class="comment">//An existing MMC card should be able to respond now.</span>
00269 
00270   <a class="code" href="mmc_8c.html#a3">GetStorageInformation</a>();
00271   
00272   <span class="comment">/* Set Block Size of 512 bytes (2 == 512 &lt;&lt; 8) */</span>
00273   <span class="keywordflow">if</span> ((c=<a class="code" href="mmc_8c.html#a0">MmcCommand</a>(0x50,0,0,2,0))) <span class="keywordflow">return</span> c|0x80; <span class="comment">/* blocksize error */</span>
00274   
00275   <span class="comment">/* Check if MMC supports interrupted data transfer */</span>
00276   <span class="comment">/* This does a simple checksum check to see if interrupted and </span>
00277 <span class="comment">   * non-interrupted read blocks are the same. */</span>
00278   <span class="comment">/* This could be a function, so it is in braces for clarity purposes */</span>
00279   {  
00280     <span class="keywordflow">if</span> (<a class="code" href="mmc_8h.html#a2">SeekSector</a>(0)) <span class="keywordflow">return</span> 2; <span class="comment">//Storage powerup failure    </span>
00281     <span class="keywordflow">if</span> (<a class="code" href="mmc_8c.html#a9">ReadPhysicalSector</a>()) <span class="keywordflow">return</span> 2; <span class="comment">//Storage powerup failure</span>
00282 
00283     <a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o1">i</a> = <a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o1">raw</a>.<a class="code" href="structDiskBlock_1_1Raw.html#o0">buf</a>[511];
00284     <span class="keywordflow">for</span> (c=0; c&lt;250; c++){
00285       <a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o1">i</a> += <a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o1">raw</a>.<a class="code" href="structDiskBlock_1_1Raw.html#o0">buf</a>[c];
00286     }
00287     
00288     <span class="keywordflow">if</span> (<a class="code" href="mmc_8h.html#a2">SeekSector</a>(0)) <span class="keywordflow">return</span> 2;<span class="comment">//Storage powerup failure</span>
00289     
00290     <span class="comment">/* Send some extra SPI clocks */</span>
00291     <a class="code" href="board_8h.html#a33">MMCDeselect</a>();
00292     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00293     <span class="keywordflow">for</span> (c=0; c&lt;100; c++){
00294       <a class="code" href="board_8h.html#a44">SPIPutChar</a>(0xff);
00295     }
00296     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00297     
00298     <span class="keywordflow">if</span> (<a class="code" href="mmc_8c.html#a9">ReadPhysicalSector</a>()){
00299       ConsoleWrite(<span class="stringliteral">"Interrupted read failed.\r"</span>);
00300       ConsoleWrite(<span class="stringliteral">"Using compatibility mode.\r"</span>);
00301       <span class="keywordflow">return</span> 0x0e; <span class="comment">//ok but no support for seek-before-read</span>
00302       
00303     }<span class="keywordflow">else</span>{
00304       <span class="comment">//Check if received data was same</span>
00305       <a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o1">i</a> -= <a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o1">raw</a>.<a class="code" href="structDiskBlock_1_1Raw.html#o0">buf</a>[511];
00306       <span class="keywordflow">for</span> (c=0; c&lt;250; c++){
00307         <a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o1">i</a> -= <a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o1">raw</a>.<a class="code" href="structDiskBlock_1_1Raw.html#o0">buf</a>[c];
00308       }
00309     }
00310     
00311     <span class="keywordflow">if</span> (<a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o1">i</a>) { <span class="comment">/* Checksum does not match */</span>
00312       ConsoleWrite(<span class="stringliteral">"This MMC has no support for interrupted read. "</span>);
00313       ConsoleWrite(<span class="stringliteral">"Using compatibility mode.\r"</span>);
00314       <span class="keywordflow">return</span> 0x0e; <span class="comment">//ok but no support for seek-before-read</span>
00315     }
00316     
00317     ConsoleWrite(<span class="stringliteral">"\rInitMMC ok.\r"</span>);
00318   }
00319 
00320   <span class="comment">/* All OK return */</span>
00321   <span class="keywordflow">return</span> 0; <span class="comment">//ok and MMC supports seek-before-read</span>
00322 
00323 }
</div></pre>
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<a class="anchor" name="a0" doxytag="mmc.c::MmcCommand" ></a><p>
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          <td class="md" nowrap valign="top"> unsigned char MmcCommand           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">unsigned char&nbsp;</td>
          <td class="mdname" nowrap> <em>c1</em>, </td>
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          <td class="md" nowrap align="right"></td>
          <td></td>
          <td class="md" nowrap>unsigned char&nbsp;</td>
          <td class="mdname" nowrap> <em>c2</em>, </td>
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          <td class="md" nowrap align="right"></td>
          <td></td>
          <td class="md" nowrap>unsigned char&nbsp;</td>
          <td class="mdname" nowrap> <em>c3</em>, </td>
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          <td class="md" nowrap align="right"></td>
          <td></td>
          <td class="md" nowrap>unsigned char&nbsp;</td>
          <td class="mdname" nowrap> <em>c4</em>, </td>
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          <td class="md" nowrap align="right"></td>
          <td></td>
          <td class="md" nowrap>unsigned char&nbsp;</td>
          <td class="mdname" nowrap> <em>c5</em></td>
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          <td></td>
          <td class="md">)&nbsp;</td>
          <td class="md" colspan="2"></td>
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