mmc_8c.html

MP3播放器源代码, VS1003B

00127     <span class="comment">// Flush any data that might be pending from the MMC.</span>
00128 <span class="preprocessor">#ifdef MMCLONGDEBUG    </span>
00129 <span class="preprocessor"></span>    {
00130       <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;
00131       ConsoleWrite(<span class="stringliteral">"\rMMCWaitForData failed. "</span>);
00132       ConsoleWrite(<span class="stringliteral">"Expected 0xFE token, received: "</span>);
00133       <span class="keywordflow">for</span> (i=0;i&lt;550;i++){
00134         ConsolePutHex8(c);
00135         c=<a class="code" href="board_8c.html#a1">SPIGetChar</a>();
00136       }
00137     }
00138 <span class="preprocessor">#else</span>
00139 <span class="preprocessor"></span>    ConsoleWrite(<span class="stringliteral">" NoData "</span>);
00140     <a class="code" href="board_8h.html#a50">SPI8Clocks</a>(200); <span class="comment">/* Flush MMC by sending lots of FF's to it */</span>
00141     <a class="code" href="board_8h.html#a50">SPI8Clocks</a>(200);
00142     <a class="code" href="board_8h.html#a50">SPI8Clocks</a>(200);
00143 <span class="preprocessor">#endif</span>
00144 <span class="preprocessor"></span>
00145     <a class="code" href="board_8h.html#a33">MMCDeselect</a>();
00146     DebugMessage(<span class="stringliteral">"!t&gt;"</span>);
00147     <span class="keywordflow">return</span> 5; <span class="comment">//Return error</span>
00148   }
00149   DebugMessage(<span class="stringliteral">"t&gt;"</span>); <span class="comment">//Exit Token Wait</span>
00150   <span class="keywordflow">return</span> 0;
00151 }
</div></pre>
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<a class="anchor" name="a6" doxytag="mmc.c::PerformBlockRead" ></a><p>
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          <td class="md" nowrap valign="top"> void PerformBlockRead           </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>
Perform the actual reading of 512 octets from MMC. 
<p>
Note: This is the fast routine to read complete disk block If you have DMA, write this to use it! 
<p>
Definition at line <a class="el" href="mmc_8c-source.html#l00330">330</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="buffer_8c-source.html#l00013">dataBufPtr</a>, <a class="el" href="buffer_8c-source.html#l00010">diskSect</a>, <a class="el" href="unionDiskBlock.html#o1">DiskBlock::raw</a>, <a class="el" href="board_8h-source.html#l00241">SPI_RESULT_BYTE</a>, <a class="el" href="board_8h-source.html#l00238">SPIPutCharWithoutWaiting</a>, and <a class="el" href="board_8h-source.html#l00232">SPIWait</a>.
<p>
Referenced by <a class="el" href="mmc_8c-source.html#l00463">ReadPhysicalSector()</a>.
<p>
<pre class="fragment"><div>00330                        {
00331 
00332 <span class="preprocessor">#ifdef MMCDEBUG</span>
00333 <span class="preprocessor"></span>  ConsoleWrite(<span class="stringliteral">"&lt;R"</span>); <span class="comment">//Actual Read</span>
00334 <span class="preprocessor">#endif</span>
00335 <span class="preprocessor"></span>
00336   <span class="comment">/* Use shared global buffer pointer for speed*/</span>
00337   <span class="comment">/* Loop unrolled 16 times for SPEED! :) */</span>
00338   <a class="code" href="buffer_8c.html#a1">dataBufPtr</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>;
00339   <span class="keywordflow">while</span> (<a class="code" href="buffer_8c.html#a1">dataBufPtr</a> &lt; <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>+512){
00340     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00341     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00342     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00343     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00344     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00345     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00346     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00347     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00348     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00349     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00350     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00351     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00352     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00353     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00354     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00355     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00356     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00357     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00358     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00359     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00360     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00361     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00362     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00363     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00364     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00365     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00366     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00367     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00368     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00369     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00370     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00371     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00372     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00373     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00374     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00375     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00376     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00377     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00378     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00379     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00380     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00381     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00382     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00383     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00384     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00385     <a class="code" href="board_8h.html#a45">SPIPutCharWithoutWaiting</a>(0xff);
00386     <a class="code" href="board_8h.html#a43">SPIWait</a>();
00387     *<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++=<a class="code" href="board_8h.html#a46">SPI_RESULT_BYTE</a>;
00388   }
00389 
00390 <span class="preprocessor">#ifdef MMCDEBUG</span>
00391 <span class="preprocessor"></span>    ConsoleWrite(<span class="stringliteral">"R&gt;"</span>);
00392 <span class="preprocessor">#endif</span>
00393 <span class="preprocessor"></span>
00394 }
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<a class="anchor" name="a9" doxytag="mmc.c::ReadPhysicalSector" ></a><p>
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          <td class="md" nowrap valign="top"> Public unsigned char ReadPhysicalSector           </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>
Perform block read of previously sought sector to diskSect. 
<p>

<p>
Definition at line <a class="el" href="mmc_8c-source.html#l00463">463</a> of file <a class="el" href="mmc_8c-source.html">mmc.c</a>.
<p>
References <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="mmc_8c-source.html#l00105">MmcWaitForData()</a>, <a class="el" href="mmc_8c-source.html#l00330">PerformBlockRead()</a>, <a class="el" href="board_8h-source.html#l00280">Public</a>, and <a class="el" href="board_8c-source.html#l00026">SPI8Clocks()</a>.
<p>
Referenced by <a class="el" href="mmc_8c-source.html#l00246">InitMMC()</a>, and <a class="el" href="storage_8c-source.html#l00110">ReadDiskSector()</a>.
<p>
<pre class="fragment"><div>00463                                          {
00464 
00465   <span class="comment">// RED_LED = LED_ON; /* Disk Read LED on */</span>
00466 
00467   <a class="code" href="board_8h.html#a32">MMCSelect</a>();
00468   <a class="code" href="mmc_8c.html#a1">MmcWaitForData</a>();
00469   <a class="code" href="mmc_8c.html#a6">PerformBlockRead</a>();
00470 
00471   <span class="comment">/* generate SPI clock edges to finish up the command */</span>
00472 
00473   <a class="code" href="board_8h.html#a50">SPI8Clocks</a>(4); <span class="comment">//Send 8*4=32 clocks (4 ff's) to MMC to be nice.</span>
00474   <a class="code" href="board_8h.html#a33">MMCDeselect</a>();
00475   <a class="code" href="board_8h.html#a50">SPI8Clocks</a>(4); <span class="comment">//Again, give the poor MMC some clocks, it likes them.</span>
00476 
00477   <span class="comment">//RED_LED = LED_OFF; /* Disk Read LED off */</span>
00478 
00479   <span class="keywordflow">return</span> 0; <span class="comment">//ok return</span>
00480 }
</div></pre>
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<a class="anchor" name="a4" doxytag="mmc.c::RebootMMC" ></a><p>
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