mmc_8h.html

MP3播放器源代码, VS1003B

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 }
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<a class="anchor" name="a3" doxytag="mmc.h::ReadPhysicalSector" ></a><p>
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          <td class="md" nowrap valign="top"> 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>
          <td class="md" nowrap></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 }
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<a class="anchor" name="a2" doxytag="mmc.h::SeekSector" ></a><p>
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          <td class="md" nowrap valign="top"> unsigned char SeekSector           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">unsigned long&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>sectorN</em>          </td>
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<p>
Perform MMC Seek Command for offset sectorN*512. 
<p>
In English: Send the Read Sector command to MMC 
<p>
Definition at line <a class="el" href="mmc_8c-source.html#l00431">431</a> of file <a class="el" href="mmc_8c-source.html">mmc.c</a>.
<p>
References <a class="el" href="unionAddress.html#o1">Address::b</a>, <a class="el" href="buffer_8h-source.html#l00131">Address::B::b0</a>, <a class="el" href="buffer_8h-source.html#l00132">Address::B::b1</a>, <a class="el" href="buffer_8h-source.html#l00133">Address::B::b2</a>, <a class="el" href="mmc_8c-source.html#l00397">ConsoleDecipherMMCResponse()</a>, <a class="el" href="buffer_8h-source.html#l00129">Address::l</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#l00280">Public</a>, <a class="el" href="mmc_8c-source.html#l00217">RebootMMC()</a>, and <a class="el" href="buffer_8c-source.html#l00015">sectorAddress</a>.
<p>
Referenced by <a class="el" href="mmc_8c-source.html#l00246">InitMMC()</a>, <a class="el" href="storage_8c-source.html#l00071">PrepareToReadDiskSector()</a>, and <a class="el" href="storage_8c-source.html#l00110">ReadDiskSector()</a>.
<p>
<pre class="fragment"><div>00431                                                       {
00432   <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> c, retries;
00433 
00434   retries = 0;
00435   <span class="keywordflow">do</span>{
00436     retries++;
00437     <a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o0">l</a> = sectorN * 2; <span class="comment">//convert to bytes (combined with 8bit shift)</span>
00438     c=<a class="code" href="mmc_8c.html#a0">MmcCommand</a>(0x51,<a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o1">b</a>.<a class="code" href="structAddress_1_1B.html#o2">b2</a>,<a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o1">b</a>.<a class="code" href="structAddress_1_1B.html#o1">b1</a>,
00439                  <a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o1">b</a>.<a class="code" href="structAddress_1_1B.html#o0">b0</a>, 0);
00440     <a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o0">l</a> = <a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o0">l</a> &gt;&gt; 1; <span class="comment">//convert back to blocks</span>
00441 
00442     <span class="comment">// If MMC works properly, it returns Busy (== Not idle) at this stage.    </span>
00443     <span class="keywordflow">if</span> (c!=0x00){
00444       <span class="keywordflow">if</span> (c != 0xff){ 
00445         <span class="comment">//MMC returns something else than Busy or "Idle Bus", print what it is</span>
00446         <a class="code" href="mmc_8c.html#a7">ConsoleDecipherMMCResponse</a>(c);
00447       }
00448       <span class="comment">// Something is wrong, take the standard action...</span>
00449       <a class="code" href="mmc_8c.html#a4">RebootMMC</a>();
00450       <span class="keywordflow">if</span> (retries &gt; 10){  
00451         <span class="keywordflow">return</span> 7; <span class="comment">/* failed to execute mmc command */</span>
00452       }
00453     }
00454   }<span class="keywordflow">while</span>(c!=0x00); <span class="comment">//repeat until we get busy signal from MMC.</span>
00455     
00456   <a class="code" href="board_8h.html#a33">MMCDeselect</a>();
00457   
00458   <span class="keywordflow">return</span> 0; <span class="comment">//ok return</span>
00459 }
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